BZX79-B20,113 Equivalent & Substitute Parts

Part Overview

The BZX79-B20,113 is a 20 V, 400 mW Zener diode manufactured by Nexperia USA Inc. in Through Hole ALF2 packaging. This component is classified as Active and is ROHS3 compliant. The part is supplied in Cut Tape (CT) packaging with 2200 pieces currently in stock.

Equivalent and substitute parts are identified when design requirements permit tolerance variations, package changes, or power rating adjustments while maintaining the core electrical function of voltage regulation at 20 V nominal.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	20	V
Tolerance	±2%	—
Power - Max	400	mW
Impedance (Max)	55	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 14 V	—
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	—
Operating Temperature	-65°C ~ 200°C	—
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—
RoHS Status	ROHS3 Compliant	—
Product Status	Active	—

Substitute Part Grouping Explanation

Substitution of the BZX79-B20,113 is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 20 V (exact match required)
Mounting Type: Through Hole (required for PCB compatibility)
Package / Case: DO-204AH, DO-35, or Axial variants (mechanical fit)
RoHS Status: ROHS3 Compliant (regulatory requirement)
Product Status: Active (availability and support)

Secondary Substitution Criteria (allowable variations):

Tolerance: ±2% to ±6% (design-dependent acceptance)
Power - Max: 400 mW to 1.3 W (higher ratings acceptable for thermal margin)
Impedance (Max): 15 to 55 Ohms (circuit-dependent)
Operating Temperature: -55°C to 200°C (application-dependent)
Current - Reverse Leakage: 50 nA to 1 µA (design-dependent)

All substitute parts listed maintain the 20 V nominal Zener voltage, Through Hole mounting, and ROHS3 compliance required for direct functional substitution.

Parameter Comparison

Parameter	BZX79-B20,113	BZX79-B20,143	1N5250B-TAP	BZT03C20-TR	BZX85B20-TAP
Manufacturer	Nexperia USA Inc.	NXP Semiconductors	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor
Voltage - Zener (Nom)	20 V	20 V	20 V	20 V	20 V
Tolerance	±2%	±2%	±5%	±6%	±2%
Power - Max	400 mW	400 mW	500 mW	1.3 W	1.3 W
Impedance (Max)	55 Ohms	55 Ohms	25 Ohms	15 Ohms	24 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 14 V	50 nA @ 14 V	100 nA @ 15 V	1 µA @ 15 V	500 nA @ 15 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	1.1 V @ 200 mA	1.2 V @ 500 mA	Not specified
Operating Temperature	-65°C ~ 200°C	-65°C ~ 200°C	175°C	175°C (TJ)	-55°C ~ 175°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	SOD-57, Axial	DO-204AL, DO-41, Axial
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active
Qualification	—	—	AEC-Q101	—	AEC-Q101

Engineering Selection Recommendations

BZX79-B20,143 (Parametric Equivalent)

This part is manufactured by NXP Semiconductors and is electrically identical to the BZX79-B20,113. It maintains the same 20 V nominal voltage, ±2% tolerance, 400 mW power rating, and operating temperature range of -65°C to 200°C. The primary difference is packaging format (Bulk versus Cut Tape). This part is suitable for direct substitution in applications where packaging format does not impose constraints. Inventory availability is significantly higher at 215,676 pieces.

1N5250B-TAP (Similar Substitute)

This Vishay part maintains the 20 V nominal voltage and Through Hole mounting but increases power rating to 500 mW and tolerance to ±5%. The impedance is reduced to 25 Ohms. Operating temperature is limited to 175°C maximum. This part is AEC-Q101 qualified for automotive applications. Substitution is suitable for designs that tolerate ±5% voltage tolerance and do not require the full -65°C to 200°C temperature range of the original part.

BZT03C20-TR (Similar Substitute)

This Vishay part maintains the 20 V nominal voltage but uses SOD-57 packaging instead of DO-35. Power rating increases to 1.3 W with ±6% tolerance. Impedance is reduced to 15 Ohms. Operating temperature is limited to 175°C. Substitution requires PCB layout modification due to package change. This part is suitable for applications requiring higher power dissipation capability.

BZX85B20-TAP (Similar Substitute)

This Vishay part maintains the 20 V nominal voltage and ±2% tolerance but increases power rating to 1.3 W. Package changes from DO-35 to DO-41 (DO-204AL). Operating temperature range is -55°C to 175°C. This part is AEC-Q101 qualified for automotive applications. Substitution requires PCB layout modification due to package change and is suitable for designs requiring higher power dissipation with maintained voltage tolerance.

All substitute parts are ROHS3 compliant and Active status, meeting regulatory and availability requirements.

Frequently Asked Questions (FAQ)

Q: Can BZX79-B20,143 be used as a direct replacement for BZX79-B20,113?

A: Yes. Both parts are electrically and mechanically identical with 20 V nominal voltage, ±2% tolerance, 400 mW power rating, and -65°C to 200°C operating temperature. The only difference is packaging format (Bulk versus Cut Tape). Direct substitution is applicable if packaging format does not constrain the application.

Q: What is the primary difference between the BZX79-B20,113 and 1N5250B-TAP?

A: The 1N5250B-TAP has a higher power rating (500 mW versus 400 mW) and wider tolerance (±5% versus ±2%). Operating temperature is limited to 175°C maximum. Substitution is suitable for applications that accept ±5% voltage tolerance and do not require operation below -55°C.

Q: Why does BZT03C20-TR have a different package designation (SOD-57)?

A: The BZT03C20-TR uses SOD-57 packaging, which is physically different from the DO-35 package of the original part. This package change requires PCB layout modification. The SOD-57 package accommodates the higher 1.3 W power rating through different thermal characteristics.

Q: Is BZX85B20-TAP suitable for automotive applications?

A: Yes. The BZX85B20-TAP carries AEC-Q101 qualification, indicating suitability for automotive applications. It maintains ±2% voltage tolerance and provides 1.3 W power rating. The DO-41 package differs from the original DO-35, requiring PCB layout modification.

Q: What is the impedance significance when selecting a substitute?

A: Impedance (Zzt) affects circuit response to load changes and noise filtering characteristics. Lower impedance values (15 to 25 Ohms in substitutes) provide better high-frequency performance compared to the original 55 Ohms. Selection depends on circuit requirements for transient response and ripple rejection.

Q: Can all substitute parts operate at -65°C like the original BZX79-B20,113?

A: No. The BZX79-B20,143 maintains the -65°C to 200°C range. The 1N5250B-TAP, BZT03C20-TR, and BZX85B20-TAP are limited to -55°C minimum or higher. Substitution for low-temperature applications requires the BZX79-B20,143 or confirmation that the application does not require operation below -55°C.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (BZX79-B20,143, 1N5250B-TAP, BZT03C20-TR, and BZX85B20-TAP) are ROHS3 compliant and meet regulatory requirements for restricted substance elimination.

Q: What does reverse leakage current variation mean for circuit design?

A: Reverse leakage current affects standby power consumption and circuit stability. The original part specifies 50 nA at 14 V. Substitutes range from 50 nA to 1 µA. Higher leakage values may impact low-power applications. Selection depends on circuit sensitivity to leakage current.

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