BZX79-C51,113 Equivalent & Substitute Parts

Part Overview

The BZX79-C51,113 is a through-hole Zener diode manufactured by Nexperia USA Inc., rated at 51 V nominal with 400 mW maximum power dissipation and ±5% voltage tolerance. The device is packaged in DO-204AH (DO-35) axial configuration and is classified as Active product status with full RoHS3 compliance. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory availability, packaging format preferences, or tolerance specifications that meet application requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	51	V
Tolerance	±5%	—
Power - Max	400	mW
Impedance (Max)	180	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 35.7 V	—
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	—
Operating Temperature Range	-65 to 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-C51,113 is determined by the following critical parameters:

Electrical Equivalence Criteria:

Zener voltage (Nom): 51 V
Power rating: 400 mW
Impedance (Max): 180 Ohms
Reverse leakage current: 50 nA @ 35.7 V
Forward voltage: 900 mV @ 10 mA
Operating temperature range: -65°C to 200°C

Mechanical Compatibility Criteria:

Mounting type: Through Hole
Package / Case: DO-204AH, DO-35, Axial

Compliance Criteria:

RoHS3 Compliant
REACH Unaffected
Moisture Sensitivity Level: 1 (Unlimited)

The substitute parts BZX79-B51,113 and BZX79-B51,133 maintain identical electrical performance across all critical parameters. The primary distinction is voltage tolerance specification (±2% versus ±5%) and packaging format (Cut Tape versus Tape & Reel).

Parameter Comparison

Parameter	BZX79-C51,113	BZX79-B51,113	BZX79-B51,133
Manufacturer	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.
Category	Diodes, Zener	Diodes, Zener	Diodes, Zener
Voltage - Zener (Nom)	51 V	51 V	51 V
Tolerance	±5%	±2%	±2%
Power - Max	400 mW	400 mW	400 mW
Impedance (Max)	180 Ohms	180 Ohms	180 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 35.7 V	50 nA @ 35.7 V	50 nA @ 35.7 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	-65°C to 200°C	-65°C to 200°C	-65°C to 200°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
Packaging Format	Tape & Reel (TR)	Cut Tape (CT)	Cut Tape (CT)
Product Status	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

BZX79-B51,113 and BZX79-B51,133 Substitution Suitability:

Both substitute parts are functionally equivalent to the BZX79-C51,113 across all critical electrical parameters. All three devices maintain Active product status and full RoHS3 compliance with REACH Unaffected designation. The substitute parts feature improved voltage tolerance (±2% versus ±5%), which provides tighter zener voltage specification without compromising circuit compatibility.

The primary distinction between the main part and substitutes is packaging format. The BZX79-C51,113 is supplied in Tape & Reel (TR) format, while BZX79-B51,113 and BZX79-B51,133 are supplied in Cut Tape (CT) format. Both packaging formats are compatible with standard through-hole assembly processes and do not affect electrical performance or mechanical fit within DO-35 axial package specifications.

Selection between substitute parts should be based on packaging format requirements and inventory availability. The ±2% tolerance specification of the substitute parts represents an enhancement over the ±5% tolerance of the main part and is suitable for applications requiring tighter voltage regulation.

Frequently Asked Questions (FAQ)

Q: Are BZX79-B51,113 and BZX79-B51,133 electrically identical to BZX79-C51,113?

A: Yes. All three devices share identical zener voltage (51 V), power rating (400 mW), impedance (180 Ohms), reverse leakage current (50 nA @ 35.7 V), forward voltage (900 mV @ 10 mA), and operating temperature range (-65°C to 200°C). The substitute parts feature tighter voltage tolerance (±2% versus ±5%).

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) packaging?

A: Tape & Reel packaging supplies components on continuous tape wound on a reel, suitable for high-volume automated assembly. Cut Tape packaging supplies components on tape segments cut to specific lengths, suitable for lower-volume or manual assembly processes. Both formats contain identical components in DO-35 axial packages and do not affect electrical performance or mechanical compatibility.

Q: Can I use BZX79-B51,113 or BZX79-B51,133 as a direct replacement for BZX79-C51,113?

A: Yes. Both substitute parts are direct replacements. They maintain identical electrical specifications, mechanical compatibility, and compliance certifications. The improved ±2% voltage tolerance of the substitute parts is compatible with applications designed for the ±5% tolerance specification.

Q: Are all three parts RoHS3 compliant?

A: Yes. BZX79-C51,113, BZX79-B51,113, and BZX79-B51,133 are all ROHS3 Compliant with REACH Unaffected status and Moisture Sensitivity Level 1 (Unlimited).

Q: What determines whether a part can substitute for BZX79-C51,113?

A: Substitution is determined by matching zener voltage (51 V), power rating (400 mW), impedance (180 Ohms), reverse leakage current (50 nA @ 35.7 V), forward voltage (900 mV @ 10 mA), operating temperature range (-65°C to 200°C), through-hole mounting type, and DO-35 axial package configuration. Compliance with RoHS3 and REACH requirements is mandatory.

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