Equivalent & Substitute Parts Reference for 1N2970B Zener Diode

Part Overview

The 1N2970B by Microchip Technology is a Zener Diode rated at 6.8 V, 10 W, with ±5% tolerance in a DO-4 chassis, stud mount package. It is designed for high-reliability voltage regulation and is now listed as obsolete. For continued functionality where the 1N2970B is specified, engineering substitution is necessary. Only parts matching all critical electrical, mechanical, and mounting parameters should be considered as equivalent or substitute Diodes, Zener for direct replacement.

Key Parameters

Parameter	Value
Manufacturer Part Number	1N2970B
Manufacturer	Microchip Technology
Category	Diodes, Zener
Voltage - Zener (Nom) (Vz)	6.8 V
Tolerance	±5%
Power - Max	10 W
Impedance (Max) (Zzt)	1.2 Ohms
Current - Reverse Leakage @ Vr	150 µA @ 5.2 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 2 A
Operating Temperature	-65°C ~ 175°C
Mounting Type	Chassis, Stud Mount
Package / Case	DO-203AA, DO-4, Stud
Supplier Device Package	DO-4
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitutes for the Microchip Technology 1N2970B Zener Diode are selected strictly based on parametric equivalence across the following criteria: Part Category (Diodes, Zener), Zener Voltage (6.8 V), Tolerance (±5%), Power Rating (10 W), Maximum Zener Impedance (1.2 Ohms), Reverse Leakage Current at 5.2 V (150 µA), Forward Voltage at 2 A (1.5 V), Operating Temperature range (-65°C ~ 175°C), Chassis or Stud Mount, DO-4 package, and Moisture Sensitivity Level 1. Only those parts explicitly matching all these parameters are listed as direct substitutes.

Parameter Comparison

Part Number	Voltage - Zener (Vz)	Tolerance	Power - Max	Impedance (Zzt)	Reverse Leakage @ Vr	Forward Voltage (Vf) @ If	Operating Temp	Mounting Type	Package / Case	Supplier Device Package	MSL	Product Status
1N2970B	6.8 V	±5%	10 W	1.2 Ohms	150 µA @ 5.2 V	1.5 V @ 2 A	-65°C ~ 175°C	Chassis, Stud Mount	DO-203AA, DO-4, Stud	DO-4	1 (Unlimited)	Obsolete
1N2970A	6.8 V	±5%	10 W	1.2 Ohms	150 µA @ 5.2 V	1.5 V @ 2 A	-65°C ~ 175°C	Chassis, Stud Mount	DO-203AA, DO-4, Stud	DO-213AA	1 (Unlimited)	Active
1N2970RB	6.8 V	±5%	10 W	1.2 Ohms	150 µA @ 5.2 V	1.5 V @ 2 A	-65°C ~ 175°C	Chassis, Stud Mount	DO-203AA, DO-4, Stud	DO-213AA	1 (Unlimited)	Active
JAN1N2970RB	6.8 V	±5%	10 W	1.2 Ohms	150 µA @ 5.2 V	1.5 V @ 2 A	-65°C ~ 175°C	Stud Mount	DO-203AA, DO-4, Stud	DO-213AA (DO-4)	1 (Unlimited)	Active
JANTX1N2970B	6.8 V	±5%	10 W	1.2 Ohms	150 µA @ 5.2 V	1.5 V @ 2 A	-65°C ~ 175°C	Stud Mount	DO-203AA, DO-4, Stud	DO-213AA (DO-4)	1 (Unlimited)	Active
JANTX1N2970RB	6.8 V	±5%	10 W	1.2 Ohms	150 µA @ 5.2 V	1.5 V @ 2 A	-65°C ~ 175°C	Stud Mount	DO-203AA, DO-4, Stud	DO-213AA (DO-4)	1 (Unlimited)	Active
JANTXV1N2970RB	6.8 V	±5%	10 W	1.2 Ohms	150 µA @ 5.2 V	1.5 V @ 2 A	-65°C ~ 175°C	Stud Mount	DO-203AA, DO-4, Stud	DO-213AA (DO-4)	1 (Unlimited)	Active

Engineering Selection Recommendations

Selection is governed by the product status (obsolete) of the primary 1N2970B Zener Diode and the availability of substitute Diodes, Zener in active production status. All substitute part numbers listed are from Microchip Technology, Zener Diode category, with identical electrical and mechanical parameters, mounting type, case, and MSL rating. Compliance information, including RoHS and REACH status, must be reviewed according to system requirements. Military grades and qualifications are provided where applicable for JAN and JANTX series for use cases requiring defined standards.

Frequently Asked Questions (FAQ)

Q1: Are all listed substitute Zener diodes compatible with the original 1N2970B mounting and package?
A1: Yes. All substitutes specify either "Chassis, Stud Mount" or "Stud Mount" and a DO-4 case.

Q2: What are the key substitution criteria for the 1N2970B Zener Diode?
A2: Substitute parts must match Zener Voltage (6.8 V), Tolerance (±5%), Power Rating (10 W), Maximum Zener Impedance (1.2 Ohms), Reverse Leakage Current, Forward Voltage, Operating Temperature, Mounting Type, Package, and MSL.

Q3: Are military-grade parts (JAN/JANTX/JANTXV) functionally equivalent to commercial types?
A3: Military-grade parts meet all primary electrical and mechanical parameters for substitution, with additional qualification per MIL-PRF standards.

Q4: Is RoHS or REACH status a deciding factor in substitution?
A4: RoHS and REACH statuses are listed for each component. Selection should conform to system compliance requirements.

Q5: What package differences exist across substitute part numbers?
A5: All parts share DO-203AA, DO-4, Stud as the main physical case specification. Supplier Device Package may be listed as DO-213AA, which refers to equivalent stud mount formats.

Q6: Why is it necessary to find substitutes for the 1N2970B?
A6: The 1N2970B Zener Diode is obsolete, making alternatives necessary for maintaining legacy designs and ensuring ongoing reliability in systems where the device is specified.

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