P4KE33-B Equivalent & Substitute Parts

Part Overview

The P4KE33-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This unidirectional zener diode operates with a reverse standoff voltage of 28.2V and provides clamping at 47.99V with a peak pulse current rating of 9A. The component is housed in a DO-204AL (DO-41) axial through-hole package and is rated for 400W peak pulse power dissipation across an operating temperature range of -55°C to 175°C.

The P4KE33-B carries an obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term product availability for applications requiring this voltage suppression specification.

Substiute Parts

P4KE33-B

Littelfuse Inc.In Stock: 1034P4KE33-B Datasheet

Current PartRFQ

P4KE33A

Taiwan Semiconductor CorporationIn Stock: 1001P4KE33A Datasheet

DirectRFQ

P4KE33A-B

Littelfuse Inc.In Stock: 1034P4KE33A-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P4KE33-B is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Reverse standoff voltage: 28.2V (Typ)
• Unidirectional channel configuration: 1 channel
• Peak pulse current rating: 9A minimum
• Peak pulse power rating: 400W minimum
• Operating temperature range: -55°C to 175°C minimum

Mechanical Compatibility Criteria:

• Mounting type: Through Hole
• Package type: DO-204AL (DO-41) Axial
• Series designation: P4KE

Compliance Criteria:

• RoHS3 compliance required
• Moisture sensitivity level: 1 (Unlimited)

Substitute parts must satisfy all electrical parameters within the specified tolerances, maintain identical mechanical form factor and mounting characteristics, and meet or exceed the compliance certifications of the original component.

Parameter Comparison

Engineering Selection Recommendations

Both P4KE33A and P4KE33A-B are qualified substitutes for the obsolete P4KE33-B based on electrical and mechanical parameter alignment within the P4KE series specification.

P4KE33A (Taiwan Semiconductor Corporation):

• Active product status ensures long-term availability and supply chain continuity
• ROHS3 compliant with REACH unaffected designation
• Supplied in Tape & Reel (TR) packaging, suitable for automated assembly processes
• Clamping voltage of 45.7V is lower than the original 47.99V, providing improved transient suppression margin

P4KE33A-B (Littelfuse Inc.):

• Active product status with established manufacturer continuity
• ROHS3 compliant with REACH unaffected designation
• Supplied in Bulk packaging, suitable for manual assembly or custom packaging requirements
• Clamping voltage of 45.7V is lower than the original 47.99V, providing improved transient suppression margin

Both substitutes maintain identical reverse standoff voltage (28.2V), peak pulse current (9A), and power dissipation (400W) specifications. Selection between P4KE33A and P4KE33A-B depends on packaging requirements and supply chain preferences.

Frequently Asked Questions (FAQ)

Q: Can P4KE33A or P4KE33A-B be used as direct replacements for P4KE33-B?

A: Yes. Both parts maintain the same reverse standoff voltage (28.2V), peak pulse current rating (9A), power dissipation (400W), and mechanical form factor (DO-204AL through-hole axial package). The lower clamping voltage (45.7V vs. 47.99V) provides enhanced overvoltage protection performance.

Q: What is the difference between P4KE33A and P4KE33A-B?

A: The primary difference is packaging format. P4KE33A is supplied in Tape & Reel (TR) format for automated assembly, while P4KE33A-B is supplied in Bulk format. Electrical specifications and performance are identical.

Q: Are there compliance differences between the substitute parts and the original?

A: All three parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. P4KE33A and P4KE33A-B both carry REACH unaffected designation, confirming regulatory alignment.

Q: Why is the clamping voltage lower in the substitute parts?

A: The P4KE33A and P4KE33A-B variants specify a maximum clamping voltage of 45.7V compared to 47.99V in the P4KE33-B. This represents a tighter specification within the P4KE33 series and provides superior transient voltage suppression performance.

Q: What is the operating temperature range for these parts?

A: All three parts operate across -55°C to 175°C junction temperature (TJ), ensuring performance consistency across industrial and extended temperature applications.

Q: Are these parts suitable for power line protection applications?

A: No. All three parts are designated for general-purpose transient voltage suppression and are not rated for power line protection applications.