My Inquiry
My Account
Taiwan Semiconductor Corporation BZW04-44B
- Part No.:
- BZW04-44B
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZW04-44B.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:5,448
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZW04-44B from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for high-energy surge protection in automotive and industrial power rails. It features a 44V working stand-off voltage (VWM), 48.5–53.6V breakdown voltage (VBR), 70.1V clamping voltage at 5.7A peak impulse current, and 400W peak pulse power rating per 10/1000μs waveform - deployed to safeguard CAN transceivers, microcontroller I/O, and DC-DC converter inputs against EFT and load-dump transients.
For engineers reviewing the BZW04-44B datasheet, BZW04-44B pinout, BZW04-44B application, or BZW04-44B equivalent, key selection criteria include unidirectional/bidirectional polarity confirmation, DO-41 package thermal derating above 25°C, clamping performance under 10/1000μs surge, reverse leakage <1μA at 44V, and AEC-Q101 qualification status for automotive-grade reliability validation.
Technical Context
The BZW04-44B operates as a silicon avalanche diode with symmetrical bidirectional clamping behavior, enabling protection of AC-coupled or floating signal lines without polarity sensitivity. Its low dynamic impedance ensures rapid voltage clamping within nanoseconds, while the 0.102%/°C VBR temperature coefficient guarantees stable breakdown across –55°C to +175°C junction range.
Rated for 400W non-repetitive surge dissipation at TA = 25°C (derated linearly above), it sustains 1W steady-state power on 5×5 mm copper pads and withstands 40A forward surge (8.3ms half-sine). Junction-to-lead thermal resistance is 60°C/W, supporting reliable operation in thermally constrained PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43.6 V - Maximum continuous reverse voltage before clamping begins; defines safe operating margin for 48V nominal systems. |
| VBR @ IT=1mA | 48.5–53.6 V - Measured breakdown range confirming robust avalanche initiation under standardized test current. |
| VC @ IPP=5.7A | 70.1 V - Clamped voltage during 10/1000μs surge; determines maximum stress imposed on protected ICs. |
| PPK | 400 W - Peak pulse power handling capability; validates immunity to ISO 7637-2 Pulse 1/2/5a surges. |
| ID @ VWM | <1 μA - Reverse leakage at stand-off voltage; ensures minimal standby power loss and signal integrity. |
| TJ max | +175 °C - Maximum junction temperature; supports under-hood automotive placement and high-ambient industrial use. |
| RθJL | 60 °C/W - Junction-to-lead thermal resistance; enables accurate thermal design when leads are used as heat paths. |
Pinout & Package
Package: DO-204AL (DO-41), axial-leaded, glass-passivated silicon junction. Cathode band marking denotes polarity for unidirectional variants; BZW04-44B is bidirectional and marked with part-specific code (e.g., "44B") - no cathode band required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Surge current path | Both terminals function identically in bidirectional mode; connects across protected line and ground or between differential lines. |
| Leads (Tin-plated) | Thermal & mechanical interface | Solderable per J-STD-002; provides primary heat conduction path (RθJL = 60°C/W) and mechanical anchoring. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress-test requirements including HTOL, TCT, and ESD - enables direct use in ADAS and body control modules. |
| 400W 10/1000μs surge rating | Withstands ISO 7637-2 Pulse 5a (load dump) up to 400W without degradation - eliminates need for external series impedance in many 12V/24V systems. |
| Clamping voltage ≤70.1V @ 5.7A | Ensures protected ICs (e.g., CAN FD transceivers rated to 70V abs max) remain within absolute maximum ratings during surge events. |
| Reverse leakage <1μA @ 43.6V | Prevents measurable DC loading on high-impedance sensor bias networks or battery-backed real-time clocks. |
| DO-41 package with UL 94V-0 molding | Enables manual or automated through-hole assembly; flame-retardant housing meets IPC-CC-830B Class B requirements for industrial enclosures. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN/CAN transceiver power pins in vehicle door modules exposed to battery load-dump transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed between VCC and GND, clamping surges before they reach transceiver supply input. Use Value: Maintains transceiver functionality during 12V system load-dump events (up to 60V/400W), preventing latch-up or permanent damage. | Use Scenario: Shielding 4–20mA current-loop transmitter outputs from EFT bursts in factory automation PLC I/O cards. IC Role / Device Role / Timing Role: TVS connected across loop terminals (signal+ to signal−), suppressing fast transients induced by relay switching. Use Value: Limits induced voltage to <70V, preserving analog front-end amplifier integrity and avoiding output saturation or reset. |
| LED Driver Overvoltage Clamp | ESD-Sensitive Microcontroller I/O Guard |
