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STMicroelectronics BZW04-48RL
- Part No.:
- BZW04-48RL
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
BZW04-48RL.pdf
- Description:
- TVS DIODE 47.8VWM 77VC DO15
- Quantity:
- Payment:
- Shipping:
Inventory:6,551
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Product details
Overview
BZW04-48RL from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode in DO-15 package, designed to clamp ESD and surge transients up to 400 W (10/1000 µs) with a standoff voltage of 47.8 V (min) and clamping voltage of 77.0 V at 5.2 A. It operates from −55 °C to +175 °C and meets IEC 61000-4-2 (30 kV air/contact discharge) and IEC 61000-4-4 level 4 (4 kV) standards for industrial power supply protection.
For engineers reviewing the BZW04-48RL datasheet, BZW04-48RL pinout, BZW04-48RL application, or BZW04-48RL equivalent, key selection criteria include its 47.8 V breakdown voltage, 77.0 V clamping at 5.2 A, 1 µA max leakage at VRM, 3.50 Ω dynamic resistance, and DO-15 mechanical compatibility with high-reliability SMPS and telecom front-end circuits.
Technical Context
This TVS diode uses planar junction technology to achieve low leakage (<1 µA at VRM), stable high-temperature operation (Tj up to +175 °C), and repeatable clamping performance across surge waveforms (10/1000 µs and 8/20 µs). Its unidirectional configuration enables asymmetric overvoltage protection on DC rails where reverse polarity is not expected.
The device's thermal design supports sustained reliability under repeated surges: peak pulse power drops predictably with junction temperature (e.g., 230 W at Tj = 175 °C for 10/1000 µs), and its DO-15 package provides defined thermal impedance (Zth(j-a) ≈ 100 °C/W for single pulse on FR4) for PCB-level thermal management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 47.8 V min - ensures reliable blocking during normal 48 V DC operation without leakage-induced stress |
| Breakdown Voltage (VBR) | 47.8–53.2 V at 1 mA - defines precise conduction onset for predictable surge clamping threshold |
| Clamping Voltage (VCL) | 77.0 V at 5.2 A (10/1000 µs) - limits downstream IC voltage stress to safe levels during surge events |
| Peak Pulse Power | 400 W (10/1000 µs), 100 W (8/20 µs) - determines maximum energy absorption capability per waveform standard |
| Leakage Current (IRM) | ≤1 µA at VRM - minimizes standby power loss and avoids false triggering in low-power systems |
| Dynamic Resistance (RD) | 3.50 Ω - governs VCL rise slope under increasing surge current, critical for voltage margining |
| Junction Temperature Range | −55 °C to +175 °C - enables deployment in automotive engine bays and industrial power converters |
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 = 26–31 mm (lead spacing), C = 2.95–3.53 mm (diameter), D = 0.71–0.88 mm (lead diameter).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (cathode-banded end) | DC input reference node | Connected to ground or low-side return path; defines unidirectional conduction direction |
| Cathode (banded end) | Protected line connection | Connected to 48 V rail; conducts surge current to ground when V > VBR |
Key Features
| Feature | Design Value |
|---|---|
| High-Temperature Operation | Rated for continuous operation up to +175 °C junction temperature-enables use in thermally constrained power supplies |
| Low-Leakage Planar Junction | ≤1 µA IRM at VRM-reduces standby power loss and prevents false triggering in battery-backed systems |
| IEC 61000-4-2 Compliance | 30 kV air/contact discharge-meets industrial and telecom ESD immunity requirements without external filtering |
| Controlled Clamping Slope | 3.50 Ω RD-ensures predictable VCL increase vs. IPP, simplifying downstream voltage margin analysis |
| Reflow-Compatible Lead Finish | Matte tin plating-supports Pb-free reflow soldering per J-STD-020 MSL level 1 with 260 °C max lead temperature |
Applications
| Industrial SMPS Input Protection | Telecom 48 V DC Distribution |
|---|---|
Use Scenario: Protecting AC/DC converter primary-side rectifier outputs and secondary-side 48 V distribution buses against lightning-induced surges and load dump transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between 48 V rail and chassis ground to clamp positive-going transients above 53.2 V. Use Value: Limits transient voltage to ≤77.0 V at 5.2 A, preventing damage to downstream DC-DC controllers and PMICs rated for 60 V absolute maximum. | Use Scenario: Safeguarding Ethernet-powered (PoE) midspan injectors and PSE controllers against cable discharge events and induced surges on 48 V data lines. IC Role / Device Role / Timing Role: Standoff protector on powered pair inputs, conducting only during overvoltage events exceeding 47.8 V. Use Value: With 1 µA leakage at 48 V, it avoids degrading PoE detection accuracy while clamping 4 kV IEC 61000-4-4 bursts to safe levels. |
| Automotive Body Control Module (BCM) | Server PSU Front-End Protection |
