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Taiwan Semiconductor Corporation BZW04-145B
- Part No.:
- BZW04-145B
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-145B.pdf
- Description:
- TVS DIODE 145VWM 234VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:4,426
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Product details
Overview
BZW04-145B from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power rails and signal lines. It features a 145 V working stand-off voltage (VWM), 161–179 V breakdown voltage (VBR) at 1 mA, 234 V maximum clamping voltage (VC) at 1.7 A peak pulse current, and 400 W peak pulse power rating per 10/1000 μs waveform - deployed in automotive lighting control, industrial sensor interfaces, and ESD-sensitive microcontroller I/O protection.
For engineers reviewing the BZW04-145B datasheet, BZW04-145B pinout, BZW04-145B application, or BZW04-145B equivalent, key selection criteria include clamping performance under 1.7 A surge, thermal derating above 25°C ambient, DO-41 package compatibility with manual or wave-solder assembly, and AEC-Q101 qualification status for automotive-grade reliability validation.
Technical Context
The BZW04-145B operates as a silicon avalanche diode with unidirectional polarity, triggered when reverse voltage exceeds its 161–179 V breakdown threshold. Its low dynamic impedance ensures rapid clamping response (<1 ns), limiting transient-induced overvoltage to ≤234 V during 10/1000 μs surges up to 400 W.
Thermally, it sustains 175°C maximum junction temperature with 60°C/W junction-to-lead resistance and 100°C/W junction-to-ambient resistance on standard PCB pads. Reverse leakage remains ≤1 μA at 145 V, supporting low-power standby circuit integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 145 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC rail margin. |
| VBR @ IT=1 mA | 161–179 V - Measured breakdown range confirming reliable turn-on threshold for surge detection. |
| VC @ IPP=1.7 A | 234 V - Clamped voltage during 10/1000 μs surge; determines protected circuit's maximum overvoltage exposure. |
| PPK | 400 W - Peak pulse power handling capability; supports IEC 61000-4-5 Level 4 surge immunity compliance. |
| TJ max | 175°C - Maximum junction temperature; enables operation in under-hood automotive or industrial enclosures. |
| RθJL | 60°C/W - Junction-to-lead thermal resistance; informs heatsinking requirements for repetitive surge duty cycles. |
| ID @ VWM | ≤1 μA - Reverse leakage at rated stand-off voltage; preserves low-quiescent-current system design. |
Pinout & Package
Package: DO-204AL (DO-41), axial leaded, epoxy-molded case with cathode band marking for unidirectional polarity. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line (e.g., ground or return path); conducts during forward surge events. |
| Cathode | Reverse-biased clamping terminal | Connected to higher-potential side (e.g., +12 V rail); avalanches into low-impedance state when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified option available | Validated for automotive electronics per stress test requirements including temperature cycling, HTRB, and ESD. |
| 400 W peak pulse power (10/1000 μs) | Supports robust protection against ISO 7637-2 Load Dump and IEC 61000-4-5 surges without degradation. |
| Clamping voltage ≤234 V at 1.7 A | Ensures downstream ICs rated for ≤250 V absolute maximum survive transient events with safety margin. |
| Reverse leakage ≤1 μA at 145 V | Minimizes standby power loss in battery-powered systems and avoids false triggering in high-impedance sensing nodes. |
| DO-41 package with UL 94V-0 molding | Enables cost-effective through-hole assembly and meets flammability requirements for industrial end equipment. |
Applications
| Automotive LED Headlamp Driver Protection | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protects MOSFET gate drivers and current-sense amplifiers in 12 V/24 V LED headlamp modules from load dump transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between supply rail and ground to clamp positive-going surges exceeding 145 V. Use Value: Limits voltage seen by driver ICs to ≤234 V, preventing latch-up or oxide breakdown during ISO 7637-2 Pulse 5a events. |
Use Scenario: Shields 24 V digital input channels in programmable logic controllers from field-wiring induced fast transients. IC Role / Device Role / Timing Role: Standoff device across input terminals to absorb EFT bursts (IEC 61000-4-4) and inductive kickback. Use Value: Maintains ≤1 μA leakage at 24 V nominal, ensuring accurate logic-level detection while surviving 4 kV contact discharge. |
| Smart Meter Power Supply Surge Suppression | Medical Equipment Sensor Interface Protection |
Use Scenario: Guards AC/DC converter primary-side rectifier and controller ICs against lightning-induced surges on mains input. IC Role / Device Role / Timing Role: Primary-side TVS connected anode-to-ground, cathode-to-rectified DC bus to clamp positive spikes. Use Value: Withstands 400 W pulses without failure, enabling compliance with IEC 61000-4-5 Level 4 (4 kV line-earth). |
