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Taiwan Semiconductor Corporation P4KE33
- Part No.:
- P4KE33
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
P4KE33.pdf
- Description:
- 400W, 33V, UNIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:4,010
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Product details
Overview
P4KE33 from Taiwan Semiconductor is a unidirectional 400W transient voltage suppressor (TVS) diode designed for primary-level overvoltage protection in DC power rails and signal lines. It features a nominal breakdown voltage of 33 V, clamps transients to ≤47.7 V at 8.8 A peak pulse current, and operates across –55°C to +175°C junction temperature range - deployed in automotive power supply inputs and industrial sensor interface circuits.
For engineers reviewing the P4KE33 datasheet, P4KE33 pinout, P4KE33 application, or P4KE33 equivalent, key selection criteria include its DO-41 package compatibility, 26.8 V working stand-off voltage, low 1 µA reverse leakage at VWM, and AEC-Q101 qualification option (P4KE33H), making it suitable for ESD and lightning surge protection in safety-critical embedded systems.
Technical Context
The P4KE33 uses an avalanche breakdown mechanism to provide fast, repeatable clamping during transient events. Its 10/1000 µs waveform rating of 400 W defines energy-handling capability under standardized surge conditions, while its <1.0 ps response time ensures suppression before sensitive downstream circuitry is stressed.
Designed as a unidirectional device, it blocks reverse voltage up to 26.8 V (VWM) and conducts only when forward-biased beyond VBR (29.7–36.3 V). The 0.098 %/°C temperature coefficient of VBR enables predictable voltage drift across operating temperature ranges without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26.8 V - Maximum continuous reverse voltage before significant leakage; sets safe operating margin below breakdown. |
| VBR @ IT=1 mA | 29.7–36.3 V - Measured breakdown range at 1 mA test current; defines minimum and maximum clamping onset threshold. |
| VC @ IPPM=8.8 A | 47.7 V - Clamped voltage during 10/1000 µs surge; determines maximum stress on protected ICs. |
| IPPM | 8.8 A - Peak pulse current corresponding to 400 W surge rating; used to size series impedance and verify PCB trace survival. |
| IR @ VWM | <1 µA - Reverse leakage at stand-off voltage; ensures minimal power loss and no false triggering in low-power circuits. |
| TJ max | +175 °C - Maximum junction temperature; supports operation in engine bay or industrial enclosures without derating. |
| Package | DO-204AL (DO-41) - Standard axial-leaded through-hole package with tin-plated leads; compatible with wave soldering per J-STD-002. |
Pinout & Package
DO-204AL (DO-41) package: axial-leaded, cylindrical glass-passivated body with cathode band marking. Leads are pure tin-plated, solderable per J-STD-002; polarity is marked by cathode band (cathode = banded end).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or lower-potential rail; conducts surge current toward reference plane during overvoltage events. |
| Cathode | Reverse-blocking / clamping terminal | Connected to protected line; blocks normal operation up to 26.8 V, then avalanches to clamp transients above ~30 V. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Handles 10/1000 µs surges up to 8.8 A without degradation - sufficient for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 4 compliance testing. |
| <1.0 ps response time | Clamps transients before propagation into IC input stages - critical for protecting high-speed microcontrollers and CAN transceivers. |
| AEC-Q101 qualified variant available | P4KE33H meets stress-test requirements for automotive electronics including temperature cycling, HTRB, and ESD - validated for under-hood applications. |
| UL Recognized (E326243) | Meets UL 94V-0 flammability standard for molding compound - required for safety-certified industrial power supplies and lighting drivers. |
| RoHS & halogen-free | Complies with IEC 61249-2-21; eliminates brominated flame retardants and heavy metals - supports green manufacturing and export compliance. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: 12 V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Primary clamping device placed at connector entry point, shunting surge energy to chassis ground. Use Value: Limits voltage seen by LDOs and MCU power pins to ≤47.7 V, preventing latch-up and gate oxide damage during 100 V/100 ms transients. |
Use Scenario: 4–20 mA current loop sensors in factory automation subject to EFT (IEC 61000-4-4) and cable coupling noise. IC Role / Device Role / Timing Role: Bidirectional protection not applicable; P4KE33 used unidirectionally across signal-to-ground to suppress negative-going transients. Use Value: Maintains signal integrity with <1 µA leakage at 24 V nominal, while clamping fast 5 kV EFT bursts to safe levels within nanoseconds. |
| LED Driver Overvoltage Clamp | DC Power Rail Surge Suppression |
|
Use Scenario: Constant-current LED drivers in streetlight systems subjected to lightning-induced surges on AC mains input rectified to 350 V DC bus. IC Role / Device Role / Timing Role: Secondary-level clamp on low-voltage control side (e.g., 33 V bias rail), coordinated with MOV primary protection. Use Value: Prevents driver IC failure by limiting 33 V rail excursions to 47.7 V during coupled transients - avoids thermal runaway in gate drivers and op-amps. |
Use Scenario: 24 V DC distribution in PLC backplanes where inductive switching (relays, solenoids) generates >100 V spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VCC and GND on each module's power entry, sized for worst-case inductive kick energy. Use Value: Absorbs 400 W for 1 ms without failure, enabling robust field reliability with no need for active crowbar circuits or complex snubbers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse P4KE33A | Tighter VBR tolerance (31.4–34.7 V vs. 29.7–36.3 V); lower VC = 45.7 V at same IPPM. | Better clamping margin for 3.3 V or 5 V logic rails downstream; slightly higher cost and longer lead time. | Select P4KE33A when tighter voltage control and lower clamping are prioritized over cost and availability. |
| ON Semiconductor 1.5KE33A | Same DO-41 package but 1500 W rating; VBR = 29.7–36.3 V, VC = 49.9 V at 30.1 A. | Higher energy handling for infrequent, high-amplitude surges; larger footprint not needed for typical 400 W use cases. | Choose 1.5KE33A only if system-level testing confirms need for >400 W surge capacity - otherwise P4KE33 offers better cost-performance balance. |
Compared with P4KE33, the P4KE33A delivers tighter parametric control and lower clamping voltage for precision-sensitive designs, while the 1.5KE33A trades off higher surge rating and less precise VC for applications requiring greater single-event energy absorption - neither is pin-compatible without layout review due to differing IPPM derating curves and thermal mass.
