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Taiwan Semiconductor Corporation BZW04-23B
- Part No.:
- BZW04-23B
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-23B.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:3,924
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Product details
Overview
BZW04-23B from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode in DO-15 package, designed for high-energy ESD and surge protection in power rails and signal lines. It features a standoff voltage (VRM) of 23 V, minimum breakdown voltage (VBR) of 25.6 V at 1 mA, clamping voltage (VCL) of 37.5 V at 10.8 A (10/1000 µs), peak pulse power of 400 W, and operating junction temperature up to +175 °C - deployed in industrial power supplies and telecom interface circuits.
For engineers reviewing the BZW04-23B datasheet, BZW04-23B pinout, BZW04-23B application, or BZW04-23B equivalent, key selection criteria include clamping performance under IEC 61000-4-2 (30 kV air/contact discharge), thermal derating above 25 °C, unidirectional vs. bidirectional polarity configuration, and DO-15 mechanical compatibility with FR4 PCB layouts.
Technical Context
The BZW04-23B implements planar-junction silicon avalanche technology optimized for low leakage (<1 µA at VRM = 23 V) and stable VBR temperature coefficient (αT = 5.7 × 10⁻⁴ /°C). Its bidirectional structure enables symmetrical clamping on AC-coupled lines without polarity constraints.
It delivers 400 W peak pulse power at Tj = 25 °C (10/1000 µs), derating to 230 W at Tj = 175 °C per Figure 3, and supports 8/20 µs surges up to 2.3 kW. Dynamic resistance (RD) is 0.047 Ω at 10/1000 µs, enabling fast response to transients while minimizing voltage overshoot during high-current events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 23 V - maximum continuous reverse working voltage before leakage exceeds 1 µA; defines safe operating margin below breakdown. |
| Breakdown Voltage (VBR) | 25.6 V min at 1 mA - guaranteed conduction onset; enables precise overvoltage threshold setting in protection circuits. |
| Clamping Voltage (VCL) | 37.5 V at 10.8 A (10/1000 µs) - limits transient voltage seen by downstream ICs; critical for safeguarding 24 V logic or analog interfaces. |
| Peak Pulse Power (PPP) | 400 W (10/1000 µs) - sustains energy-limited surges common in industrial I/O; derates linearly to 230 W at 175 °C junction temp. |
| Junction Temperature Range | –55 °C to +175 °C - supports operation in harsh environments including motor drives and outdoor telecom enclosures. |
| ESD Robustness | 30 kV contact & air discharge (IEC 61000-4-2 Level 4) - exceeds automotive and industrial immunity requirements without external filtering. |
| Dynamic Resistance (RD) | 0.047 Ω - ensures minimal voltage rise above VCL during surge current, preserving protected circuit timing margins. |
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. Bidirectional symmetry means no anode/cathode distinction - both terminals function identically under reverse or forward transient stress.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Transient current entry (bidirectional) | Accepts surge current in either polarity; connects directly to protected line (e.g., RS-485 A/B or 24 V rail). |
| Cathode (Lead 2) | Transient current exit (bidirectional) | Completes low-impedance path to ground or return rail; requires low-inductance PCB trace routing for optimal clamping. |
Key Features
| Feature | Design Value |
|---|---|
| High-Temperature Operation | Rated for continuous operation up to +175 °C junction temperature - eliminates thermal derating concerns in sealed power converters. |
| Low Leakage Current | <1 µA at VRM = 23 V and 25 °C - prevents standby power loss and false triggering in battery-backed systems. |
| Fast Clamping Response | Sub-nanosecond avalanche turn-on - suppresses transients before sensitive ICs experience latch-up or gate oxide damage. |
| IEC 61000-4-4 Compliance | Withstands 4 kV burst (level 4) - protects against switching noise from relays, solenoids, and inductive loads in factory automation. |
| Robust Mechanical Construction | UL94 V0 epoxy molding and JESD22-B102 E3 solderability - ensures long-term reliability in reflow and wave-soldered assemblies. |
Applications
| Industrial PLC I/O Protection | 24 V DC Power Rail Protection |
|---|---|
Use Scenario: Protecting digital input modules from field-wiring induced surges and ESD during maintenance. IC Role / Device Role / Timing Role: Primary shunt clamp on isolated 24 V input lines, placed upstream of optocoupler or level-shifter. Use Value: Limits transient voltage to ≤37.5 V, preventing damage to microcontroller GPIOs rated for 3.3 V or 5 V logic levels. |
Use Scenario: Safeguarding 24 V supply inputs in motor drive controllers exposed to back-EMF and load dump. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor input, clamping fast-rising spikes before DC-DC converter stage. Use Value: Absorbs 400 W surges without degradation, maintaining system uptime where replacement downtime exceeds $2,000/hour. |
| Telecom Line Interface Protection | RS-485 Transceiver Protection |
