Page 239 - Diodes - Zener - Single | Discrete Semiconductor Products

ZMM5241B-13
Vishay Semiconductor Diodes Division

DIODE ZENER SOD80 MINIMELF

Package: DO-213AC, MINI-MELF, SOD-80

Stock2,816
JANTX1N4485CUS
Microsemi Corporation

DIODE ZENER 68V 1.5W D5A

Package: SQ-MELF, A

Stock3,920
1N6012B_T50A
Fairchild/ON Semiconductor

DIODE ZENER 33V 500MW DO35

Package: DO-204AH, DO-35, Axial

Stock6,208
BZT52C13-13
Diodes Incorporated

DIODE ZENER 13V 500MW SOD123

Package: SOD-123

Stock2,112
1N5350B
Microsemi Corporation

DIODE ZENER 13V 5W T18

Package: T-18, Axial

Stock420,000
JANTXV1N5541CUR-1
Microsemi Corporation

DIODE ZENER 22V 500MW DO213AA

Package: DO-213AA (Glass)

Stock3,056
JANTX1N4480
Microsemi Corporation

DIODE ZENER 43V 1.5W DO41

Package: DO-204AL, DO-41, Axial

Stock3,360
BZD17C9V1P-E3-18
Vishay Semiconductor Diodes Division

DIODE ZENER 800MW SMF DO219AB

Package: DO-219AB

Stock5,104
2M160Z B0G
Taiwan Semiconductor Corporation

DIODE, ZENER, 160V, 2000MW, %, D

Package: DO-204AC, DO-15, Axial

Stock4,368
NSZ5V6V2T1G
ON Semiconductor

DIODE ZENER 6.2V 200MW SOD523

Package: SC-79, SOD-523

Stock36,000
ZM4734A L0G
Taiwan Semiconductor Corporation

DIODE, ZENER, 5.6V, 1000MW, 5%,

Package: DO-213AB, MELF

Stock3,376
DDZ9694Q-7
Diodes Incorporated

DIODE ZENER SOD123

Package: SOD-123

Stock3,440
BZX585B5V1 RKG
Taiwan Semiconductor Corporation

DIODE, ZENER, 5.1V, 200MW, 2%, S

Package: SC-79, SOD-523

Stock3,584
MMSZ51T1G
ON Semiconductor

DIODE ZENER 51V 500MW SOD123

Package: SOD-123

Stock39,852
BZX79B3V9 A0G
Taiwan Semiconductor Corporation

DIODE, ZENER, 3.9V, 500MW, 2%, D

Package: DO-204AH, DO-35, Axial

Stock3,296
MMS3Z15BGW-AQ
Diotec Semiconductor

IC

Package: -

Request a Quote
MMSZ5261B-TP
Micro Commercial Co

DIODE ZENER 47V 500MW SOD123

Package: -

Request a Quote
HZU11A3LTRF-E
Renesas Electronics Corporation

DIODE ZENER 10.1V 0.15W 1.98%

Package: -

Request a Quote
JANTX1N6344CUS-TR
Microchip Technology

VOLTAGE REGULATOR

Package: -

Request a Quote
BZX384-C3V6-QX
Nexperia USA Inc.

