P4KE9.1C-B Equivalent & Substitute Parts

Part Overview

The P4KE9.1C-B is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. This bidirectional Zener diode operates in the DO-204AL (DO-41) through-hole package with a reverse standoff voltage of 7.78V and peak pulse power rating of 400W. The part is currently classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
Reverse Standoff Voltage (Typ)	7.78	V
Voltage - Breakdown (Min)	8.19	V
Voltage - Clamping (Max) @ Ipp	14.07	V
Current - Peak Pulse (10/1000µs)	30.6	A
Power - Peak Pulse	400	W
Operating Temperature Range	-55 to 175	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	DO-204AL (DO-41)	—
Type	Zener	—
Bidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the P4KE9.1C-B is determined by strict equivalence across the following critical parameters:

Reverse Standoff Voltage (Typ): 7.78V
Package / Case: DO-204AL (DO-41) through-hole
Bidirectional Channels: 1
Type: Zener
Operating Temperature Range: -55°C to 175°C (TJ)
Power - Peak Pulse: 400W
Applications: General Purpose

The identified substitute parts maintain these core electrical and mechanical specifications, ensuring functional compatibility in existing circuit designs. Variations in clamping voltage and peak pulse current within the P4KE series remain within acceptable tolerance ranges for general-purpose transient suppression applications.

Parameter Comparison

Parameter	P4KE9.1C-B (Main)	P4KE9.1CA (Substitute)	P4KE9.1CA-B (Substitute)
Manufacturer	Littelfuse Inc.	Taiwan Semiconductor Corporation	Littelfuse Inc.
Product Status	Obsolete	Active	Active
Reverse Standoff Voltage (Typ)	7.78V	7.78V	7.78V
Voltage - Breakdown (Min)	8.19V	8.65V	8.65V
Voltage - Clamping (Max) @ Ipp	14.07V	13.4V	13.4V
Current - Peak Pulse (10/1000µs)	30.6A	31A	30.6A
Power - Peak Pulse	400W	400W	400W
Operating Temperature Range	-55 to 175°C (TJ)	-55 to 175°C (TJ)	-55 to 175°C (TJ)
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AL (DO-41)	DO-204AL (DO-41)	DO-204AL (DO-41)
Type	Zener	Zener	Zener
Bidirectional Channels	1	1	1
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
ECCN	EAR99	EAR99	EAR99
HTSUS	8541.10.0080	8541.10.0080	8541.10.0080

Engineering Selection Recommendations

Both P4KE9.1CA and P4KE9.1CA-B are active product alternatives to the obsolete P4KE9.1C-B. Selection between these substitutes is based on packaging and supplier availability:

P4KE9.1CA (Taiwan Semiconductor Corporation) is supplied in Tape & Reel (TR) packaging, suitable for automated assembly processes and high-volume production environments.

P4KE9.1CA-B (Littelfuse Inc.) is supplied in Bulk packaging, suitable for manual assembly, prototyping, and lower-volume applications. This option maintains the original manufacturer lineage.

Both substitutes maintain ROHS3 compliance, MSL Level 1 (unlimited moisture sensitivity), and identical ECCN and HTSUS classifications as the original part. The clamping voltage differential (13.4V versus 14.07V) and peak pulse current variation (31A versus 30.6A) remain within acceptable operational tolerances for general-purpose transient suppression circuits.

Frequently Asked Questions (FAQ)

Q: Can P4KE9.1CA and P4KE9.1CA-B be used interchangeably with P4KE9.1C-B?

A: Yes. Both substitute parts maintain identical reverse standoff voltage (7.78V), operating temperature range (-55 to 175°C), power rating (400W), and package configuration (DO-204AL through-hole). The clamping voltage and peak pulse current variations are within acceptable tolerance ranges for general-purpose applications.

Q: What is the primary difference between P4KE9.1CA and P4KE9.1CA-B?

A: The primary difference is packaging format. P4KE9.1CA is supplied in Tape & Reel (TR) for automated assembly, while P4KE9.1CA-B is supplied in Bulk for manual assembly and lower-volume applications. Electrical specifications are equivalent.

Q: Why is the original P4KE9.1C-B classified as obsolete?

A: Product obsolescence is determined by the manufacturer. Active alternatives with equivalent electrical and mechanical specifications are available through the identified substitute parts.

Q: Are there compliance or certification differences between the main part and substitutes?

A: No. All three parts maintain identical RoHS3 compliance, MSL Level 1 rating, ECCN (EAR99), and HTSUS (8541.10.0080) classifications.

Q: What is the significance of the clamping voltage difference (14.07V vs. 13.4V)?

A: The clamping voltage represents the maximum voltage across the diode at peak pulse current. The 0.67V difference falls within normal manufacturing tolerance ranges for TVS diodes in this category and does not affect functional compatibility in general-purpose transient suppression circuits.

Q: Can these parts be used in new designs, or only as replacements for obsolete inventory?

A: The substitute parts P4KE9.1CA and P4KE9.1CA-B are active products and are suitable for both new designs and replacement applications.

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