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SA150A Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts
Part Overview
The SA150A is a unidirectional Zener-type transient voltage suppressor diode manufactured by onsemi, designed for general-purpose overvoltage protection applications. The device features a 150V reverse standoff voltage with a 243V maximum clamping voltage at peak pulse current of 2.1A and 500W peak pulse power dissipation. The SA150A is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 150 | V |
| Voltage - Breakdown (Min) | 167 | V |
| Voltage - Clamping (Max) @ Ipp | 243 | V |
| Current - Peak Pulse (10/1000µs) | 2.1 | A |
| Power - Peak Pulse | 500 | W |
| Type | Zener | - |
| Unidirectional Channels | 1 | - |
| Mounting Type | Through Hole | - |
| Package / Case | DO-204AC, DO-15, Axial | - |
| Applications | General Purpose | - |
Substitute Part Grouping Explanation
Substitute parts for the SA150A are classified into two categories based on electrical and mechanical parameter alignment:
Direct Manufacturer Substitutes maintain identical electrical specifications (150V standoff, 167V breakdown minimum, 243V clamping maximum, 2.1A peak pulse current, 500W peak pulse power) and package configuration (DO-15/DO-204AC through-hole axial). These parts are interchangeable at the circuit level:
- SA150A-AP (Micro Commercial Co)
- SA150A-BP (Micro Commercial Co)
- SA150A-E3/54 (Vishay General Semiconductor - Diodes Division)
- SA150AHE3/54 (Vishay General Semiconductor - Diodes Division, automotive-qualified)
- SA150AHE3/73 (Vishay General Semiconductor - Diodes Division, automotive-qualified)
- SA150A-TP (Micro Commercial Co)
- SA150A (Fairchild Semiconductor, obsolete status)
Similar Manufacturer Substitutes maintain identical electrical specifications and package configuration but carry different base product designations (P5KE series):
- P5KE150A-AP (Micro Commercial Co)
- P5KE150A-BP (Micro Commercial Co)
- P5KE150A-TP (Micro Commercial Co)
All substitute parts share the critical electrical parameters that define functional equivalence: 150V reverse standoff voltage, 167V minimum breakdown voltage, 243V maximum clamping voltage, 2.1A peak pulse current, and 500W peak pulse power rating.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Standoff Voltage (V) | Breakdown Min (V) | Clamping Max (V) | Peak Pulse Current (A) | Peak Pulse Power (W) | Operating Temp (°C) | Package | Inventory (Pcs) |
|---|---|---|---|---|---|---|---|---|---|---|
| SA150A | onsemi | Obsolete | 150 | 167 | 243 | 2.1 | 500 | - | DO-15 | 983 |
| SA150A-AP | Micro Commercial Co | Active | 150 | 167 | 243 | 2.1 | 500 | -55 to 175 | DO-15 | 843 |
| SA150A-BP | Micro Commercial Co | Active | 150 | 167 | 243 | 2.1 | 500 | -55 to 175 | DO-15 | 796 |
| SA150A-E3/54 | Vishay General Semiconductor | Active | 150 | 167 | 243 | 2.1 | 500 | -55 to 175 | DO-204AC | 4303 |
| SA150AHE3/54 | Vishay General Semiconductor | Active | 150 | 167 | 243 | 2.1 | 500 | -55 to 175 | DO-204AC | 672 |
| SA150AHE3/73 | Vishay General Semiconductor | Active | 150 | 167 | 243 | 2.1 | 500 | -55 to 175 | DO-204AC | 768 |
| SA150A-TP | Micro Commercial Co | Active | 150 | 167 | 243 | 2.1 | 500 | -55 to 175 | DO-15 | 656 |
| P5KE150A-AP | Micro Commercial Co | Active | 150 | 167 | 243 | 2.1 | 500 | -65 to 175 | DO-15 | 772 |
| P5KE150A-BP | Micro Commercial Co | Active | 150 | 167 | 243 | 2.1 | 500 | -65 to 175 | DO-15 | 690 |
| P5KE150A-TP | Micro Commercial Co | Active | 150 | 167 | 243 | 2.1 | 500 | -65 to 175 | DO-15 | 742 |
| SA150A | Fairchild Semiconductor | Obsolete | 150 | 167 | 243 | 2.1 | 500 | -55 to 175 | DO-204AC | 16583 |
Engineering Selection Recommendations
For Active Production Designs: Select from active-status parts with established supply chains. Vishay SA150A-E3/54 and SA150AHE3/54 offer the highest inventory availability (4303 and 672 units respectively) and are RoHS3 compliant. The SA150AHE3/54 variant includes AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade reliability.