BZX384-C3V6-Q/SOD323/SOD2

Package: -

Request a Quote

Part Number	Manufacturer	Description	Package	Stock	Tolerance	Power - Max	Impedance (Max) (Zzt)	Current - Reverse Leakage @ Vr	Voltage - Forward (Vf) (Max) @ If	Operating Temperature	Mounting Type	Package / Case	Supplier Device Package
ZMM5241B-13	Vishay Semiconductor Diodes Division	DIODE ZENER SOD80 MINIMELF Voltage - Zener (Nom) (Vz): 11V Tolerance: ±5% Power - Max: 500mW Impedance (Max) (Zzt): 22 Ohms Current - Reverse Leakage @ Vr: 2µA @ 8.4V Voltage - Forward (Vf) (Max) @ If: 1.5V @ 200mA Operating Temperature: -65°C ~ 175°C (TJ) Mounting Type: Surface Mount Package / Case: DO-213AC, MINI-MELF, SOD-80 Supplier Device Package: Mini MELF	Package: DO-213AC, MINI-MELF, SOD-80	Stock2,816	±5%	500mW	22 Ohms	2µA @ 8.4V	1.5V @ 200mA	-65°C ~ 175°C (TJ)	Surface Mount	DO-213AC, MINI-MELF, SOD-80	Mini MELF
JANTX1N4485CUS	Microsemi Corporation	DIODE ZENER 68V 1.5W D5A Voltage - Zener (Nom) (Vz): 68V Tolerance: ±2% Power - Max: 1.5W Impedance (Max) (Zzt): 100 Ohms Current - Reverse Leakage @ Vr: 250nA @ 54.4V Voltage - Forward (Vf) (Max) @ If: 1V @ 200mA Operating Temperature: -65°C ~ 175°C Mounting Type: Surface Mount Package / Case: SQ-MELF, A Supplier Device Package: D-5A	Package: SQ-MELF, A	Stock3,920	±2%	1.5W	100 Ohms	250nA @ 54.4V	1V @ 200mA	-65°C ~ 175°C	Surface Mount	SQ-MELF, A	D-5A
1N6012B_T50A	Fairchild/ON Semiconductor	DIODE ZENER 33V 500MW DO35 Voltage - Zener (Nom) (Vz): 33V Tolerance: ±5% Power - Max: 500mW Impedance (Max) (Zzt): 88 Ohms Current - Reverse Leakage @ Vr: 100nA @ 25V Voltage - Forward (Vf) (Max) @ If: 1.2V @ 200mA Operating Temperature: -65°C ~ 200°C Mounting Type: Through Hole Package / Case: DO-204AH, DO-35, Axial Supplier Device Package: DO-35	Package: DO-204AH, DO-35, Axial	Stock6,208	±5%	500mW	88 Ohms	100nA @ 25V	1.2V @ 200mA	-65°C ~ 200°C	Through Hole	DO-204AH, DO-35, Axial	DO-35
BZT52C13-13	Diodes Incorporated	DIODE ZENER 13V 500MW SOD123 Voltage - Zener (Nom) (Vz): 13V Tolerance: ±6% Power - Max: 500mW Impedance (Max) (Zzt): 30 Ohms Current - Reverse Leakage @ Vr: 100nA @ 8V Voltage - Forward (Vf) (Max) @ If: 900mV @ 10mA Operating Temperature: -65°C ~ 150°C Mounting Type: Surface Mount Package / Case: SOD-123 Supplier Device Package: SOD-123	Package: SOD-123	Stock2,112	±6%	500mW	30 Ohms	100nA @ 8V	900mV @ 10mA	-65°C ~ 150°C	Surface Mount	SOD-123	SOD-123
1N5350B	Microsemi Corporation	DIODE ZENER 13V 5W T18 Voltage - Zener (Nom) (Vz): 13V Tolerance: ±5% Power - Max: 5W Impedance (Max) (Zzt): 2.5 Ohms Current - Reverse Leakage @ Vr: 1µA @ 9.4V Voltage - Forward (Vf) (Max) @ If: 1.2V @ 1A Operating Temperature: -65°C ~ 150°C Mounting Type: Through Hole Package / Case: T-18, Axial Supplier Device Package: T-18	Package: T-18, Axial	Stock420,000	±5%	5W	2.5 Ohms	1µA @ 9.4V	1.2V @ 1A	-65°C ~ 150°C	Through Hole	T-18, Axial	T-18