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins connected to 48 V auxiliary power domains in 48 V mild-hybrid vehicles. IC Role / Device Role / Timing Role: Localized TVS on 48 V supply rail feeding BCM logic, placed adjacent to LDO input capacitors. Use Value: Operates reliably at +175 °C ambient, surviving under-hood thermal cycling while maintaining <77 V clamping during load dump pulses. | Use Scenario: Guarding redundant 48 V backplane inputs in enterprise server PSUs against hot-swap transients and cross-coupled noise from adjacent modules. IC Role / Device Role / Timing Role: Primary surge limiter on 48 V input before bulk capacitance and active OR-ing FETs. Use Value: 400 W peak pulse rating handles multiple sequential hot-plug events without degradation; DO-15 axial form factor allows vertical mounting for optimal creepage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48A | DO-214AA package; 48 V VBR; 79.5 V VCL @ 5.0 A; 600 W (10/1000 µs) | Higher power rating but larger footprint; lower thermal resistance due to surface-mount pad area | Select when board space permits larger SMD package and higher surge margin is required |
| P6KE48A | DO-15 package; 48 V VBR; 77.0 V VCL @ 5.2 A; 600 W (10/1000 µs); higher leakage (5 µA) | Same axial form factor but wider tolerance (±10% VBR) and elevated leakage affects low-power monitoring circuits | Select only for cost-sensitive legacy designs where 5 µA leakage is acceptable |
Compared with SMBJ48A and P6KE48A, BZW04-48RL offers tighter VBR tolerance (±5.5%), lower leakage (1 µA), and optimized thermal performance in DO-15 for high-reliability 48 V systems-making it preferable where precision clamping and long-term stability are critical.
Availability
BZW04-48RL is available at Aetrix Electronics and suitable for industrial SMPS input protection, telecom 48 V DC distribution, and automotive body control modules requiring stable component supply and full traceability.
Supply support for BZW04-48RL 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, digital, and mixed-signal ICs for automotive, industrial, and power applications.
The BZW04 series belongs to ST's high-reliability TVS portfolio, engineered specifically for robust surge immunity in demanding 48 V power architectures-including telecom infrastructure, server PSUs, and next-generation vehicle electrical systems.
FAQ
What is the maximum surge current the BZW04-48RL can handle?
The BZW04-48RL sustains 5.2 A peak pulse current (IPP) under 10/1000 µs waveform at 77.0 V clamping voltage. For 8/20 µs transients, it handles up to 23 A (calculated from 100 W peak power and VCL), verified per IEC 61000-4-5 test conditions in the DS0660 datasheet.
Is BZW04-48RL suitable for bidirectional signal line protection?
No-BZW04-48RL is unidirectional and intended only for DC rail protection. For bidirectional applications like RS-485 or USB data lines, ST offers the BZW04-48B variant, which features symmetrical clamping in both polarities and identical VBR/VCL specs.
How does junction temperature affect clamping voltage?
VCL increases linearly with junction temperature: VCL(Tj) = VCL(25 °C) × [1 + αT × (Tj − 25)], where αT = 10.3 × 10⁻⁴ /°C. At 175 °C, VCL rises by ~15%, reaching ~88.6 V at 5.2 A-critical for margining in high-ambient environments.
Can BZW04-48RL be used in lead-free reflow processes?
Yes-its matte tin-plated leads comply with J-STD-020 MSL level 1 and support peak reflow temperatures up to 245 °C for ≤30 seconds. The recommended profile (Figure 20, DS0660 Rev 4) specifies ramp rates ≤3 °C/s and dwell time within 217–245 °C for 60–90 seconds.
BZW04-48RL 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:
- 1
- Bidirectional Channels:
- -
- 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:
- 320pF @ 1MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
BZW04-48RL FAQ
1.How can I place an order for BZW04-48RL through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-48RL 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 BZW04-48RL reliable?
The price and inventory of BZW04-48RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-48RL is usually 5 days.
3.What payment methods are accepted for BZW04-48RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-48RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-48RL?
BZW04-48RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-48RL 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 BZW04-48RL?
For technical support, including BZW04-48RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-48RL requirements.
6.How does Aetrix verify that BZW04-48RL is sourced from the original manufacturer or authorized distributors?
All BZW04-48RL 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 BZW04-48RL meets industry standards.
7.What is the process for return or replacement of BZW04-48RL?
All BZW04-48RL units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-48RL, 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 BZW04-48RL part is unused and in its original packaging.
Return procedure for BZW04-48RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW04-48RL Tags
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Diodes Incorporated
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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