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Vishay General Semiconductor - Diodes Division BZG04-18TR3
- Part No.:
- BZG04-18TR3
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
BZG04-18TR3.pdf
- Description:
- TVS DIODE 18VWM 31VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,598
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Product details
Overview
BZG04-18TR3 from Vishay Semiconductors is a glass-passivated, surface-mount Zener diode designed for transient voltage suppression in power rails and signal lines. It features a nominal Zener voltage of 18 V, 300 W non-repetitive peak surge power (10/1000 µs), 50 A peak forward surge current, and DO-214AC (SMA) package - used in automotive power supply clamping and industrial I/O protection.
For engineers reviewing the BZG04-18TR3 datasheet, BZG04-18TR3 pinout, BZG04-18TR3 application, or BZG04-18TR3 equivalent, key selection criteria include clamping voltage at 9.7 A (31 V), junction-to-lead thermal resistance (25 K/W), standoff voltage (18 V), surge capability (300 W), and RoHS-compliant lead-free construction.
Technical Context
The BZG04-18TR3 operates as a unidirectional voltage-clamping device with a precisely defined Zener breakdown voltage (20.8 V min, 25.6 V max at 25 mA) and fast response time (≤1 ps). Its glass-passivated junction ensures stable leakage current (<5 µA at 14.4 V) and high reliability under repetitive surge stress.
Thermal management relies on low junction-to-lead resistance (25 K/W) and mounting-dependent junction-to-ambient resistance (100–150 K/W), enabling robust operation up to 150 °C junction temperature. The device is rated for 3 W steady-state dissipation at 100 °C ambient when RthJA < 25 K/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20.8 V min / 25.6 V max @ 25 mA - defines precise clamping threshold for overvoltage events |
| Clamping Voltage (VCL) | 31 V @ 9.7 A - maximum voltage seen during 10/1000 µs surge, critical for downstream IC protection |
| Peak Surge Power | 300 W @ 10/1000 µs - enables handling of high-energy transients without failure |
| Junction-to-Lead Rth | 25 K/W - supports efficient heat transfer to PCB copper, essential for sustained surge duty |
| Standoff Voltage (VR) | 18 V - maximum continuous reverse voltage before significant leakage begins |
| Leakage Current | <5 µA @ 14.4 V - ensures minimal standby power loss and signal integrity in high-impedance circuits |
| Package | DO-214AC (SMA) - industry-standard SMD outline compatible with automated assembly and IPC-7351 footprints |
Pinout & Package
DO-214AC (SMA) package: molded epoxy body, axial leads trimmed and formed for surface-mount use; cathode indicated by band; weight ≈ 77 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path / surge return node | Connected to ground or low-impedance return path during transient clamping |
| Cathode | Zener reference terminal / clamping output | Connected to protected line; conducts when voltage exceeds VZ, shunting surge current |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable Zener characteristics and <5 µA leakage at 80% VZ, critical for precision biasing and low-power systems |
| 300 W surge rating (10/1000 µs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV) without degradation when properly mounted |
| Fast response time ≤1 ps | Clamps ESD and lightning-induced transients before sensitive logic or analog circuitry is damaged |
| RoHS-compliant, lead-free | Meets EU Directive 2002/95/EC and WEEE 2002/96/EC; suitable for consumer, industrial, and automotive production |
| DO-214AC package | Standardized footprint allows drop-in replacement across multiple Zener families and simplifies PCB layout reuse |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: 12 V battery rail in engine control units exposed to load dump (ISO 7637-2 Pulse 5a, up to 60 V). IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed between power input and DC/DC converter input. Use Value: Clamps surge to ≤31 V within picoseconds, preventing damage to 36 V-rated buck controller and maintaining system uptime. | Use Scenario: 24 V digital input channel in programmable logic controller subject to field-wiring induced surges. IC Role / Device Role / Timing Role: Primary clamping element ahead of optocoupler input and series current-limiting resistor. Use Value: Limits voltage to safe level for optocoupler LED (max 30 V), ensuring reliable isolation barrier integrity during 1 kV/µs transients. |
| Telecom Line Interface Protection | Medical Equipment Power Entry Filtering |
Use Scenario: -48 V DC power feed in remote radio head with risk of induced lightning surges on long cable runs. IC Role / Device Role / Timing Role: Reverse-biased Zener clamp on power input, coordinated with upstream GDT and series impedance. Use Value: Provides low-clamping-voltage backup to gas discharge tube, reducing let-through energy to <10 mJ for downstream DC/DC and monitoring ICs. | Use Scenario: AC/DC adapter secondary-side 12 V output feeding patient-connected monitoring circuitry. IC Role / Device Role / Timing Role: Secondary overvoltage limiter after primary MOV and fuse, guarding against regulator failure modes. Use Value: Guarantees output never exceeds 31 V even during catastrophic linear regulator short, satisfying IEC 60601-1 creepage and safety isolation requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A | Higher clamping voltage (29.2 V @ 11.9 A); same DO-214AA package; lower surge rating (600 W vs. 300 W) | Designed for bidirectional TVS use; lacks Zener-specific tight VZ tolerance and low-leakage optimization | Select SMBJ18A only if bidirectional surge immunity is required; BZG04-18TR3 preferred for unidirectional precision clamping |
| P6SMB18A | Same DO-214AA package; higher clamping (29.2 V @ 11.9 A); identical 300 W surge rating but higher leakage (≤10 µA @ 14.4 V) | General-purpose TVS; not optimized for low-leakage bias networks or precision voltage references | Choose P6SMB18A for cost-sensitive industrial designs where leakage <5 µA is not critical; BZG04-18TR3 for medical or low-power sensor nodes |
Compared with SMBJ18A and P6SMB18A, the BZG04-18TR3 delivers tighter Zener voltage control (20.8–25.6 V), lower leakage (<5 µA), and glass-passivated stability - making it superior for applications requiring predictable clamping onset and minimal standby current, such as battery-powered sensors and precision power monitors.
