1.5KE91CA Transient Voltage Suppressor (TVS) Diode — Equivalent & Substitute Parts

Part Overview

The 1.5KE91CA is a bidirectional Zener TVS diode manufactured by Diodes Incorporated, designed for transient voltage suppression in general-purpose applications. This component features a 77.8V reverse standoff voltage, 125V maximum clamping voltage, and 1500W peak pulse power rating in a through-hole DO-201 axial package. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	77.8	V
Voltage - Breakdown (Min)	86.5	V
Voltage - Clamping (Max) @ Ipp	125	V
Current - Peak Pulse (10/1000µs)	12	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	—
Bidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the 1.5KE91CA is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 77.8V
Voltage - Breakdown (Min): 86.5V
Voltage - Clamping (Max) @ Ipp: 125V
Current - Peak Pulse (10/1000µs): 12A minimum
Power - Peak Pulse: 1500W minimum
Operating Temperature Range: -55°C to 175°C (TJ)
Mounting Type: Through Hole
Package / Case: DO-201 series (DO-201AA, DO-27, DO-201AD, DO-201AE)
Type: Zener, Bidirectional
RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories:

Category A — Direct Electrical & Mechanical Equivalents (Active Status) Parts meeting all critical parameters with identical or superior electrical performance and compatible through-hole axial packaging. These parts are manufactured by different suppliers but maintain the same voltage ratings, clamping characteristics, and power dissipation capability.

Category B — Functional Alternatives with Modified Specifications Parts that meet core voltage and clamping requirements but differ in peak pulse current, power rating, or package variant. These are suitable only when application requirements permit reduced current handling or alternative package configurations.

Parameter Comparison

Part Number	Manufacturer	VWM (Typ) V	VBR (Min) V	VC (Max) V	Ipp A	Power W	Temp Range °C	Package	Status
1.5KE91CA	Diodes Incorporated	77.8	86.5	125	12	1500	-55 to 175	DO-201	Obsolete
1.5KE91CA-E3/54	Vishay General Semiconductor	77.8	86.5	125	12	1500	-55 to 175	DO-201	Active
1.5KE91CAHE3_A/C	Vishay General Semiconductor	77.8	86.5	125	12	1500	-55 to 175	DO-201	Active
1V5KE91CA	Fairchild Semiconductor	77.8	86.5	125	12	1500	-55 to 175	DO-201AD	Active
1.5KE91CA	Taiwan Semiconductor Corporation	77.8	86.5	125	12.6	1500	-55 to 175	DO-201	Active
1.5KE91CA-B	Littelfuse Inc.	77.8	86.5	125	12.2	1500	-55 to 175	DO-201	Active
1.5KE91CA-G	Comchip Technology	77.8	86.45	125	12	1500	-55 to 150	DO-201	Active
1.5KE91CA-TP	Micro Commercial Co	77.8	86.5	125	—	1500	-55 to 175	DO-201AE	Active
TP6KE91CA	Littelfuse Inc.	77.8	86.5	125	4.9	600	-55 to 175	DO-204AC (DO-15)	Active
5KP70CE3/TR13	Microchip Technology	70	77.8	125	40	5000	-55 to 175	P600	Active

Engineering Selection Recommendations

Primary Substitutes (Category A — Direct Equivalents)

For applications requiring exact electrical and mechanical compatibility with the obsolete 1.5KE91CA, the following active parts are recommended:

1.5KE91CA-E3/54 (Vishay General Semiconductor): Identical electrical specifications, active product status, ROHS3 compliant. Available in Cut Tape packaging.
1.5KE91CAHE3_A/C (Vishay General Semiconductor): Identical electrical specifications with AEC-Q101 automotive qualification. Suitable for automotive-grade applications requiring enhanced reliability.
1V5KE91CA (Fairchild Semiconductor): Identical electrical specifications, active product status. Available in bulk packaging with DO-201AD package variant.
1.5KE91CA (Taiwan Semiconductor Corporation): Identical electrical specifications with marginally higher peak pulse current (12.6A vs. 12A). Highest inventory availability. ROHS3 compliant.
1.5KE91CA-B (Littelfuse Inc.): Identical electrical specifications with peak pulse current of 12.2A. Active product status, ROHS3 compliant.

Secondary Substitutes (Category B — Functional Alternatives)

1.5KE91CA-G (Comchip Technology): Meets voltage and clamping specifications. Operating temperature range limited to -55°C to 150°C (vs. 175°C). Suitable for applications not requiring extended high-temperature operation.
1.5KE91CA-TP (Micro Commercial Co): Meets voltage and clamping specifications. Peak pulse current not specified in documentation. DO-201AE package variant. Suitable when peak pulse current specification is not critical.
TP6KE91CA (Littelfuse Inc.): Meets voltage and clamping specifications but with significantly reduced peak pulse current (4.9A vs. 12A) and power rating (600W vs. 1500W). Different package (DO-204AC/DO-15). Suitable only for low-current transient suppression applications. AEC-Q101 automotive qualified.

Non-Equivalent Alternative

5KP70CE3/TR13 (Microchip Technology): Different voltage class (70V standoff vs. 77.8V) and package (P600 vs. DO-201). Higher power rating (5000W) and peak pulse current (40A). Not suitable as direct substitute; applicable only to different circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can I use 1.5KE91CA-E3/54 as a direct replacement for the obsolete 1.5KE91CA?

A: Yes. The 1.5KE91CA-E3/54 from Vishay General Semiconductor maintains identical electrical specifications (77.8V standoff, 125V clamping, 12A peak pulse, 1500W power) and compatible through-hole DO-201 axial packaging. Both are ROHS3 compliant. This is the recommended primary substitute.

Q: What is the difference between 1.5KE91CAHE3_A/C and standard 1.5KE91CA-E3/54?

A: Both parts are electrically identical. The 1.5KE91CAHE3_A/C carries AEC-Q101 automotive qualification, indicating enhanced reliability testing and suitability for automotive applications. Select this variant if your application requires automotive-grade components.

Q: Can I use TP6KE91CA as a substitute?

A: TP6KE91CA is not a direct substitute. While it maintains the same voltage ratings (77.8V standoff, 125V clamping), it has significantly reduced peak pulse current (4.9A vs. 12A) and power rating (600W vs. 1500W). It uses a different package (DO-204AC/DO-15 vs. DO-201). Use only if your application requires lower current suppression and the smaller package is acceptable.

Q: Why is 5KP70CE3/TR13 listed if it is not compatible?

A: 5KP70CE3/TR13 is included for reference only. It operates at a different voltage class (70V standoff vs. 77.8V) and is not suitable as a substitute for the 1.5KE91CA. It is applicable only to circuits designed for lower voltage suppression with higher current handling.

Q: What packaging options are available for 1.5KE91CA substitutes?

A: Primary substitutes are available in Cut Tape (CT), Tape & Reel (TR), and Bulk packaging. All maintain the through-hole axial DO-201 series package (DO-201AA, DO-201AD, DO-201AE variants). Package selection depends on procurement and assembly requirements; electrical performance is identical across packaging options.

Q: Are all substitute parts ROHS3 compliant?

A: All primary substitutes (Category A) are ROHS3 compliant. Verify compliance documentation for specific part numbers if regulatory certification is required for your application.

Q: What is the inventory status of substitute parts?

A: Inventory availability varies by manufacturer and distributor. Taiwan Semiconductor Corporation's 1.5KE91CA shows the highest documented inventory (14,829 pcs). Vishay and Littelfuse variants show active status with moderate inventory levels. Verify current availability with your component supplier.

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