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STMicroelectronics BZW04-7V8BRL
- Part No.:
- BZW04-7V8BRL
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
BZW04-7V8BRL.pdf
- Description:
- TVS DIODE 7.8VWM 11.3VC DO15
- Quantity:
- Payment:
- Shipping:
Inventory:6,510
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Product details
Overview
BZW04-7V8BRL from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode in DO-15 package, designed for IEC 61000-4-2 ESD protection (30 kV air/contact discharge) and IEC 61000-4-4 surge immunity (4 kV level 4). It features a stand-off voltage of 7.8 V, clamping voltage of 13.4 V at 38 A (10/1000 µs), and peak pulse power rating of 400 W. It operates up to 175 °C junction temperature and is used in DC power rail protection for industrial sensors and communication interfaces.
For engineers reviewing the BZW04-7V8BRL datasheet, BZW04-7V8BRL pinout, BZW04-7V8BRL application, or BZW04-7V8BRL equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD, leakage current at elevated Tj, dynamic resistance under fast transients, and compatibility with FR4 PCB thermal relief design per JEDEC DO-204AC mechanical outline.
Technical Context
This device uses planar silicon junction technology optimized for low leakage (<1 µA at 7.8 V, 25 °C) and stable clamping performance across -55 °C to +175 °C operating range. Its bidirectional structure enables symmetrical surge handling on AC-coupled or floating signal lines without polarity constraints.
The TVS responds to sub-nanosecond ESD events with <1 ns turn-on time and maintains clamping voltage within ±5% over 10/1000 µs surges up to 38 A. Dynamic resistance is 0.088 Ω at rated conditions, minimizing voltage overshoot during high-di/dt transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 7.8 V - Maximum continuous reverse working voltage before breakdown; sets minimum system operating margin. |
| Breakdown Voltage (VBR) | Min. 7.8 V, max. 8.67 V at 1 mA - Confirmed threshold where avalanche conduction begins; defines ESD trigger point. |
| Clamping Voltage (VCL) | 13.4 V at 38 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; must be below IC absolute maximum rating. |
| Peak Pulse Power (PPP) | 400 W (10/1000 µs) - Sustained energy dissipation capability at 25 °C ambient; derates to 230 W at 175 °C Tj. |
| Leakage Current (IR) | <1 µA at 7.8 V, 25 °C - Ensures negligible standby power loss and avoids false triggering in high-impedance sensing nodes. |
| Junction Capacitance (CJ) | 3500 pF at 0 V - Measured at 1 MHz; impacts high-frequency signal integrity on data lines; requires layout mitigation above ~1 MHz. |
| Operating Temperature | -55 °C to +175 °C - Enables deployment in under-hood automotive, industrial motor drives, and outdoor telecom equipment. |
Pinout & Package
DO-15 (JEDEC DO-204AC) axial-leaded package with matte tin-plated leads. Body length 6.05–6.75 mm, lead diameter 0.71–0.88 mm, overall length 26–31 mm. Compliant with J-STD-020 MSL Level 1 and UL 94 V0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side terminal (bidirectional) | Common reference node for symmetrical clamping; connects to GND or signal return path. |
| Cathode | High-side terminal (bidirectional) | Connects to protected line (e.g., RS-485 A/B, CAN H/L, sensor supply); forms bidirectional clamp path. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD robustness | 30 kV contact & air discharge - Exceeds industrial immunity requirement without external filtering. |
| IEC 61000-4-4 surge immunity | 4 kV level 4 (50 Ω source) - Protects against induced lightning surges on unshielded wiring. |
| High-temperature operation | 175 °C max Tj - Maintains clamping stability in engine control units and power converters with minimal derating. |
| Low dynamic resistance | 0.088 Ω at 38 A - Limits voltage overshoot during fast-rising transients, critical for 3.3 V/5 V logic protection. |
| ECOPACK compliance | Lead-free, RoHS-compliant matte tin plating - Meets global environmental regulations without solderability compromise. |
Applications
| Industrial Sensor Interface | RS-485 Communication Line |
|---|---|
|
Use Scenario: Protection of analog output (4–20 mA) and digital I/O pins in factory automation sensors exposed to cable-induced surges. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between signal line and ground, absorbing ESD and ringwave energy before reaching ADC or isolator input. Use Value: Prevents latch-up or permanent damage to precision op-amps and sigma-delta modulators operating at ≤10 µA bias currents. |
Use Scenario: Transient suppression on differential bus lines in programmable logic controllers (PLCs) with long field wiring runs. IC Role / Device Role / Timing Role: Common-mode surge shunt connected across A/B lines and referenced to local chassis ground. Use Value: Maintains signal integrity during 4 kV EFT bursts by limiting common-mode voltage excursion to <15 V, preserving receiver common-mode range. |
