1N757A/TR Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N757A/TR is a 9.1 V Zener diode manufactured by Microchip Technology, rated for 500 mW power dissipation in a through-hole DO-35 (DO-204AH) axial package. This component functions as a voltage regulator and is classified as Active product status. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility within specified tolerance ranges.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	9.1	V
Tolerance	±5%	—
Power - Max	500	mW
Impedance (Max)	10	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 7 V
Voltage - Forward (Vf) (Max) @ If	1.1	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—

Substitute Part Grouping Explanation

Substitution of the 1N757A/TR is determined by strict equivalence in the following electrical and mechanical parameters:

Critical Matching Parameters:

Nominal Zener voltage: 9.1 V
Maximum power rating: 500 mW
Maximum impedance: 10 Ohms
Operating temperature range: -65°C to 175°C
Package type: DO-35 (DO-204AH) through-hole axial configuration

Tolerance Consideration: The 1N757A/TR operates at ±5% tolerance. Substitute parts with ±2% tolerance (tighter specification) are fully compatible and provide enhanced voltage regulation accuracy. Substitute parts with ±5% tolerance maintain identical specification alignment.

All identified substitute parts meet or exceed the electrical performance requirements of the main part while maintaining mechanical and thermal compatibility.

Parameter Comparison

Parameter	1N757A/TR (Microchip)	BZX55B9V1-TAP (Vishay)	BZX55B9V1-TR (Vishay)	BZX55C9V1-TAP (Vishay)
Voltage - Zener (Nom)	9.1 V	9.1 V	9.1 V	9.1 V
Tolerance	±5%	±2%	±2%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	10 Ohms	10 Ohms	10 Ohms	10 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 7 V	100 nA @ 6.8 V	100 nA @ 6.8 V	100 nA @ 6.8 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA
Operating Temperature	-65°C to 175°C	-65°C to 175°C	-65°C to 175°C	-65°C to 175°C
Package / Case	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
Product Status	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
AEC-Q101 Qualification	Not specified	Yes	Yes	Yes

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

BZX55C9V1-TAP and BZX55B9V1-TAP/TR are suitable direct replacements for the 1N757A/TR. All three parts share identical nominal voltage (9.1 V), maximum power rating (500 mW), impedance specification (10 Ohms), and operating temperature range (-65°C to 175°C). The DO-35 through-hole axial package ensures mechanical and thermal compatibility without PCB redesign.

Tolerance Considerations:

BZX55B9V1-TAP and BZX55B9V1-TR offer ±2% tolerance, which is tighter than the 1N757A/TR specification of ±5%. This enhanced accuracy is compatible with applications requiring the 1N757A/TR and provides improved voltage regulation performance. BZX55C9V1-TAP maintains ±5% tolerance, matching the original specification exactly.

Compliance and Qualification:

All Vishay substitute parts carry ROHS3 compliance and AEC-Q101 automotive qualification. The 1N757A/TR product status is Active. All substitute parts are Active status, ensuring continued availability and manufacturing support.

Reverse Leakage Performance:

Substitute parts exhibit lower reverse leakage current (100 nA @ 6.8 V) compared to the 1N757A/TR (1 µA @ 7 V), indicating superior leakage characteristics that are compatible with the original specification.

Frequently Asked Questions (FAQ)

Q: Can BZX55B9V1-TAP replace 1N757A/TR in existing designs?

A: Yes. Both parts share identical nominal Zener voltage (9.1 V), maximum power rating (500 mW), impedance (10 Ohms), and operating temperature range (-65°C to 175°C). The DO-35 through-hole axial package is mechanically identical, requiring no PCB modifications.

Q: What is the difference between BZX55B9V1-TAP and BZX55C9V1-TAP?

A: The primary difference is tolerance specification. BZX55B9V1-TAP operates at ±2% tolerance, while BZX55C9V1-TAP operates at ±5% tolerance. Both are electrically and mechanically compatible with the 1N757A/TR. The ±2% tolerance variant provides tighter voltage regulation.

Q: Are the Vishay BZX55 series parts qualified for automotive applications?

A: Yes. All Vishay substitute parts (BZX55B9V1-TAP, BZX55B9V1-TR, BZX55C9V1-TAP) carry AEC-Q101 automotive qualification and ROHS3 compliance.

Q: Does the packaging designation affect substitution compatibility?

A: The packaging designation (TAP for Cut Tape, TR for Tape & Reel) refers to supply format only and does not affect electrical or mechanical compatibility. Both formats contain identical components in DO-35 through-hole axial packages.

Q: What is the significance of lower reverse leakage in substitute parts?

A: Substitute parts exhibit reverse leakage of 100 nA @ 6.8 V compared to 1 µA @ 7 V for the 1N757A/TR. Lower leakage current indicates superior performance and is fully compatible with applications designed for the original specification.

Q: Can these parts be used interchangeably in production?

A: Yes. All substitute parts meet or exceed the electrical specifications of the 1N757A/TR. Mechanical compatibility is confirmed through identical DO-35 through-hole axial packaging. Active product status for all parts ensures manufacturing continuity.

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