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Taiwan Semiconductor Corporation BZW04-48B
- Part No.:
- BZW04-48B
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-48B.pdf
- Description:
- TVS DIODE 47.8VWM 77VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:5,904
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Product details
Overview
BZW04-48B from Taiwan Semiconductor is a bidirectional transient voltage suppressor diode (TVS) designed for high-energy surge clamping in automotive and industrial power rails. It features a 47.8 V working stand-off voltage, 53.2–58.8 V breakdown voltage at 1 mA, 77.0 V maximum clamping voltage at 5.2 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - deployed to protect CAN transceivers, microcontroller I/O, and DC-DC converter inputs.
For engineers reviewing the BZW04-48B datasheet, BZW04-48B pinout, BZW04-48B application, or BZW04-48B equivalent, key selection criteria include unidirectional/bidirectional polarity configuration, DO-41 package thermal derating above 25°C, junction-to-lead thermal resistance of 60°C/W, and compliance with AEC-Q101 for automotive-grade reliability validation.
Technical Context
The BZW04-48B operates as a silicon avalanche diode with symmetrical bidirectional clamping behavior, enabling protection against both positive and negative transients without external polarity management. Its low dynamic impedance ensures stable clamping during 10/1000 µs surges up to 5.2 A, while its <1 µA reverse leakage at 47.8 V supports low-power standby integrity.
Thermally, it sustains operation from –55°C to +175°C junction temperature, with steady-state power dissipation rated at 1 W under 75°C lead temperature conditions. The device's 0.103%/°C breakdown voltage temperature coefficient enables predictable voltage drift across automotive thermal cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 47.8 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC bias margin for protected circuitry. |
| VBR (min/max) | 53.2 V / 58.8 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering within specified tolerance band. |
| VC @ IPP | 77.0 V at 5.2 A - Clamped voltage during full-rated 400 W surge; determines worst-case overvoltage seen by downstream ICs. |
| PPK | 400 W - Peak pulse power handling per 10/1000 µs waveform; validates immunity to ISO 7637-2 Pulse 1/2/5a transients. |
| TJ max | +175°C - Maximum junction temperature; supports under-hood deployment with minimal heatsinking. |
| RθJL | 60°C/W - Junction-to-lead thermal resistance; enables accurate PCB copper pad sizing for thermal management. |
Pinout & Package
Package: DO-204AL (DO-41), axial-leaded, glass-passivated silicon junction. Cathode band marking applies only to unidirectional variants; BZW04-48B is bidirectional and lacks polarity marking - terminals are functionally interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both leads serve identical clamping roles; no directional installation required - simplifies layout and assembly. |
| Leads (Tin-plated) | Thermal and electrical interface | Compliant with J-STD-002 solderability; 0.300 g mass impacts thermal time constant during surge events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified option available | Validated for automotive powertrain and body electronics per stress test requirements - not inherent to standard BZW04-48B unless ordered with "H" suffix. |
| 400 W surge capability (10/1000 µs) | Meets ISO 7637-2 Level IV and IEC 61000-4-5 Line Surge Class 3 requirements without external series impedance. |
| Clamping voltage ≤77.0 V at 5.2 A | Ensures protected 48 V systems (e.g., commercial vehicle ECUs) remain below 80 V absolute maximum during worst-case transients. |
| Reverse leakage <1 µA @ 47.8 V | Minimizes quiescent current drain in always-on circuits such as battery-monitoring or CAN wake-up receivers. |
| DO-41 package with UL 94V-0 molding | Enables manual or automated through-hole assembly; flammability rating satisfies IPC-CC-830B coating requirements. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppressing load-dump and jump-start transients on 48 V board-net power supplies in commercial vehicles. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed upstream of DC-DC converters and PMICs. Use Value: Limits transient overvoltage to ≤77.0 V, preventing latch-up or gate oxide damage in 65 nm and finer process ICs. |
Use Scenario: Shielding analog front-ends of pressure/temperature sensors connected to long harnesses in factory automation. IC Role / Device Role / Timing Role: Fast-response surge shunt located at connector entry point, before signal conditioning op-amps. Use Value: Sub-1 ns response time clamps EFT bursts (IEC 61000-4-4) before they propagate into precision ADC reference paths. |