Availability
P4KE33 is available at Aetrix Electronics and suitable for automotive power inputs, industrial sensor interfaces, LED driver bias rails, and DC distribution systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for P4KE33 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers, with global ISO/TS 16949 and IATF 16949 certification.
The P4KE series was developed for cost-effective, high-reliability transient suppression in automotive and industrial environments - emphasizing AEC-Q101 qualification, tight parameter distributions, and robust DO-41 packaging for manual and automated assembly.
FAQ
What is the maximum clamping voltage of the P4KE33 under standard surge conditions?
The P4KE33 clamps to a maximum of 47.7 V when subjected to its rated 10/1000 µs surge waveform at 8.8 A peak pulse current (IPPM). This value is measured per ANSI/IEEE C62.35 and represents the upper limit of voltage imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is the P4KE33 suitable for bidirectional transient protection?
No, the P4KE33 is a unidirectional TVS diode and is not rated for bidirectional operation. For symmetrical surge protection (e.g., data lines or AC-coupled signals), the P4KE33CA or P4KE33A variants must be selected. Using P4KE33 in reverse-biased configurations risks premature breakdown or failure due to lack of specified reverse standoff or clamping behavior.
What does the "H" suffix mean in P4KE33H, and is it required for automotive use?
The "H" suffix in P4KE33H denotes AEC-Q101 qualification - verified through accelerated stress testing including HTGB, HTRB, and temperature cycling. While not universally mandated, P4KE33H is required for automotive applications where component-level reliability validation is enforced (e.g., Tier 1 supplier BOMs, ASIL-B systems), whereas standard P4KE33 may be used in non-safety-critical aftermarket modules.
How does the P4KE33 compare to the 1N5388B Zener diode in overvoltage protection roles?
The P4KE33 is optimized for transient suppression with 400 W surge capability and sub-nanosecond response, while the 1N5388B is a 5 W Zener regulator intended for steady-state voltage reference. Their VZ/VBR ranges overlap (~33 V), but the 1N5388B cannot safely absorb surge energy - using it as a TVS risks catastrophic failure. P4KE33 provides reliable, repeatable clamping; 1N5388B does not.
Can the P4KE33 be used in parallel to increase surge current handling?
No - paralleling P4KE33 devices is not recommended due to mismatched VBR tolerances (29.7–36.3 V), which cause uneven current sharing and potential thermal runaway. To handle higher surge currents, select a single higher-rated device (e.g., 1.5KE33A) or implement coordinated staged protection with upstream MOVs and downstream low-capacitance TVS arrays.
P4KE33 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-204AL, DO-41, Axial
- Series:
- P4KE
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 26.8V
- Voltage - Breakdown (Min):
- 29.7V
- Voltage - Clamping (Max) @ Ipp:
- 47.7V
- Current - Peak Pulse (10/1000µs):
- 8.8A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
P4KE33 FAQ
1.How can I place an order for P4KE33 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4KE33 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for P4KE33 reliable?
The price and inventory of P4KE33 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4KE33 is usually 5 days.
3.What payment methods are accepted for P4KE33?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4KE33 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4KE33?
P4KE33 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4KE33 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for P4KE33?
For technical support, including P4KE33 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4KE33 requirements.
6.How does Aetrix verify that P4KE33 is sourced from the original manufacturer or authorized distributors?
All P4KE33 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that P4KE33 meets industry standards.
7.What is the process for return or replacement of P4KE33?
All P4KE33 units undergo pre-shipment inspection (PSI). If there is an issue with P4KE33, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The P4KE33 part is unused and in its original packaging.
Return procedure for P4KE33:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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