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Vishay General Semiconductor - Diodes Division P4KA33AHE3/73
- Part No.:
- P4KA33AHE3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
P4KA33AHE3/73.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:9,247
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Product details
Overview
P4KA33AHE3/73 from Vishay General Semiconductor is a unidirectional automotive-grade transient voltage suppressor (TVS) diode in DO-204AL (DO-41) package, rated for 400 W peak pulse power (10/1000 µs), 31.4–34.7 V breakdown voltage (VBR), and 45.7 V clamping voltage (VC) at 8.8 A peak pulse current. It operates from −65 °C to +185 °C and is AEC-Q101 qualified for engine control units, sensor protection, and power line surge suppression in automotive electronics.
For engineers reviewing the P4KA33AHE3/73 datasheet, P4KA33AHE3/73 pinout, P4KA33AHE3/73 application, or P4KA33AHE3/73 equivalent, key selection criteria include its 1.5 W steady-state power dissipation, 28.2 V stand-off voltage (VWM), 1.0 µA max reverse leakage at VWM, 0.098 %/°C VBR temperature coefficient, and RoHS-compliant HE3 high-reliability lead finish.
Technical Context
This TVS diode uses Vishay's patented PAR® construction to deliver low incremental surge resistance and fast response time (<1 ns), enabling effective clamping of inductive switching transients and ESD events on 12 V and 24 V automotive power rails. Its unidirectional polarity and DO-41 axial package support through-hole mounting in space-constrained engine bay modules.
The device is characterized per ANSI/IEEE C62.35 and tested with 10/1000 µs waveform at 0.01 % duty cycle. Thermal derating follows Fig. 2 and Fig. 5, maintaining 100 % PPPM rating up to TJ = 25 °C and linearly reducing to zero at 185 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 400 W - sustains single high-energy surges without failure in automotive load-dump scenarios |
| Breakdown Voltage VBR | 31.4–34.7 V at 1 mA - defines precise conduction threshold for overvoltage protection |
| Clamping Voltage VC | 45.7 V at 8.8 A - limits downstream IC voltage stress during worst-case transient |
| Stand-off Voltage VWM | 28.2 V - ensures no conduction during normal 24 V system operation |
| Max Reverse Leakage ID | 1.0 µA at VWM, TJ = 150 °C - minimizes standby power loss in always-on circuits |
| Operating Temperature Range | −65 °C to +185 °C - supports under-hood placement near engines and exhaust systems |
| JEDEC Package | DO-204AL (DO-41) - industry-standard axial leaded package compatible with legacy PCB layouts |
Pinout & Package
Package: DO-204AL (DO-41), axial-leaded, molded epoxy case with UL 94 V-0 rating; matte tin-plated leads compliant with J-STD-002 and JESD22-B102; cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to protected circuit ground or lower-potential rail during clamping |
| Cathode | Current exit terminal in forward bias; marked with band | Connected to protected line (e.g., 24 V supply) - conducts when VLINE > VBR |
Key Features
| Feature | Design Value |
|---|---|
| Patented PAR® construction | Enables consistent clamping performance and low dynamic impedance across production lots |
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity, and mechanical shock testing |
| 40 s solder dip at 260 °C | Supports robust reflow and wave soldering processes without parameter shift or delamination |
| JESD201 Class 2 whisker resistance | Prevents tin whisker growth in long-life automotive applications operating above 100 °C |
| RoHS & WEEE compliance | Meets EU environmental directives with lead-free matte tin plating and halogen-free molding compound |
Applications
| Engine Control Unit (ECU) Power Input Protection | Automotive Sensor Signal Line Protection |
|---|---|
Use Scenario: Suppresses load dump transients (up to 60 V, 400 ms) on 24 V supply lines feeding microcontrollers and CAN transceivers in diesel ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between 24 V rail and chassis ground, clamping within nanoseconds. Use Value: Limits voltage seen by downstream LDOs and MCUs to ≤45.7 V, preventing latch-up and permanent damage per ISO 7637-2 Pulse 5a. |
Use Scenario: Protects analog outputs of pressure and temperature sensors connected to body control modules against ISO 10605 ESD events. IC Role / Device Role / Timing Role: Standoff-connected TVS on sensor output line, conducting only during >31.4 V excursions. Use Value: Maintains signal integrity with <1.0 µA leakage at 28.2 V, while clamping 8 kV contact ESD to <45.7 V in <1 ns. |
| Body Electronics Power Distribution Module | Start-Stop System Battery Interface |
Use Scenario: Guards relay driver MOSFETs and gate drivers in door module power distribution boards against inductive kickback from window motor loads. IC Role / Device Role / Timing Role: TVS placed across relay coil or MOSFET drain-source, absorbing 400 W pulses. Use Value: Withstands 40 A IFSM surge and 185 °C junction temperature, enabling reliable operation in sealed enclosures. |
Use Scenario: Shields bidirectional DC-DC converter inputs in 12 V start-stop systems from battery reversal and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to ground on positive input rail, activated only during overvoltage. Use Value: 0.098 %/°C VBR coefficient ensures stable clamping across −40 °C to +125 °C ambient, critical for cold-cranking reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/5A (Vishay) | Surface-mount SMA package; same VBR range (31.4–34.7 V), but lower 400 W rating derated faster above 25 °C | Requires PCB redesign for SMT; better suited for space-constrained ADAS modules than under-hood wiring harnesses | Select for automated assembly where board real estate is constrained and thermal mass is limited |
| 1.5KE33A (ON Semiconductor) | Same DO-41 package and 33 V nominal rating, but 1.5 kW peak power (10/1000 µs); higher VC = 53.3 V at 28.3 A | Higher clamping voltage increases risk to 3.3 V logic; suitable only where protected ICs tolerate >50 V stress | Choose only if system-level analysis confirms downstream devices withstand 53.3 V clamping |
Compared with SMAJ33A-E3/5A and 1.5KE33A, the P4KA33AHE3/73 provides optimal balance of high-temperature stability (185 °C TJ), AEC-Q101 validation, and precise 45.7 V clamping-making it the preferred choice for mission-critical 24 V automotive power rail protection where reliability trumps raw power rating.
