1N3321 Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N3321 is a 24 V, 50 W Zener diode manufactured by Solid State Inc. in a DO-5 stud mount package. This component is classified as an active product with 1087 units currently in stock. The 1N3321 serves as a voltage regulation and transient protection element in power supply and circuit protection applications.

Substitute parts become necessary when the primary part number reaches end-of-life status, inventory depletion occurs, or when design requirements permit tolerance or compliance variations. The following equivalent Zener diodes maintain the core electrical specifications while offering alternative sourcing options from different manufacturers and packaging configurations.

Substiute Parts

1N3321

Solid State Inc.In Stock: 11561N3321 Datasheet

Current PartRFQ

1N3321R

Solid State Inc.In Stock: 11901N3321R Datasheet

Parametric EquivalentRFQ

1N3321RA

Microchip TechnologyIn Stock: 8151N3321RA Datasheet

Parametric EquivalentRFQ

1N3321RB

Microchip TechnologyIn Stock: 12711N3321RB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 1N3321 Zener diode is determined by the following core parameters:

Critical Parameters (Must Match):

• Voltage - Zener (Nom): 24 V
• Power - Max: 50 W
• Impedance (Max): 2.6 Ohms
• Voltage - Forward (Max) @ If: 1.5 V @ 10 A
• Operating Temperature Range: -65°C to 175°C
• Mounting Type: Stud Mount
• Package / Case: DO-203AB, DO-5, Stud

Variable Parameters (Permitted Variation):

• Tolerance: ±20%, ±10%, or ±5%
• Manufacturer: Solid State Inc. or Microchip Technology
• Packaging Configuration: Box, Bulk, or unspecified
• RoHS Status: ROHS3 Compliant or RoHS non-compliant
• Product Status: Active or Discontinued at DiGi Electronics

All substitute parts listed maintain identical electrical performance characteristics and mechanical compatibility with the original 1N3321 specification.

Parameter Comparison

Engineering Selection Recommendations

1N3321R (Solid State Inc.)

The 1N3321R is a direct parametric equivalent manufactured by Solid State Inc. with identical electrical specifications and ROHS3 compliance. This part maintains the ±20% tolerance of the original 1N3321 and is currently active with 1094 units in inventory. Selection of the 1N3321R is appropriate for applications where ROHS3 compliance is required and tolerance specifications permit ±20% variation.

1N3321RA (Microchip Technology)

The 1N3321RA is manufactured by Microchip Technology with improved tolerance specification of ±10%, compared to the original ±20%. This part is currently active with 802 units in inventory. The 1N3321RA does not carry ROHS3 compliance and is classified as RoHS non-compliant. Selection of the 1N3321RA is appropriate for applications where tighter voltage tolerance is required and RoHS compliance is not mandated. The part supports both Chassis and Stud Mount configurations.

1N3321RB (Microchip Technology)

The 1N3321RB is manufactured by Microchip Technology with the tightest tolerance specification of ±5%. This part is currently discontinued at DiGi Electronics but maintains 1177 units in inventory. The 1N3321RB does not carry ROHS3 compliance and is classified as RoHS non-compliant. Selection of the 1N3321RB is appropriate for applications requiring the highest voltage accuracy and where RoHS compliance is not mandated. The part supports both Chassis and Stud Mount configurations. Availability should be verified prior to design commitment due to discontinued status.

Frequently Asked Questions (FAQ)

Q: Can the 1N3321R be used as a direct replacement for the 1N3321?

A: Yes. The 1N3321R maintains identical electrical specifications including 24 V nominal Zener voltage, 50 W maximum power dissipation, 2.6 Ohms maximum impedance, and -65°C to 175°C operating temperature range. Both parts are ROHS3 compliant and feature stud mount packaging in the DO-5 case style. The primary difference is packaging configuration (Box versus unspecified).

Q: What is the difference between the tolerance specifications of these parts?

A: The 1N3321 and 1N3321R specify ±20% tolerance on the Zener voltage. The 1N3321RA specifies ±10% tolerance, and the 1N3321RB specifies ±5% tolerance. Tighter tolerance specifications result in more precise voltage regulation. Selection depends on circuit requirements for voltage accuracy.

Q: Are there RoHS compliance differences between these parts?

A: Yes. The 1N3321 and 1N3321R are ROHS3 compliant. The 1N3321RA and 1N3321RB are RoHS non-compliant. Applications subject to RoHS directives must use either the 1N3321 or 1N3321R.

Q: What mounting configurations are supported?

A: The 1N3321 and 1N3321R support Stud Mount configuration. The 1N3321RA and 1N3321RB support both Chassis and Stud Mount configurations. All parts use the DO-203AB, DO-5, Stud package style.

Q: Is the 1N3321RB still available for new designs?

A: The 1N3321RB is discontinued at DiGi Electronics but currently maintains 1177 units in inventory. Availability should be confirmed with the supplier before committing this part to production designs.

Q: Can these parts be used interchangeably in existing applications?

A: Interchangeability depends on application requirements. All parts maintain the same 24 V nominal voltage, 50 W power rating, and operating temperature range. Differences in tolerance, RoHS compliance, and product status must be evaluated against specific circuit requirements and regulatory constraints.