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Taiwan Semiconductor Corporation BZW04-128B
- Part No.:
- BZW04-128B
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-128B.pdf
- Description:
- TVS DIODE 128VWM 207VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:2,790
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Product details
Overview
BZW04-128B from Taiwan Semiconductor is a unidirectional transient voltage suppressor diode (TVS) designed for primary overvoltage protection in DC power rails and signal lines. It features a 128 V working stand-off voltage (VWM), 143–158 V breakdown voltage (VBR) at 1 mA, 400 W peak pulse power (10/1000 μs), 2.0 A maximum peak impulse current (IPP), and clamps to 207 V at rated surge current - deployed in automotive lighting control modules and industrial PLC I/O protection.
For engineers reviewing the BZW04-128B datasheet, BZW04-128B pinout, BZW04-128B application, or BZW04-128B equivalent, key selection criteria include verified clamping performance at 207 V under 2.0 A surge, DO-41 package compatibility with through-hole PCB layouts, thermal resistance (RθJL = 60 °C/W), and AEC-Q101 qualification status for automotive-grade reliability validation.
Technical Context
The BZW04-128B operates as a silicon avalanche diode with unidirectional polarity, triggered when reverse voltage exceeds its 143–158 V breakdown range. Its low dynamic impedance ensures rapid clamping response (<1 ns), limiting transient energy delivered to downstream circuitry during ESD or inductive switching events.
It complies with ANSI/IEEE C62.35 for transient suppression and is rated for continuous operation from –55 °C to +175 °C junction temperature. The device sustains 400 W non-repetitive surge power at 25 °C, derating linearly above that ambient per Fig.2 in the official datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 128 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin. |
| VBR @ IT=1 mA | 143–158 V - Verified avalanche onset range; ensures predictable turn-on without premature leakage. |
| VC @ IPP=2.0 A | 207 V - Clamped voltage under full-rated surge; determines protected circuit's maximum transient exposure. |
| PPK (10/1000 μs) | 400 W - Peak pulse power handling; supports robust immunity against ISO 7637-2 Pulse 1/2a/5a transients. |
| RθJL | 60 °C/W - Junction-to-lead thermal resistance; enables reliable heat dissipation into PCB copper traces. |
| TJ Range | –55 to +175 °C - Extended junction temperature capability; suitable for under-hood automotive environments. |
Pinout & Package
Package: DO-204AL (DO-41), axial leaded, epoxy-molded case with cathode band marking. RoHS-compliant, halogen-free, UL 94V-0 rated molding compound. Pure tin-plated leads, JESD201 Class 2 whisker tested.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path in unidirectional TVS configuration. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12 V supply rail); conducts avalanche current during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics per stress test requirements. |
| 400 W surge rating (10/1000 μs) | Withstands high-energy transients common in 24 V commercial vehicle systems without degradation. |
| Clamping ratio VC/VBR ≤ 1.45 | Ensures tight voltage control - critical for protecting 150 V-rated MOSFETs and gate drivers. |
| IR < 1 μA @ 128 V | Negligible standby leakage - avoids battery drain in always-on automotive circuits. |
Applications
| Automotive Lighting Control | Industrial PLC Digital I/O |
|---|---|
Use Scenario: Protecting LED driver ICs and microcontrollers from load-dump transients in headlamp modules. IC Role / Device Role / Timing Role: Primary clamping device on 12 V/24 V supply input, placed upstream of LDO regulators and CAN transceivers. Use Value: Limits transient voltage to 207 V during ISO 7637-2 Pulse 5a (load dump), preventing latch-up or permanent damage to sensitive logic. | Use Scenario: Safeguarding digital input channels from inductive kickback generated by solenoid valves and relay coils. IC Role / Device Role / Timing Role: Standoff protector on isolated optocoupler inputs, absorbing fast-rising spikes before signal conditioning stages. Use Value: Maintains signal integrity by clamping sub-100 ns spikes to ≤207 V, enabling reliable edge detection in real-time control loops. |
| DC Power Rail Protection | ESD-Sensitive Interface Protection |
Use Scenario: Guarding 12 V auxiliary power rails in telematics units against coupling from adjacent high-current circuits. IC Role / Device Role / Timing Role: First-line defense on main power entry point, coordinated with ceramic capacitors and ferrite beads. Use Value: Absorbs up to 400 W surge energy while holding clamping voltage below 210 V - preserving 25 V-rated DC-DC converters. | Use Scenario: Shielding UART and LIN bus pins from human-body-model (HBM) ESD events in infotainment control panels. IC Role / Device Role / Timing Role: Low-capacitance (CJ < 100 pF at zero bias) TVS placed directly at connector interface. Use Value: Responds in <1 ns to ±8 kV HBM discharges, limiting voltage excursion to 207 V without distorting low-speed serial waveforms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120A | DO-214AA (SMB) package; 120 V VWM; 133–147 V VBR; 600 W PPK; RθJA = 40 °C/W (on PCB) | Higher power rating but surface-mount only; requires rework of through-hole layout | Select when board space is constrained and thermal management via PCB copper is optimized. |
| P6KE130A | DO-15 package; 130 V VWM; 144–159 V VBR; 600 W PPK; higher IR (5 μA @ VWM) | Same axial form factor but larger body; less stringent leakage spec impacts low-power sleep modes | Choose for legacy DO-15 footprint compatibility where 5 μA leakage is acceptable. |
Compared with SMBJ120A and P6KE130A, the BZW04-128B offers tighter VWM tolerance (128 V vs. 120/130 V), lower leakage (<1 μA), and AEC-Q101 qualification - making it preferred for new automotive designs requiring validated reliability and minimal standby current.