Availability
P4KA33AHE3/73 is available at Aetrix Electronics and suitable for engine control units, automotive sensor interfaces, and body electronics power distribution modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for P4KA33AHE3/73 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
Vishay General Semiconductor designs and manufactures discrete semiconductors for high-reliability industrial and automotive applications, with global manufacturing and testing facilities certified to IATF 16949.
The P4KA33AHE3/73 belongs to Vishay's automotive TVS diode family engineered specifically for AEC-Q101 compliance, high-temperature operation, and robust transient immunity in 12 V/24 V vehicle electrical systems.
FAQ
What is the clamping voltage of the P4KA33AHE3/73 at its rated peak pulse current?
The P4KA33AHE3/73 has a maximum clamping voltage (VC) of 45.7 V at 8.8 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream components see no more than 45.7 V during standardized surge events. The P4KA33AHE3/73 maintains this clamping performance across its full operating temperature range.
Is the P4KA33AHE3/73 suitable for 24 V automotive systems?
Yes, the P4KA33AHE3/73 is explicitly designed for 24 V automotive systems. Its 28.2 V stand-off voltage (VWM) exceeds nominal 24 V rail levels while remaining below its 31.4–34.7 V breakdown range, ensuring no conduction during normal operation. It is AEC-Q101 qualified and rated for −65 °C to +185 °C, making the P4KA33AHE3/73 appropriate for under-hood and battery-line applications.
What does the "HE3" suffix indicate in P4KA33AHE3/73?
"HE3" denotes Vishay's high-reliability, RoHS-compliant construction: matte tin-plated leads meeting J-STD-002 solderability and JESD22-B102 mechanical robustness standards, plus JESD201 Class 2 whisker resistance. The "/73" indicates tape-and-reel packaging with 73 mm carrier tape pitch. This suffix confirms the P4KA33AHE3/73 meets automotive-grade process controls and environmental requirements.
How does the P4KA33AHE3/73 differ from the non-A version (P4KA33HE3/73)?
The P4KA33AHE3/73 features tighter VBR tolerance (31.4–34.7 V vs. 29.7–36.3 V for P4KA33HE3/73) and lower clamping voltage (45.7 V vs. 47.7 V), resulting in improved protection margin for sensitive 3.3 V or 5 V logic. Both share DO-41 packaging and AEC-Q101 qualification, but the "A" variant offers enhanced consistency for high-volume automotive production where parameter clustering matters.
Can the P4KA33AHE3/73 be used in bidirectional configurations?
No, the P4KA33AHE3/73 is unidirectional only, as confirmed in the Vishay datasheet Document Number 88364. It conducts only when cathode voltage exceeds anode voltage by ≥31.4 V. For bidirectional transient suppression (e.g., data lines), a separate symmetric TVS array or dual-diode configuration is required - the P4KA33AHE3/73 must not be substituted without circuit redesign.
P4KA33AHE3/73 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AL, DO-41, Axial
- Series:
- PAR®
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 45.7V
- Current - Peak Pulse (10/1000µs):
- 8.8A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 185°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
P4KA33AHE3/73 FAQ
1.How can I place an order for P4KA33AHE3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4KA33AHE3/73 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 P4KA33AHE3/73 reliable?
The price and inventory of P4KA33AHE3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4KA33AHE3/73 is usually 5 days.
3.What payment methods are accepted for P4KA33AHE3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4KA33AHE3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4KA33AHE3/73?
P4KA33AHE3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4KA33AHE3/73 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 P4KA33AHE3/73?
For technical support, including P4KA33AHE3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4KA33AHE3/73 requirements.
6.How does Aetrix verify that P4KA33AHE3/73 is sourced from the original manufacturer or authorized distributors?
All P4KA33AHE3/73 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 P4KA33AHE3/73 meets industry standards.
7.What is the process for return or replacement of P4KA33AHE3/73?
All P4KA33AHE3/73 units undergo pre-shipment inspection (PSI). If there is an issue with P4KA33AHE3/73, 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 P4KA33AHE3/73 part is unused and in its original packaging.
Return procedure for P4KA33AHE3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4KA33AHE3/73 Tags
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