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Vishay General Semiconductor - Diodes Division BZG04-18TR
- Part No.:
- BZG04-18TR
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
BZG04-18TR.pdf
- Description:
- TVS DIODE 18VWM 31VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,409
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Product details
Overview
BZG04-18TR from Vishay Semiconductors is a glass-passivated Zener diode designed for transient voltage suppression in power rails and signal lines, with a nominal Zener breakdown voltage of 20.8 V at 25 mA, clamping voltage of 31 V at 9.7 A (10/1000 µs pulse), and surge power rating of 300 W. It features fast response time (≤1 ps), DO-214AC package, and RoHS-compliant lead-free construction.
For engineers reviewing the BZG04-18TR datasheet, BZG04-18TR pinout, BZG04-18TR application, or BZG04-18TR equivalent, key selection criteria include its 31 V clamping voltage under 9.7 A surge, 25 K/W junction-to-lead thermal resistance, 150 °C max junction temperature, and compatibility with high-energy transient protection in industrial power supplies and automotive ECUs.
Technical Context
The BZG04-18TR operates as a unidirectional voltage clamp, leveraging avalanche breakdown to limit transient overvoltages. Its glass-passivated junction ensures stable Zener characteristics and high reliability under repeated surge stress.
Designed for surface-mount PCB assembly in DO-214AC (SMC) outline, it delivers 300 W non-repetitive peak surge power at 10/1000 µs waveform and maintains clamping performance across -65 °C to +150 °C operating range with low junction capacitance (610 pF at 0 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20.8 V min at IZT = 25 mA - defines precise DC regulation threshold |
| Clamping Voltage (VCL) | 31 V max at IPP = 9.7 A (10/1000 µs) - limits peak transient voltage seen by protected circuitry |
| Surge Power (PZSM) | 300 W non-repetitive - enables handling of high-energy lightning or ESD transients |
| Junction Capacitance (Cj) | 610 pF at VR = 0 V, f = 1 MHz - impacts high-frequency signal integrity in data line protection |
| Thermal Resistance (RthJL) | 25 K/W junction-to-lead - supports efficient heat transfer to PCB copper when mounted per Fig. 1a |
| Standoff Voltage (VR) | 18 V max - maximum reverse voltage before significant leakage current begins |
Pinout & Package
Package: DO-214AC (SMC), surface-mount, plastic case with cathode band marking. Approximate weight: 77 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during forward bias; reference node for reverse-biased clamping | Connected to lower-potential side of protected line (e.g., GND or return path) |
| Cathode | Current exit during forward bias; clamping node during reverse avalanche | Connected to higher-potential side (e.g., VIN, signal line) to shunt surges to ground |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term stability of Zener voltage and leakage current under thermal cycling and humidity stress |
| Fast response time ≤1 ps | Enables effective suppression of nanosecond-scale ESD events before downstream ICs are damaged |
| Lead (Pb)-free & RoHS compliant | Meets EU Directive 2002/95/EC and WEEE 2002/96/EC for environmentally responsible manufacturing |
| High reliability in harsh environments | Rated for storage from -65 °C to +150 °C and operational junction up to 150 °C |
Applications
| Industrial Power Supply Protection | Automotive ECU Input Protection |
|---|---|
Use Scenario: Protecting 24 V DC input rails in programmable logic controllers against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed between input rail and chassis ground. Use Value: Clamps 31 V at 9.7 A surge, limiting stress on upstream rectifiers and downstream DC/DC controllers without derating. | Use Scenario: Safeguarding microcontroller I/O pins and CAN transceiver power inputs in engine control units exposed to battery transients. IC Role / Device Role / Timing Role: Standoff-rated Zener clamp on 12 V supply line, activated only during >18 V overvoltage events. Use Value: 610 pF junction capacitance avoids signal distortion on 500 kbps CAN bus while providing 300 W surge immunity. |
| Telecom Line Surge Suppression | Renewable Energy Inverter DC Link Protection |
Use Scenario: Secondary-level protection on PoE-powered Ethernet ports against induced lightning surges. IC Role / Device Role / Timing Role: Back-to-back configuration with another BZG04-18TR for bidirectional clamping on differential pairs. Use Value: Fast ≤1 ps response captures early surge rise time; DO-214AC footprint allows compact layout near RJ45 connector. | Use Scenario: Overvoltage clamping on 400 V DC link in solar inverters during grid fault recovery. IC Role / Device Role / Timing Role: Parallel-connected array (with current-sharing resistors) to distribute 300 W surge energy across multiple devices. Use Value: 25 K/W RthJL enables direct thermal coupling to heatsinked copper pour, sustaining repeated 10/1000 µs surges. |
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 @ 11.8 A); same DO-214AA package but lower surge rating (600 W vs. 300 W) | Optimized for lower-voltage 18 V systems with tighter clamping margin; not rated for 20.8 V Zener regulation | Select SMBJ18A only if system requires lower VBR tolerance and higher peak surge capacity, not Zener-regulated biasing |
| P6SMB18A | Same 18 V standoff, but 600 W PPP; larger DO-214AA package (7.1 × 6.2 mm vs. 7.1 × 6.2 mm identical footprint) | Designed for general-purpose TVS use, not precision Zener regulation; lacks specified Zener voltage min/max at IZT | Choose P6SMB18A for pure surge suppression where Zener voltage accuracy is secondary to energy handling |
Compared with SMBJ18A and P6SMB18A, the BZG04-18TR provides verified Zener voltage specification (20.8 V min at 25 mA) and tight clamping (31 V), making it suitable for combined regulation and transient suppression-whereas alternatives prioritize surge-only performance without guaranteed Zener regulation.
