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Vishay General Semiconductor - Diodes Division BZW04-78-E3/54
- Part No.:
- BZW04-78-E3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-78-E3/54.pdf
- Description:
- TVS DIODE 78VWM 125VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:2,836
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Product details
Overview
BZW04-78-E3/54 from Vishay General Semiconductor is a bidirectional Transient Voltage Suppressor (TVS) diode in DO-41 package, designed for robust overvoltage protection of sensitive electronics. It features a 78.0 V stand-off voltage (VWM), 86.5–95.5 V breakdown voltage (VBR) at 1.0 mA test current, 125 V maximum clamping voltage (VC) at 3.2 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive sensor signal lines, industrial I/O interfaces, and telecom power rails.
For engineers reviewing the BZW04-78-E3/54 datasheet, BZW04-78-E3/54 pinout, BZW04-78-E3/54 application, or BZW04-78-E3/54 equivalent, key selection criteria include its bidirectional polarity, AEC-Q101 qualification, DO-41 mechanical compatibility, low 0.105 %/°C VBR temperature coefficient, and 1.0 μA max reverse leakage at VWM, critical for low-power, high-reliability transient suppression in harsh environments.
Technical Context
This device operates as a voltage-clamped shunt protector: when transient voltage exceeds VBR, it avalanches rapidly (<1 ns response) to divert surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surges.
Rated for 400 W peak pulse power (10/1000 μs), it sustains 3.2 A IPPM while clamping to ≤125 V - enabling effective protection of 24 V and 48 V systems against ISO 7637-2 and IEC 61000-4-5 threats. Thermal derating begins above 25 °C ambient, with full power capability maintained up to TJ = 175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78.0 V - Maximum continuous working voltage before conduction; defines safe operating margin for 72–80 V nominal DC rails. |
| VBR (min/max) | 86.5 V / 95.5 V at 1.0 mA - Tight 10.4 % tolerance ensures predictable turn-on across production lots and temperature. |
| VC @ IPPM | 125 V at 3.2 A - Clamping voltage limits stress on protected ICs; enables safe operation with 24 V/48 V system margins. |
| PPPM | 400 W - Peak surge energy handling per 10/1000 μs pulse; supports automotive load-dump and inductive switching transients. |
| IPPM | 3.2 A - Peak current capacity determines minimum series impedance required for effective clamping. |
| TJ max | 175 °C - Junction temperature limit allows use in under-hood automotive and industrial enclosures without forced cooling. |
| Leakage @ VWM | 1.0 μA - Ultra-low standby current preserves battery life in always-on sensor nodes and remote monitoring devices. |
Pinout & Package
DO-41 (DO-204AL) axial-leaded package: hermetically sealed glass-passivated silicon junction in molded epoxy housing rated UL 94 V-0. Matte tin-plated leads comply with J-STD-002 and JESD22-B102 solderability standards. No polarity marking - bidirectional symmetry confirmed per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Identical terminals enable bidirectional clamping; no orientation required during PCB placement. |
| Lead 1 / Lead 2 | Thermal and electrical interface | Leads serve dual role: low-inductance surge current conduction and primary heat dissipation path to PCB copper. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and surge endurance - suitable for engine control, ADAS, and body electronics. |
| Glass passivated junction | Eliminates surface contamination sensitivity and improves long-term VBR stability under humid or contaminated environments. |
| 400 W peak pulse power (10/1000 μs) | Supports repeated exposure to high-energy transients without parameter drift or catastrophic failure - essential for industrial motor drives. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns response), improving protection fidelity for high-speed digital interfaces. |
| RoHS-compliant E3 suffix | Meets JESD201 Class 1A whisker resistance - ensures lead integrity in reflow-soldered assemblies over extended thermal cycles. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from load dump and inductive switching spikes in 12 V/24 V vehicle subsystems. IC Role / Device Role / Timing Role: Bidirectional shunt clamping element placed directly at connector entry point to limit transient voltage before reaching signal conditioning ICs. Use Value: Maintains signal integrity by clamping to ≤125 V during 400 W surges, preventing latch-up or permanent damage to 5 V/3.3 V microcontrollers and ADCs. |
Use Scenario: Safeguarding digital input/output modules in programmable logic controllers exposed to relay coil flyback, motor contactor noise, and AC line coupling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC field wiring, coordinated with upstream fusing and filtering to meet IEC 61000-4-4/5 immunity requirements. Use Value: Enables >100,000 surge cycles at rated power due to low thermal resistance and stable VBR, reducing field failure rates in factory automation equipment. |
| Telecom Power Rail Protection | Consumer Appliance Motor Control |
Use Scenario: Securing 48 V PoE-powered Ethernet switches and base station RF front-end supplies against lightning-induced surges and hot-swap transients. IC Role / Device Role / Timing Role: Secondary-level TVS on DC-DC converter inputs, complementing primary MOV-based AC-side protection to achieve full IEC 61000-4-5 Level 4 compliance. Use Value: 0.105 %/°C VBR tempco ensures consistent clamping across -40 °C to +85 °C operating range, critical for outdoor telecom deployments. |
