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Vishay General Semiconductor - Diodes Division BZW04-78HE3/54
- Part No.:
- BZW04-78HE3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-78HE3/54.pdf
- Description:
- TVS DIODE 78VWM 125VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:2,129
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Product details
Overview
BZW04-78HE3/54 from Vishay General Semiconductor is a bidirectional Transient Voltage Suppressor (TVS) diode in DO-41 package, designed for robust overvoltage protection of signal and power lines. It features a 78 V standoff voltage (VWM), 86.5–95.5 V breakdown voltage (VBR) at 1 mA, 125 V clamping voltage (VC) at 3.2 A peak pulse current (IPPM), and 400 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed in automotive sensor interfaces and industrial I/O modules.
For engineers reviewing the BZW04-78HE3/54 datasheet, BZW04-78HE3/54 pinout, BZW04-78HE3/54 application, or BZW04-78HE3/54 equivalent, key selection criteria include its AEC-Q101 qualification, bidirectional polarity, DO-41 mechanical compatibility, low leakage (<1 μA at VWM), and temperature coefficient of VBR (0.105 %/°C).
Technical Context
This device operates as a voltage-clamping surge protector using an avalanche junction structure. Its bidirectional symmetry enables protection against both positive and negative transients without polarity constraints, and its glass-passivated chip junction ensures stable performance under repeated surge stress.
The 400 W peak pulse power rating is defined per 10/1000 μs waveform at TA = 25 °C and derates linearly above 25 °C per Fig. 2; maximum junction temperature is 175 °C, and thermal resistance from junction to lead (RθJL) supports operation up to TL = 75 °C with 1.5 W steady-state dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78.0 V - Maximum continuous reverse working voltage before clamping initiates |
| VBR (min/max) | 86.5 V / 95.5 V at IT = 1 mA - Ensures reliable avalanche conduction onset across manufacturing lot |
| VC @ IPPM | 125 V at 3.2 A - Clamped voltage during 10/1000 μs surge, limiting downstream IC stress |
| PPPM | 400 W - Sustains high-energy transients common in automotive load-dump or inductive switching |
| ID @ VWM | <1.0 μA - Negligible leakage current preserves signal integrity in high-impedance circuits |
| TJ max. | 175 °C - Enables use in under-hood automotive environments and industrial enclosures |
| Package | DO-41 (DO-204AL) - Industry-standard axial-leaded package with UL 94 V-0 epoxy molding |
Pinout & Package
DO-41 (DO-204AL) package: axial-leaded, glass-passivated silicon junction, matte tin-plated leads compliant with J-STD-002 and JESD22-B102 solderability standards. No polarity marking - bidirectional operation confirmed by "B" suffix in family designation (BZW04-78B series); BZW04-78HE3/54 is the AEC-Q101 qualified variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Identical avalanche behavior in both directions - no cathode band; interchangeable lead orientation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics including engine control, body modules, and ADAS sensor interfaces |
| Glass passivated junction | Enhances long-term reliability and moisture resistance versus epoxy-passivated alternatives |
| 400 W 10/1000 μs pulse rating | Withstands repetitive surges up to 0.01% duty cycle - suitable for CAN/LIN bus and RS-485 protection |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a) |
| JESD201 Class 2 whisker resistance | HE3 suffix confirms enhanced mitigation of tin whisker growth in high-reliability applications |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting analog outputs of pressure/temperature sensors in engine bay environments exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between signal line and ground, responding within <1 ns to transients exceeding 78 V. Use Value: Prevents latch-up or permanent damage to 12-bit ADC front-ends while maintaining sub-μA bias current integrity. |
Use Scenario: Safeguarding 24 V DC digital input channels on PLC modules subjected to relay coil flyback and ESD events. IC Role / Device Role / Timing Role: Standoff-mode TVS shunting surge energy away from optocoupler input stages during field-wiring faults. Use Value: Enables >20 kV contact ESD immunity (IEC 61000-4-2) and 1 kV/500 A surge survivability (IEC 61000-4-5) without derating. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Shielding RS-485 transceivers in outdoor security camera links from lightning-induced surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Common-mode clamp between A/B differential lines and chassis ground, operating symmetrically in both polarities. Use Value: Maintains signal integrity up to 10 Mbps while limiting common-mode voltage excursion to ≤125 V during 10/1000 μs threats. |
Use Scenario: Secondary-side transient suppression on 5 V/12 V USB-C PD adapter output rails against hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Fast-response voltage limiter placed after DC-DC converter, clamping output overvoltage before reaching connected devices. Use Value: Complies with USB-IF compliance test requirements for output overvoltage protection (OVP) with <100 ns response time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78A-E3/52 | Unidirectional; SMA package (surface-mount); 78 V VWM; 100 W PPPM (lower surge capacity) | Limited to PCB space-constrained designs where axial DO-41 layout is impractical | Select when automated assembly and board density outweigh need for 400 W surge handling |
| P6KE78CA | DO-15 package; same 78 V VWM and bidirectional function; 600 W PPPM; higher VC (129 V); non-AEC-Q101 | Higher surge margin but lacks automotive qualification and has larger footprint than DO-41 | Prefer for industrial mains-input protection where AEC-Q101 is not required and 600 W headroom is critical |
Compared with BZW04-78HE3/54, SMBJ78A-E3/52 trades surge robustness and through-hole manufacturability for compact SMT integration, while P6KE78CA offers greater pulse power but sacrifices automotive qualification and introduces larger mechanical envelope - making BZW04-78HE3/54 optimal for cost-sensitive, AEC-Q101–mandated automotive signal-line protection.
