My Inquiry
My Account
STMicroelectronics BZW04-28BRL
- Part No.:
- BZW04-28BRL
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
BZW04-28BRL.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO15
- Quantity:
- Payment:
- Shipping:
Inventory:3,671
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZW04-28BRL from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode in DO-15 package, designed for high-energy ESD and surge protection in DC power lines and signal interfaces. It features a 28 V stand-off voltage (VRM), 45.7 V clamping voltage (VCL) at 8.8 A peak pulse current (IPP), and 400 W peak pulse power rating (10/1000 µs), operating up to 175 °C junction temperature in industrial power supplies and telecom front-ends.
For engineers reviewing the BZW04-28BRL datasheet, BZW04-28BRL pinout, BZW04-28BRL application, or BZW04-28BRL equivalent, key selection criteria include clamping performance under IEC 61000-4-2 (30 kV contact discharge), thermal derating above 25 °C, unidirectional vs. bidirectional polarity configuration, and DO-15 mechanical compatibility with legacy PCB layouts.
Technical Context
This TVS diode uses planar silicon technology to achieve low leakage (<1 µA at VRM), stable breakdown behavior across -55 °C to +175 °C, and repeatable clamping response during 8/20 µs and 10/1000 µs transients. Its bidirectional structure enables symmetric protection on AC-coupled or floating lines without polarity constraints.
The device complies with IEC 61000-4-2 Level 4 (30 kV air/contact discharge), IEC 61000-4-4 Level 4 (4 kV), UL 497B, and JESD22-B102 E3 reliability standards. Thermal impedance is characterized for FR4 PCBs with 70 µm copper, supporting design-in for high-reliability industrial and telecom equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 28 V - Maximum continuous reverse working voltage before conduction begins; defines operating margin below clamping threshold. |
| Breakdown Voltage (VBR) | 28.2–31.4 V at 1 mA - Confirmed voltage range where avalanche conduction initiates; ensures predictable turn-on under overvoltage stress. |
| Clamping Voltage (VCL) | 45.7 V at 8.8 A (10/1000 µs) - Peak voltage seen by protected circuit during rated surge; determines maximum stress on downstream components. |
| Peak Pulse Power (PPP) | 400 W (10/1000 µs) - Sustained energy-handling capability at 25 °C ambient; derates to 230 W at 175 °C junction temperature. |
| Junction Temperature Range | -55 °C to +175 °C - Validated operational range for long-term reliability in harsh environments such as base station power rails or motor drive controls. |
| ESD Withstand (IEC 61000-4-2) | 30 kV air & contact discharge - Exceeds Level 4 immunity requirements; eliminates need for external ESD staging in interface protection. |
| Leakage Current (IRM) | ≤1 µA at VRM - Ensures minimal standby power loss and signal integrity in high-impedance sensing or battery-backed circuits. |
Pinout & Package
DO-15 (JEDEC DO-204AC) axial-leaded package with matte tin-plated leads. Cathode band marked on body; bidirectional version has no polarity marking and conducts symmetrically in both directions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (axial leads) | Surge current path terminals | For bidirectional operation: either lead serves as input or return; no fixed polarity required-enables placement flexibility on AC or floating nodes. |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature operation | Rated for continuous use up to 175 °C junction temperature-supports placement near heat-generating components like MOSFETs or transformers. |
| Low dynamic resistance (RD) | 1.24 Ω at 8/20 µs-minimizes voltage overshoot during fast transients and improves clamping precision under high di/dt conditions. |
| Planar junction construction | Enables tight parameter distribution and low leakage (<1 µA)-critical for precision analog front-ends and low-power IoT sensor nodes. |
| UL 497B certified | Recognized for telecom line protection per UL 497B QVGQ2.E136224-validates suitability for primary-side surge protection in PoE injectors and DSL modems. |
Applications
| Industrial Power Supply Input | Telecom Line Interface |
|---|---|
|
Use Scenario: Protection of 24 V DC input stage against lightning-induced surges and load dump events in PLC power modules. IC Role / Device Role / Timing Role: Primary-level TVS clamp absorbing >400 W transient energy before it reaches upstream rectifier and downstream DC-DC controller. Use Value: Maintains system uptime by preventing catastrophic failure of input capacitors and MOSFETs during repeated 10/1000 µs surges up to 400 W. |
Use Scenario: Surge protection on POTS or xDSL line interface cards exposed to induced surges from nearby power lines. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between tip/ring and ground, compliant with ITU-T K.20/K.21 immunity requirements. Use Value: Enables single-device protection without polarity-sensitive layout, reducing BOM count and board space versus dual-unidirectional solutions. |
