1N6004B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N6004B-TP is a 15 V, 500 mW Zener diode manufactured by Micro Commercial Co in a DO-35 through-hole package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and production continuity. Equivalent parts maintain identical electrical specifications and package form factors, while substitute parts provide functional alternatives with modified electrical characteristics or package configurations suitable for the same circuit application.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	15 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max)	32 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 11 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 100 mA
Operating Temperature Range	-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 1N6004B-TP is determined by the following critical parameters: nominal Zener voltage (15 V), voltage tolerance (±5%), maximum power dissipation (500 mW), and through-hole axial package configuration (DO-35/DO-204AH). Parts are classified into two categories:

Direct Equivalents (500 mW Power Rating): Parts maintaining identical 15 V, 500 mW specifications in DO-35 packaging. These include 1N5245BTR, BZX79C15-T50R, 1N5245B, TZX15A-TR, TZX15B-TAP, TZX15B-TR, TZX15C-TAP, and TZX15C-TR. These parts are electrically interchangeable with the main part.

Similar Substitutes (1 W Power Rating): Parts with elevated power dissipation (1 W) in larger DO-41 packages. These include 1N4744A and 1N4744ATR. While maintaining the same 15 V Zener voltage and ±5% tolerance, the increased power rating and different package form factor require circuit board layout modification.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Impedance (Max)	Package	Product Status	Operating Temp
1N6004B-TP	Micro Commercial Co	15 V	±5%	500 mW	32 Ohms	DO-35	Obsolete	-65°C ~ 200°C
1N5245BTR	onsemi	15 V	±5%	500 mW	16 Ohms	DO-35	Active	-65°C ~ 200°C
BZX79C15-T50R	Fairchild Semiconductor	15 V	±5%	500 mW	30 Ohms	DO-35	Active	-65°C ~ 200°C
1N5245B	Microchip Technology	15 V	±5%	500 mW	16 Ohms	DO-35	Active	-65°C ~ 175°C
TZX15A-TR	Vishay General Semiconductor	15 V	—	500 mW	40 Ohms	DO-35	Active	-65°C ~ 175°C
TZX15B-TAP	Vishay General Semiconductor	15 V	—	500 mW	40 Ohms	DO-35	Active	-65°C ~ 175°C
TZX15B-TR	Vishay General Semiconductor	15 V	—	500 mW	40 Ohms	DO-35	Active	-65°C ~ 175°C
TZX15C-TAP	Vishay General Semiconductor	15 V	—	500 mW	40 Ohms	DO-35	Active	-65°C ~ 175°C
TZX15C-TR	Vishay General Semiconductor	15 V	—	500 mW	40 Ohms	DO-35	Active	-65°C ~ 175°C
1N4744A	Microchip Technology	15 V	±5%	1 W	14 Ohms	DO-41	Discontinued	-65°C ~ 175°C
1N4744ATR	onsemi	15 V	±5%	1 W	14 Ohms	DO-41	Active	-65°C ~ 200°C

Engineering Selection Recommendations

For Direct Replacement (DO-35, 500 mW):

1N5245BTR (onsemi) is the primary recommended direct equivalent. This part is active, ROHS3 compliant, maintains identical electrical specifications, and is available in high volume (1555 pcs in stock). The lower impedance (16 Ohms vs. 32 Ohms) provides improved voltage regulation characteristics.

BZX79C15-T50R (Fairchild Semiconductor) is an alternative direct equivalent with impedance (30 Ohms) closely matching the original part. This part is active and available in high volume (35677 pcs in stock).

1N5245B (Microchip Technology) provides direct equivalence with identical impedance to 1N5245BTR. This part is active but operates to -65°C ~ 175°C, reducing the upper temperature margin by 25°C compared to the original specification.

TZX15 series parts (Vishay General Semiconductor: TZX15A-TR, TZX15B-TAP, TZX15B-TR, TZX15C-TAP, TZX15C-TR) are active automotive-grade components with AEC-Q101 qualification. These parts feature higher impedance (40 Ohms) and operate to -65°C ~ 175°C. The automotive qualification and high inventory availability support applications requiring enhanced reliability.

For Higher Power Applications (DO-41, 1 W):

1N4744ATR (onsemi) is the recommended substitute for applications requiring increased power dissipation. This part is active, ROHS3 compliant, and operates across the full -65°C ~ 200°C temperature range. The DO-41 package requires circuit board layout modification. The 1 W power rating accommodates higher current applications while maintaining 15 V Zener voltage regulation.

1N4744A (Microchip Technology) is discontinued at DiGi Electronics and is not recommended for new designs despite high inventory availability.

Compliance Summary:

All recommended active parts are ROHS3 compliant and REACH unaffected. The 1N4744A is RoHS non-compliant and unsuitable for applications requiring environmental compliance.

Frequently Asked Questions (FAQ)

Q: Can 1N5245BTR directly replace 1N6004B-TP without circuit modification?

A: Yes. Both parts maintain 15 V nominal Zener voltage, ±5% tolerance, 500 mW power rating, and DO-35 through-hole axial package configuration. The lower impedance of 1N5245BTR (16 Ohms vs. 32 Ohms) improves voltage regulation performance. No circuit board layout changes are required.

Q: What is the difference between TZX15A-TR, TZX15B-TR, and TZX15C-TR?

A: All three parts are functionally equivalent 15 V, 500 mW Zener diodes in DO-35 packages with identical electrical specifications. The letter designation (A, B, C) indicates manufacturing tolerance or grade classification. All are active, automotive-qualified (AEC-Q101), and suitable for direct substitution of the 1N6004B-TP.

Q: Why do some substitute parts list no tolerance specification?

A: The TZX series parts from Vishay do not specify tolerance in the provided data. This does not indicate inferior performance; rather, the tolerance information may be contained in detailed datasheets or is implicit in the part designation. These parts are automotive-qualified and suitable for applications requiring the 1N6004B-TP.

Q: Can I use 1N4744ATR (1 W) instead of 1N5245BTR (500 mW)?

A: Yes, with circuit board layout modification. The 1N4744ATR provides identical 15 V Zener voltage regulation with doubled power dissipation capability. However, the DO-41 package is physically larger than the DO-35 package, requiring different PCB footprint and lead spacing. The 1 W rating is suitable for higher current applications.

Q: What is the significance of the packaging designation (CT, TB, Bulk)?

A: Packaging designations indicate supply format: Cut Tape (CT) is supplied on continuous tape for automated assembly; Tape & Box (TB) combines tape with box packaging; Bulk indicates loose components. These designations do not affect electrical performance or interchangeability. Selection depends on manufacturing process requirements and inventory management.

Q: Is BZX79C15-T50R suitable for high-temperature applications?

A: BZX79C15-T50R operates across -65°C ~ 200°C, matching the original 1N6004B-TP temperature range. This part is suitable for high-temperature applications. The TZX series parts operate to -65°C ~ 175°C, providing 25°C less upper temperature margin.

Q: Why is 1N4744A listed as discontinued?

A: 1N4744A is discontinued at DiGi Electronics, indicating reduced availability and potential supply chain risk. For new designs, 1N4744ATR (onsemi) is the recommended 1 W alternative, as it maintains active product status and full availability.

Q: What does ROHS3 compliance mean for this application?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All recommended active parts are ROHS3 compliant, suitable for applications requiring environmental compliance and regulatory adherence.

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