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STMicroelectronics BZW04-48B
- Part No.:
- BZW04-48B
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
BZW04-48B.pdf
- Description:
- TVS DO15 47.8V 400W UNIDIR
- Quantity:
- Payment:
- Shipping:
Inventory:5,929
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Product details
Overview
BZW04-48B 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 48 V, clamping voltage (VCL) of 77.0 V at 5.2 A (10/1000 µs), peak pulse power of 400 W, and operates up to 175 °C junction temperature - deployed in industrial power supplies and telecom interface circuits.
For engineers reviewing the BZW04-48B datasheet, BZW04-48B pinout, BZW04-48B application, or BZW04-48B equivalent, key selection criteria include clamping performance at 5.2 A surge current, bidirectional polarity, DO-15 mechanical compatibility, IEC 61000-4-2 ±30 kV contact/air discharge compliance, and thermal derating above 25 °C ambient.
Technical Context
The BZW04-48B uses planar silicon junction technology optimized for low leakage (<1 µA at VRM) and stable dynamic resistance (RD = 3.50 Ω at 10/1000 µs), enabling reliable clamping under repetitive transients. Its bidirectional structure provides symmetrical protection without polarity dependency across AC-coupled or floating lines.
It meets IEC 61000-4-4 level 4 (4 kV fast transient burst) and exceeds IEC 61000-4-2 level 4 for ESD immunity (±30 kV). Junction temperature range spans –55 °C to +175 °C, with thermal impedance (Zth(j-a)) dropping from 1000 °C/W (single pulse, 0.01 s) to 100 °C/W (1 s pulse) on FR4 PCB with standard copper layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 48 V - maximum continuous reverse operating voltage before clamping onset; defines minimum system rail margin for safe operation. |
| Breakdown Voltage (VBR) | 47.8–53.2 V at 1 mA - tight tolerance ensures predictable turn-on threshold across temperature and production lot. |
| Clamping Voltage (VCL) | 77.0 V at 5.2 A (10/1000 µs) - limits transient voltage seen by downstream ICs; critical for protecting 60 V-rated MOSFETs or controllers. |
| Peak Pulse Power (PPP) | 400 W (10/1000 µs) - sustains single-event surges up to 5.2 A without failure; derates to 230 W at Tj = 175 °C. |
| Junction Temperature Range | –55 °C to +175 °C - supports operation in harsh environments including industrial motor drives and outdoor telecom cabinets. |
| ESD Withstand | ±30 kV air/contact discharge (IEC 61000-4-2) - exceeds automotive and industrial immunity requirements without external filtering. |
| Dynamic Resistance (RD) | 3.50 Ω - determines voltage overshoot during fast-rising transients; lower RD improves clamping fidelity for sub-100 ns edges. |
Pinout & Package
DO-15 (JEDEC DO-204AC) package: axial leaded, epoxy-molded, matte tin-plated leads. Dimensions: A = 6.05–6.75 mm (body length), B = 26.0–31.0 mm (lead spacing), C = 2.95–3.53 mm (body diameter), D = 0.71–0.88 mm (lead diameter).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Transient current entry (bidirectional) | Carries surge current during either polarity event; symmetric with cathode due to bidirectional construction. |
| Cathode (Lead 2) | Transient current exit (bidirectional) | Completes conduction path during both positive and negative transients; no polarity marking required on device body. |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature reliability | Rated for continuous operation at Tj = 175 °C with validated derating curves - enables use in enclosed, unventilated power modules. |
| Low leakage current | <1 µA at VRM = 48 V (25 °C) - minimizes standby power loss in battery-backed or energy-sensitive systems. |
| Fast response time | <1 ns turn-on - clamps transients before sensitive logic or analog circuitry responds, preventing latch-up or damage. |
| Robust surge capability | Withstands 2.3 kW (8/20 µs) pulses - handles lightning-induced surges in AC input stages and PoE-powered equipment. |
| UL 497B certified | File QVGQ2.E136224 - validates suitability for primary-side telecom and industrial surge protection per UL safety standards. |
Applications
| Industrial Power Supply Input Protection | Telecom Line Interface Protection |
|---|---|
Use Scenario: 48 V DC input stage of programmable logic controller (PLC) power module exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Primary overvoltage clamp on bulk input rail, placed upstream of DC-DC converter and EMI filter. Use Value: Limits transient voltage to ≤77 V during 5.2 A surges, preserving 60 V-rated input MOSFETs and reducing need for oversized input capacitors. |
Use Scenario: Protection of RS-485 transceiver data lines in outdoor base station equipment subject to induced lightning surges. IC Role / Device Role / Timing Role: Bidirectional shunt protector on differential pair, mounted adjacent to connector. Use Value: Symmetric clamping ensures equal protection for both polarities of common-mode surges, maintaining signal integrity without polarity biasing. |
| Automotive Body Control Module (BCM) Power Rail | Smart Meter AC Mains Surge Suppression |
Use Scenario: 12 V–48 V dual-voltage BCM supply line subjected to ISO 7637-2 pulse 1/2a/5a transients. IC Role / Device Role / Timing Role: Secondary-level TVS after LC filter, targeting residual spikes escaping front-end suppression. Use Value: Delivers 400 W clamping at 10/1000 µs while maintaining <1 µA leakage - avoids battery drain in always-on vehicle subsystems. |
