Equivalent & Substitute Parts Reference for BZX79-C56,113

Part Overview

The BZX79-C56,113 from Nexperia USA Inc. is a Zener diode with a nominal Zener voltage of 56 V, a power dissipation rating of 400 mW, and a tolerance of ±5%. It is supplied in a DO-204AH (DO-35), axial through-hole package. This component is active, RoHS3 compliant, and has unlimited moisture sensitivity level (MSL 1). Identifying alternative parts is necessary to support continuity of supply, address sourcing challenges, or satisfy BOM flexibility without compromising on critical electrical, mechanical, and compliance requirements.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	56 V
Tolerance	±5%
Power - Max	400 mW
Impedance (Max) (Zzt)	200 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 39.2 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
Moisture Sensitivity Level (MSL)	1 (Unlimited)
RoHS Status	ROHS3 Compliant
REACH Status	REACH Unaffected
ECCN	EAR99
HTSUS	8541.10.0050
Product Status	Active

Substitute Part Grouping Explanation

Parametric equivalence and substitution are based strictly on electrical and mechanical attributes specified: Zener voltage (56 V), tolerance, maximum power rating, maximum impedance, reverse leakage current, forward voltage, operating temperature range, mounting type (through-hole), package/case compatibility, and compliance (RoHS3, REACH, ECCN, MSL). Only parts matching or exceeding these parameters and with the correct package type are listed as functional substitutes within this Zener diode category.

Parameter Comparison

Part Number	Manufacturer	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	MSL	RoHS Status	REACH Status	ECCN	HTSUS	Product Status
BZX79-C56,113	Nexperia USA Inc.	56 V	±5%	400 mW	200 Ohms	50 nA @ 39.2 V	900 mV @ 10 mA	-65°C ~ 200°C	Through Hole	DO-204AH, DO-35, Axial	1 (Unlimited)	ROHS3 Compliant	REACH Unaffected	EAR99	8541.10.0050	Active
BZX79-B56,113	Nexperia USA Inc.	56 V	±2%	400 mW	200 Ohms	50 nA @ 39.2 V	900 mV @ 10 mA	-65°C ~ 200°C	Through Hole	DO-204AH, DO-35, Axial	1 (Unlimited)	ROHS3 Compliant	REACH Unaffected	EAR99	8541.10.0050	Active
1N4758A-TAP	Vishay General Semiconductor - Diodes Division	56 V	±5%	1.3 W	110 Ohms	5 µA @ 42.6 V	1.2 V @ 200 mA	175°C (TJ)	Through Hole	DO-204AL, DO-41, Axial	1 (Unlimited)	ROHS3 Compliant	REACH Unaffected	EAR99	8541.10.0050	Active
BZX55B56-TAP	Vishay General Semiconductor - Diodes Division	56 V	±2%	500 mW	135 Ohms	100 nA @ 43 V	1.5 V @ 200 mA	-65°C ~ 175°C	Through Hole	DO-204AH, DO-35, Axial	1 (Unlimited)	ROHS3 Compliant	REACH Unaffected	EAR99	8541.10.0050	Active

Engineering Selection Recommendations

All listed substitute Zener diodes (BZX79-B56,113; 1N4758A-TAP; BZX55B56-TAP) are classified as Active and meet RoHS3 compliance and REACH unaffected status. Each part holds a moisture sensitivity level of 1 (unlimited), with ECCN EAR99 and HTSUS 8541.10.0050 designations, ensuring compatibility for commercial applications where these certifications are mandatory. Selection should be based on matching electrical and package parameters as summarized above, as well as compliance and inventory availability.

Frequently Asked Questions (FAQ)

Q: What are the most critical parameters when selecting a Zener diode substitute in the DO-35, DO-41, or DO-204AH/AL package?
A: The most critical parameters are the nominal Zener voltage, tolerance, maximum power rating, impedance, reverse leakage current, forward voltage, operating temperature, mounting type (through-hole), and package outline.

Q: Are all listed substitutes compatible in terms of mounting and footprint?
A: BZX79-C56,113, BZX79-B56,113, and BZX55B56-TAP use the DO-204AH (DO-35) axial package, ensuring direct mechanical compatibility. 1N4758A-TAP uses DO-204AL (DO-41) axial, which is similar in lead configuration and mechanical compatibility with DO-35 in most through-hole applications.

Q: Is compliance with RoHS and REACH maintained with all substitutes?
A: All referenced Zener diode substitutes are RoHS3 compliant and REACH unaffected, with a moisture sensitivity level of 1 (unlimited).

Q: Can a substitute with a lower or higher maximum power rating be used?
A: Substitutes provided match or exceed the power rating where applicable (e.g., 1.3 W for 1N4758A-TAP), but only listed values are considered.

Q: What is the significance of the tolerance value (±2% vs. ±5%)?
A: Tolerance indicates the range of actual Zener voltage. Substitutes with ±2% offer tighter voltage control; for applications requiring ±5%, both ±2% and ±5% units are valid.

Q: How do impedance and forward voltage differences affect substitution?
A: Substitute devices are listed strictly according to their specified impedance and maximum forward voltage. Compatibility is ensured as per the tabled values.

Q: Are all substitutes currently active and in stock according to the provided parameters?
A: All listed Zener diode substitutes are designated as Active with inventory, as given in the input data.

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