JANTXV1N5541CUR-1	Microsemi Corporation	DIODE ZENER 22V 500MW DO213AA Voltage - Zener (Nom) (Vz): 22V Tolerance: ±2% Power - Max: 500mW Impedance (Max) (Zzt): 100 Ohms Current - Reverse Leakage @ Vr: 10nA @ 19.8V Voltage - Forward (Vf) (Max) @ If: 1.1V @ 200mA Operating Temperature: -65°C ~ 175°C Mounting Type: Surface Mount Package / Case: DO-213AA (Glass) Supplier Device Package: DO-213AA	Package: DO-213AA (Glass)	Stock3,056	±2%	500mW	100 Ohms	10nA @ 19.8V	1.1V @ 200mA	-65°C ~ 175°C	Surface Mount	DO-213AA (Glass)	DO-213AA
JANTX1N4480	Microsemi Corporation	DIODE ZENER 43V 1.5W DO41 Voltage - Zener (Nom) (Vz): 43V Tolerance: ±5% Power - Max: 1.5W Impedance (Max) (Zzt): 40 Ohms Current - Reverse Leakage @ Vr: 50nA @ 34.4V Voltage - Forward (Vf) (Max) @ If: 1V @ 200mA Operating Temperature: -65°C ~ 175°C Mounting Type: Through Hole Package / Case: DO-204AL, DO-41, Axial Supplier Device Package: DO-41	Package: DO-204AL, DO-41, Axial	Stock3,360	±5%	1.5W	40 Ohms	50nA @ 34.4V	1V @ 200mA	-65°C ~ 175°C	Through Hole	DO-204AL, DO-41, Axial	DO-41
BZD17C9V1P-E3-18	Vishay Semiconductor Diodes Division	DIODE ZENER 800MW SMF DO219AB Voltage - Zener (Nom) (Vz): 9.1V Tolerance: - Power - Max: 800mW Impedance (Max) (Zzt): - Current - Reverse Leakage @ Vr: 10µA @ 5V Voltage - Forward (Vf) (Max) @ If: 1.2V @ 200mA Operating Temperature: -55°C ~ 150°C Mounting Type: Surface Mount Package / Case: DO-219AB Supplier Device Package: DO-219AB (SMF)	Package: DO-219AB	Stock5,104	-	800mW	-	10µA @ 5V	1.2V @ 200mA	-55°C ~ 150°C	Surface Mount	DO-219AB	DO-219AB (SMF)
2M160Z B0G	Taiwan Semiconductor Corporation	DIODE, ZENER, 160V, 2000MW, %, D Voltage - Zener (Nom) (Vz): 160V Tolerance: ±5% Power - Max: 2W Impedance (Max) (Zzt): 650 Ohms Current - Reverse Leakage @ Vr: 500nA @ 121.6V Voltage - Forward (Vf) (Max) @ If: - Operating Temperature: -55°C ~ 175°C (TJ) Mounting Type: Through Hole Package / Case: DO-204AC, DO-15, Axial Supplier Device Package: DO-204AC (DO-15)	Package: DO-204AC, DO-15, Axial	Stock4,368	±5%	2W	650 Ohms	500nA @ 121.6V	-	-55°C ~ 175°C (TJ)	Through Hole	DO-204AC, DO-15, Axial	DO-204AC (DO-15)
NSZ5V6V2T1G	ON Semiconductor	DIODE ZENER 6.2V 200MW SOD523 Voltage - Zener (Nom) (Vz): 6.2V Tolerance: ±2% Power - Max: 200mW Impedance (Max) (Zzt): 40 Ohms Current - Reverse Leakage @ Vr: 1µA @ 2V Voltage - Forward (Vf) (Max) @ If: 900mV @ 10mA Operating Temperature: -65°C ~ 150°C Mounting Type: Surface Mount Package / Case: SC-79, SOD-523 Supplier Device Package: SOD-523	Package: SC-79, SOD-523	Stock36,000	±2%	200mW	40 Ohms	1µA @ 2V	900mV @ 10mA	-65°C ~ 150°C	Surface Mount	SC-79, SOD-523	SOD-523
ZM4734A L0G	Taiwan Semiconductor Corporation	DIODE, ZENER, 5.6V, 1000MW, 5%, Voltage - Zener (Nom) (Vz): 5.6V Tolerance: ±5% Power - Max: 1W Impedance (Max) (Zzt): 5 Ohms Current - Reverse Leakage @ Vr: 10µA @ 2V Voltage - Forward (Vf) (Max) @ If: - Operating Temperature: 175°C (TJ) Mounting Type: Surface Mount Package / Case: DO-213AB, MELF Supplier Device Package: MELF	Package: DO-213AB, MELF	Stock3,376	±5%	1W	5 Ohms	10µA @ 2V	-	175°C (TJ)	Surface Mount	DO-213AB, MELF	MELF