Use Scenario: Protection of metering IC power supply against surges coupled from 230 V AC mains via transformer or optocoupler isolation. IC Role / Device Role / Timing Role: Isolation barrier-side clamp on secondary-side 5 V or 3.3 V rail. Use Value: UL 497B certification and ±30 kV ESD rating ensure compliance with IEC 62053-21 and EN 55032 emission/safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48CA | DO-214AA package; 600 W (10/1000 µs); VCL = 77.4 V at 7.7 A; higher IPP but larger footprint. | Preferred where board space allows surface-mount and higher surge margin is needed (e.g., DIN rail power supplies). | Select SMBJ48CA when reflow assembly is mandatory and thermal mass from PCB copper can support higher PPP. |
| P6KE48CA | DO-15 package; 600 W (10/1000 µs); VCL = 77.0 V at 7.7 A; older generation with higher RD (4.5 Ω) and wider VBR tolerance. | Suitable for cost-sensitive legacy designs where 400 W rating is insufficient but DO-15 form factor is retained. | Choose P6KE48CA only if existing footprint and bill-of-material reuse outweigh need for tighter clamping and lower leakage. |
Compared with SMBJ48CA and P6KE48CA, BZW04-48B delivers superior thermal stability at 175 °C, lower leakage (<1 µA vs ≥5 µA), and tighter VBR tolerance (±5.5% vs ±10%), making it optimal for high-reliability, thermally constrained, or low-power-harvesting applications.
Availability
BZW04-48B is available at Aetrix Electronics and suitable for industrial power supply input protection, telecom line interface protection, automotive body control modules, and smart meter AC mains surge suppression requiring stable component supply and long-term lifecycle support.
Supply support for BZW04-48B 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 microcontrollers, power devices, sensors, and protection components for industrial, automotive, and consumer markets.
BZW04-48B belongs to ST's high-reliability TVS diode portfolio, engineered specifically for robust transient suppression in harsh-environment power conversion and communication interfaces where thermal resilience and ESD immunity are non-negotiable.
FAQ
What is the maximum clamping voltage of BZW04-48B under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 77.0 V at 5.2 A for a 10/1000 µs waveform, measured at Tamb = 25 °C. This value increases linearly with junction temperature using αT = 10.3 × 10⁻⁴ /°C, reaching ~85.5 V at Tj = 125 °C per the datasheet's VCL vs. Tj formula.
Is BZW04-48B suitable for bidirectional AC signal line protection?
Yes - BZW04-48B is explicitly a bidirectional TVS diode, with symmetrical breakdown and clamping characteristics for both polarities. Its DO-15 axial package and lack of polarity marking make it ideal for protecting AC-coupled or floating differential lines such as RS-485, CAN, or audio interfaces.
How does BZW04-48B perform at elevated junction temperatures?
At Tj = 175 °C, its peak pulse power rating drops to 230 W (10/1000 µs), and leakage remains below 100 nA per Figure 9. The device maintains full functionality across its rated junction range, with VBR and VCL shifting predictably using the provided αT coefficient (10.3 × 10⁻⁴ /°C).
Can BZW04-48B replace P6KE48CA in an existing DO-15 footprint?
Yes - BZW04-48B shares identical DO-15 mechanical dimensions and lead spacing with P6KE48CA, enabling direct drop-in replacement. However, BZW04-48B offers tighter VBR tolerance (±5.5% vs ±10%), lower leakage (<1 µA vs ≥5 µA), and improved thermal stability, delivering measurable reliability gains in thermally demanding applications.
BZW04-48B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- BZW04, TRANSIL™
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 47.8V
- Voltage - Breakdown (Min):
- 53.2V
- Voltage - Clamping (Max) @ Ipp:
- 77V
- Current - Peak Pulse (10/1000µs):
- 5.2A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 160pF @ 1MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
BZW04-48B FAQ
1.How can I place an order for BZW04-48B through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-48B 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 BZW04-48B reliable?
The price and inventory of BZW04-48B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-48B is usually 5 days.
3.What payment methods are accepted for BZW04-48B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-48B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-48B?
BZW04-48B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-48B 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 BZW04-48B?
For technical support, including BZW04-48B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-48B requirements.
6.How does Aetrix verify that BZW04-48B is sourced from the original manufacturer or authorized distributors?
All BZW04-48B 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 BZW04-48B meets industry standards.
7.What is the process for return or replacement of BZW04-48B?
All BZW04-48B units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-48B, 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 BZW04-48B part is unused and in its original packaging.
Return procedure for BZW04-48B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW04-48B Tags
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