BZX79-C39,113 Equivalent & Substitute Parts

Part Overview

The BZX79-C39,113 is an active-status Zener diode manufactured by Nexperia USA Inc., rated for 39 V nominal Zener voltage with 400 mW maximum power dissipation and ±5% voltage tolerance. This through-hole component operates across a temperature range of -65°C to 200°C and is packaged in the DO-204AH/DO-35 axial configuration. The device is ROHS3 compliant and REACH unaffected, making it suitable for modern electronic applications requiring voltage regulation and transient protection.

Equivalent and substitute parts are identified when they maintain identical or superior electrical performance characteristics while meeting the same mechanical and environmental specifications. Substitution becomes necessary when the primary part number experiences supply constraints, obsolescence, or when alternative packaging formats are required for manufacturing optimization.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	39	V
Tolerance	±5%	—
Power - Maximum	400	mW
Impedance (Maximum)	130	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 27.3 V
Voltage - Forward (Maximum) @ 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 Zener diodes is determined by equivalence in the following critical parameters:

Primary Equivalence Criteria:

Zener voltage (Vz): Must be 39 V nominal
Maximum power dissipation: Must be 400 mW
Impedance (Zzt): Must be 130 Ohms maximum
Reverse leakage current: Must be 50 nA @ 27.3 V
Forward voltage: Must be 900 mV maximum @ 10 mA
Operating temperature range: Must span -65°C to 200°C
Mounting type: Must be through-hole configuration
Package: Must be DO-204AH/DO-35 axial format

Secondary Compatibility Factors:

Voltage tolerance: ±5% or tighter (±2% is acceptable as superior specification)
Regulatory compliance: ROHS3 and REACH status
Product status: Active

All identified substitute parts maintain identical electrical performance across the specified operating conditions. Tolerance variations (±5% versus ±2%) represent tighter control in substitute options, which does not compromise compatibility but may provide improved circuit performance in precision applications.

Parameter Comparison

Parameter	BZX79-C39,113	BZX79-B39,113	BZX79-C39,133	BZX79-C39,143
Manufacturer	Nexperia USA Inc.	Nexperia USA Inc.	NXP USA Inc.	NXP Semiconductors
Voltage - Zener (Nom)	39 V	39 V	39 V	39 V
Tolerance	±5%	±2%	±5%	±5%
Power - Max	400 mW	400 mW	400 mW	400 mW
Impedance (Max)	130 Ohms	130 Ohms	130 Ohms	130 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 27.3 V	50 nA @ 27.3 V	50 nA @ 27.3 V	50 nA @ 27.3 V
Voltage - Forward (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	-65°C ~ 200°C	-65°C ~ 200°C	-65°C ~ 200°C	-65°C ~ 200°C
Mounting Type	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	DO-204AH, DO-35, Axial
Packaging Format	Cut Tape (CT)	Cut Tape (CT)	Bulk	Bulk
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified	Not specified
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

BZX79-B39,113 (Nexperia USA Inc.)

This substitute provides tighter voltage tolerance (±2% versus ±5%), delivering superior Zener voltage accuracy. All electrical parameters remain identical to the primary part. This option is suitable for applications requiring enhanced voltage regulation precision. Both parts are ROHS3 compliant and maintain active product status. The primary distinction is packaging format: BZX79-B39,113 is supplied in cut tape, matching the original part's delivery method.

BZX79-C39,133 (NXP USA Inc.)

This substitute maintains identical electrical specifications and voltage tolerance (±5%) to the primary part. The key difference is packaging format: supplied in bulk rather than cut tape. This option is appropriate for high-volume manufacturing environments where bulk packaging reduces component handling and tape waste. Product status is active; RoHS compliance status is not specified in available documentation.

BZX79-C39,143 (NXP Semiconductors)

This substitute maintains identical electrical specifications and voltage tolerance (±5%) to the primary part. Packaging is supplied in bulk format. Product status is active with REACH unaffected status confirmed. This option is suitable for applications where bulk packaging is preferred and NXP Semiconductors sourcing is acceptable.

All three substitute parts are electrically and mechanically compatible with the BZX79-C39,113 for applications requiring 39 V Zener regulation at 400 mW power dissipation across the -65°C to 200°C operating range.

Frequently Asked Questions (FAQ)

Q: Can BZX79-B39,113 be used as a direct replacement for BZX79-C39,113?

A: Yes. BZX79-B39,113 is electrically compatible with identical Zener voltage (39 V), power rating (400 mW), impedance (130 Ohms), and operating temperature range (-65°C to 200°C). The ±2% tolerance specification is tighter than the ±5% of the primary part, providing superior voltage accuracy without compromising compatibility. Both use identical DO-204AH/DO-35 axial packaging.

Q: What is the difference between cut tape and bulk packaging?

A: Cut tape (CT) packaging supplies components on individual tape segments, suitable for automated pick-and-place assembly in moderate-volume production. Bulk packaging supplies loose components, typically used in high-volume manufacturing or manual assembly environments. Electrical performance is identical; the difference is purely in delivery and handling format.

Q: Are all substitute parts ROHS3 compliant?

A: BZX79-C39,113 and BZX79-B39,113 are confirmed ROHS3 compliant. RoHS compliance status for BZX79-C39,133 and BZX79-C39,143 is not specified in the provided documentation. Verify compliance requirements with your procurement or quality assurance department before selection.

Q: Can I use BZX79-C39,143 in place of BZX79-C39,113?

A: Yes. BZX79-C39,143 maintains identical electrical specifications: 39 V Zener voltage, 400 mW power dissipation, 130 Ohms impedance, and -65°C to 200°C operating range. Both use DO-204AH/DO-35 axial through-hole packaging. The primary difference is packaging format (bulk versus cut tape) and manufacturer designation (NXP Semiconductors versus Nexperia USA Inc.).

Q: Which substitute offers the best voltage regulation accuracy?

A: BZX79-B39,113 provides ±2% voltage tolerance compared to ±5% for the primary part and other substitutes. This tighter tolerance specification results in more precise Zener voltage control, beneficial for applications requiring strict voltage regulation. All other electrical parameters remain identical.

Q: Are there any temperature or environmental limitations when substituting these parts?

A: All substitute parts maintain the identical operating temperature range of -65°C to 200°C. No additional environmental limitations are introduced by substitution. Verify that your application's thermal management and operating conditions remain within this specified range.

Q: Can I mix different substitute parts in the same circuit board assembly?

A: Yes. All substitute parts are electrically equivalent and use identical DO-204AH/DO-35 axial packaging. Mixing different part numbers in the same assembly does not create compatibility issues, provided all parts are installed in the correct polarity and orientation. However, standard manufacturing practice typically specifies a single part number per design revision to maintain consistency and traceability.

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