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5KP22-B Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts
Part Overview
The 5KP22-B is a unidirectional transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 22V reverse standoff voltage, 37.28V maximum clamping voltage, and 5000W peak pulse power rating in a P600 axial through-hole package. The part is currently listed as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within specified electrical and mechanical parameters.
Substiute Parts
Key Parameters
| Parameter | 5KP22-B | Unit |
|---|---|---|
| Manufacturer | Littelfuse Inc. | — |
| Part Number | 5KP22-B | — |
| Product Status | Obsolete | — |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
| Voltage - Reverse Standoff (Typ) | 22 | V |
| Voltage - Breakdown (Min) | 22.91 | V |
| Voltage - Clamping (Max) @ Ipp | 37.28 | V |
| Power - Peak Pulse | 5000 | W |
| Operating Temperature Range | -55 to 175 | °C |
| Mounting Type | Through Hole | — |
| Package / Case | P600, Axial | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution of the 5KP22-B is determined by the following critical parameters:
Primary Substitution Criteria:
- Voltage - Reverse Standoff (Typ): 22V nominal
- Voltage - Clamping (Max) @ Ipp: 35.5V to 39.4V range
- Power - Peak Pulse: 5000W (5kW) rating
- Unidirectional operation (single channel)
- Through-hole axial mounting
- Operating temperature range: -55°C to 175°C minimum
Secondary Compatibility Factors:
- Package type: P600 preferred for direct mechanical replacement; DO-201 and DO-15 packages acceptable with board layout modification
- RoHS3 compliance required for new designs
- Zener diode type maintained across all substitutes
Substitutes are grouped into three categories based on package compatibility and power rating alignment:
- Direct P600 Package Replacements (5KP22A, 5KP22A-B, SLD22U-017-B, 5KP22E3/TR13): Maintain identical 5000W power rating and P600 package for direct board substitution
- Lower Power Alternatives (1.5KE22A, 1.5KE24A, 1.5KE27A): Reduced to 1500W power rating in DO-201 package; suitable for lower-stress applications
- Minimal Power Alternatives (P6KE24A, P6KE27A, SA20A): 500-600W power rating in DO-15 package; limited to low-energy transient suppression
Parameter Comparison
| Part Number | Manufacturer | Status | Reverse Standoff (V) | Clamping Max (V) | Peak Power (W) | Package | Temp Range (°C) | RoHS |
|---|---|---|---|---|---|---|---|---|
| 5KP22-B | Littelfuse | Obsolete | 22 | 37.28 | 5000 | P600 | -55 to 175 | ROHS3 |
| 5KP22A | Diotec | Active | 22 | 35.5 | 5000 | P600 | -50 to 175 | N/A |
| 5KP22A-B | Littelfuse | Active | 22 | 35.5 | 5000 | P600 | -55 to 175 | ROHS3 |
| 1.5KE22A | Taiwan Semiconductor | Active | 18.8 | 30.6 | 1500 | DO-201 | -55 to 175 | ROHS3 |
| 1.5KE24A | Taiwan Semiconductor | Active | 20.5 | 33.2 | 1500 | DO-201 | -55 to 175 | ROHS3 |
| 1.5KE27A | Taiwan Semiconductor | Active | 23.1 | 37.5 | 1500 | DO-201 | -55 to 175 | ROHS3 |
| P6KE24A | Fairchild | Active | 20.5 | 33.2 | 600 | DO-15 | -50 to 175 | — |
| P6KE27A | Fairchild | Active | 23.1 | 37.5 | 600 | DO-15 | -50 to 175 | — |
| SA20A | Fairchild | Obsolete | 20 | 32.4 | 500 | DO-15 | -55 to 175 | ROHS3 |
| SLD22U-017-B | Littelfuse | Active | 22 | 35.5 | 5000 | P600 | -55 to 175 | ROHS3 |
| 5KP22E3/TR13 | Microchip | Active | 22 | 39.4 | 5000 | P600 | -55 to 175 | ROHS3 |
Engineering Selection Recommendations
Preferred Direct Replacements (P600 Package, 5000W):
5KP22A-B (Littelfuse) and SLD22U-017-B (Littelfuse) are the primary recommended substitutes. Both maintain identical electrical specifications, package form factor, and operating temperature range as the obsolete 5KP22-B. Both are ROHS3 compliant and currently in active production status. 5KP22A-B is available in bulk packaging with 1053 units in stock, while SLD22U-017-B includes AEC-Q101 automotive qualification with 830 units available.