Availability
BZW04-128B is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC I/O protection, and DC power rail safeguarding requiring stable component supply across production lifecycles.
Supply support for BZW04-128B 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and thyristors - headquartered in Hsinchu, Taiwan.
The BZW04 series was engineered specifically for high-reliability transient suppression in harsh-environment applications, with emphasis on AEC-Q101 compliance, wide VWM coverage (5.8–376 V), and consistent clamping performance across temperature.
FAQ
What is the polarity configuration of the BZW04-128B?
The BZW04-128B is a unidirectional TVS diode, marked with a cathode band indicating the cathode terminal. It conducts in reverse bias during overvoltage events and blocks forward current like a standard rectifier. This polarity allows precise placement on positive supply rails where clamping to ground is required - a key design feature confirmed in the BZW04-128B datasheet's marking diagram and electrical characteristics table.
Is the BZW04-128B AEC-Q101 qualified?
Yes, the BZW04-128B is AEC-Q101 qualified, as explicitly stated in the "FEATURES" section of the official Taiwan Semiconductor datasheet (Version J2104). This qualification covers stress tests including HTGB, AC-H3TRB, TC, and mechanical shock - validating its suitability for automotive electronic control units, body modules, and lighting systems where reliability under thermal and vibration stress is mandatory.
What is the maximum clamping voltage of the BZW04-128B at rated surge current?
The BZW04-128B clamps to a maximum of 207 V when subjected to its rated peak impulse current of 2.0 A (10/1000 μs waveform), as specified in the "MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS" table. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events - a critical parameter for ensuring downstream components remain within their absolute maximum ratings.
Does the BZW04-128B have a bidirectional variant?
No - the BZW04-128B is strictly unidirectional. Its part number suffix "B" denotes the bidirectional variant only for other members of the series (e.g., BZW04-128B is *not* bidirectional; BZW04-128BB would be). The BZW04-128B datasheet lists VBR and VC values exclusively under unidirectional columns, and the marking diagram shows a single cathode band - confirming its unidirectional construction and intended use on DC rails with defined polarity.
What is the thermal resistance from junction to ambient for the BZW04-128B?
The BZW04-128B has a junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on a printed circuit board with 10 mm lead length, as documented in the "THERMAL PERFORMANCE" section. This value assumes standard FR-4 board layout and guides thermal design - for example, at 400 W peak power, junction temperature rise could exceed safe limits unless used in short-duration pulses or with additional heatsinking via copper pour.
BZW04-128B 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):
- 128V
- Voltage - Breakdown (Min):
- 143V
- Voltage - Clamping (Max) @ Ipp:
- 207V
- Current - Peak Pulse (10/1000µs):
- 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)
BZW04-128B FAQ
1.How can I place an order for BZW04-128B through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-128B 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 BZW04-128B reliable?
The price and inventory of BZW04-128B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-128B is usually 5 days.
3.What payment methods are accepted for BZW04-128B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-128B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-128B?
BZW04-128B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-128B 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 BZW04-128B?
For technical support, including BZW04-128B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-128B requirements.
6.How does Aetrix verify that BZW04-128B is sourced from the original manufacturer or authorized distributors?
All BZW04-128B 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 BZW04-128B meets industry standards.
7.What is the process for return or replacement of BZW04-128B?
All BZW04-128B units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-128B, 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 BZW04-128B part is unused and in its original packaging.
Return procedure for BZW04-128B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW04-128B Tags
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