1N5937B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5937B-TP is a 33 V, 1.5 W Zener diode manufactured by Micro Commercial Co in a DO-41G through-hole axial package. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design requirements and procurement needs. Substitute parts must maintain electrical performance within the specified zener voltage, power dissipation, and thermal operating range parameters.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	33	V
Tolerance	±5%	%
Power - Max	1.5	W
Impedance (Max)	33	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 25.1 V
Voltage - Forward (Max) @ If	1.2	V @ 200 mA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	-
Package / Case	DO-204AL, DO-41, Axial	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the 1N5937B-TP is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Zener voltage: 33 V nominal with ±5% tolerance
Power dissipation capability: minimum 1.5 W
Package type: DO-41 through-hole axial configuration
Mounting compatibility: through-hole PCB assembly
Compliance: ROHS3 compliant

Secondary Compatibility Factors:

Impedance (Zzt): maximum 45 Ohms acceptable
Reverse leakage current: maximum 5 µA @ 25.1 V acceptable
Forward voltage: maximum 1.5 V @ 200 mA acceptable
Operating temperature: minimum -55°C to 150°C range

Parts meeting these criteria are classified as direct electrical and mechanical substitutes. The 1N5937BP-TP and 1N4752A-TR satisfy these parameters within the specified tolerances.

Parameter Comparison

Parameter	1N5937B-TP	1N5937BP-TP	1N4752A-TR
Manufacturer	Micro Commercial Co	Micro Commercial Co	Vishay General Semiconductor
Product Status	Obsolete	Active	Active
Voltage - Zener (Nom)	33 V	33 V	33 V
Tolerance	±5%	±5%	±5%
Power - Max	1.5 W	1.5 W	1.3 W
Impedance (Max)	33 Ohms	33 Ohms	45 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 25.1 V	1 µA @ 25.1 V	5 µA @ 25.1 V
Voltage - Forward (Max) @ If	1.2 V @ 200 mA	1.5 V @ 200 mA	1.2 V @ 200 mA
Operating Temperature Range	-55 to 150°C	-55 to 175°C	-55 to 175°C
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT)
Qualification	-	-	AEC-Q101 Automotive

Engineering Selection Recommendations

1N5937BP-TP (Micro Commercial Co)

The 1N5937BP-TP is the primary substitute for the obsolete 1N5937B-TP. Both components share identical electrical specifications: 33 V zener voltage, ±5% tolerance, 1.5 W power rating, and 33 Ohms maximum impedance. The 1N5937BP-TP is currently in active production status with 724 pieces in stock. The extended operating temperature range (-55°C to 175°C) provides additional thermal margin compared to the original part. This substitute maintains full electrical and mechanical compatibility with existing PCB designs without modification.

1N4752A-TR (Vishay General Semiconductor)

The 1N4752A-TR is a secondary substitute option from Vishay General Semiconductor. It maintains the 33 V zener voltage and ±5% tolerance specification. The power rating is 1.3 W, which is 0.2 W lower than the original 1.5 W specification. The impedance is 45 Ohms, exceeding the original 33 Ohms maximum. Reverse leakage current is 5 µA, higher than the original 1 µA specification. The 1N4752A-TR carries AEC-Q101 automotive qualification and is actively produced with 39,707 pieces in stock. This part is suitable for applications where the reduced power dissipation and higher impedance are acceptable within circuit design margins.

Frequently Asked Questions (FAQ)

Q: Can the 1N5937BP-TP directly replace the 1N5937B-TP without PCB modification?

A: Yes. The 1N5937BP-TP is electrically and mechanically identical to the 1N5937B-TP. Both use the DO-41 axial through-hole package with identical pin spacing and orientation. No PCB layout changes are required.

Q: What is the difference between the 1N5937BP-TP and 1N4752A-TR?

A: The 1N5937BP-TP maintains the original 1.5 W power rating and 33 Ohms impedance. The 1N4752A-TR has a 1.3 W power rating and 45 Ohms impedance. Both maintain the 33 V zener voltage specification. The 1N4752A-TR includes AEC-Q101 automotive qualification, while the 1N5937BP-TP does not.

Q: Which substitute should be selected for a new design?

A: The 1N5937BP-TP is recommended for designs requiring the full 1.5 W power dissipation capability and lower impedance. The 1N4752A-TR is suitable for applications where automotive qualification is required and the reduced power rating is acceptable.

Q: Are there packaging differences between the substitutes?

A: Both substitutes use the DO-41 through-hole axial package. The 1N5937BP-TP is supplied in Tape & Reel (TR) packaging, while the 1N4752A-TR is supplied in Cut Tape (CT) packaging. Both are compatible with standard through-hole PCB assembly processes.

Q: What is the operating temperature difference between the original and substitutes?

A: The original 1N5937B-TP operates from -55°C to 150°C. Both substitutes extend the upper temperature limit to 175°C, providing additional thermal margin for high-temperature applications.

Q: Are all three parts RoHS3 compliant?

A: Yes. The 1N5937B-TP, 1N5937BP-TP, and 1N4752A-TR are all ROHS3 compliant with Moisture Sensitivity Level 1 (unlimited).

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message