BZX55C39-TR Equivalent & Substitute Parts

Part Overview

The BZX55C39-TR is a 39 V, 500 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division in DO-204AH (DO-35) axial through-hole package. This component is supplied in Tape & Reel (TR) packaging and maintains Active product status with AEC-Q101 automotive qualification. The BZX55C39-TR is designed for voltage regulation and protection applications requiring precise 39 V reference voltage with ±5% tolerance. Equivalent and substitute parts are identified to address packaging format variations, tolerance requirements, and alternative manufacturer sourcing while maintaining functional compatibility within specified electrical parameters.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	39	V
Tolerance	±5%	—
Power - Maximum	500	mW
Impedance (Maximum)	90	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 30 V
Voltage - Forward (Maximum) @ If	1.5	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Package / Case	DO-204AH (DO-35)	—
Mounting Type	Through Hole	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitute parts for the BZX55C39-TR are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents (Vishay BZX55 Series): Parts BZX55B39-TAP, BZX55B39-TR, and BZX55C39-TAP maintain identical zener voltage (39 V), power rating (500 mW), package type (DO-204AH/DO-35), mounting method (through hole), operating temperature range (-65°C to 175°C), and automotive qualification (AEC-Q101). These parts differ only in packaging format (Cut Tape vs. Tape & Reel) and tolerance specification (±2% vs. ±5%). Substitution within this group is direct for applications where packaging format and tolerance are interchangeable.

Manufacturer Recommended Alternatives (Nexperia BZX79 Series): Parts BZX79-C39,113, BZX79-C39,133, and BZX79-C39,143 provide functional equivalence at 39 V zener voltage with ±5% tolerance and through-hole mounting in DO-204AH (DO-35) package. These alternatives operate across an extended temperature range (-65°C to 200°C) but feature reduced maximum power rating (400 mW vs. 500 mW), increased impedance (130 Ohms vs. 90 Ohms), and different forward voltage characteristics. Substitution requires verification that the 400 mW power rating and 130 Ohm impedance are acceptable for the application.

Parameter Comparison

Parameter	BZX55C39-TR (Main)	BZX55B39-TAP	BZX55B39-TR	BZX55C39-TAP	BZX79-C39,113	BZX79-C39,133	BZX79-C39,143
Manufacturer	Vishay	Vishay	Vishay	Vishay	Nexperia USA Inc.	NXP USA Inc.	NXP Semiconductors
Voltage - Zener (Nom)	39 V	39 V	39 V	39 V	39 V	39 V	39 V
Tolerance	±5%	±2%	±2%	±5%	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW	400 mW	400 mW	400 mW
Impedance (Max)	90 Ω	90 Ω	90 Ω	90 Ω	130 Ω	130 Ω	130 Ω
Current - Reverse Leakage @ Vr	100 nA @ 30 V	100 nA @ 30 V	100 nA @ 30 V	100 nA @ 30 V	50 nA @ 27.3 V	50 nA @ 27.3 V	50 nA @ 27.3 V
Voltage - Forward (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	-65 to 175°C	-65 to 175°C	-65 to 175°C	-65 to 175°C	-65 to 200°C	-65 to 200°C	-65 to 200°C
Package / Case	DO-204AH (DO-35)	DO-204AH (DO-35)	DO-204AH (DO-35)	DO-204AH (DO-35)	DO-204AH (DO-35)	DO-204AH (DO-35)	DO-204AH (DO-35)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Grade	Automotive	Automotive	Automotive	Automotive	—	—	—
Qualification	AEC-Q101	AEC-Q101	AEC-Q101	AEC-Q101	—	—	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—	—

Engineering Selection Recommendations

Vishay BZX55 Series Substitutes (BZX55B39-TAP, BZX55B39-TR, BZX55C39-TAP): These parts are direct functional equivalents to the BZX55C39-TR. All maintain identical zener voltage, power rating, impedance, and operating temperature range. Selection among these parts is determined by packaging requirements: BZX55C39-TAP and BZX55B39-TAP are supplied in Cut Tape format, while BZX55B39-TR is supplied in Tape & Reel format matching the original part. BZX55B39-TAP and BZX55B39-TR offer improved tolerance specification (±2%) compared to the ±5% tolerance of BZX55C39-TR and BZX55C39-TAP. All three substitute parts maintain AEC-Q101 automotive qualification and ROHS3 compliance, ensuring compatibility with automotive and regulated applications.