DDZ9694Q-7	Diodes Incorporated	DIODE ZENER SOD123 Voltage - Zener (Nom) (Vz): 8.2V Tolerance: ±5% Power - Max: 500mW Impedance (Max) (Zzt): - Current - Reverse Leakage @ Vr: 100nA @ 6.2V Voltage - Forward (Vf) (Max) @ If: 900mV @ 10mA Operating Temperature: -65°C ~ 150°C Mounting Type: Surface Mount Package / Case: SOD-123 Supplier Device Package: SOD-123	Package: SOD-123	Stock3,440	±5%	500mW	-	100nA @ 6.2V	900mV @ 10mA	-65°C ~ 150°C	Surface Mount	SOD-123	SOD-123
BZX585B5V1 RKG	Taiwan Semiconductor Corporation	DIODE, ZENER, 5.1V, 200MW, 2%, S Voltage - Zener (Nom) (Vz): 5.1V Tolerance: ±2% Power - Max: 200mW Impedance (Max) (Zzt): 60 Ohms Current - Reverse Leakage @ Vr: 1.8µA @ 2V Voltage - Forward (Vf) (Max) @ If: - Operating Temperature: 150°C (TJ) Mounting Type: Surface Mount Package / Case: SC-79, SOD-523 Supplier Device Package: SOD-523F	Package: SC-79, SOD-523	Stock3,584	±2%	200mW	60 Ohms	1.8µA @ 2V	-	150°C (TJ)	Surface Mount	SC-79, SOD-523	SOD-523F
MMSZ51T1G	ON Semiconductor	DIODE ZENER 51V 500MW SOD123 Voltage - Zener (Nom) (Vz): 51V Tolerance: ±5% Power - Max: 500mW Impedance (Max) (Zzt): 180 Ohms Current - Reverse Leakage @ Vr: 50nA @ 35.7V Voltage - Forward (Vf) (Max) @ If: 900mV @ 10mA Operating Temperature: -55°C ~ 150°C Mounting Type: Surface Mount Package / Case: SOD-123 Supplier Device Package: SOD-123	Package: SOD-123	Stock39,852	±5%	500mW	180 Ohms	50nA @ 35.7V	900mV @ 10mA	-55°C ~ 150°C	Surface Mount	SOD-123	SOD-123
BZX79B3V9 A0G	Taiwan Semiconductor Corporation	DIODE, ZENER, 3.9V, 500MW, 2%, D Voltage - Zener (Nom) (Vz): 3.9V Tolerance: ±2% Power - Max: 500mW Impedance (Max) (Zzt): 90 Ohms Current - Reverse Leakage @ Vr: 1mA @ 10V Voltage - Forward (Vf) (Max) @ If: 1.5V @ 100mA Operating Temperature: -55°C ~ 175°C (TJ) Mounting Type: Through Hole Package / Case: DO-204AH, DO-35, Axial Supplier Device Package: DO-35	Package: DO-204AH, DO-35, Axial	Stock3,296	±2%	500mW	90 Ohms	1mA @ 10V	1.5V @ 100mA	-55°C ~ 175°C (TJ)	Through Hole	DO-204AH, DO-35, Axial	DO-35
MMS3Z15BGW-AQ	Diotec Semiconductor	IC Voltage - Zener (Nom) (Vz): 15 V Tolerance: ±2% Power - Max: 300 mW Impedance (Max) (Zzt): 30 Ohms Current - Reverse Leakage @ Vr: 100 nA @ 10.5 V Voltage - Forward (Vf) (Max) @ If: - Operating Temperature: -50°C ~ 150°C (TJ) Mounting Type: Surface Mount Package / Case: SC-76, SOD-323 Supplier Device Package: SOD-323	Package: -	Request a Quote	±2%	300 mW	30 Ohms	100 nA @ 10.5 V	-	-50°C ~ 150°C (TJ)	Surface Mount	SC-76, SOD-323	SOD-323
