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Taiwan Semiconductor Corporation BZW04-37
- Part No.:
- BZW04-37
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-37.pdf
- Description:
- TVS DIODE 36.8VWM 59.3VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:4,855
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Product details
Overview
BZW04-37 from Taiwan Semiconductor is a unidirectional 400W transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 36.8V working stand-off voltage (VWM), 40.9–45.2V breakdown voltage (VBR @ 1mA), 59.3V maximum clamping voltage (VC @ 6.7A), and DO-204AL (DO-41) axial package - used in automotive lighting control modules to absorb load-dump and inductive switching transients.
For engineers reviewing the BZW04-37 datasheet, BZW04-37 pinout, BZW04-37 application, or BZW04-37 equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD, peak pulse current rating under 10/1000μs waveform, thermal derating above 25°C ambient, and AEC-Q101 qualification status for automotive deployment.
Technical Context
The BZW04-37 operates as a silicon avalanche diode with unidirectional polarity, triggered when reverse voltage exceeds its 40.9–45.2V breakdown threshold. Its low dynamic impedance enables rapid clamping response (<1 ns), limiting transient energy delivered to downstream circuitry during EFT or ISO 7637-2 pulses.
Thermal performance is defined by RθJL = 60°C/W (junction-to-lead) and RθJA = 100°C/W (junction-to-ambient on 10mm leads), supporting operation from –55°C to +175°C junction temperature. It sustains 40A non-repetitive forward surge (8.3ms half-sine) and exhibits <1μA reverse leakage at 36.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 36.8 V - Maximum continuous reverse operating voltage before conduction begins; sets upper limit for protected rail voltage. |
| VBR @ IT=1mA | 40.9–45.2 V - Breakdown voltage range at 1mA test current; defines turn-on threshold tolerance for design margining. |
| VC @ IPP=6.7A | 59.3 V - Clamped voltage at 10/1000μs surge; must remain below absolute max rating of downstream ICs. |
| PPK | 400 W - Peak pulse power handling per single 10/1000μs transient; determines survivability under standardized surge events. |
| ID @ VWM | <1 μA - Reverse leakage at stand-off voltage; ensures minimal quiescent power loss and signal integrity in high-impedance circuits. |
| TJ max | +175°C - Maximum junction temperature; enables use in under-hood automotive environments without derating penalties. |
| RθJL | 60°C/W - Junction-to-lead thermal resistance; informs heatsinking requirements when mounted on PCB copper pads. |
Pinout & Package
Package: DO-204AL (DO-41), axial leaded, cathode band marked on body. Lead finish: pure tin, solderable per J-STD-002. Weight: 0.300 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path / ground reference | Connected to system ground or low-side return; forms current loop during clamping event. |
| Cathode | Protected line input / high-side connection | Connected to supply rail or signal line being protected; voltage referenced to anode during transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified option available | BZW04-37H variant meets stress testing for automotive electronics reliability (temperature cycling, HTRB, etc.). |
| Low clamping ratio (VC/VBR ≈ 1.34) | Ensures tight voltage limiting relative to breakdown - critical for protecting 3.3V/5V logic with narrow VDD margins. |
| Fast response time (<1 ns) | Activates before most microcontroller I/O pins can be damaged by ESD or EFT bursts. |
| RoHS & halogen-free compliant | Meets IEC 61249-2-21 and EU RoHS Directive for environmentally restricted materials in production assemblies. |
| UL 94V-0 molding compound | Prevents flame propagation during fault conditions - required for safety-critical industrial and automotive enclosures. |
Applications
| Automotive Lighting Control | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting LED driver ICs and MOSFET gate drivers from load-dump transients (ISO 16750-2) in headlamp modules. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12V battery rail upstream of DC-DC converter input. Use Value: Limits rail voltage to ≤59.3V during 35V/100ms load dump, preventing destruction of 60V-rated input FETs and regulators. |
Use Scenario: Shielding digital input optocouplers and level-shifters from inductive kickback in solenoid-controlled I/O cards. IC Role / Device Role / Timing Role: Standoff protection on 24V DC input terminals exposed to relay coil de-energization spikes. Use Value: Clamps 100V+ transients to 59.3V within nanoseconds, preserving isolation barrier integrity and preventing false triggering. |
| ESD-Sensitive Sensor Interface | Power Supply Input Stage |
Use Scenario: Safeguarding analog front-end amplifiers and ADC inputs in automotive cabin sensors (e.g., humidity, pressure). IC Role / Device Role / Timing Role: Secondary protection layer after connector-level ESD suppressors, placed adjacent to IC pins. Use Value: Sub-1μA leakage avoids DC offset errors; 59.3V clamping prevents latch-up in 5V-supplied op-amps with ±15V abs max ratings. |