| Automotive Body Control Module | DC Power Rail Protection |
|
Use Scenario: ESD protection for LIN bus transceivers and switch inputs in door modules subjected to human-body-model discharges. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp mounted directly at connector entry point, before transceiver ESD diodes. Use Value: Reduces failure rate in production testing by absorbing >95% of 30 kV contact discharge energy before internal IC junctions. |
Use Scenario: Overvoltage clamping on 12 V battery-fed microcontroller supply rails in telematics units. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between VIN and GND, triggered only during load-dump or jump-start transients. Use Value: Clamps 13.4 V peak at 38 A, ensuring downstream LDOs and PMICs remain within safe operating area during ISO 7637-2 pulse 5a events. |
Availability
BZW04-7V8BRL is available at Aetrix Electronics and suitable for industrial sensor interface, RS-485 communication line, automotive body control module, and DC power rail protection requiring stable component supply across extended temperature ranges and high-reliability manufacturing.
Supply support for BZW04-7V8BRL 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensing solutions for industrial, automotive, and consumer markets.
The BZW04 series belongs to ST's high-power TVS diode product line, engineered specifically for robust electromagnetic immunity in harsh environments where sustained junction temperatures exceed 150 °C and ESD stress exceeds 30 kV.
FAQ
What is the difference between BZW04-7V8BRL and BZW04-7V8RL?
BZW04-7V8BRL is bidirectional, while BZW04-7V8RL is unidirectional. The 'B' suffix denotes symmetrical clamping behavior-critical for AC-coupled or floating signals like RS-485 or audio lines. Unidirectional versions require correct polarity installation and provide lower capacitance in DC applications.
Can BZW04-7V8BRL replace SMAJ7.8A in a DO-214AC footprint?
No-it uses DO-15 (axial) packaging, not DO-214AC (SMA). Physical mounting, thermal path, and PCB land pattern are incompatible. Equivalent DO-214AC bidirectional parts include SMBJ7.8CA or SMCJ7.8CA, which offer higher PPP but larger footprint and different thermal resistance.
How does junction temperature affect clamping voltage?
VCL increases linearly with Tj using temperature coefficient αT = 5.7 × 10−4/°C. At 150 °C, VCL rises to ~14.2 V (vs. 13.4 V at 25 °C), requiring margin verification against protected IC's absolute maximum ratings under worst-case thermal conditions.
Is BZW04-7V8BRL suitable for USB 2.0 data line protection?
No-its 3500 pF junction capacitance severely degrades signal integrity above ~1 MHz. USB 2.0 requires <5 pF devices (e.g., ESD5V3U2U). This TVS is intended for low-speed analog, power, or industrial serial buses where bandwidth is not constrained.
BZW04-7V8BRL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- BZW04, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 7.8V
- Voltage - Breakdown (Min):
- 9.5V
- Voltage - Clamping (Max) @ Ipp:
- 11.3V
- Current - Peak Pulse (10/1000µs):
- 16A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
BZW04-7V8BRL FAQ
1.How can I place an order for BZW04-7V8BRL through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-7V8BRL 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 BZW04-7V8BRL reliable?
The price and inventory of BZW04-7V8BRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-7V8BRL is usually 5 days.
3.What payment methods are accepted for BZW04-7V8BRL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-7V8BRL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-7V8BRL?
BZW04-7V8BRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-7V8BRL 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 BZW04-7V8BRL?
For technical support, including BZW04-7V8BRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-7V8BRL requirements.
6.How does Aetrix verify that BZW04-7V8BRL is sourced from the original manufacturer or authorized distributors?
All BZW04-7V8BRL 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 BZW04-7V8BRL meets industry standards.
7.What is the process for return or replacement of BZW04-7V8BRL?
All BZW04-7V8BRL units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-7V8BRL, 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 BZW04-7V8BRL part is unused and in its original packaging.
Return procedure for BZW04-7V8BRL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW04-7V8BRL Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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