3KP90A-B Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The 3KP90A-B is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 90V reverse standoff voltage with a 146V maximum clamping voltage and 20.5A peak pulse current capability in a through-hole P600 axial package. The product is currently obsolete, necessitating identification of functionally equivalent alternatives from active product lines that maintain electrical and mechanical compatibility for circuit protection applications.

Key Parameters

Parameter	3KP90A-B
Manufacturer	Littelfuse Inc.
Type	Zener TVS Diode
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	90V
Voltage - Breakdown (Min)	100V
Voltage - Clamping (Max) @ Ipp	146V
Current - Peak Pulse (10/1000µs)	20.5A
Power - Peak Pulse	3000W (3kW)
Operating Temperature	-55°C ~ 175°C (TJ)
Mounting Type	Through Hole
Package / Case	P600, Axial
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 3KP90A-B is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Voltage - Reverse Standoff (Typ): 90V nominal
Voltage - Clamping (Max) @ Ipp: 146V maximum
Unidirectional configuration (single channel)
Operating temperature range: -55°C to 175°C minimum
Through-hole mounting requirement

Mechanical Compatibility Criteria:

Through-hole axial package configuration
Physical form factor compatibility with P600, R-6, or DO-201 packages

Substitute parts are grouped into two categories based on package compatibility:

Category 1 - Direct Package Match (P600/R-6 Axial): Parts maintaining identical or compatible axial through-hole packages with matching voltage and current specifications.

Category 2 - Functional Equivalent (Alternative Axial Packages): Parts with equivalent electrical performance but different through-hole axial package designations (DO-201, DO-15), suitable where mechanical footprint adaptation is acceptable.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Product Status	Operating Temperature
3KP90A-B	Littelfuse Inc.	90V	146V	20.5A	3000W	P600, Axial	Obsolete	-55°C ~ 175°C
5KP90A-B	Littelfuse Inc.	90V	146V	34.9A	5000W	P600, Axial	Active	-55°C ~ 175°C
3KP90A-TP	Micro Commercial Co	90V	146V	20.5A	3000W	R-6, Axial	Active	-55°C ~ 175°C
15KP90A-TP	Micro Commercial Co	90V	146V	—	15000W	R-6, Axial	Active	-55°C ~ 175°C
1.5KE100A	Taiwan Semiconductor Corporation	85.5V	137V	11.4A	1500W	DO-201AA, Axial	Active	-55°C ~ 175°C
1.5KE110A	Taiwan Semiconductor Corporation	94V	152V	10.3A	1500W	DO-201AA, Axial	Active	-55°C ~ 175°C
1.5KE91A	Taiwan Semiconductor Corporation	77.8V	125V	12.6A	1500W	DO-201AA, Axial	Active	-55°C ~ 175°C
P6KE100A	Fairchild Semiconductor	100V	137V	4.4A	600W	DO-204AC, Axial	Active	-55°C ~ 150°C
1.5KE100A-AP	Micro Commercial Co	85.5V	137V	11.1A	1500W	DO-201AE, Axial	Active	-55°C ~ 175°C
P4KE110A-TP	Micro Commercial Co	94V	152V	2.7A	400W	DO-204AL, Axial	Active	-55°C ~ 175°C
1N6295A-E3/54	Vishay General Semiconductor	85.5V	137V	10.9A	1500W	DO-201AA, Axial	Active	-55°C ~ 175°C

Engineering Selection Recommendations

Primary Recommendation - Direct Replacement: The 5KP90A-B from Littelfuse Inc. provides the most direct substitution path. It maintains identical voltage specifications (90V reverse standoff, 146V clamping), identical package form factor (P600 axial), and full operating temperature range (-55°C to 175°C). The higher peak pulse current (34.9A vs. 20.5A) and power rating (5000W vs. 3000W) provide enhanced protection margin. Product status is active with ROHS3 compliance maintained.

Secondary Recommendation - Equivalent Performance, Alternative Package: The 3KP90A-TP from Micro Commercial Co delivers identical electrical specifications (90V standoff, 146V clamping, 20.5A peak pulse, 3000W power) with active product status and full temperature range support. The R-6 axial package is mechanically compatible with through-hole mounting, though physical dimensions differ from the P600 package. ROHS3 compliance is maintained.

Higher Power Density Option: The 15KP90A-TP from Micro Commercial Co maintains the critical voltage parameters (90V standoff, 146V clamping) with significantly elevated power handling (15000W). This option is suitable for applications requiring enhanced transient energy absorption. R-6 axial package configuration applies.

Lower Power Alternatives for Reduced Transient Energy: The 1.5KE series (1.5KE100A, 1.5KE110A, 1.5KE91A) from Taiwan Semiconductor Corporation and equivalent parts from Micro Commercial Co and Vishay provide functional protection with reduced power dissipation (1500W). These components operate within the voltage window but with lower peak pulse current ratings. DO-201 axial packages require mechanical footprint verification.

Compliance Verification: All recommended substitutes maintain ROHS3 compliance and operate across the -55°C to 175°C temperature range. The 1N6295A-E3/54 from Vishay includes AEC-Q101 automotive qualification for applications requiring automotive-grade components.

Frequently Asked Questions (FAQ)

Q: Can the 5KP90A-B directly replace the 3KP90A-B without circuit modification? A: Yes. The 5KP90A-B maintains identical voltage specifications and package form factor. The increased current and power ratings provide enhanced protection without requiring circuit changes. Verify PCB layout compatibility with the P600 package footprint.

Q: What is the difference between P600 and R-6 axial packages? A: Both are through-hole axial packages formats. P600 and R-6 differ in physical dimensions and lead spacing. Mechanical compatibility depends on PCB footprint design. Verify lead pitch and body length against your PCB layout before substitution.

Q: Are DO-201 package alternatives mechanically compatible? A: DO-201 is a through-hole axial package with different physical dimensions than P600. Substitution requires PCB footprint verification. Lead pitch and body length must accommodate the alternative package. Consult PCB layout specifications before implementation.

Q: Why do some substitute parts show different voltage specifications? A: The 1.5KE series operates at slightly different voltage windows (85.5V to 94V standoff) compared to the 3KP90A-B (90V standoff). Selection depends on circuit protection requirements. Verify that the substitute part's voltage window encompasses your protected circuit's operating range.

Q: What does "Current - Peak Pulse (10/1000µs)" represent? A: This parameter specifies the maximum peak current the TVS diode can safely conduct during a 10/1000 microsecond transient pulse. Higher values indicate greater transient energy absorption capability. Select parts matching or exceeding your circuit's expected transient current levels.

Q: Is the 3KP90A-TP from Micro Commercial Co a direct equivalent? A: The 3KP90A-TP provides identical electrical specifications and active product status. The R-6 package differs mechanically from the P600 package. Verify PCB footprint compatibility before substitution.

Q: Can lower power-rated parts (1500W) replace the 3000W 3KP90A-B? A: Lower power-rated parts provide functional overvoltage protection but with reduced transient energy absorption. Selection depends on your circuit's expected transient energy levels. Verify that the substitute part's power rating exceeds your application's peak pulse energy requirements.

Q: What compliance certifications apply to these substitute parts? A: All listed substitutes maintain ROHS3 compliance. The 1N6295A-E3/54 includes AEC-Q101 automotive qualification. Verify specific compliance requirements for your application before final selection.

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