| LED Driver Input Stage Protection | RS-485 Transceiver Bus Line Protection |
Use Scenario: Safeguarding constant-current LED drivers in outdoor lighting against lightning-induced surges on AC/DC input lines. IC Role / Device Role / Timing Role: Primary overvoltage clamp on bulk capacitor input node, coordinated with MOV and fuse. Use Value: 400 W rating handles repetitive 10/1000 µs surges without degradation - critical for IP66-rated luminaires with limited heat dissipation. |
Use Scenario: Protecting RS-485 transceivers (e.g., THVD1550) on industrial fieldbus networks exposed to ground potential differences. IC Role / Device Role / Timing Role: Bidirectional clamping device on A/B differential pair, referenced to local ground. Use Value: Symmetrical clamping maintains common-mode voltage integrity during ±15 kV ESD contact discharge (IEC 61000-4-2). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48CA (Bourns) | DO-214AA package (SMB), 48 V VWM, 70 V VC @ 5.7 A; 600 W PPK rating. | Higher surge rating but larger footprint; requires PCB re-layout due to surface-mount form factor. | Select when higher surge margin is needed and SMT assembly is already established. |
| P6KE48CA (ON Semiconductor) | DO-15 package, 48 V VWM, 77 V VC @ 5.2 A; 600 W PPK; wider VBR tolerance (42.8–53.2 V). | Looser breakdown spec affects clamping consistency; lower thermal resistance (RθJA = 65°C/W vs. 100°C/W) improves ambient performance. | Prefer where cost sensitivity outweighs tight VBR control and legacy through-hole compatibility is retained. |
Compared with SMBJ48CA and P6KE48CA, the BZW04-48B offers tighter VBR tolerance (53.2–58.8 V), DO-41 compatibility with existing through-hole tooling, and verified 175°C TJ max - making it optimal for space-constrained automotive modules requiring proven thermal robustness without SMT conversion.
Availability
BZW04-48B is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface protection, and 48 V LED driver input staging requiring stable component supply and long-term obsolescence management.
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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and power MOSFETs for industrial and automotive markets.
The BZW04 Series was engineered specifically for high-reliability transient suppression in harsh-environment applications - emphasizing tight VBR control, AEC-Q101 qualification pathways, and DO-41 mechanical robustness for vibration-prone installations.
FAQ
What is the polarity configuration of BZW04-48B?
The BZW04-48B is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive- and negative-going transients without requiring orientation during placement. Unlike unidirectional variants (e.g., BZW04-48), it has no cathode band marking and functions identically regardless of lead assignment - essential for differential line protection like RS-485 or AC-coupled interfaces.
Does BZW04-48B meet AEC-Q101 qualification?
The standard BZW04-48B is not AEC-Q101 qualified; however, the AEC-Q101 variant is available as BZW04-48BH (with "H" suffix). This version undergoes full stress testing per AEC-Q101 Rev D, including HTGB, TCT, and ESD, and is intended for automotive powertrain and chassis applications where zero-failure reliability is mandated.
What is the maximum clamping voltage of BZW04-48B under surge conditions?
The BZW04-48B exhibits a maximum clamping voltage (VC) of 77.0 V when subjected to its rated peak pulse current of 5.2 A (10/1000 µs waveform). This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during worst-case transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
How does the thermal performance of BZW04-48B affect PCB layout?
The BZW04-48B has a junction-to-lead thermal resistance (RθJL) of 60°C/W and junction-to-ambient (RθJA) of 100°C/W on standard FR-4 with 10 mm leads. To maintain TJ ≤175°C under repeated 400 W surges, designers must use ≥5 × 5 mm copper pads per lead and avoid excessive trace length - especially in high-temperature environments like engine compartments.
Can BZW04-48B replace P6KE48CA in existing designs?
BZW04-48B is not a direct drop-in replacement for P6KE48CA due to differing VBR ranges (P6KE48CA: 42.8–53.2 V; BZW04-48B: 53.2–58.8 V) and package dimensions (DO-15 vs. DO-41). While both share 48 V VWM and similar clamping, the tighter BZW04-48B breakdown improves predictability in precision-clamp applications - but requires verification of mechanical fit and thermal derating curves before substitution.
BZW04-48B 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):
- 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:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
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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