5KP22E3/TR13 (Microchip) provides equivalent 5000W power handling in P600 package with slightly elevated clamping voltage (39.4V vs. 37.28V). This part is ROHS3 compliant and active, with 688 units in stock. Tape & Reel packaging suits automated assembly processes.
5KP22A (Diotec) maintains 5000W power and P600 package with 8804 units in stock. Operating temperature minimum is -50°C versus -55°C for the original part. RoHS status is not applicable for this manufacturer.
Alternative Substitutes (Reduced Power Rating):
1.5KE22A, 1.5KE24A, and 1.5KE27A (Taiwan Semiconductor) reduce peak pulse power to 1500W and require package change to DO-201 axial. These parts are ROHS3 compliant and active. Selection among these three depends on voltage matching: 1.5KE22A aligns closest to the 22V standoff specification, while 1.5KE27A provides clamping voltage (37.5V) nearest to the original 37.28V specification.
Minimal Power Alternatives (Not Recommended for Direct Replacement):
P6KE24A and P6KE27A (Fairchild) reduce power to 600W and require DO-15 package change. These are suitable only for applications with significantly reduced transient energy requirements. SA20A (Fairchild) is obsolete and should not be selected for new designs despite ROHS3 compliance.
Frequently Asked Questions (FAQ)
Q: Can 5KP22A-B directly replace 5KP22-B without board modification?
A: Yes. Both components use identical P600 axial through-hole package, 22V reverse standoff voltage, 35.5V clamping voltage, and 5000W peak pulse power rating. No board layout changes are required. Operating temperature ranges are identical (-55°C to 175°C).
Q: What is the difference between 5KP22A-B and SLD22U-017-B?
A: Both are Littelfuse products with identical electrical specifications and P600 packaging. SLD22U-017-B includes AEC-Q101 automotive qualification and is designated for automotive-grade applications. 5KP22A-B is general-purpose rated. Selection depends on application requirements.
Q: Can I use 1.5KE22A as a substitute if my application has lower transient energy?
A: 1.5KE22A is electrically compatible (22V standoff, 30.6V clamping) but reduces peak pulse power from 5000W to 1500W and requires board modification for DO-201 package. Use only if application transient energy is confirmed below 1500W peak pulse rating.
Q: Why is SA20A listed as a substitute if it is obsolete?
A: SA20A is included for reference in legacy system documentation. It should not be selected for new designs. Active alternatives with superior availability are available.
Q: What is the impact of using 5KP22E3/TR13 with 39.4V clamping versus the original 37.28V?
A: The 2.12V increase in maximum clamping voltage remains within acceptable transient suppression performance for general-purpose applications. This part maintains all other critical parameters: 22V standoff, 5000W power, P600 package, and -55°C to 175°C operating range.
Q: Are all recommended substitutes RoHS3 compliant?
A: 5KP22A-B, SLD22U-017-B, 5KP22E3/TR13, 1.5KE22A, 1.5KE24A, and 1.5KE27A are ROHS3 compliant. 5KP22A (Diotec) has not applicable RoHS status. P6KE24A and P6KE27A (Fairchild) do not specify RoHS compliance. Verify compliance requirements for your application before selection.
Q: What is the minimum operating temperature difference between substitutes?
A: Most substitutes maintain -55°C minimum operating temperature. 5KP22A (Diotec) and P6KE24A/P6KE27A (Fairchild) specify -50°C minimum. For applications requiring -55°C operation, select 5KP22A-B, SLD22U-017-B, 5KP22E3/TR13, or the 1.5KE series.
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