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Vishay General Semiconductor - Diodes Division P4KE33A-E3/73
- Part No.:
- P4KE33A-E3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
P4KE33A-E3/73.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:6,961
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Product details
Overview
P4KE33A-E3/73 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode in DO-41 package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 31.4 V minimum breakdown voltage (VBR), 28.2 V maximum stand-off voltage (VWM), 45.7 V clamping voltage (VC) at 8.8 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the P4KE33A-E3/73 datasheet, P4KE33A-E3/73 pinout, P4KE33A-E3/73 application, or P4KE33A-E3/73 equivalent, key selection criteria include clamping performance under 8.8 A surge, unidirectional polarity for DC line protection, DO-41 leaded package compatibility with through-hole PCB layouts, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM (28.2 V), it transitions from high-impedance blocking to low-impedance conduction at VBR (31.4–34.7 V), limiting transient energy to ≤45.7 V across the protected circuit. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at VWM).
The device sustains 400 W peak pulse power per 10/1000 μs waveform with 0.01% duty cycle, exhibits 0.098 %/°C temperature coefficient of VBR, and maintains operation from –55 °C to +175 °C junction temperature. Thermal resistance is 66 °C/W (junction-to-lead) and 100 °C/W (junction-to-ambient, LLead = 10 mm).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28.2 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC working margin. |
| VBR (min/max) | 31.4 V / 34.7 V at 1.0 mA - Confirmed breakdown range ensures reliable turn-on without premature conduction. |
| VC @ IPPM | 45.7 V at 8.8 A - Clamping voltage during 10/1000 μs surge; determines maximum stress on downstream ICs. |
| PPPM | 400 W - Peak transient energy absorption capability; validates protection against IEC 61000-4-5 Level 3 surges. |
| IPPM | 8.8 A - Peak pulse current handling at rated clamping voltage; sets minimum trace width and fuse coordination. |
| TJ max. | +175 °C - Maximum junction temperature enables use in under-hood automotive environments without derating. |
| RθJL | 66 °C/W - Low junction-to-lead thermal resistance supports sustained surge dissipation with minimal PCB copper. |
Pinout & Package
Package: DO-41 (DO-204AL) molded epoxy case with matte tin-plated leads; meets UL 94 V-0 flammability rating and J-STD-002 solderability standards. Cathode indicated by color band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse surge return path | Connected to ground or low-impedance return plane; completes clamping loop during transient events. |
| Cathode | Reverse voltage sensing / Clamping output node | Connected to protected line (e.g., 24 V rail); conducts when VLINE > VBR, diverting surge current to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Ensures stable VBR tolerance (±5%), low leakage (<1.0 μA), and long-term reliability under thermal cycling. |
| 400 W peak pulse power (10/1000 μs) | Validates compliance with ISO 7637-2 Pulse 1/2b/5a and IEC 61000-4-5 surge immunity requirements. |
| AEC-Q101 qualified (E3 suffix variant) | Confirms suitability for automotive powertrain and body electronics where extended temperature and lifetime validation are mandatory. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ESD or inductive kick), improving system-level robustness. |
| Solder dip 275 °C max. for 10 s | Supports standard wave-soldering processes without parametric shift or mechanical delamination. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 12 V/24 V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional shunt clamp on main supply rail upstream of DC-DC converters and microcontrollers. Use Value: Limits transient voltage to ≤45.7 V, preventing latch-up or gate oxide damage in downstream 3.3 V/5 V logic and power ICs. |
Use Scenario: Analog sensor outputs (e.g., pressure, temperature) routed across noisy factory floors with motor drives and solenoids. IC Role / Device Role / Timing Role: Point-of-entry protection on signal lines before instrumentation amplifiers or ADC inputs. Use Value: Clamps fast EFT bursts (IEC 61000-4-4) and inductive spikes without adding capacitance that degrades signal bandwidth. |
| Consumer Power Adapter Input Stage | Telecom DC Feeder Protection |
|
Use Scenario: AC-DC adapter primary-side rectified output subjected to lightning-induced surges on mains input. IC Role / Device Role / Timing Role: Secondary-side overvoltage limiter between bridge rectifier and bulk capacitor. Use Value: Absorbs 400 W surges without failure, maintaining regulation integrity and avoiding catastrophic capacitor rupture. |
Use Scenario: -48 V DC telecom feeder lines entering base station cabinets with exposure to nearby lightning strikes. IC Role / Device Role / Timing Role: Bidirectional-capable variant not applicable; this unidirectional part used on positive rail only with series fuse coordination. Use Value: Provides predictable 28.2 V standoff and 45.7 V clamping, enabling precise overvoltage shutdown thresholds in power management ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A | DO-214AA package; 33 V VWM, 48.4 V VC @ 8.3 A; 600 W PPPM; surface-mount. | Requires SMT reflow process; higher clamping voltage but greater surge capacity; smaller footprint. | Select SMBJ33A when board space is constrained and automated assembly is preferred over through-hole mounting. |
| 1.5KE33A | DO-201AD package; same VWM/VBR/VC specs; 1500 W PPPM; larger case, higher IPPM (32.4 A). | Used where higher single-event surge energy (e.g., direct lightning coupling) must be absorbed without degradation. | Choose 1.5KE33A for industrial mains interfaces or outdoor equipment requiring >1 kW surge margin. |
Compared with SMBJ33A and 1.5KE33A, the P4KE33A-E3/73 offers optimal balance of proven DO-41 reliability, AEC-Q101 qualification, and 400 W surge handling in cost-sensitive through-hole designs-making it ideal for automotive body control modules and legacy industrial controllers.