MMSZ5261B-TP	Micro Commercial Co	DIODE ZENER 47V 500MW SOD123 Voltage - Zener (Nom) (Vz): 47 V Tolerance: ±5% Power - Max: 500 mW Impedance (Max) (Zzt): 105 Ohms Current - Reverse Leakage @ Vr: 100 nA @ 36 V Voltage - Forward (Vf) (Max) @ If: - Operating Temperature: -55°C ~ 150°C (TA) Mounting Type: Surface Mount Package / Case: SOD-123 Supplier Device Package: SOD-123	Package: -	Request a Quote	±5%	500 mW	105 Ohms	100 nA @ 36 V	-	-55°C ~ 150°C (TA)	Surface Mount	SOD-123	SOD-123
HZU11A3LTRF-E	Renesas Electronics Corporation	DIODE ZENER 10.1V 0.15W 1.98% Voltage - Zener (Nom) (Vz): - Tolerance: - Power - Max: - Impedance (Max) (Zzt): - Current - Reverse Leakage @ Vr: - Voltage - Forward (Vf) (Max) @ If: - Operating Temperature: - Mounting Type: - Package / Case: - Supplier Device Package: -	Package: -	Request a Quote	-	-	-	-	-	-	-	-	-
JANTX1N6344CUS-TR	Microchip Technology	VOLTAGE REGULATOR Voltage - Zener (Nom) (Vz): 68 V Tolerance: ±2% Power - Max: 500 mW Impedance (Max) (Zzt): 155 Ohms Current - Reverse Leakage @ Vr: 50 nA @ 52 V Voltage - Forward (Vf) (Max) @ If: 1.4 V @ 1 A Operating Temperature: -65°C ~ 175°C (TJ) Mounting Type: Surface Mount Package / Case: SQ-MELF, B Supplier Device Package: B, SQ-MELF	Package: -	Request a Quote	±2%	500 mW	155 Ohms	50 nA @ 52 V	1.4 V @ 1 A	-65°C ~ 175°C (TJ)	Surface Mount	SQ-MELF, B	B, SQ-MELF
BZX384-C3V6-QX	Nexperia USA Inc.	BZX384-C3V6-Q/SOD323/SOD2 Voltage - Zener (Nom) (Vz): 3.6 V Tolerance: ±5% Power - Max: 300 mW Impedance (Max) (Zzt): 90 Ohms Current - Reverse Leakage @ Vr: 5 µA @ 1 V Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA Operating Temperature: 150°C (TJ) Mounting Type: Surface Mount Package / Case: SC-76, SOD-323 Supplier Device Package: SOD-323	Package: -	Request a Quote	±5%	300 mW	90 Ohms	5 µA @ 1 V	900 mV @ 10 mA	150°C (TJ)	Surface Mount	SC-76, SOD-323	SOD-323
ZM4751A	Taiwan Semiconductor Corporation	MELF, 1000MW, 5%, SMALL SIGNAL Z Voltage - Zener (Nom) (Vz): 30 V Tolerance: ±5% Power - Max: 1 W Impedance (Max) (Zzt): 40 Ohms Current - Reverse Leakage @ Vr: 5 µA @ 22.8 V Voltage - Forward (Vf) (Max) @ If: - Operating Temperature: -65°C ~ 175°C (TJ) Mounting Type: Surface Mount Package / Case: DO-213AB, MELF Supplier Device Package: MELF	Package: -	Request a Quote	±5%	1 W	40 Ohms	5 µA @ 22.8 V	-	-65°C ~ 175°C (TJ)	Surface Mount	DO-213AB, MELF	MELF
JANTX1N6336US-TR	Microchip Technology	VOLTAGE REGULATOR Voltage - Zener (Nom) (Vz): 33 V Tolerance: ±5% Power - Max: 500 mW Impedance (Max) (Zzt): 40 Ohms Current - Reverse Leakage @ Vr: 50 nA @ 25 V Voltage - Forward (Vf) (Max) @ If: 1.4 V @ 1 A Operating Temperature: -65°C ~ 175°C Mounting Type: Surface Mount Package / Case: SQ-MELF, B Supplier Device Package: B, SQ-MELF	Package: -	Request a Quote	±5%	500 mW	40 Ohms	50 nA @ 25 V	1.4 V @ 1 A	-65°C ~ 175°C	Surface Mount	SQ-MELF, B	B, SQ-MELF