Use Scenario: Shielding microcontroller GPIOs and gate drivers in washing machine, HVAC, and power tool motor control boards from brush-commutator noise and back-EMF. IC Role / Device Role / Timing Role: Localized transient suppressor mounted adjacent to MOSFET half-bridge outputs to absorb inductive kickback before it propagates into logic circuitry. Use Value: 1.0 μA max leakage at 78 V VWM prevents unnecessary standby power drain in energy-efficient appliances meeting IECEE/ErP standards. |
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 | Unidirectional; SMA package (surface-mount); 78 V VWM; 100 W lower PPPM (300 W vs. 400 W) | Requires polarity-aware layout; better suited for space-constrained PCBs where axial DO-41 is impractical | Select SMBJ78A only if board real estate is constrained and unidirectional protection suffices for the signal path. |
| P6KE78CA | Same DO-41 package and bidirectional function; 78 V VWM; but 600 W PPPM and higher VC (135 V) - looser VBR tolerance (10 % vs. 10.4 %) | Higher clamping voltage reduces protection margin for low-voltage ICs; preferred where higher surge energy must be absorbed | Choose P6KE78CA when system-level testing requires >400 W surge handling, accepting trade-off of elevated VC. |
Compared with BZW04-78-E3/54, SMBJ78A offers compact SMT fit but sacrifices 25 % peak power and polarity flexibility, while P6KE78CA delivers greater surge headroom at the cost of reduced clamping precision - making BZW04-78-E3/54 the optimal balance of AEC-Q101 reliability, DO-41 serviceability, and tight 125 V clamping for 24–48 V industrial and automotive designs.
Availability
BZW04-78-E3/54 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom power rail protection requiring stable component supply, AEC-Q101 traceability, and DO-41 through-hole assembly compatibility.
Supply support for BZW04-78-E3/54 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The BZW04 series was engineered specifically for high-energy transient suppression in harsh environments, emphasizing AEC-Q101 qualification, tight parametric tolerances, and robust glass-passivated junctions for long-term field reliability.
FAQ
What is the polarity configuration of BZW04-78-E3/54?
BZW04-78-E3/54 is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients without polarity marking on the DO-41 package. This eliminates orientation concerns during manual or automated assembly and ensures protection for AC-coupled or differential signal paths - a key distinction from unidirectional variants like BZW04-78A.
Is BZW04-78-E3/54 qualified for automotive applications?
Yes, BZW04-78-E3/54 is AEC-Q101 qualified, having passed rigorous stress tests including temperature cycling, humidity bias, and high-acceleration surge endurance. Its 175 °C maximum junction temperature, low leakage, and stable VBR tempco make it suitable for under-hood and chassis-mounted automotive electronics such as body control modules and ADAS sensor interfaces.
What does the "E3/54" suffix indicate in BZW04-78-E3/54?
The "E3" denotes RoHS-compliant construction meeting JESD201 Class 1A whisker resistance, while "/54" specifies packaging in 13-inch paper tape and reel with 550 units per reel - standard for automated SMT placement despite its axial DO-41 form factor. This format ensures compatibility with pick-and-place feeders and traceable lot control for high-volume manufacturing.
How does BZW04-78-E3/54 compare to P6KE78CA in clamping performance?
BZW04-78-E3/54 clamps to 125 V at 3.2 A, whereas P6KE78CA clamps to 135 V at 3.3 A. The 10 V lower clamping voltage of BZW04-78-E3/54 provides superior protection margin for 3.3 V and 5 V ICs in 24 V systems. Both use DO-41 packages, but BZW04-78-E3/54 offers tighter VBR tolerance (±5.2 % vs. ±10 %) and AEC-Q101 certification not guaranteed for P6KE78CA.
Can BZW04-78-E3/54 be used in parallel for higher surge current handling?
No - BZW04-78-E3/54 should not be paralleled without external balancing resistors due to inherent VBR mismatch between units, which causes uneven current sharing and potential thermal runaway. For higher IPPM, select a single higher-rated device (e.g., BZW04-85-E3/54) or verify matched-bin pairing per Vishay's application guidance; standard production lots are not binned for parallel operation.
BZW04-78-E3/54 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
BZW04-78-E3/54 FAQ
1.How can I place an order for BZW04-78-E3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-78-E3/54 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 BZW04-78-E3/54 reliable?
The price and inventory of BZW04-78-E3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-78-E3/54 is usually 5 days.
3.What payment methods are accepted for BZW04-78-E3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-78-E3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-78-E3/54?
BZW04-78-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-78-E3/54 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 BZW04-78-E3/54?
For technical support, including BZW04-78-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-78-E3/54 requirements.
6.How does Aetrix verify that BZW04-78-E3/54 is sourced from the original manufacturer or authorized distributors?
All BZW04-78-E3/54 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 BZW04-78-E3/54 meets industry standards.
7.What is the process for return or replacement of BZW04-78-E3/54?
All BZW04-78-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-78-E3/54, 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 BZW04-78-E3/54 part is unused and in its original packaging.
Return procedure for BZW04-78-E3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW04-78-E3/54 Tags
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