Use Scenario: Front-end surge suppression on AC/DC adapter outputs feeding embedded controllers in smart meters. IC Role / Device Role / Timing Role: Bulk transient absorber on regulated 5V/12V output bus before LDOs and microcontrollers. Use Value: Withstands 400W 10/1000μs surges per IEC 61000-4-5 Level 3, maintaining output regulation during grid disturbances. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36A | Lower PPK (600W), higher VWM (36V), same DO-214AA package - but not axial; requires PCB footprint change. | Designed for surface-mount assembly; lacks axial lead form factor needed for through-hole chassis grounding. | Select SMBJ36A only if SMT layout and thermal pad access are available; BZW04-37 preferred for legacy through-hole designs. |
| P6KE36A | Same DO-204AL package and VWM (36V), but lower PPK (600W), higher VC (64.8V), and no AEC-Q101 option. | Higher clamping voltage reduces margin for 5V logic protection; not qualified for automotive under-hood use. | Choose P6KE36A for cost-sensitive industrial applications where AEC-Q101 and tight VC are not required. |
Compared with SMBJ36A and P6KE36A, the BZW04-37 offers superior clamping voltage (59.3V vs. ≥64.8V), axial DO-41 compatibility for chassis-grounded installations, and optional AEC-Q101 qualification - making it optimal for automotive and high-reliability through-hole TVS deployments.
Availability
BZW04-37 is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC input protection, and ESD-sensitive sensor interface applications requiring stable component supply across multi-year production cycles.
Supply support for BZW04-37 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 developed to deliver high-energy transient suppression in compact axial packages, targeting cost-effective, high-reliability protection for 12V/24V automotive and industrial systems.
FAQ
What is the maximum clamping voltage of the BZW04-37 under standard test conditions?
The BZW04-37 has a maximum clamping voltage (VC) of 59.3 V when subjected to a 10/1000μs surge waveform at 6.7 A peak impulse current. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during transient events. The BZW04-37 maintains this clamping performance across its specified operating temperature range.
Is the BZW04-37 suitable for automotive applications requiring AEC-Q101 qualification?
Yes - the BZW04-37H variant is AEC-Q101 qualified and undergoes stress testing including temperature cycling, high-temperature reverse bias, and accelerated life testing. Standard BZW04-37 is not qualified; engineers must specify the "H" suffix (e.g., BZW04-37H) to receive AEC-Q101-compliant units for automotive under-hood or chassis-mounted use.
How does the BZW04-37 differ from bidirectional versions like BZW04-37B?
The BZW04-37 is unidirectional and features a cathode band marking; it conducts only during reverse overvoltage events. In contrast, BZW04-37B is bidirectional with symmetrical clamping in both polarities and no polarity marking. The BZW04-37 is selected for DC rail protection where polarity is fixed, while BZW04-37B suits AC or floating signal line protection.
What is the thermal resistance from junction to ambient for the BZW04-37 in typical PCB mounting?
The BZW04-37 has a junction-to-ambient thermal resistance (RθJA) of 100°C/W when mounted on a printed circuit board with 10 mm lead lengths. This value assumes standard FR-4 substrate and no additional copper pour; adding thermal pads or extended copper traces reduces effective RθJA and improves surge survivability during repetitive events.
Can the BZW04-37 replace the P6KE36A in existing designs without layout changes?
Yes - the BZW04-37 shares the identical DO-204AL (DO-41) axial package, pinout, and lead spacing with P6KE36A, enabling direct mechanical and electrical replacement. However, engineers must verify that the lower clamping voltage (59.3V vs. 64.8V) and optional AEC-Q101 qualification of BZW04-37 align with system-level surge immunity requirements before substitution.
BZW04-37 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 36.8V
- Voltage - Breakdown (Min):
- 40.9V
- Voltage - Clamping (Max) @ Ipp:
- 59.3V
- Current - Peak Pulse (10/1000µs):
- 6.7A
- 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)
BZW04-37 FAQ
1.How can I place an order for BZW04-37 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-37 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 BZW04-37 reliable?
The price and inventory of BZW04-37 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-37 is usually 5 days.
3.What payment methods are accepted for BZW04-37?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-37 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-37?
BZW04-37 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-37 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 BZW04-37?
For technical support, including BZW04-37 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-37 requirements.
6.How does Aetrix verify that BZW04-37 is sourced from the original manufacturer or authorized distributors?
All BZW04-37 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 BZW04-37 meets industry standards.
7.What is the process for return or replacement of BZW04-37?
All BZW04-37 units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-37, 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 BZW04-37 part is unused and in its original packaging.
Return procedure for BZW04-37:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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