Use Scenario: Safeguards analog front-end op-amps and ADC inputs in patient-connected devices from ESD events during handling. IC Role / Device Role / Timing Role: Low-leakage TVS on signal lines to limit transient voltage while preserving sub-μA bias currents. Use Value: ≤1 μA leakage at 145 V stand-off ensures no measurable offset error in precision biopotential measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ140A | DO-214AA package; 140 V VWM; 156–172 V VBR; 243 V VC @ 1.7 A; same 400 W rating | Surface-mount footprint requires PCB redesign; lower thermal resistance (RθJA = 50°C/W) improves power handling in dense layouts | Select SMBJ140A for space-constrained SMT designs where reflow compatibility and thermal performance outweigh through-hole assembly benefits. |
| P6KE150A | DO-15 package; 150 V VWM; 167–185 V VBR; 243 V VC @ 1.7 A; 600 W rating but larger physical size | Higher peak power but slower response due to larger junction capacitance (~150 pF vs. ~50 pF for BZW04-145B) | Choose P6KE150A only when legacy DO-15 board space exists and 600 W surge margin is required over 400 W. |
Compared with SMBJ140A and P6KE150A, the BZW04-140B offers identical clamping performance in a smaller DO-41 package with superior high-frequency response, making it optimal for new through-hole designs prioritizing ESD immunity and compactness without sacrificing surge rating.
Availability
BZW04-145B is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC input protection, and smart meter power supply surge suppression requiring stable component supply across production lifecycles.
Supply support for BZW04-145B 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, and rectifiers with global distribution and AEC-Q101 qualification capabilities.
The BZW04 series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing tight VBR tolerance, low leakage, and robust surge endurance in axial-leaded packages.
FAQ
What is the polarity configuration of the BZW04-145B?
The BZW04-145B is a unidirectional TVS diode, marked with a cathode band indicating the cathode terminal. It conducts in forward bias and clamps reverse transients above its breakdown voltage. This polarity must be observed during PCB layout to ensure correct placement across protected lines - incorrect orientation renders the device ineffective against negative-going surges.
Is the BZW04-145B AEC-Q101 qualified?
The BZW04-145B itself is not AEC-Q101 qualified; however, the BZW04-145BH variant (with "H" suffix) is explicitly qualified per AEC-Q101. Engineers requiring automotive-grade validation must specify BZW04-145BH - the base BZW04-145B lacks the full stress-test documentation required for automotive use cases.
What is the maximum clamping voltage of the BZW04-145B under surge conditions?
The BZW04-145B has a maximum clamping voltage (VC) of 234 V when subjected to a 10/1000 μs surge waveform with a peak current (IPP) of 1.7 A. This value is guaranteed across temperature and process variations and defines the upper voltage limit imposed on protected circuitry during transient events.
Can the BZW04-145B be used in bidirectional applications?
No - the BZW04-145B is strictly unidirectional. For bidirectional protection, the BZW04-145BB variant (with "BB" suffix) must be used. The "B" suffix alone denotes unidirectional configuration; using BZW04-145B in bidirectional circuits leaves negative transients unprotected and risks device failure.
What is the thermal resistance from junction to ambient for the BZW04-145B?
The BZW04-145B has a junction-to-ambient thermal resistance (RθJA) of 100°C/W when mounted on a standard PCB with 10 mm lead length. This value assumes typical copper pad layout and is critical for calculating steady-state temperature rise during repetitive surge events or elevated ambient conditions.
BZW04-145B 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):
- 145V
- Voltage - Breakdown (Min):
- 161V
- Voltage - Clamping (Max) @ Ipp:
- 234V
- Current - Peak Pulse (10/1000µs):
- 1.7A
- 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)
BZW04-145B FAQ
1.How can I place an order for BZW04-145B through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-145B 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 BZW04-145B reliable?
The price and inventory of BZW04-145B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-145B is usually 5 days.
3.What payment methods are accepted for BZW04-145B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-145B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-145B?
BZW04-145B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-145B 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 BZW04-145B?
For technical support, including BZW04-145B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-145B requirements.
6.How does Aetrix verify that BZW04-145B is sourced from the original manufacturer or authorized distributors?
All BZW04-145B 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 BZW04-145B meets industry standards.
7.What is the process for return or replacement of BZW04-145B?
All BZW04-145B units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-145B, 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 BZW04-145B part is unused and in its original packaging.
Return procedure for BZW04-145B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW04-145B Tags
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