Availability
BZW04-78HE3/54 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line drivers, and consumer power adapter outputs requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for BZW04-78HE3/54 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, automotive qualification, and industrial-grade performance.
The BZW04 series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-reliability transient suppression in harsh environments - targeting automotive, industrial automation, and infrastructure equipment where surge immunity and long-term stability are critical.
FAQ
What is the polarity configuration of BZW04-78HE3/54?
BZW04-78HE3/54 is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive- and negative-going transients. Unlike unidirectional variants, it carries no cathode band marking and functions identically regardless of lead orientation - confirmed by its inclusion in the BZW04-xxB family and documented electrical symmetry in the Vishay datasheet (Document Number 88316, page 3).
Is BZW04-78HE3/54 qualified for automotive applications?
Yes, BZW04-78HE3/54 is AEC-Q101 qualified, as indicated by the "HE3" suffix per Vishay's ordering nomenclature (page 4, Note 1). This certification validates its performance under accelerated stress tests including temperature cycling, humidity bias, and high-temperature operating life - making it suitable for engine control units, body electronics, and ADAS sensor nodes.
What is the clamping voltage of BZW04-78HE3/54 under surge conditions?
The maximum clamping voltage (VC) of BZW04-78HE3/54 is 125 V at a peak pulse current (IPPM) of 3.2 A, measured with a 10/1000 μs waveform at TA = 25 °C. This value is specified in the Electrical Characteristics table (page 2) and defines the upper voltage limit imposed on protected circuitry during standardized surge events.
How does the HE3 suffix differ from E3 in BZW04-78HE3/54?
The "HE3" suffix denotes RoHS-compliant construction with JESD201 Class 2 whisker resistance and AEC-Q101 qualification, whereas "E3" indicates RoHS compliance and commercial-grade qualification only. For BZW04-78HE3/54, this means enhanced reliability for automotive and high-reliability industrial use - verified via accelerated whisker testing and extended environmental stress screening.
What package type and dimensions does BZW04-78HE3/54 use?
BZW04-78HE3/54 uses the DO-41 (DO-204AL) axial-leaded package, with overall length ≥25.4 mm, body diameter 2.0–2.7 mm, and lead diameter 0.71–0.86 mm (per page 5 mechanical outline). The molded epoxy case meets UL 94 V-0 flammability rating, and leads are matte tin-plated for solderability per J-STD-002.
BZW04-78HE3/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AL, DO-41, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 78V
- Voltage - Breakdown (Min):
- 86.5V
- Voltage - Clamping (Max) @ Ipp:
- 125V
- Current - Peak Pulse (10/1000µs):
- 3.2A
- 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)
BZW04-78HE3/54 FAQ
1.How can I place an order for BZW04-78HE3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-78HE3/54 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 BZW04-78HE3/54 reliable?
The price and inventory of BZW04-78HE3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-78HE3/54 is usually 5 days.
3.What payment methods are accepted for BZW04-78HE3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-78HE3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-78HE3/54?
BZW04-78HE3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-78HE3/54 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 BZW04-78HE3/54?
For technical support, including BZW04-78HE3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-78HE3/54 requirements.
6.How does Aetrix verify that BZW04-78HE3/54 is sourced from the original manufacturer or authorized distributors?
All BZW04-78HE3/54 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 BZW04-78HE3/54 meets industry standards.
7.What is the process for return or replacement of BZW04-78HE3/54?
All BZW04-78HE3/54 units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-78HE3/54, 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 BZW04-78HE3/54 part is unused and in its original packaging.
Return procedure for BZW04-78HE3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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