JANS1N6334CUS	Microchip Technology	VOLTAGE REGULATOR Voltage - Zener (Nom) (Vz): 27 V Tolerance: ±2% Power - Max: 500 mW Impedance (Max) (Zzt): 27 Ohms Current - Reverse Leakage @ Vr: 50 nA @ 21 V Voltage - Forward (Vf) (Max) @ If: 1.4 V @ 1 A Operating Temperature: -65°C ~ 175°C (TJ) Mounting Type: Surface Mount Package / Case: SQ-MELF, B Supplier Device Package: B, SQ-MELF	Package: -	Request a Quote	±2%	500 mW	27 Ohms	50 nA @ 21 V	1.4 V @ 1 A	-65°C ~ 175°C (TJ)	Surface Mount	SQ-MELF, B	B, SQ-MELF
BZX884S-B8V2-QYL	Nexperia USA Inc.	BZX884S-B8V2-Q/SOD882BD/XSON2 Voltage - Zener (Nom) (Vz): 8.2 V Tolerance: ±1.95% Power - Max: 365 mW Impedance (Max) (Zzt): 15 Ohms Current - Reverse Leakage @ Vr: 700 nA @ 5 V Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA Operating Temperature: 150°C (TJ) Mounting Type: Surface Mount Package / Case: SOD-882 Supplier Device Package: DFN1006BD-2	Package: -	Stock28,470	±1.95%	365 mW	15 Ohms	700 nA @ 5 V	900 mV @ 10 mA	150°C (TJ)	Surface Mount	SOD-882	DFN1006BD-2
MMBZ5236B_R1_00001	Panjit International Inc.	SURFACE MOUNT SILICON ZENER DIOD Voltage - Zener (Nom) (Vz): 7.5 V Tolerance: ±5% Power - Max: 410 mW Impedance (Max) (Zzt): 6 Ohms Current - Reverse Leakage @ Vr: 3 µA @ 6 V Voltage - Forward (Vf) (Max) @ If: - Operating Temperature: -55°C ~ 150°C (TJ) Mounting Type: Surface Mount Package / Case: TO-236-3, SC-59, SOT-23-3 Supplier Device Package: SOT-23	Package: -	Stock18,000	±5%	410 mW	6 Ohms	3 µA @ 6 V	-	-55°C ~ 150°C (TJ)	Surface Mount	TO-236-3, SC-59, SOT-23-3	SOT-23
BZT52B3V6S-R9G	Taiwan Semiconductor Corporation	SOD-323F, 200MW, 2%, SMALL SIGNA Voltage - Zener (Nom) (Vz): 3.6 V Tolerance: ±2% Power - Max: 200 mW Impedance (Max) (Zzt): 90 Ohms Current - Reverse Leakage @ Vr: 4.5 µA @ 1 V Voltage - Forward (Vf) (Max) @ If: 1 V @ 10 mA Operating Temperature: -65°C ~ 150°C (TJ) Mounting Type: Surface Mount Package / Case: SC-90, SOD-323F Supplier Device Package: SOD-323F	Package: -	Stock30,000	±2%	200 mW	90 Ohms	4.5 µA @ 1 V	1 V @ 10 mA	-65°C ~ 150°C (TJ)	Surface Mount	SC-90, SOD-323F	SOD-323F
M3Z15VC-RRG	Taiwan Semiconductor Corporation	SOD-323F, 200MW, 5%, ZENER DIODE Voltage - Zener (Nom) (Vz): 15 V Tolerance: ±5% Power - Max: 200 mW Impedance (Max) (Zzt): 30 Ohms Current - Reverse Leakage @ Vr: 100 nA @ 11 V Voltage - Forward (Vf) (Max) @ If: - Operating Temperature: -55°C ~ 150°C (TJ) Mounting Type: Surface Mount Package / Case: SC-90, SOD-323F Supplier Device Package: SOD-323F	Package: -	Stock9,000	±5%	200 mW	30 Ohms	100 nA @ 11 V	-	-55°C ~ 150°C (TJ)	Surface Mount	SC-90, SOD-323F	SOD-323F
BZX584C33-TP	Micro Commercial Co	Interface Voltage - Zener (Nom) (Vz): 33 V Tolerance: ±6.06% Power - Max: 150 mW Impedance (Max) (Zzt): 80 Ohms Current - Reverse Leakage @ Vr: 100 nA @ 23.1 V Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA Operating Temperature: -55°C ~ 150°C (TJ) Mounting Type: Surface Mount Package / Case: SC-79, SOD-523 Supplier Device Package: SOD-523	Package: -	Request a Quote	±6.06%	150 mW	80 Ohms	100 nA @ 23.1 V	900 mV @ 10 mA	-55°C ~ 150°C (TJ)	Surface Mount	SC-79, SOD-523	SOD-523