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Vishay General Semiconductor - Diodes Division BZW04P37HE3/73
- Part No.:
- BZW04P37HE3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04P37HE3/73.pdf
- Description:
- TVS DIODE 36.8VWM 59.3VC DO204AL
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
BZW04P37HE3/73 from Vishay General Semiconductor is a bi-directional TransZorb® transient voltage suppressor (TVS) diode designed for robust overvoltage protection in signal and power lines. It features a 36.8 V stand-off voltage (VWM), 400 W peak pulse power (10/1000 μs), clamping voltage of 59.3 V at 6.7 A, AEC-Q101 qualification, and DO-204AL (DO-41) package - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the BZW04P37HE3/73 datasheet, BZW04P37HE3/73 pinout, BZW04P37HE3/73 application, or BZW04P37HE3/73 equivalent, key selection criteria include its bi-directional clamping behavior, 175 °C max junction temperature, low 0.101 %/°C VBR temperature coefficient, and compliance with IEC 61000-4-2/4-4/4-5 surge immunity standards.
Technical Context
This device operates as a voltage-clamped shunt protector: during transients exceeding 36.8 V, it avalanches to divert surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown and fast response (<1 ns), while the bi-directional configuration supports AC-coupled or floating signal paths without polarity constraints.
Rated for 400 W peak pulse power under 10/1000 μs waveform and 1.5 W steady-state dissipation, it sustains repetitive surges at ≤0.01 % duty cycle. The 6.7 A maximum peak pulse current (IPPM) and 59.3 V clamping voltage (VC) define its protective window for 24 V nominal systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 36.8 V - Maximum continuous reverse working voltage before clamping begins; sets operating margin for 24 V rail protection. |
| VBR @ IT=1 mA | 40.9–47.3 V - Breakdown voltage range defining reliable avalanche onset; ensures consistent triggering across temperature. |
| VC @ IPPM=6.7 A | 59.3 V - Clamping voltage under 400 W surge; limits stress on protected ICs such as CAN transceivers or microcontrollers. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 μs waveform; meets IEC 61000-4-5 Level 3 (1 kV line-to-ground). |
| IPPM | 6.7 A - Maximum non-repetitive surge current; determines minimum trace width and PCB layout clearance requirements. |
| TJmax | 175 °C - Maximum junction temperature; enables operation in under-hood automotive environments and industrial enclosures. |
| Temp. Coeff. of VBR | 0.101 %/°C - Low drift ensures stable clamping across -55 °C to +175 °C; critical for wide-temperature automotive applications. |
Pinout & Package
Package: DO-204AL (DO-41), axial-leaded, epoxy-molded case meeting UL 94 V-0 flammability rating. Matte tin-plated leads compliant with J-STD-002 and JESD22-B102 solderability standards. HE3 suffix denotes AEC-Q101 qualification and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (bi-directional) | Surge current path terminal | No polarity marking; symmetric conduction in both directions - simplifies placement on differential or AC-coupled lines. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - suitable for engine control, ADAS sensors, and body electronics. |
| Glass passivated junction | Ensures stable VBR and low leakage (<1 μA at VWM) over lifetime; eliminates risk of parametric shift in harsh environments. |
| 400 W peak pulse power (10/1000 μs) | Provides robust protection against ISO 7637-2 pulse 1/2a/3a and IEC 61000-4-5 surges without derating at 25 °C ambient. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ESD >30 kV), improving protection margin for sensitive analog front-ends. |
| RoHS-compliant, lead-free | Meets Directive 2011/65/EU and WEEE 2002/96/EC; HE3 suffix confirms full compliance including JESD201 Class 2 whisker mitigation. |
Applications
| Automotive Sensor Interface | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LIN/CAN bus nodes and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bi-directional shunt clamp placed between signal line and ground, responding within <1 ns to limit voltage excursion to ≤59.3 V. Use Value: Enables reliable operation of 3.3 V/5 V microcontrollers and analog signal conditioners in 12 V/24 V automotive systems per ISO 16750-2. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to field-wiring surges and relay contact bounce. IC Role / Device Role / Timing Role: Standoff-rated TVS on 24 V DC input channels, clamping transients induced by motor starter switching or lightning-induced coupling. Use Value: Prevents false triggering and latch-up in optocoupler inputs and Schmitt-trigger receivers, maintaining system uptime in factory automation. |
| Telecom Line Interface | Consumer Power Adapter ESD Protection |
Use Scenario: Shielding RS-485 transceiver pins and Ethernet PHY magnetics from ESD and surge events in network infrastructure equipment. IC Role / Device Role / Timing Role: Bi-directional transient suppressor across differential pairs or supply rails, leveraging symmetric clamping to preserve signal integrity. Use Value: Passes IEC 61000-4-2 ±8 kV contact discharge and IEC 61000-4-5 0.5 kV line-to-ground tests without degradation. |
Use Scenario: Adding secondary-level surge suppression on DC output rails of wall-mounted AC/DC adapters used in smart home devices. IC Role / Device Role / Timing Role: Final-stage clamp after primary MOV and fuse, limiting residual voltage to protect USB-C PD controllers and battery management ICs. Use Value: Extends adapter lifetime under repeated 100 V/μs fast transients and meets UL 62368-1 Annex D surge withstand requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36CA | Same DO-214AA package; 36 V VWM, 64.5 V VC @ 6.2 A, 600 W PPPM; higher clamping voltage, surface-mount only. | Preferred for space-constrained PCBs where reflow assembly is required; less suitable for through-hole legacy designs. | Select SMBJ36CA when board real estate is limited and SMT process capability exists; verify thermal relief pad design for 1.5 W dissipation. |
| 1.5KE39CA | DO-201AD package; 39 V VWM, 60.3 V VC @ 6.6 A, 1500 W PPPM; higher power but larger footprint and slower response due to higher junction capacitance. | Better suited for high-energy AC mains protection; over-specified for low-voltage signal line use. | Choose 1.5KE39CA only for applications requiring >1 kW surge handling; avoid in high-speed data lines due to ~100 pF CJ. |
Compared with SMBJ36CA and 1.5KE39CA, BZW04P37HE3/73 offers optimal balance of through-hole manufacturability, AEC-Q101 qualification, and precise 36.8 V standoff for 24 V systems - making it the preferred choice for automotive and industrial through-hole TVS deployments where reliability and standardization matter.
