Request Quote
(Ships tomorrow)
20KPA256C-B Equivalent & Substitute Parts
Part Overview
The 20KPA256C-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 256V reverse standoff voltage with a 432.6V maximum clamping voltage and 49A peak pulse current capability in a through-hole P600 axial package. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Voltage - Reverse Standoff (Typ) | 256V |
| Voltage - Breakdown (Min) | 270.27V |
| Voltage - Clamping (Max) @ Ipp | 432.6V |
| Current - Peak Pulse (10/1000µs) | 49A |
| Power - Peak Pulse | 20000W (20kW) |
| Operating Temperature | -55°C ~ 175°C (TJ) |
| Mounting Type | Through Hole |
| Package / Case | P600, Axial |
| Type | Zener |
| Bidirectional Channels | 1 |
Substitute Part Grouping Explanation
Substitution for the 20KPA256C-B is determined by the following critical parameters: reverse standoff voltage (256V), bidirectional channel configuration (1 channel), zener type, through-hole mounting, and operating temperature range (-55°C to 175°C). The substitute parts are grouped into two categories based on package compatibility and electrical performance characteristics.
Category 1: Direct Package Equivalents (P600 Axial) Parts maintaining the original P600 axial package format with matching voltage specifications and 49A peak pulse current rating.
Category 2: Alternative Package Substitutes (DO-201 Axial) Parts with different package formats (DO-201/DO-201AE) that maintain core voltage protection parameters but with reduced peak pulse current capability (3.8A) and lower peak pulse power (1500W).
Parameter Comparison
| Parameter | 20KPA256C-B (Main) | 20KPA256CA-B | 20KPA256CA | 1.5KE300CA | 1.5KE300CA-TP |
|---|---|---|---|---|---|
| Manufacturer | Littelfuse Inc. | Littelfuse Inc. | MDE Semiconductor Inc | Taiwan Semiconductor Corporation | Micro Commercial Co |
| Product Status | Obsolete | Active | Active | Active | Active |
| Voltage - Reverse Standoff (Typ) | 256V | 256V | 256V | 256V | 256V |
| Voltage - Breakdown (Min) | 270.27V | 286V | 286V | 285V | 285V |
| Voltage - Clamping (Max) @ Ipp | 432.6V | 412V | 412V | 414V | 414V |
| Current - Peak Pulse (10/1000µs) | 49A | 49A | 49A | 3.8A | Not Specified |
| Power - Peak Pulse | 20000W (20kW) | 20000W (20kW) | 20000W (20kW) | 1500W (1.5kW) | 1500W (1.5kW) |
| Operating Temperature | -55°C ~ 175°C (TJ) | -55°C ~ 175°C (TJ) | -55°C ~ 175°C (TJ) | -55°C ~ 175°C (TJ) | -55°C ~ 175°C (TJ) |
| Package / Case | P600, Axial | P600, Axial | P600, Axial | DO-201AA, DO-27, Axial | DO-201AE, Axial |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Substitutes (Recommended for Direct Replacement):
20KPA256CA-B (Littelfuse Inc.) and 20KPA256CA (MDE Semiconductor Inc) are the preferred substitutes. Both parts maintain the P600 axial package format, identical 49A peak pulse current rating, and 20kW peak pulse power specification. These parts are in active product status with full RoHS3 compliance and REACH unaffected certification. The 20KPA256CA-B offers the advantage of Littelfuse original manufacturer continuity.
Secondary Substitutes (Alternative Package Options):
1.5KE300CA (Taiwan Semiconductor Corporation) and 1.5KE300CA-TP (Micro Commercial Co) provide voltage protection within the same 256V reverse standoff specification but utilize DO-201 series axial packages. These parts are suitable only for applications where peak pulse current requirements do not exceed 3.8A and peak pulse power does not exceed 1500W. Both maintain active product status with full RoHS3 compliance and REACH unaffected certification.
Frequently Asked Questions (FAQ)
Q: Can 20KPA256CA-B directly replace 20KPA256C-B in existing designs?
A: Yes. The 20KPA256CA-B maintains identical electrical specifications (256V reverse standoff, 49A peak pulse current, 20kW peak pulse power) and package format (P600 axial). The primary difference is product status transition from obsolete to active.
Q: What is the key difference between P600 and DO-201 package substitutes?
A: The P600 package (20KPA256CA-B, 20KPA256CA) supports 49A peak pulse current and 20kW peak pulse power. The DO-201 package (1.5KE300CA, 1.5KE300CA-TP) is rated for 3.8A peak pulse current and 1500W peak pulse power. Package selection depends on application current and power requirements.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All substitute parts listed (20KPA256CA-B, 20KPA256CA, 1.5KE300CA, 1.5KE300CA-TP) are RoHS3 compliant and REACH unaffected.
Q: What is the voltage clamping difference between the main part and substitutes?
A: The 20KPA256C-B specifies 432.6V maximum clamping voltage. The substitute parts specify 412V (20KPA256CA-B, 20KPA256CA) or 414V (1.5KE300CA, 1.5KE300CA-TP) maximum clamping voltage. All values remain within acceptable transient suppression parameters for 256V standoff applications.
Q: Can 1.5KE300CA-TP be used in high-current pulse applications?
A: No. The 1.5KE300CA-TP is rated for 1500W peak pulse power with unspecified peak pulse current. Applications requiring 49A peak pulse current and 20kW peak pulse power must use 20KPA256CA-B or 20KPA256CA.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts