SA150A Equivalent & Substitute Parts

Part Overview

The SA150A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient protection applications. This through-hole component operates across a temperature range of -55°C to 175°C and is RoHS3 compliant. The part is currently in active production status. Equivalent and substitute parts are identified when component availability is limited, procurement lead times are extended, or design flexibility permits selection from qualified alternatives that maintain electrical and mechanical compatibility.

Substiute Parts

SA150A

Littelfuse Inc.In Stock: 716SA150A Datasheet

Current PartRFQ

5KP150A

Littelfuse Inc.In Stock: 33925KP150A Datasheet

MFR RecommendedRFQ

SA150A-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 4381SA150A-E3/54 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SA150A are qualified based on the following criteria:

Electrical Parameters (Critical for Substitution):

• Voltage - Reverse Standoff (Typ): 150V
• Voltage - Breakdown (Min): 167V
• Voltage - Clamping (Max) @ Ipp: 243V
• Operating Temperature Range: -55°C to 175°C (TJ)
• Type: Zener, Unidirectional (1 channel)

Mechanical Parameters (Required for Physical Compatibility):

• Mounting Type: Through Hole
• Package / Case: DO-204AC (DO-15), Axial configuration

Compliance & Status:

• Product Status: Active
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

Substitutes are grouped into two categories:

Category 1 - Direct Electrical & Package Equivalent (SA150A-E3/54): Identical electrical specifications and package configuration. Manufactured by Vishay General Semiconductor - Diodes Division under the TransZorb® series. Maintains all critical parameters within the same tolerance bands.

Category 2 - Higher Current Rating Variant (5KP150A): Maintains identical voltage specifications (150V standoff, 167V breakdown, 243V clamping) and operating temperature range. Differs in current-handling capability (21A peak pulse vs. 2.1A) and power dissipation (5kW vs. 500W). Package configuration is P600 (axial through-hole). This variant is suitable for applications requiring higher transient current capacity while maintaining the same voltage protection threshold.

Parameter Comparison

Engineering Selection Recommendations

SA150A-E3/54 Selection Criteria: This substitute is recommended when direct replacement with identical electrical and mechanical specifications is required. Both the SA150A and SA150A-E3/54 maintain the same voltage protection thresholds (150V standoff, 243V clamping) and current handling (2.1A peak pulse). Both are RoHS3 compliant, active production status, and feature DO-204AC (DO-15) axial through-hole packaging. Selection between these two parts depends on supplier availability, lead time, and procurement cost considerations.

5KP150A Selection Criteria: This substitute is applicable in designs where higher transient current capacity is beneficial or required. The 5KP150A maintains identical voltage specifications but provides 10 times greater peak pulse current (21A vs. 2.1A) and 10 times greater power dissipation capability (5kW vs. 500W). The P600 package is a larger axial through-hole form factor. This part is suitable for applications experiencing higher-energy transient events while maintaining the same voltage clamping performance. Selection requires verification that the P600 package dimensions are compatible with the circuit board layout and that the increased component size does not conflict with mechanical constraints.

All three parts are RoHS3 compliant, carry unlimited moisture sensitivity level (MSL 1), and operate across the full -55°C to 175°C temperature range.

Frequently Asked Questions (FAQ)

Q: Can SA150A-E3/54 be used as a direct drop-in replacement for SA150A? A: Yes. Both parts share identical electrical specifications (150V standoff, 167V breakdown, 243V clamping, 2.1A peak pulse) and the same DO-204AC (DO-15) axial through-hole package configuration. No circuit modifications are required.

Q: When should 5KP150A be selected instead of SA150A? A: The 5KP150A is selected when the application experiences transient events with peak currents exceeding 2.1A or when higher energy absorption capacity (5kW vs. 500W) is required. The voltage protection thresholds remain identical. Physical board space must accommodate the larger P600 package.

Q: Are all three parts pin-compatible? A: SA150A and SA150A-E3/54 are pin-compatible due to identical DO-204AC (DO-15) axial packaging. The 5KP150A uses P600 axial packaging, which has the same two-lead axial configuration but larger physical dimensions. Electrical polarity is identical across all three parts.

Q: What is the difference between DO-204AC and P600 packages? A: Both are axial through-hole packages with two leads. DO-204AC (DO-15) is a smaller form factor, while P600 is a larger package designed for higher power dissipation applications. Both maintain the same lead spacing and axial orientation for through-hole mounting.

Q: Are all substitute parts RoHS3 compliant? A: Yes. SA150A, SA150A-E3/54, and 5KP150A are all RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Q: Can these parts be used interchangeably in existing designs? A: SA150A and SA150A-E3/54 are fully interchangeable. The 5KP150A requires board layout verification due to its larger P600 package size, but electrical substitution is valid for applications where higher current capacity is acceptable or beneficial.