3KP90-B Equivalent & Substitute Parts

Part Overview

The 3KP90-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection applications. Featuring a 90V reverse standoff voltage and 153.3V maximum clamping voltage with 20.5A peak pulse current capability, this component provides 3000W peak pulse power dissipation in a through-hole P600 axial package. The 3KP90-B is classified as obsolete, necessitating identification of active alternative components that maintain electrical and mechanical compatibility for new designs and ongoing production requirements.

Key Parameters

Parameter	3KP90-B
Voltage - Reverse Standoff (Typ)	90V
Voltage - Breakdown (Min)	94.95V
Voltage - Clamping (Max) @ Ipp	153.3V
Current - Peak Pulse (10/1000µs)	20.5A
Power - Peak Pulse	3000W
Operating Temperature	-55°C ~ 175°C (TJ)
Package / Case	P600, Axial
Type	Zener
Unidirectional Channels	1
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 3KP90-B is determined by the following critical parameters:

Voltage Rating Compatibility: Reverse standoff voltage within the 90V nominal range (85V–94V acceptable tolerance)
Clamping Voltage Performance: Maximum clamping voltage at Ipp between 125V–152V to maintain circuit protection margins
Peak Pulse Current: Minimum 10.3A to ensure adequate transient suppression capability
Power Dissipation: Minimum 1500W peak pulse rating for adequate thermal performance
Package Type: Through-hole axial configuration (P600, DO-201, or DO-15 packages acceptable)
Operating Temperature Range: -55°C to 175°C minimum
Compliance: ROHS3 compliant, unidirectional Zener type

Substitute parts are grouped into three categories based on power rating and current handling: high-power equivalents (5KP series, 3000W–5000W), mid-power alternatives (1.5KE series, 1500W), and lower-power options (P4KE and P6KE series, 400W–600W).

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Operating Temperature	Product Status
3KP90-B	Littelfuse	90V	94.95V	153.3V	20.5A	3000W	P600, Axial	-55°C ~ 175°C	Obsolete
5KP90A-B	Littelfuse Inc.	90V	100V	146V	34.9A	5000W	P600, Axial	-55°C ~ 175°C	Active
1.5KE110A	Taiwan Semiconductor Corporation	94V	105V	152V	10.3A	1500W	DO-201AA, DO-27, Axial	-55°C ~ 175°C	Active
1.5KE100A	Taiwan Semiconductor Corporation	85.5V	95V	137V	11.4A	1500W	DO-201AA, DO-27, Axial	-55°C ~ 175°C	Active
1.5KE91A	Taiwan Semiconductor Corporation	77.8V	86.5V	125V	12.6A	1500W	DO-201AA, DO-27, Axial	-55°C ~ 175°C	Active
P4KE91A	Taiwan Semiconductor Corporation	77.8V	86.5V	125V	3.3A	400W	DO-204AL, DO-41, Axial	-55°C ~ 175°C	Active
P6KE110A	Taiwan Semiconductor Corporation	94V	105V	152V	4A	600W	DO-204AC, DO-15, Axial	-55°C ~ 175°C	Active
P6KE100A	Fairchild Semiconductor	100V	95V	137V	4.4A	600W	DO-204AC, DO-15, Axial	-55°C ~ 150°C	Active
P6KE91A	Fairchild Semiconductor	77.8V	86.5V	125V	4.8A	600W	DO-204AC, DO-15, Axial	-55°C ~ 175°C	Obsolete
SA85A	Taiwan Semiconductor Corporation	85V	94.4V	137V	3.8A	500W	DO-204AC, DO-15, Axial	-55°C ~ 175°C	Active
1.5KE100A-AP	Micro Commercial Co	85.5V	95V	137V	11.1A	1500W	DO-201AE, Axial	-55°C ~ 175°C	Active

Engineering Selection Recommendations

Primary Recommendation: 5KP90A-B

The 5KP90A-B is the direct functional equivalent for the 3KP90-B. Both components share identical reverse standoff voltage (90V), matching package type (P600 axial), and equivalent operating temperature range (-55°C to 175°C). The 5KP90A-B provides superior performance with 34.9A peak pulse current and 5000W power dissipation compared to the original 20.5A and 3000W specifications. The 5KP90A-B is manufactured by Littelfuse and maintains active product status with ROHS3 compliance, ensuring long-term availability and supply chain stability.

Secondary Recommendations for Reduced Power Applications:

When circuit design permits lower power dissipation, the 1.5KE110A and 1.5KE100A offer active alternatives with 1500W peak pulse ratings. The 1.5KE110A matches the 90V nominal voltage class with 94V reverse standoff and 152V clamping voltage. Both components use DO-201 axial packages and maintain full operating temperature range (-55°C to 175°C) with ROHS3 compliance.

Lower-Power Alternatives:

The P6KE110A and P6KE100A provide 600W power dissipation in DO-15 packages for applications with reduced transient energy requirements. The P6KE110A maintains 94V reverse standoff voltage with 152V clamping performance. These components are suitable for lower-current protection circuits where the 3KP90-B's 3000W capability exceeds application requirements.

Obsolete Part Avoidance:

P6KE91A is classified as obsolete and should not be selected for new designs despite active inventory availability. The 1.5KE91A provides equivalent voltage performance (77.8V standoff, 125V clamping) with active product status.

Frequently Asked Questions (FAQ)

Q: Can the 5KP90A-B directly replace the 3KP90-B without circuit modification?

A: Yes. The 5KP90A-B maintains identical reverse standoff voltage (90V), clamping voltage performance (146V vs. 153.3V), and P600 axial package configuration. The increased current rating (34.9A vs. 20.5A) and power dissipation (5000W vs. 3000W) provide enhanced protection margins without requiring design changes.

Q: What is the primary difference between P600 and DO-201 packages?

A: Both are through-hole axial packages with identical lead spacing and mounting compatibility. P600 and DO-201 designations refer to the same physical form factor used by different manufacturers. Components in either package can be substituted based on electrical parameters.

Q: Why do some substitute parts have lower peak pulse current ratings?

A: The 1.5KE and P-series TVS diodes are designed for different power dissipation classes. The 1.5KE series (1500W) and P6KE series (600W) are suitable for applications where transient energy is lower than the 3KP90-B's 3000W specification. Selection depends on actual circuit transient magnitude and duration.

Q: Are all listed substitutes ROHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant. The P6KE91A is ROHS3 compliant but classified as obsolete and should not be used for new designs.

Q: What is the significance of the 10/1000µs pulse specification?

A: This defines the peak pulse current rating under a specific transient waveform: 10µs rise time and 1000µs total duration. This standardized test condition allows direct comparison of TVS diode performance across different manufacturers and product lines.

Q: Can I use a lower voltage-rated TVS diode as a substitute?

A: No. The reverse standoff voltage must remain within the 90V nominal class (85V–94V range). Using a lower voltage rating will cause the TVS diode to conduct during normal circuit operation, creating excessive leakage current and potential circuit malfunction.

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