For General-Purpose Applications: Micro Commercial Co SA150A-AP, SA150A-BP, and SA150A-TP provide active-status equivalents with identical electrical specifications and standard operating temperature range (-55°C to 175°C). These parts are suitable for non-automotive general-purpose overvoltage protection.
For Extended Low-Temperature Operation: P5KE150A series parts (P5KE150A-AP, P5KE150A-BP, P5KE150A-TP) extend the minimum operating temperature to -65°C, providing enhanced performance in extreme cold environments while maintaining all other electrical parameters.
Package Consideration: DO-15 packaged parts (SA150A-AP, SA150A-BP, SA150A-TP, P5KE150A variants) are directly pin-compatible with the original SA150A. DO-204AC packaged parts (Vishay variants) are mechanically equivalent but require PCB layout verification for axial lead spacing.
Obsolete Part Replacement: The original onsemi SA150A (obsolete) should be replaced with active-status equivalents. Fairchild Semiconductor SA150A (also obsolete) should not be selected for new designs despite high inventory levels.
Frequently Asked Questions (FAQ)
Q: Can SA150A-E3/54 replace SA150A in existing designs? A: Yes. Both parts maintain identical electrical specifications (150V standoff, 243V clamping, 2.1A peak pulse current, 500W peak power). The SA150A-E3/54 uses DO-204AC packaging (equivalent to DO-15 axial configuration). PCB layout verification is required to confirm lead spacing compatibility.
Q: What is the difference between SA150AHE3/54 and SA150A-E3/54? A: Both parts are electrically identical with matching electrical parameters and operating temperature range (-55°C to 175°C). SA150AHE3/54 includes AEC-Q101 automotive qualification and is supplied in Tape & Reel packaging, while SA150A-E3/54 is supplied in Cut Tape packaging. Select SA150AHE3/54 for automotive applications requiring qualification documentation.
Q: Are P5KE150A parts direct replacements for SA150A? A: P5KE150A parts maintain identical electrical specifications and through-hole DO-15 packaging, making them functionally equivalent. The P5KE series carries a different manufacturer designation but shares the same 150V standoff, 243V clamping, and 2.1A peak pulse current specifications. Operating temperature extends to -65°C minimum, providing enhanced low-temperature performance.
Q: Which substitute part has the best availability? A: Vishay SA150A-E3/54 offers the highest inventory (4303 units), followed by Fairchild SA150A (16583 units, obsolete status). For active-status parts, SA150A-E3/54 is the preferred choice for immediate procurement.
Q: Can I use SA150A in new designs? A: No. The original onsemi SA150A is classified as obsolete. Select active-status equivalents such as SA150A-AP, SA150A-BP, SA150A-E3/54, or P5KE150A variants for new designs to ensure long-term supply chain continuity.
Q: What packaging options are available? A: All substitute parts use through-hole axial packaging. DO-15 variants (SA150A-AP, SA150A-BP, SA150A-TP, P5KE150A series) and DO-204AC variants (Vishay SA150A-E3/54, SA150AHE3/54, SA150AHE3/73) are mechanically equivalent. Verify PCB lead spacing requirements before selecting packaging variant.
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