Availability
P4KE33A-E3/73 is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, and telecom DC feeder circuits requiring stable component supply across multi-year production cycles.
Supply support for P4KE33A-E3/73 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 is a global leader in discrete semiconductors, specializing in diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade qualification.
The P4KE33A-E3/73 belongs to Vishay's TRANSZORB® TVS family, engineered specifically for robust, standardized transient suppression in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of the P4KE33A-E3/73 under a 10/1000 μs surge?
The P4KE33A-E3/73 has a maximum clamping voltage (VC) of 45.7 V at 8.8 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88365 and defines the upper voltage limit imposed on protected circuitry during transient events. The P4KE33A-E3/73 maintains this clamping performance across its specified operating temperature range.
Is the P4KE33A-E3/73 suitable for automotive applications?
Yes, the P4KE33A-E3/73 is AEC-Q101 qualified (as confirmed by the HE3 suffix variant and note in Vishay document 88365), and its DO-41 package, –55 °C to +175 °C operating range, and 400 W surge capability make it suitable for automotive body electronics, power distribution modules, and sensor interfaces. The P4KE33A-E3/73 meets critical reliability requirements for under-hood and cabin-mounted systems.
How does the P4KE33A-E3/73 differ from bidirectional TVS diodes like P4KE33CA?
The P4KE33A-E3/73 is unidirectional and features a cathode band for polarity identification, while P4KE33CA is bidirectional with no marking and symmetrical clamping in both directions. The P4KE33A-E3/73 has lower leakage (<1.0 μA at VWM) and is intended for DC line protection; P4KE33CA suits AC or floating signal lines. Their VBR and VC values differ due to internal construction-P4KE33A-E3/73 is not interchangeable with P4KE33CA without circuit review.
What is the thermal resistance of the P4KE33A-E3/73, and how does it affect layout design?
The P4KE33A-E3/73 has a typical junction-to-lead thermal resistance (RθJL) of 66 °C/W and junction-to-ambient (RθJA) of 100 °C/W with 10 mm lead length. This means effective heat transfer relies on adequate copper pour connected to both leads. For repeated surge events, designers should minimize trace length, use ≥2 oz copper, and avoid thermal isolation-critical for maintaining the P4KE33A-E3/73 within its 175 °C TJ limit.
Can the P4KE33A-E3/73 replace older P4KE33A variants without design changes?
Yes, the P4KE33A-E3/73 is a RoHS-compliant, commercial-grade drop-in replacement for legacy P4KE33A parts with identical electrical specifications, DO-41 mechanical dimensions, and pinout. The "E3/73" suffix denotes tape-and-reel packaging (73 = 13" reel, 5500 pcs) and JESD 201 Class 1A whisker resistance-no PCB or schematic modifications are required when upgrading to P4KE33A-E3/73.
P4KE33A-E3/73 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AL, DO-41, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Box (TB)
- Product Status:
- Active
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
P4KE33A-E3/73 FAQ
1.How can I place an order for P4KE33A-E3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4KE33A-E3/73 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 P4KE33A-E3/73 reliable?
The price and inventory of P4KE33A-E3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4KE33A-E3/73 is usually 5 days.
3.What payment methods are accepted for P4KE33A-E3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4KE33A-E3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4KE33A-E3/73?
P4KE33A-E3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4KE33A-E3/73 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 P4KE33A-E3/73?
For technical support, including P4KE33A-E3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4KE33A-E3/73 requirements.
6.How does Aetrix verify that P4KE33A-E3/73 is sourced from the original manufacturer or authorized distributors?
All P4KE33A-E3/73 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 P4KE33A-E3/73 meets industry standards.
7.What is the process for return or replacement of P4KE33A-E3/73?
All P4KE33A-E3/73 units undergo pre-shipment inspection (PSI). If there is an issue with P4KE33A-E3/73, 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 P4KE33A-E3/73 part is unused and in its original packaging.
Return procedure for P4KE33A-E3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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