Use Scenario: Shielding Ethernet PoE injectors from lightning-induced surges on outdoor cable runs. IC Role / Device Role / Timing Role: Bidirectional clamp between data pair and ground, integrated into common-mode choke output stage. Use Value: Symmetric clamping preserves differential signal integrity while diverting >10 A transients away from PHY ICs. |
Use Scenario: Securing half-duplex RS-485 nodes in factory floor networks subject to ground potential differences. IC Role / Device Role / Timing Role: Per-line TVS on A and B bus lines, mounted adjacent to transceiver pins with shortest possible traces. Use Value: 30 kV ESD rating prevents communication lockups during operator handling; <1 nF junction capacitance avoids signal edge distortion at 10 Mbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA | DO-214AA package; 24 V VRM; 38.9 V VCL @ 10.3 A; 600 W PPP (10/1000 µs); higher capacitance (~150 pF) | Better suited for surface-mount designs with space constraints; less ideal for high-frequency RS-485 due to higher CJ | Select when board real estate is limited and thermal management allows SMT mounting; verify layout clearance for SMB footprint. |
| P6KE27CA | DO-15 package; 27 V VRM; 43.5 V VCL @ 9.2 A; 600 W PPP; lower temperature coefficient (αT = 0.05 %/°C) | Higher clamping voltage reduces protection margin for 24 V systems; better for 28–30 V nominal rails | Choose only if system nominal voltage is ≥27 V and tighter VCL tolerance is not required; avoid for 24 V logic interfaces. |
Compared with SMBJ24CA and P6KE27CA, the BZW04-23B offers superior thermal stability at elevated temperatures (175 °C max Tj), lower dynamic resistance (0.047 Ω), and tighter VBR tolerance - making it preferred for mission-critical 24 V industrial control where long-term reliability outweighs minor PPP advantage.
Availability
BZW04-23B is available at Aetrix Electronics and suitable for industrial PLC I/O protection, 24 V DC power rail protection, and RS-485 transceiver protection requiring stable component supply across multi-year production cycles.
Supply support for BZW04-23B 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 microcontrollers for industrial, automotive, and consumer markets.
The BZW04 series belongs to ST's high-reliability TVS diode portfolio, engineered specifically for robust surge immunity in harsh industrial environments where extended temperature operation and long-term parametric stability are mandatory.
FAQ
What is the maximum clamping voltage of BZW04-23B under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 37.5 V at 10.8 A for a 10/1000 µs waveform, measured at Tj = 25 °C. This value increases with junction temperature at a rate defined by αT = 5.7 × 10⁻⁴ /°C, reaching ~41.2 V at 125 °C per the VCL vs. Tj formula in DS0660.
Can BZW04-23B be used in place of a unidirectional TVS like BZW04-23?
Yes, but only in AC-coupled or floating circuits where polarity reversal is possible. The BZW04-23B provides symmetrical clamping, whereas BZW04-23 clamps only in reverse bias. Substituting bidirectional for unidirectional in DC-biased rails may cause unintended conduction during normal operation.
Does BZW04-23B meet UL 497B certification for telecom surge protection?
Yes - BZW04-23B carries UL 497B file number QVGQ2.E136224, confirming compliance for primary and secondary circuit protection in telecommunications equipment, including isolation barrier applications per UL 60950-1 and UL 62368-1.
What is the recommended PCB pad layout for optimal thermal performance?
ST recommends ≥2.5 cm² of 70 µm copper per lead (per Figure 12), with thermal vias connecting to internal ground planes. Minimum pad width is 2.0 mm, and trace length from device to ground plane must be ≤5 mm to limit inductance and preserve clamping speed under 8/20 µs surges.
BZW04-23B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-204AL, DO-41, Axial
- Series:
- BZW04
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 23.1V
- Voltage - Breakdown (Min):
- 25.7V
- Voltage - Clamping (Max) @ Ipp:
- 37.5V
- Current - Peak Pulse (10/1000µs):
- 10.7A
- 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)
BZW04-23B FAQ
1.How can I place an order for BZW04-23B through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-23B 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 BZW04-23B reliable?
The price and inventory of BZW04-23B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-23B is usually 5 days.
3.What payment methods are accepted for BZW04-23B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-23B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-23B?
BZW04-23B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-23B 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 BZW04-23B?
For technical support, including BZW04-23B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-23B requirements.
6.How does Aetrix verify that BZW04-23B is sourced from the original manufacturer or authorized distributors?
All BZW04-23B 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 BZW04-23B meets industry standards.
7.What is the process for return or replacement of BZW04-23B?
All BZW04-23B units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-23B, 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 BZW04-23B part is unused and in its original packaging.
Return procedure for BZW04-23B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW04-23B Tags
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