Availability
BZG04-18TR is available at Aetrix Electronics and suitable for industrial power supply protection, automotive ECU input safeguarding, and telecom line surge suppression requiring stable component supply and full traceability.
Supply support for BZG04-18TR 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 industrial, automotive, and computing markets.
The BZG04-Series is engineered for high-energy transient suppression in demanding environments, combining precision Zener regulation with robust surge capability in compact surface-mount packages.
FAQ
What is the Zener breakdown voltage tolerance for BZG04-18TR?
The BZG04-18TR has a minimum Zener breakdown voltage of 20.8 V at test current IZT = 25 mA, with no maximum specified in the datasheet. This value is measured under controlled conditions at Tamb = 25 °C and reflects the device's precise regulation point. The BZG04-18TR is not characterized with a ±% tolerance band; instead, its V(BR) is guaranteed ≥20.8 V, supporting designs requiring known lower-bound clamping behavior.
Can BZG04-18TR be used in bidirectional transient protection circuits?
The BZG04-18TR is a unidirectional Zener diode and must be paired with a second unit in series opposition (anode-to-anode or cathode-to-cathode) to achieve bidirectional clamping. Unlike dedicated bidirectional TVS diodes, the BZG04-18TR does not inherently suppress positive and negative transients alone. When configured back-to-back, the pair retains the BZG04-18TR's 31 V clamping level and 300 W surge rating per device, enabling symmetrical protection on AC or differential lines.
What is the maximum continuous power dissipation for BZG04-18TR at 100 °C ambient?
At Tamb = 100 °C and with thermal resistance RthJA < 25 K/W, the BZG04-18TR supports a maximum continuous power dissipation of 3 W. This rating assumes adequate PCB copper area and thermal vias to meet the required RthJA limit. Exceeding this power level risks junction temperature exceeding 150 °C, potentially degrading long-term reliability or causing thermal runaway.
How does the junction capacitance of BZG04-18TR affect high-speed signal lines?
The BZG04-18TR exhibits 610 pF junction capacitance at 0 V bias and 1 MHz, which may load high-impedance or high-frequency signal paths. For USB 2.0 or CAN FD lines, this capacitance can attenuate edge rates or cause reflections. To mitigate impact, place the BZG04-18TR as close as possible to the connector and use series impedance matching. The BZG04-18TR remains viable for lower-speed interfaces like RS-485 or 10/100BASE-TX where bandwidth constraints allow.
Is BZG04-18TR suitable for automotive applications requiring AEC-Q200 qualification?
The BZG04-18TR is not AEC-Q200 qualified. While it meets RoHS and operates across -65 °C to +150 °C, Vishay does not list it in AEC-Q200 stress-tested product families. For automotive-grade transient suppression, consider AEC-Q200-qualified alternatives such as the SMAJ18A-Q or SMCJ18A-Q. The BZG04-18TR may be used in non-safety-critical automotive subsystems where qualification is not mandated, but design validation per ISO 7637-2 remains essential.
BZG04-18TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- BZG04
- Packaging:
- Cut Tape (CT)
- 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)
BZG04-18TR FAQ
1.How can I place an order for BZG04-18TR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZG04-18TR 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 BZG04-18TR reliable?
The price and inventory of BZG04-18TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZG04-18TR is usually 5 days.
3.What payment methods are accepted for BZG04-18TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZG04-18TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZG04-18TR?
BZG04-18TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZG04-18TR 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 BZG04-18TR?
For technical support, including BZG04-18TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZG04-18TR requirements.
6.How does Aetrix verify that BZG04-18TR is sourced from the original manufacturer or authorized distributors?
All BZG04-18TR 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 BZG04-18TR meets industry standards.
7.What is the process for return or replacement of BZG04-18TR?
All BZG04-18TR units undergo pre-shipment inspection (PSI). If there is an issue with BZG04-18TR, 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 BZG04-18TR part is unused and in its original packaging.
Return procedure for BZG04-18TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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