BZX79-C20,113 Zener Diode Equivalent & Substitute Parts

Part Overview

The BZX79-C20,113 is a 20 V, 400 mW Zener diode manufactured by Nexperia USA Inc. in DO-204AH (DO-35) axial through-hole package. This component is classified as Active and RoHS3 Compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, packaging preferences, or supplier availability.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	20 V
Tolerance	±5%
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

Substitute Part Grouping Explanation

Substitution of the BZX79-C20,113 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 20 V (nominal)
Power dissipation: 400 mW maximum
Tolerance: ±5% (or tighter)
Impedance: 55 Ohms maximum
Reverse leakage: 50 nA @ 14 V
Forward voltage: 900 mV @ 10 mA
Operating temperature range: -65°C ~ 200°C
Mounting type: Through Hole
Package compatibility: DO-204AH, DO-35, Axial

Substitute parts are grouped into two categories:

Parametric Equivalents (BZX79 Series): Parts BZX79-B20,113, BZX79-B20,143, BZX79-C20,133, and BZX79-C20,143 maintain identical electrical specifications with variations in packaging (Cut Tape vs. Bulk) and tolerance (±2% vs. ±5%). These parts are direct functional replacements.

Higher Power Alternatives (1N5357 Series): Parts 1N5357BG and 1N5357BRLG provide 20 V zener voltage with increased power rating (5 W) and lower impedance (3 Ohms). These are suitable for applications requiring higher power dissipation but operate within the same voltage and temperature specifications.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf (Max) @ If	Package	Packaging Type
BZX79-C20,113	Nexperia USA Inc.	20 V	±5%	400 mW	55 Ohms	900 mV @ 10 mA	DO-204AH, DO-35	Cut Tape (CT)
BZX79-B20,113	NXP Semiconductors	20 V	±2%	400 mW	55 Ohms	900 mV @ 10 mA	DO-204AH, DO-35	Bulk
BZX79-B20,143	NXP Semiconductors	20 V	±2%	400 mW	55 Ohms	900 mV @ 10 mA	DO-204AH, DO-35	Bulk
BZX79-C20,133	Nexperia USA Inc.	20 V	±5%	400 mW	55 Ohms	900 mV @ 10 mA	DO-204AH, DO-35	Cut Tape (CT)
BZX79-C20,143	NXP USA Inc.	20 V	±5%	400 mW	55 Ohms	900 mV @ 10 mA	DO-204AH, DO-35	Bulk
1N5357BG	onsemi	20 V	±5%	5 W	3 Ohms	1.2 V @ 1 A	T-18, Axial	Bulk
1N5357BRLG	onsemi	20 V	±5%	5 W	3 Ohms	1.2 V @ 1 A	T-18, Axial	Cut Tape (CT)

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

Select BZX79-B20,113 or BZX79-B20,143 when tighter tolerance (±2%) is required and bulk packaging is acceptable. Both parts maintain 400 mW power rating and 55 Ohms impedance, ensuring circuit performance equivalence.

Select BZX79-C20,133 or BZX79-C20,143 when ±5% tolerance is acceptable. BZX79-C20,133 is available in Cut Tape packaging; BZX79-C20,143 is available in Bulk packaging.

All BZX79 series substitutes are RoHS3 Compliant and REACH Unaffected, matching the compliance profile of the primary part.

For Higher Power Applications:

Select 1N5357BG or 1N5357BRLG when circuit design requires power dissipation exceeding 400 mW. These parts provide 5 W maximum power rating with lower impedance (3 Ohms), suitable for higher current applications. Package dimensions differ (T-18 vs. DO-35), requiring PCB layout verification. Both parts maintain 20 V zener voltage and -65°C ~ 200°C operating temperature range.

All substitute parts are Active status and RoHS3 Compliant.

Frequently Asked Questions (FAQ)

Q: Can BZX79-B20,113 replace BZX79-C20,113 directly?

A: Yes. Both parts share identical zener voltage (20 V), power rating (400 mW), impedance (55 Ohms), and operating temperature range (-65°C ~ 200°C). The primary difference is tolerance: BZX79-B20,113 offers ±2% versus ±5% for BZX79-C20,113. Tighter tolerance provides improved voltage regulation accuracy.

Q: What is the difference between Cut Tape and Bulk packaging?

A: Cut Tape (CT) packaging provides individual components on tape suitable for automated pick-and-place assembly. Bulk packaging contains loose components. Electrical performance is identical; packaging selection depends on assembly process requirements.

Q: Can 1N5357BRLG be used in place of BZX79-C20,113?

A: Electrical substitution is possible for applications requiring higher power dissipation. Both maintain 20 V zener voltage and ±5% tolerance. However, 1N5357BRLG uses T-18 axial package versus DO-35 for BZX79-C20,113. Physical dimensions differ, requiring PCB layout modification. 1N5357BRLG provides 5 W power rating and 3 Ohms impedance, suitable for higher current circuits.

Q: Are all substitute parts RoHS3 Compliant?

A: Yes. BZX79-B20,113, BZX79-B20,143, BZX79-C20,133, BZX79-C20,143, 1N5357BG, and 1N5357BRLG are all RoHS3 Compliant and REACH Unaffected.

Q: What determines whether a part is a valid substitute?

A: Valid substitutes must maintain the same zener voltage (20 V), operating temperature range (-65°C ~ 200°C), and through-hole mounting type. Power rating and impedance must meet or exceed circuit requirements. Tolerance, package type, and manufacturer are secondary considerations based on application needs.

Q: Which substitute offers the best voltage regulation?

A: BZX79-B20,113 and BZX79-B20,143 provide ±2% tolerance, superior to the ±5% tolerance of BZX79-C20,113. Lower tolerance improves voltage regulation accuracy in precision applications.

Q: Can packaging be mixed in a single design?

A: Yes. Cut Tape and Bulk packaging contain identical electrical components. Mixing is acceptable when assembly processes accommodate both formats. Verify with manufacturing and assembly specifications.

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