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Equivalent & Substitute Parts for 1N6281A-E3/51
Part Overview
The 1N6281A-E3/51 is a unidirectional Transient Voltage Suppressor (TVS) diode from the Vishay TransZorb® series, designed for general-purpose transient voltage protection applications. This component operates with a reverse standoff voltage of 23.1V and provides clamping at 37.5V with a peak pulse current rating of 40A. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for continued system support and new designs.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 23.1 | V |
| Voltage - Breakdown (Min) | 25.7 | V |
| Voltage - Clamping (Max) @ Ipp | 37.5 | V |
| Current - Peak Pulse (10/1000µs) | 40 | A |
| Power - Peak Pulse | 1500 | W |
| Operating Temperature Range | -55 to 175 | °C (TJ) |
| Mounting Type | Through Hole | — |
| Package / Case | DO-201AA, DO-27, Axial | — |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the 1N6281A-E3/51 is determined by strict equivalence across the following electrical and mechanical parameters:
- Voltage - Reverse Standoff (Typ): 23.1V
- Voltage - Breakdown (Min): 25.7V
- Voltage - Clamping (Max) @ Ipp: 37.5V
- Current - Peak Pulse (10/1000µs): 40A minimum
- Power - Peak Pulse: 1500W
- Operating Temperature Range: -55°C to 175°C
- Mounting Type: Through Hole
- Package / Case: DO-201AA, DO-27, or Axial equivalent
- Type: Zener, Unidirectional (1 channel)
- RoHS Status: ROHS3 Compliant
Substitute parts are grouped into two categories: direct Vishay equivalents with identical specifications and active alternatives from other manufacturers that meet all electrical parameters within the specified tolerances.
Parameter Comparison
| Part Number | Manufacturer | VWM (V) | VBR Min (V) | VC Max (V) | Ipp (A) | PPP (W) | Temp Range (°C) | Status | Packaging |
|---|---|---|---|---|---|---|---|---|---|
| 1N6281A-E3/51 | Vishay | 23.1 | 25.7 | 37.5 | 40 | 1500 | -55 to 175 | Obsolete | — |
| 1N6281A-E3/54 | Vishay | 23.1 | 25.7 | 37.5 | 40 | 1500 | -55 to 175 | Active | Tape & Reel (TR) |
| 1.5KE27A-E3/54 | Vishay | 23.1 | 25.7 | 37.5 | 40 | 1500 | -55 to 175 | Active | Cut Tape (CT) |
| 1.5KE27AHE3_A/C | Vishay | 23.1 | 25.7 | 37.5 | 40 | 1500 | -55 to 175 | Active | Cut Tape (CT) |
| 1N6281A-E3/73 | Vishay | 23.1 | 25.7 | 37.5 | 40 | 1500 | -55 to 175 | Active | Tape & Box (TB) |
| 1N6281AHE3_A/C | Vishay | 23.1 | 25.7 | 37.5 | 40 | 1500 | -55 to 175 | Active | — |
| 1.5KE27A | Taiwan Semiconductor | 23.1 | 25.7 | 37.5 | 42 | 1500 | -55 to 175 | Active | Cut Tape (CT) |
| 1.5KE27A-HF | Comchip Technology | 23.1 | 25.65 | 37.5 | 40 | 1500 | -55 to 150 | Active | Tape & Box (TB) |
| 1V5KE27A | Taiwan Semiconductor | 23.1 | 25.7 | 37.5 | 40 | 1500 | -55 to 175 | Active | Tape & Reel (TR) |
Engineering Selection Recommendations
Primary Recommendation: 1N6281A-E3/54 (Vishay)
This part is the manufacturer-recommended direct replacement for the obsolete 1N6281A-E3/51. It maintains identical electrical specifications and RoHS3 compliance. The primary difference is packaging format (Tape & Reel vs. unspecified original packaging), which does not affect electrical performance or mechanical compatibility in through-hole applications.
Secondary Recommendations:
1.5KE27A-E3/54 and 1.5KE27AHE3_A/C (Vishay) are functionally equivalent alternatives with active product status. The automotive-qualified variant (1.5KE27AHE3_A/C) carries AEC-Q101 certification and is suitable for applications requiring automotive-grade reliability.
Alternative Manufacturers:
1.5KE27A (Taiwan Semiconductor) and 1V5KE27A (Taiwan Semiconductor) meet all electrical parameters with active status. The 1.5KE27A variant provides a peak pulse current of 42A, exceeding the 40A minimum requirement. Both maintain the full -55°C to 175°C operating temperature range and RoHS3 compliance.
1.5KE27A-HF (Comchip Technology) is electrically compatible but operates to a maximum junction temperature of 150°C, which is 25°C lower than the original specification. This part is suitable only for applications where the reduced temperature rating does not present a constraint.
Frequently Asked Questions (FAQ)
Q: Can I use 1.5KE27A (Taiwan Semiconductor) as a direct replacement for 1N6281A-E3/51?
A: Yes. The 1.5KE27A meets all critical electrical parameters: 23.1V reverse standoff voltage, 37.5V clamping voltage, and 40A peak pulse current (with 42A available). It maintains the same operating temperature range (-55°C to 175°C), through-hole mounting, and RoHS3 compliance. The higher peak pulse current rating provides additional margin.
Q: What is the difference between 1N6281A-E3/54 and 1.5KE27A-E3/54?
A: Both are Vishay products with identical electrical specifications. The primary difference is the base product designation (1N6281 vs. 1.5KE27), which reflects different product lines within the TransZorb® series. Electrically and mechanically, they are equivalent for this application.
Q: Is the automotive-qualified variant 1.5KE27AHE3_A/C suitable for non-automotive applications?
A: Yes. The AEC-Q101 qualification indicates enhanced reliability testing and is a superset of standard requirements. This part can be used in any application requiring the specified electrical parameters and is particularly valuable where higher reliability margins are desired.
Q: Why does 1.5KE27A-HF have a lower maximum operating temperature?
A: The 1.5KE27A-HF from Comchip Technology is specified to -55°C to 150°C (TJ), compared to -55°C to 175°C for other equivalents. This 25°C reduction in maximum junction temperature may limit its use in high-temperature environments. Verify that your application's thermal conditions remain within this narrower range before selection.
Q: Are all substitute parts available in the same DO-201AA/DO-27 axial package?
A: All substitute parts listed are through-hole mounted in axial packages compatible with DO-201AA or DO-27 footprints. Packaging format variations (Cut Tape, Tape & Reel, Tape & Box) affect supply and handling but do not alter electrical performance or mechanical fit in circuit board applications.
Q: What is the inventory status for these substitute parts?
A: Inventory levels are provided in the source data. 1N6281A-E3/54 has 3,326 pieces in stock. 1.5KE27A (Taiwan Semiconductor) has the highest availability at 30,100 pieces. Verify current stock with your supplier before finalizing procurement decisions.
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