Availability
BZG04-18TR3 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC digital I/O protection, and telecom line interface protection requiring stable component supply and full traceability.
Supply support for BZG04-18TR3 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 Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, optoelectronics, and passive components for demanding industrial and automotive environments.
The BZG04-Series is engineered specifically for high-energy transient suppression in harsh environments - emphasizing surge robustness, thermal stability, and long-term parameter consistency under repeated stress.
FAQ
What is the Zener voltage tolerance of the BZG04-18TR3?
The BZG04-18TR3 has a specified Zener voltage range of 20.8 V minimum to 25.6 V maximum at 25 mA test current, per Vishay Document 85594 Rev. 2.2. This ±13% tolerance reflects the inherent spread of the 18 V nominal rating and is verified across production lots. The BZG04-18TR3 maintains this specification at 25 °C ambient and must be derated for elevated junction temperatures.
Does the BZG04-18TR3 support bidirectional transient suppression?
No, the BZG04-18TR3 is a unidirectional Zener diode intended for reverse-bias clamping only. It does not provide symmetrical protection like a bidirectional TVS. For applications requiring protection against both positive and negative transients, a separate BZG04-18TR3 must be used in anti-parallel configuration, or a dedicated bidirectional device such as SMBJ18CA should be selected instead of the BZG04-18TR3.
What is the maximum allowable junction temperature for continuous operation of the BZG04-18TR3?
The BZG04-18TR3 has a maximum junction temperature rating of 150 °C, as specified in the Absolute Maximum Ratings table of Vishay's Document 85594. Continuous operation at this temperature requires careful thermal design - including adequate copper area, low RthJA mounting (e.g., on Al₂O₃ ceramic), and derating of power dissipation per the thermal curves. The BZG04-18TR3 must not exceed this limit to ensure long-term reliability.
How does the clamping voltage of the BZG04-18TR3 compare to its Zener voltage?
The clamping voltage of the BZG04-18TR3 is 31 V at 9.7 A (10/1000 µs pulse), which is significantly higher than its Zener voltage (20.8–25.6 V at 25 mA). This difference reflects dynamic impedance rise under high-current surge conditions. Engineers must use the 31 V clamping value - not the Zener voltage - when verifying downstream component voltage ratings in surge scenarios involving the BZG04-18TR3.
Is the BZG04-18TR3 suitable for use in RoHS-compliant and lead-free soldering processes?
Yes, the BZG04-18TR3 is explicitly certified as lead (Pb)-free and compliant with RoHS Directive 2002/95/EC and WEEE 2002/96/EC, as stated in Vishay's datasheet. Its terminations are compatible with standard lead-free reflow profiles (e.g., JEDEC J-STD-020), and the device undergoes qualification testing per AEC-Q200 for moisture sensitivity and thermal cycling - confirming suitability for BZG04-18TR3 in high-reliability, lead-free manufacturing environments.
BZG04-18TR3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- BZG04
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20.8V
- Voltage - Clamping (Max) @ Ipp:
- 31V
- Current - Peak Pulse (10/1000µs):
- 9.7A
- Power - Peak Pulse:
- 300W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 610pF @ 1MHz
- Operating Temperature:
- -
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
BZG04-18TR3 FAQ
1.How can I place an order for BZG04-18TR3 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZG04-18TR3 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 BZG04-18TR3 reliable?
The price and inventory of BZG04-18TR3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZG04-18TR3 is usually 5 days.
3.What payment methods are accepted for BZG04-18TR3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZG04-18TR3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZG04-18TR3?
BZG04-18TR3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZG04-18TR3 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 BZG04-18TR3?
For technical support, including BZG04-18TR3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZG04-18TR3 requirements.
6.How does Aetrix verify that BZG04-18TR3 is sourced from the original manufacturer or authorized distributors?
All BZG04-18TR3 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 BZG04-18TR3 meets industry standards.
7.What is the process for return or replacement of BZG04-18TR3?
All BZG04-18TR3 units undergo pre-shipment inspection (PSI). If there is an issue with BZG04-18TR3, 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 BZG04-18TR3 part is unused and in its original packaging.
Return procedure for BZG04-18TR3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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