| Automotive Body Control Module | IoT Sensor Node Power Rail |
|
Use Scenario: Protecting 12 V supply rail in BCMs against ISO 7637-2 pulse 1/2a/3a transients and ESD events during assembly/handling. IC Role / Device Role / Timing Role: Secondary-level TVS after LC filter, providing final-stage clamping with low leakage and high Tj tolerance. Use Value: Survives 175 °C underhood temperatures while maintaining <1 µA leakage-preserving battery life and avoiding false resets in always-on modules. |
Use Scenario: ESD hardening of 3.3 V or 5 V power input on battery-powered environmental sensors deployed in field installations. IC Role / Device Role / Timing Role: Standoff-rated TVS placed directly at connector entry point to shunt human-body-model (HBM) and IEC 61000-4-2 discharges. Use Value: Delivers 30 kV contact discharge immunity without degrading signal integrity or increasing quiescent current in ultra-low-power designs. |
Availability
BZW04-28BRL is available at Aetrix Electronics and suitable for industrial power supplies, telecom line interfaces, automotive body control modules, and IoT sensor node power rails requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for BZW04-28BRL 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, specializing in power management, analog, MEMS, and microcontroller technologies for industrial, automotive, and consumer applications.
The BZW04 series belongs to ST's high-reliability TVS portfolio, engineered specifically for robust surge immunity in harsh-environment power and interface protection-emphasizing thermal stability, low leakage, and compliance with international safety and EMC standards.
FAQ
What is the difference between BZW04-28 and BZW04-28B?
BZW04-28 is unidirectional and conducts only in reverse bias, requiring correct polarity orientation on the PCB; BZW04-28B is bidirectional, offering symmetrical clamping for AC or floating lines without polarity constraints. Both share identical VRM, VBR, and VCL ratings but differ in internal junction configuration and marking.
Can BZW04-28BRL be used in place of SMAJ28A?
Yes, BZW04-28BRL provides comparable 28 V stand-off and 45.7 V clamping at 8.8 A, but in DO-15 instead of SMA package. Its higher 175 °C Tj rating and lower leakage (<1 µA vs. ~5 µA) make it preferable in thermally constrained or low-power applications, though PCB footprint differs.
Does BZW04-28BRL meet IEC 61000-4-5 requirements?
No-BZW04-28BRL is rated for IEC 61000-4-2 (ESD) and IEC 61000-4-4 (EFT), not IEC 61000-4-5 (surge). Its 400 W (10/1000 µs) rating aligns with Level 4 EFT, but full 4 kV/2 Ω combination wave surge testing requires higher-energy devices like SM8S or 1.5KE series.
How does thermal derating affect BZW04-28BRL's power handling?
At 175 °C junction temperature, its peak pulse power drops from 400 W to 230 W (10/1000 µs), per Figure 3 in DS0660. This requires PCB copper area optimization (≥3 cm² per lead recommended) and thermal modeling to ensure safe operation in high-ambient environments like enclosed enclosures or near heat sources.
BZW04-28BRL 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):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 45.7V
- Current - Peak Pulse (10/1000µs):
- 8.8A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 255pF @ 1MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
BZW04-28BRL FAQ
1.How can I place an order for BZW04-28BRL through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-28BRL 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 BZW04-28BRL reliable?
The price and inventory of BZW04-28BRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-28BRL is usually 5 days.
3.What payment methods are accepted for BZW04-28BRL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-28BRL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-28BRL?
BZW04-28BRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-28BRL 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 BZW04-28BRL?
For technical support, including BZW04-28BRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-28BRL requirements.
6.How does Aetrix verify that BZW04-28BRL is sourced from the original manufacturer or authorized distributors?
All BZW04-28BRL 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 BZW04-28BRL meets industry standards.
7.What is the process for return or replacement of BZW04-28BRL?
All BZW04-28BRL units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-28BRL, 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 BZW04-28BRL part is unused and in its original packaging.
Return procedure for BZW04-28BRL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW04-28BRL Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
