SA150 Equivalent & Substitute Parts

Part Overview

The SA150 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., rated for 150V reverse standoff voltage with a 255.15V maximum clamping voltage. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The SA150 operates across a temperature range of -55°C to 175°C and is housed in a DO-204AC (DO-15) axial through-hole package, suitable for general-purpose transient voltage protection applications.

Substiute Parts

SA150

Littelfuse Inc.In Stock: 923SA150 Datasheet

Current PartRFQ

SA150A

Fairchild SemiconductorIn Stock: 16654SA150A Datasheet

DirectRFQ

5KP150A

Littelfuse Inc.In Stock: 33925KP150A Datasheet

MFR RecommendedRFQ

SA150A-AP

Micro Commercial CoIn Stock: 921SA150A-AP Datasheet

MFR RecommendedRFQ

SA150A-BP

Micro Commercial CoIn Stock: 809SA150A-BP Datasheet

MFR RecommendedRFQ

SA150A-TP

Micro Commercial CoIn Stock: 762SA150A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA150 is determined by the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 150V
• Voltage - Clamping (Max) @ Ipp: Must not exceed 255.15V
• Current - Peak Pulse (10/1000µs): 2.1A minimum
• Power - Peak Pulse: 500W minimum
• Operating Temperature Range: -55°C to 175°C
• Mounting Type: Through Hole
• Package / Case: DO-204AC (DO-15) or equivalent axial configuration
• Type: Zener, Unidirectional

Substitute parts are grouped into two categories based on these parameters:

Category 1: Direct Electrical & Package Equivalents (SA150A, SA150A-AP, SA150A-BP, SA150A-TP) These parts maintain identical reverse standoff voltage (150V), peak pulse current (2.1A), power rating (500W), and through-hole axial packaging. Clamping voltage is 243V, which is within acceptable limits below the original 255.15V specification.

Category 2: Enhanced Performance Substitute (5KP150A) This part maintains the 150V reverse standoff voltage and 243V clamping voltage but provides significantly higher peak pulse current (21A) and power dissipation (5kW). The package is P600 axial through-hole, which is mechanically compatible with DO-15 footprints in most applications. This substitute is suitable for applications requiring higher transient energy absorption.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred for Existing Designs): Select SA150A-AP, SA150A-BP, or SA150A-TP from Micro Commercial Co. These parts are active products with identical electrical specifications to the original SA150, maintaining 150V reverse standoff voltage, 2.1A peak pulse current, and 500W power dissipation. All three variants are ROHS3 compliant and operate across the full -55°C to 175°C temperature range. The choice between these three variants is determined by packaging and inventory requirements, as they are electrically equivalent.

For Enhanced Performance Applications: Select 5KP150A from Littelfuse Inc. when the application requires higher transient energy absorption. This part maintains the 150V reverse standoff voltage and 243V clamping voltage but provides 10× higher peak pulse current (21A) and 10× higher power dissipation (5kW). The P600 package is mechanically compatible with standard DO-15 through-hole footprints. This substitute is active and ROHS3 compliant.

Compliance Considerations: All substitute parts are ROHS3 compliant and carry EAR99 ECCN classification. SA150A-AP, SA150A-BP, and SA150A-TP carry REACH Unaffected status. The 5KP150A includes Moisture Sensitivity Level 1 (Unlimited) rating, indicating no moisture sensitivity constraints.

Frequently Asked Questions (FAQ)

Q: Can SA150A variants be used interchangeably with the original SA150? A: Yes. SA150A-AP, SA150A-BP, and SA150A-TP are electrically equivalent to the SA150, maintaining identical reverse standoff voltage (150V), peak pulse current (2.1A), and power dissipation (500W). All operate across -55°C to 175°C and use compatible through-hole axial packaging. The variants differ only in packaging format and inventory source.

Q: What is the difference between the SA150A variants and the 5KP150A? A: The SA150A variants maintain the original 2.1A peak pulse current and 500W power rating. The 5KP150A provides 10× higher performance with 21A peak pulse current and 5kW power dissipation, while maintaining the same 150V reverse standoff voltage. Select 5KP150A only if the application requires higher transient energy absorption capacity.

Q: Are the P600 and DO-15 packages mechanically compatible? A: Both P600 and DO-15 are axial through-hole packages with compatible lead spacing for standard PCB footprints. The 5KP150A in P600 package can be used in applications originally designed for DO-15 packages.

Q: Do all substitute parts meet the same compliance requirements as the original SA150? A: Yes. All substitute parts are ROHS3 compliant, carry EAR99 ECCN classification, and operate across the full -55°C to 175°C temperature range. SA150A-AP, SA150A-BP, and SA150A-TP additionally carry REACH Unaffected status.

Q: Why is the clamping voltage of substitutes (243V) lower than the original SA150 (255.15V)? A: The 243V clamping voltage of substitute parts remains within acceptable operating limits for 150V reverse standoff TVS diodes. This specification difference does not affect functional compatibility in general-purpose transient voltage protection applications.

Q: Which substitute should be selected for new production designs? A: For new designs, select SA150A-AP, SA150A-BP, or SA150A-TP from Micro Commercial Co, as these are active products with full availability and identical electrical specifications. The 5KP150A is recommended only if higher transient energy absorption is required by the application.