1N938 Equivalent & Substitute Parts Reference

Part Overview

The 1N938 from Microchip Technology is a Zener Diode specified for a nominal Zener voltage of 9 V, ±5% tolerance, and maximum power dissipation of 500 mW. The device is packaged in a DO-204AA (DO-7) axial through-hole format. Its product status is active, with a current inventory of 798 pieces in new original stock. Alternative models may be necessary for inventory management, compliance matching, or sourcing preferences. Selection of substitutes requires strict attention to electrical and mechanical matching parameters.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Category	Diodes, Zener
Zener Voltage (Nom) (Vz)	9 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max) (Zzt)	20 Ohms
Operating Temperature	-65°C ~ 175°C
Mounting Type	Through Hole
Package / Case	DO-204AA, DO-7, Axial
Supplier Device Package	DO-7
RoHS Status	RoHS non-compliant
REACH Status	REACH Unaffected
ECCN	EAR99
HTSUS	8541.10.0050

Substitute Part Grouping Explanation

Substitutes for the 1N938 Zener diode are determined strictly by matching the following key parameters:

Zener Voltage (Nom) (Vz): 9 V
Tolerance: ±5%
Power - Max: 500 mW
Impedance (Max) (Zzt): 20 Ohms
Operating Temperature: -65°C ~ 175°C
Mounting Type: Through Hole
Package / Case: DO-204AA, DO-7, Axial
RoHS/REACH Status and compliance codes

Only parts strictly matching these parameters are listed as substitutes.

Parameter Comparison

Parameter	1N938	1N935B	1N937B
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology
Category	Diodes, Zener	Diodes, Zener	Diodes, Zener
Zener Voltage (Nom) (Vz)	9 V	9 V	9 V
Tolerance	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW
Impedance (Max) (Zzt)	20 Ohms	20 Ohms	20 Ohms
Operating Temperature	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AA, DO-7, Axial	DO-204AA, DO-7, Axial	DO-204AA, DO-7, Axial
Supplier Device Package	DO-7	DO-7	DO-7
RoHS Status	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99	EAR99
HTSUS	8541.10.0050	8541.10.0050	8541.10.0050

Engineering Selection Recommendations

All listed substitute Zener diodes, including 1N935B and 1N937B, are active and feature identical parametric, mechanical, and compliance data as the main part, 1N938. All parts are RoHS non-compliant and REACH unaffected, with matching ECCN and HTSUS codes. Selection can be based on active product status, equivalent compliance data, and identical mechanical parameters.

Frequently Asked Questions (FAQ)

Q: Which parameters must be matched when selecting a substitute for the 1N938 Zener diode?
A: Substitution requires strict matching of Zener voltage (nominal), tolerance, maximum power rating, impedance, operating temperature, mounting type, package or case, and compliance status.

Q: Are 1N935B and 1N937B direct substitutes for 1N938?
A: Yes, based on the provided parameters, 1N935B and 1N937B match all critical electrical, mechanical, and compliance specifications.

Q: Is package compatibility ensured between 1N938 and its substitutes?
A: Yes, all devices are specified in DO-204AA, DO-7, axial through-hole format.

Q: Does RoHS or REACH status differ among substitutes?
A: All listed parts are RoHS non-compliant and REACH unaffected according to the provided information.

Q: Are there differences in inventory or manufacturer?
A: All substitutes are manufactured by Microchip Technology and differ only in inventory quantities, not specification.

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