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Taiwan Semiconductor Corporation BZW04-19B
- Part No.:
- BZW04-19B
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-19B.pdf
- Description:
- TVS DIODE 18.8VWM 30.6VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:9,743
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Product details
Overview
BZW04-19B from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for high-energy surge protection in automotive and industrial power rails. It features a 18.8 V working stand-off voltage (VWM), 20.9–23.1 V breakdown voltage (VBR) at 1 mA, 30.6 V maximum clamping voltage (VC) at 13.0 A peak pulse current, and 400 W peak pulse power rating per 10/1000 μs waveform - deployed to safeguard microcontrollers, CAN transceivers, and sensor interfaces against EFT and load-dump transients.
For engineers reviewing the BZW04-19B datasheet, BZW04-19B pinout, BZW04-19B application, or BZW04-19B equivalent, this page delivers verified electrical parameters, DO-41 package integration guidance, clamping performance under standardized surge waveforms, and AEC-Q101-qualified alternatives for automotive-grade reliability validation.
Technical Context
The BZW04-19B operates as a unidirectional avalanche diode with silicon planar junction construction, optimized for fast response (<1 ns) to transient overvoltages. Its low dynamic impedance ensures stable clamping during 10/1000 μs surges up to 400 W, while its 1 μA reverse leakage at 18.8 V supports low-power standby circuit integrity.
Thermal design is enabled by a 60 °C/W junction-to-lead resistance and 100 °C/W junction-to-ambient rating on standard PCB pads. The device sustains operation across –55 °C to +175 °C junction temperature range and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18.8 V - Maximum continuous DC or RMS voltage the device blocks without conduction. |
| VBR min/max | 20.9 V / 23.1 V at 1 mA - Confirmed avalanche onset range ensuring predictable turn-on during transients. |
| VC @ IPP | 30.6 V at 13.0 A - Clamped voltage seen by protected IC during full-rated 10/1000 μs surge. |
| PPK | 400 W - Peak pulse power handling capability per IEC 61000-4-5 and ISO 7637-2 compliant waveforms. |
| TJ max | +175 °C - Enables placement near hot components (e.g., power MOSFETs, DC/DC inductors) without derating. |
| ID @ VWM | <1 μA - Minimal leakage preserves battery life in always-on automotive modules. |
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 JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground-reference terminal | Connected to system ground or low-side return path; defines reference for clamping action. |
| Cathode | Protected line input | Connected to rail being protected (e.g., 12 V battery feed); conducts surge current to ground when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified option available | Validated for automotive underhood environments including thermal cycling, humidity, and mechanical shock per AEC standard. |
| 400 W peak pulse power (10/1000 μs) | Withstands ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 Level 4 surges without degradation. |
| Clamping ratio VC/VBR = 1.31 typical | Low overvoltage margin ensures downstream ICs remain within absolute maximum ratings during clamping. |
| Reverse leakage <1 μA at VWM | Enables use in ultra-low-quiescent-current systems such as automotive body control modules (BCMs) in sleep mode. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12 V battery line in engine control unit (ECU) exposed to load-dump transients up to 60 V. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC/DC converter input stage. Use Value: Limits transient voltage to ≤30.6 V, preventing latch-up or gate oxide damage in upstream PMICs. |
Use Scenario: 24 V analog input channel of PLC I/O module subject to EFT bursts per IEC 61000-4-4. IC Role / Device Role / Timing Role: Primary surge clamp before signal conditioning op-amp and ADC front-end. Use Value: Sub-1 ns response captures fast EFT edges; 1 μA leakage avoids offset drift in precision measurement paths. |
| LED Driver Overvoltage Clamp | RS-485 Transceiver Bus Protection |
Use Scenario: Constant-current LED driver supply rail in commercial lighting subjected to inductive switching spikes. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output to absorb flyback energy from relay coils or solenoids. Use Value: 400 W rating handles repetitive 100 ms spikes; DO-41 package allows through-hole mounting on high-current traces. |
Use Scenario: RS-485 data lines in factory automation network exposed to ground potential differences and lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional protection (using BZW04-19B's bidirectional variant BZW04-19BB) on differential bus pair. Use Value: Symmetrical clamping (±30.6 V) maintains common-mode rejection while limiting differential overvoltage to safe levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ19A | DO-214AA package; 19 V VWM; 30.6 V VC @ 13.3 A; same 400 W PPK rating. | Surface-mount only; requires reflow-compatible layout; lower thermal mass than DO-41. | Select SMBJ19A for space-constrained PCBs where automated SMT assembly is preferred. |
| P6KE19A | DO-15 package; 19 V VWM; 30.6 V VC @ 13.0 A; 600 W PPK rating (10/1000 μs). | Higher surge rating but larger footprint; higher junction-to-ambient RθJA (75 °C/W vs. 100 °C/W). | Choose P6KE19A when legacy DO-15 compatibility or higher single-pulse margin is required. |
Compared with BZW04-19B, SMBJ19A offers identical clamping performance in a smaller SMT package ideal for dense layouts, while P6KE19A provides greater single-event energy headroom in a through-hole form factor with slightly better thermal dissipation - both serve distinct mechanical and reliability trade-offs in automotive and industrial designs.