Availability
BZW04P37HE3/73 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and telecom line interface applications requiring stable component supply, long-term lifecycle support, and AEC-Q101 assurance.
Supply support for BZW04P37HE3/73 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific performance.
The BZW04P series belongs to Vishay's TransZorb® TVS family, engineered specifically for high-reliability transient suppression in automotive, industrial, and communications systems where robustness against ESD, EFT, and surge is mandatory.
FAQ
What is the clamping voltage of BZW04P37HE3/73 and how does it protect downstream components?
The BZW04P37HE3/73 clamps at 59.3 V when subjected to its rated 6.7 A peak pulse current (10/1000 μs). This limits the maximum voltage seen by protected circuitry - such as microcontrollers or transceivers - ensuring stress remains below absolute maximum ratings. Its low clamping ratio (VC/VWM ≈ 1.61) reflects efficient energy diversion without excessive overshoot.
Is BZW04P37HE3/73 suitable for automotive applications, and what qualifications does it hold?
Yes, BZW04P37HE3/73 is AEC-Q101 qualified, as confirmed by the HE3 suffix and Vishay documentation. It meets automotive reliability requirements including temperature cycling, mechanical shock, and humidity testing - making it appropriate for engine control units, body electronics, and ADAS sensor interfaces operating from -55 °C to +175 °C junction temperature.
How does the bi-directional configuration of BZW04P37HE3/73 affect its usage compared to uni-directional TVS diodes?
The bi-directional configuration of BZW04P37HE3/73 allows it to suppress transients of either polarity on AC-coupled or floating lines - such as RS-485 differential pairs or transformer-isolated power rails - without requiring orientation during placement. Unlike uni-directional types, it has no cathode marking and delivers symmetrical clamping performance in both directions.
What is the maximum peak pulse current rating for BZW04P37HE3/73, and under what test conditions is it specified?
BZW04P37HE3/73 is rated for 6.7 A maximum peak pulse current (IPPM), measured using the standardized 10/1000 μs double-exponential waveform per IEC 61000-4-5. This rating applies at TA = 25 °C and assumes non-repetitive pulses with ≤0.01 % duty cycle; derating is required above 25 °C per Figure 2 in the datasheet.
Does BZW04P37HE3/73 require heatsinking, and what is its steady-state power dissipation capability?
BZW04P37HE3/73 has a steady-state power dissipation (PD) of 1.5 W when mounted on an infinite heatsink at lead temperature (TL) = 75 °C. In typical through-hole PCB layouts without dedicated heatsinking, continuous power handling is significantly lower - generally limited to ~0.5 W. It is intended for transient-only suppression, not sustained overvoltage conditions.
BZW04P37HE3/73 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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 36.8V
- Voltage - Breakdown (Min):
- 40.9V
- Voltage - Clamping (Max) @ Ipp:
- 59.3V
- Current - Peak Pulse (10/1000µs):
- 6.7A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
BZW04P37HE3/73 FAQ
1.How can I place an order for BZW04P37HE3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04P37HE3/73 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 BZW04P37HE3/73 reliable?
The price and inventory of BZW04P37HE3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04P37HE3/73 is usually 5 days.
3.What payment methods are accepted for BZW04P37HE3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04P37HE3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04P37HE3/73?
BZW04P37HE3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04P37HE3/73 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 BZW04P37HE3/73?
For technical support, including BZW04P37HE3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04P37HE3/73 requirements.
6.How does Aetrix verify that BZW04P37HE3/73 is sourced from the original manufacturer or authorized distributors?
All BZW04P37HE3/73 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 BZW04P37HE3/73 meets industry standards.
7.What is the process for return or replacement of BZW04P37HE3/73?
All BZW04P37HE3/73 units undergo pre-shipment inspection (PSI). If there is an issue with BZW04P37HE3/73, 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 BZW04P37HE3/73 part is unused and in its original packaging.
Return procedure for BZW04P37HE3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW04P37HE3/73 Tags
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