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P4KE33C Equivalent & Substitute Parts
Part Overview
The P4KE33C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., rated for 28.2V reverse standoff voltage with 400W peak pulse power dissipation. The device is housed in a DO-204AL (DO-41) axial through-hole package and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute parts maintain functional compatibility through matching or superior electrical characteristics within the TVS diode category.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 28.2 | V |
| Voltage - Breakdown (Min) | 29.75 | V |
| Voltage - Clamping (Max) @ Ipp | 47.99 | V |
| Current - Peak Pulse (10/1000µs) | 9 | A |
| Power - Peak Pulse | 400 | W |
| Bidirectional Channels | 1 | — |
| Operating Temperature Range | -55 to 175 | °C (TJ) |
| Mounting Type | Through Hole | — |
| Package / Case | DO-204AL, DO-41, Axial | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution of the P4KE33C is determined by the following critical parameters:
- Voltage - Reverse Standoff (Typ): 28.2V nominal operating voltage window
- Voltage - Clamping (Max) @ Ipp: Maximum transient voltage suppression capability
- Current - Peak Pulse (10/1000µs): Surge current handling capacity
- Power - Peak Pulse: Energy dissipation rating
- Mounting Type: Through-hole axial configuration
- Operating Temperature Range: -55°C to 175°C junction temperature capability
- RoHS Compliance: ROHS3 compliance requirement
Substitute parts are grouped into two categories:
Direct Equivalents (Same Package, Same Power Rating): Parts maintaining the DO-204AL (DO-41) package and 400W power rating with matching or tighter voltage specifications.
Higher-Power Alternatives (Enhanced Capability): Parts with superior power dissipation (600W or 1500W) and current handling, available in alternative through-hole packages (DO-15, DO-201), suitable for applications requiring increased transient protection margin.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Clamping (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Package | Product Status |
|---|---|---|---|---|---|---|---|
| P4KE33C | Littelfuse Inc. | 28.2 | 47.99 | 9 | 400 | DO-204AL (DO-41) | Obsolete |
| P4KE33CA | Taiwan Semiconductor Corporation | 28.2 | 45.7 | 9 | 400 | DO-204AL (DO-41) | Active |
| P4KE30CA | Taiwan Semiconductor Corporation | 25.6 | 41.4 | 10 | 400 | DO-204AL (DO-41) | Active |
| P6KE30CA | Diotec Semiconductor | 25.6 | 41.4 | 15 | 600 | DO-204AC (DO-15) | Active |
| P6KE33CA | Diotec Semiconductor | 28.2 | 45.7 | 13.8 | 600 | DO-204AC (DO-15) | Active |
| 1.5KE30CA | Taiwan Semiconductor Corporation | 25.6 | 41.4 | 38 | 1500 | DO-201AA (DO-27) | Active |
| 1.5KE33CA | Diotec Semiconductor | 28.2 | 45.7 | 34 | 1500 | Axial | Active |
| SA24CA | Fairchild Semiconductor | 24 | 38.9 | 13.1 | 500 | DO-204AC (DO-15) | Obsolete |
| SA26CA | Taiwan Semiconductor Corporation | 26 | 54.6 | 12.4 | 500 | DO-204AC (DO-15) | Active |
| SA26CA-B | Littelfuse | 26 | 42.1 | 12.1 | 500 | DO-204AC (DO-15) | Active |
| SA28CA | Taiwan Semiconductor Corporation | 28 | 59 | 11.5 | 500 | DO-204AC (DO-15) | Active |
Engineering Selection Recommendations
Primary Direct Equivalent: P4KE33CA (Taiwan Semiconductor Corporation) is the recommended first-choice substitute. It maintains identical reverse standoff voltage (28.2V), matching package (DO-204AL), equivalent power rating (400W), and active product status with ROHS3 compliance. Electrical characteristics are within acceptable tolerance of the original P4KE33C.
Secondary Direct Equivalent: P4KE30CA (Taiwan Semiconductor Corporation) provides compatible performance in the same package with slightly lower voltage rating (25.6V standoff). This part is suitable for applications where the lower voltage threshold is acceptable and offers active status with full compliance documentation.
Higher-Power Alternatives: P6KE33CA (Diotec Semiconductor) and 1.5KE33CA (Diotec Semiconductor) provide enhanced transient protection with 600W and 1500W power ratings respectively, maintaining the 28.2V voltage specification. These parts require package accommodation changes (DO-15 or axial) but deliver superior surge handling capability. Both are active products with ROHS3 compliance.
Voltage-Variant Alternatives: P6KE30CA (Diotec Semiconductor) and 1.5KE30CA (Taiwan Semiconductor Corporation) offer 25.6V standoff voltage with increased power dissipation. Selection depends on circuit voltage tolerance requirements.
Avoid: SA24CA (Fairchild Semiconductor) is obsolete and should not be selected for new designs despite active inventory. SA26CA and SA28CA variants introduce voltage deviations (26V and 28V respectively) and higher clamping voltages that may not align with original circuit protection thresholds.
Frequently Asked Questions (FAQ)
Q: Can P4KE33CA directly replace P4KE33C without circuit modification?
A: Yes. P4KE33CA maintains identical reverse standoff voltage (28.2V), equivalent clamping voltage (45.7V vs. 47.99V), matching current rating (9A), and identical power dissipation (400W). The DO-204AL package is mechanically and electrically interchangeable. No circuit modification is required.
Q: What is the difference between P4KE33CA and P6KE33CA?
A: P6KE33CA provides 600W power dissipation versus 400W in P4KE33CA, with higher peak pulse current (13.8A vs. 9A). The voltage specifications (28.2V standoff, 45.7V clamping) are identical. P6KE33CA uses a DO-15 package instead of DO-41, requiring different PCB footprint accommodation. Selection depends on transient energy requirements.
Q: Are SA26CA and SA28CA suitable replacements?
A: SA26CA and SA28CA are not recommended as direct replacements. SA26CA operates at 26V standoff (2.2V lower than P4KE33C) with significantly higher clamping voltage (54.6V). SA28CA operates at 28V standoff with 59V clamping voltage. These voltage deviations alter circuit protection characteristics and may compromise transient suppression effectiveness.
Q: What package options are available for higher-power substitutes?
A: Higher-power alternatives use DO-15 (DO-204AC) or DO-201 (DO-27) packages. P6KE33CA uses DO-15, a slightly larger axial package compatible with standard through-hole PCB layouts. 1.5KE33CA uses a larger axial package. All maintain through-hole mounting compatibility with appropriate footprint redesign.
Q: Are all substitute parts ROHS3 compliant?
A: P4KE33CA, P4KE30CA, P6KE33CA, 1.5KE30CA, and 1.5KE33CA are confirmed ROHS3 compliant. SA26CA, SA26CA-B, and SA28CA are ROHS3 compliant. SA24CA is ROHS3 compliant but obsolete. P6KE30CA RoHS status is not applicable per manufacturer specification.
Q: Can I use 1.5KE33CA in a space-constrained application?
A: 1.5KE33CA provides superior transient protection (1500W, 34A peak pulse) with matching voltage specifications (28.2V standoff, 45.7V clamping). However, it uses a larger axial package than the original DO-41. Physical space availability must be verified before selection. If space is critical, P6KE33CA (600W, DO-15) offers a compromise between performance and size.
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