SA13C-B Equivalent & Substitute Parts

Part Overview

The SA13C-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for telecom applications. This bidirectional Zener diode operates with a 13V reverse standoff voltage and provides 21.5V clamping at peak pulse current. The device is packaged in a DO-204AC (DO-15) through-hole axial configuration and rated for 500W peak pulse power dissipation across an operating temperature range of -65°C to 175°C.

The SA13C-B carries an obsolete product status. Identifying equivalent substitute parts ensures design continuity and maintains supply chain reliability for applications requiring this specific voltage suppression performance.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	13	V
Voltage - Breakdown (Min)	14.4	V
Voltage - Clamping (Max) @ Ipp	21.5	V
Current - Peak Pulse (10/1000µs)	23.7	A
Power - Peak Pulse	500	W
Operating Temperature Range	-65 to 175	°C (TJ)
Package / Case	DO-204AC (DO-15)	Axial Through-Hole
Bidirectional Channels	1	N/A

Substitute Part Grouping Explanation

Substitution of the SA13C-B is determined by strict equivalence across the following critical parameters:

Voltage Parameters: The reverse standoff voltage (13V), breakdown voltage minimum (14.4V), and clamping voltage maximum (21.5V) must remain identical to ensure proper circuit protection without altering transient suppression characteristics.

Current Rating: Peak pulse current capacity must meet or exceed the original specification (23.7A at 10/1000µs pulse duration) to maintain adequate surge handling capability.

Power Dissipation: Peak pulse power rating of 500W establishes the thermal performance requirement for the suppression event.

Package Configuration: The DO-204AC (DO-15) axial through-hole package is mandatory for mechanical and electrical compatibility with existing PCB layouts.

Electrical Type: Zener diode topology with single bidirectional channel configuration must be preserved.

The SA13CA qualifies as a direct substitute based on matching all critical voltage parameters, equivalent package configuration, and compatible current rating (24A vs. 23.7A).

Parameter Comparison

Parameter	SA13C-B (Main Part)	SA13CA (Substitute)	Match Status
Manufacturer	Littelfuse Inc.	Taiwan Semiconductor Corporation	Different Manufacturer
Voltage - Reverse Standoff (Typ)	13V	13V	Equivalent
Voltage - Breakdown (Min)	14.4V	14.4V	Equivalent
Voltage - Clamping (Max) @ Ipp	21.5V	21.5V	Equivalent
Current - Peak Pulse (10/1000µs)	23.7A	24A	Substitute Exceeds
Power - Peak Pulse	500W	500W	Equivalent
Operating Temperature Range	-65°C to 175°C	-55°C to 175°C	Substitute Range Narrower
Package / Case	DO-204AC (DO-15)	DO-204AC (DO-15)	Equivalent
Type	Zener	Zener	Equivalent
Bidirectional Channels	1	1	Equivalent
Product Status	Obsolete	Active	Substitute Active
RoHS Status	RoHS Compliant	ROHS3 Compliant	Both Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent

Engineering Selection Recommendations

The SA13CA serves as a functional equivalent to the obsolete SA13C-B based on matching voltage suppression characteristics, identical package configuration, and equivalent power dissipation rating.

Product Status Consideration: The SA13CA maintains active product status with established supply availability (8250 pcs in stock), whereas the SA13C-B is obsolete. This transition supports long-term design sustainability.

Compliance Status: Both parts maintain RoHS compliance. The SA13CA carries ROHS3 Compliant designation with REACH Unaffected status, indicating current regulatory alignment.

Temperature Operating Range: The SA13CA specifies a narrower minimum operating temperature (-55°C vs. -65°C). Applications requiring operation below -55°C require verification against specific circuit requirements.

Current Rating: The SA13CA peak pulse current specification (24A) exceeds the original requirement (23.7A), providing equivalent or improved transient suppression performance.

Packaging: Both parts utilize identical DO-204AC (DO-15) axial through-hole packaging, ensuring direct mechanical and electrical compatibility without PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can the SA13CA directly replace the SA13C-B in existing designs?

A: Yes. The SA13CA matches all critical voltage parameters (13V standoff, 14.4V breakdown, 21.5V clamping), power rating (500W), and package configuration (DO-204AC through-hole). The substitute current rating (24A) meets or exceeds the original specification (23.7A).

Q: What is the significance of the different operating temperature ranges?

A: The SA13C-B operates from -65°C to 175°C, while the SA13CA operates from -55°C to 175°C. The SA13CA has a narrower minimum temperature specification. Applications requiring operation below -55°C must confirm compatibility with circuit thermal requirements.

Q: Are there packaging differences between these parts?

A: No. Both the SA13C-B and SA13CA use identical DO-204AC (DO-15) axial through-hole packaging. No PCB layout modifications are required for substitution.

Q: Why is the SA13C-B listed as obsolete?

A: The SA13C-B carries obsolete product status from Littelfuse Inc. The SA13CA, manufactured by Taiwan Semiconductor Corporation, provides equivalent electrical performance with active product status and established supply chain availability.

Q: Does the SA13CA meet current regulatory requirements?

A: Yes. The SA13CA is ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory standards. The original SA13C-B is RoHS Compliant but carries obsolete status.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution is determined by matching reverse standoff voltage (13V), breakdown voltage (14.4V minimum), clamping voltage (21.5V maximum), peak pulse power (500W), package type (DO-204AC), and Zener diode topology. Peak pulse current must meet or exceed 23.7A.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message