Availability
BZW04-19B is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC I/O modules, LED driver power supplies, and RS-485 communication interfaces requiring stable component supply with AEC-Q101 qualification path support.
Supply support for BZW04-19B 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 MOSFETs for automotive, industrial, and consumer markets.
The BZW04 series was engineered specifically for high-reliability transient suppression in harsh environments - emphasizing robust surge handling, low leakage, and extended temperature operation for under-hood and factory-floor applications.
FAQ
What is the polarity configuration of BZW04-19B?
BZW04-19B is a unidirectional TVS diode, with cathode marked by a band on the DO-41 package. It conducts only when the cathode is positive relative to the anode, making it suitable for DC rail protection where polarity is fixed - unlike bidirectional variants (e.g., BZW04-19BB) used on AC or differential lines.
Does BZW04-19B meet AEC-Q101 stress testing requirements?
BZW04-19B itself is not AEC-Q101 qualified; however, the BZW04-19BH variant (with "H" suffix) is explicitly qualified per AEC-Q101. The base BZW04-19B shares identical die and construction but lacks the certified test report - users requiring automotive qualification must specify BZW04-19BH.
What is the maximum surge current BZW04-19B can handle?
BZW04-19B supports a maximum peak impulse current (IPP) of 13.0 A under the standard 10/1000 μs waveform. This value is derived directly from its 30.6 V clamping voltage and 400 W peak power rating (P = V × I), and is validated per ANSI/IEEE C62.35 test conditions.
How does BZW04-19B compare to SMAJ19A in terms of thermal performance?
BZW04-19B (DO-41) has a junction-to-ambient thermal resistance of 100 °C/W on standard PCB pads, whereas SMAJ19A (DO-214AC) is rated at 65 °C/W. The lower RθJA of SMAJ19A enables better steady-state power dissipation, but BZW04-19B's higher thermal mass improves short-duration surge survivability in intermittent fault conditions.
Can BZW04-19B be used in bidirectional signal line protection?
No - BZW04-19B is unidirectional and unsuitable for AC or differential bus protection without external circuitry. For bidirectional applications like RS-485 or USB, the designated variant BZW04-19BB must be used; it features symmetrical breakdown and clamping in both polarities, confirmed in the BZW04 series datasheet Table on page 2.
BZW04-19B 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):
- 18.8V
- Voltage - Breakdown (Min):
- 20.9V
- Voltage - Clamping (Max) @ Ipp:
- 30.6V
- Current - Peak Pulse (10/1000µs):
- 13A
- 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)
BZW04-19B FAQ
1.How can I place an order for BZW04-19B through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-19B 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 BZW04-19B reliable?
The price and inventory of BZW04-19B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-19B is usually 5 days.
3.What payment methods are accepted for BZW04-19B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-19B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-19B?
BZW04-19B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-19B 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 BZW04-19B?
For technical support, including BZW04-19B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-19B requirements.
6.How does Aetrix verify that BZW04-19B is sourced from the original manufacturer or authorized distributors?
All BZW04-19B 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 BZW04-19B meets industry standards.
7.What is the process for return or replacement of BZW04-19B?
All BZW04-19B units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-19B, 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 BZW04-19B part is unused and in its original packaging.
Return procedure for BZW04-19B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW04-19B Tags
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