Nexperia BZX79 Series Alternatives (BZX79-C39,113, BZX79-C39,133, BZX79-C39,143): These parts provide functional substitution with trade-offs in power rating and impedance. The 400 mW maximum power rating represents a 20% reduction from the 500 mW rating of the BZX55C39-TR. The 130 Ohm impedance is 44% higher than the 90 Ohm impedance of the main part. These alternatives offer extended operating temperature range to 200°C and lower reverse leakage current (50 nA vs. 100 nA). Selection of BZX79 series parts is appropriate for applications where the reduced power rating and increased impedance are acceptable, and where extended temperature operation provides system benefit. These parts do not carry explicit automotive grade or AEC-Q101 qualification in the provided specifications.

Frequently Asked Questions (FAQ)

Q: Can BZX55B39-TAP be used as a direct replacement for BZX55C39-TR?

A: BZX55B39-TAP is functionally equivalent to BZX55C39-TR with respect to zener voltage (39 V), power rating (500 mW), impedance (90 Ohms), and operating temperature range (-65°C to 175°C). The primary difference is packaging format: BZX55B39-TAP is supplied in Cut Tape while BZX55C39-TR is supplied in Tape & Reel. BZX55B39-TAP also features tighter tolerance (±2% vs. ±5%). Direct substitution is possible if the Cut Tape packaging format is compatible with assembly processes.

Q: What are the key differences between Vishay BZX55 and Nexperia BZX79 series?

A: The primary differences are power rating and impedance. BZX55 series maintains 500 mW power rating and 90 Ohm impedance, while BZX79 series is rated for 400 mW and 130 Ohms. BZX79 series offers extended temperature operation to 200°C and lower reverse leakage current. Both series maintain 39 V zener voltage and ±5% tolerance. Substitution from BZX55 to BZX79 requires confirmation that the reduced power rating and increased impedance are acceptable for the application circuit.

Q: Is BZX55C39-TAP interchangeable with BZX55C39-TR?

A: BZX55C39-TAP and BZX55C39-TR are electrically identical, both featuring 39 V zener voltage, 500 mW power rating, 90 Ohm impedance, ±5% tolerance, and AEC-Q101 qualification. The difference is packaging format: BZX55C39-TAP is Cut Tape while BZX55C39-TR is Tape & Reel. Interchangeability depends on whether the assembly process can accommodate the different tape format.

Q: Can BZX79-C39,113 replace BZX55C39-TR in automotive applications?

A: BZX79-C39,113 maintains the same 39 V zener voltage and ±5% tolerance as BZX55C39-TR and operates across an extended temperature range (-65°C to 200°C). However, the 400 mW power rating is 20% lower than the 500 mW rating of BZX55C39-TR, and impedance is increased to 130 Ohms. Substitution is possible only if the application circuit can operate within these reduced power and increased impedance parameters. The BZX79-C39,113 does not carry explicit AEC-Q101 automotive qualification in the provided specifications.

Q: What is the difference between BZX55B39-TAP and BZX55B39-TR?

A: BZX55B39-TAP and BZX55B39-TR are electrically identical with identical electrical specifications: 39 V zener voltage, 500 mW power rating, 90 Ohm impedance, ±2% tolerance, and AEC-Q101 qualification. The sole difference is packaging format: BZX55B39-TAP is supplied in Cut Tape while BZX55B39-TR is supplied in Tape & Reel. Selection between these parts is determined by assembly equipment compatibility and tape format requirements.

Q: Why do BZX79 series parts have lower power ratings than BZX55 series?

A: The BZX79 series represents a different product line from Nexperia with different thermal and electrical design characteristics. The 400 mW power rating of BZX79 series reflects the thermal dissipation capability of that specific device design. While both series maintain the same 39 V zener voltage, they are optimized for different application requirements. The BZX79 series offers advantages in extended temperature range and lower leakage current at the trade-off of reduced power handling capability.

Q: Are all substitute parts ROHS3 compliant?

A: All Vishay BZX55 series parts (BZX55C39-TR, BZX55B39-TAP, BZX55B39-TR, BZX55C39-TAP) are explicitly listed as ROHS3 compliant. BZX79-C39,113 is also listed as ROHS3 compliant. ROHS compliance status for BZX79-C39,133 and BZX79-C39,143 is not specified in the provided data.

Q: What packaging formats are available for 39 V, 500 mW Zener diodes in DO-35?

A: Within the Vishay BZX55 series at 39 V and 500 mW, two packaging formats are available: Tape & Reel (TR) format represented by BZX55C39-TR and BZX55B39-TR, and Cut Tape (CT) format represented by BZX55C39-TAP and BZX55B39-TAP. Selection depends on assembly process requirements and equipment compatibility.

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