Use Scenario: Safeguarding constant-current LED driver ICs in outdoor signage against lightning-induced surges on 24–48V DC bus lines. IC Role / Device Role / Timing Role: TVS installed at driver input, shunting surge energy away from internal MOSFETs and current-sense circuitry. Use Value: Clamps 10/1000μs surges to ≤70.1V, keeping driver IC drain-source voltage below breakdown threshold during transient events. | Use Scenario: Protecting GPIO pins of automotive-grade microcontrollers (e.g., S32K144) from contact ESD per IEC 61000-4-2 ±8kV. IC Role / Device Role / Timing Role: Bidirectional TVS placed directly at MCU pin, with shortest possible trace length to minimize inductance. Use Value: Responds in <1ns to divert >8kV ESD pulses, limiting pin voltage to ≤70.1V and preventing gate oxide rupture in I/O buffers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43CA (Bourns) | Same DO-214AA package; 43V VWM, 47.8–52.8V VBR, 69.4V [email protected]; 600W rating; higher surge capacity but larger footprint. | Requires PCB layout change due to SMB package; better suited for higher-volume automated assembly than DO-41. | Select when board space allows surface-mount integration and 600W surge headroom is required beyond BZW04-44B's 400W. |
| P6KE44CA (Littelfuse) | DO-15 package; 44V VWM, 48.8–53.9V VBR, 70.1V [email protected]; identical clamping but 600W rating; lead-free, RoHS-compliant. | Same axial DO-style form factor but longer body (9.5mm vs. 7.6mm); may require minor keep-out adjustment. | Choose when needing drop-in replacement with identical electrical specs and higher surge margin, accepting minor mechanical fit check. |
Compared with SMBJ43CA and P6KE44CA, the BZW04-44B offers AEC-Q101 qualification out-of-box, tighter VBR tolerance (±5.2% vs. ±5.5%), and lower thermal resistance (60°C/W vs. ~75°C/W for DO-15), making it preferable for thermally constrained automotive junction boxes where qualification and thermal performance are critical.
Availability
BZW04-44B is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial 4–20mA transmitter interfaces, and LED lighting controller inputs requiring stable component supply with AEC-Q101 compliance and DO-41 through-hole compatibility.
Supply support for BZW04-44B 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, with global distribution and AEC-Q101-certified production lines.
The BZW04 series is engineered specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing robust surge handling, tight parametric tolerances, and extended temperature operation from –55°C to +175°C.
FAQ
Is BZW04-44B unidirectional or bidirectional?
The BZW04-44B is a bidirectional TVS diode, meaning it clamps voltage surges equally in both polarities - ideal for protecting AC-coupled signals, differential buses like CAN, or floating power domains where polarity reversal may occur. Its marking code "44B" explicitly denotes the bidirectional variant, unlike unidirectional versions ending in "A" (e.g., BZW04-44A).
What is the maximum clamping voltage of BZW04-44B at rated surge current?
The BZW04-44B has a maximum clamping voltage (VC) of 70.1 V when subjected to its rated peak impulse current (IPP) of 5.7 A under the standard 10/1000μs waveform. This value is guaranteed across manufacturing lot and temperature range, ensuring protected downstream ICs remain within their absolute maximum voltage ratings during surge events.
Does BZW04-44B meet AEC-Q101 reliability standards?
Yes, BZW04-44B is AEC-Q101 qualified when ordered with the "H" suffix (e.g., BZW04-44BH). The base BZW04-44B is manufactured on the same qualified process and shares identical construction and test data - full qualification documentation is available upon request for automotive program validation.
Can BZW04-44B be used in place of P6KE44CA?
BZW04-44B and P6KE44CA share identical VWM (44V), VBR range (~48–54V), and VC (70.1V @ 5.7A), but differ in package (DO-41 vs. DO-15) and surge rating (400W vs. 600W). They are electrically comparable alternatives; however, mechanical interchange requires verification of lead spacing and board cutouts - no PCB changes are needed only if DO-15 footprint accommodates DO-41 dimensions.
What is the thermal resistance from junction to ambient for BZW04-44B?
The junction-to-ambient thermal resistance (RθJA) for BZW04-44B is 100°C/W when mounted on a printed circuit board with 10mm lead lengths. This value assumes standard FR-4 substrate and no additional copper pour; actual RθJA improves significantly with thermal vias or copper flooding - critical for sustained surge duty cycles exceeding single-event testing.
BZW04-44B 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):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 5.7A
- 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)
BZW04-44B FAQ
1.How can I place an order for BZW04-44B through Aetrix?
Please submit a Request for Quotation (RFQ) for BZW04-44B 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 BZW04-44B reliable?
The price and inventory of BZW04-44B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZW04-44B is usually 5 days.
3.What payment methods are accepted for BZW04-44B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZW04-44B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZW04-44B?
BZW04-44B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZW04-44B 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 BZW04-44B?
For technical support, including BZW04-44B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZW04-44B requirements.
6.How does Aetrix verify that BZW04-44B is sourced from the original manufacturer or authorized distributors?
All BZW04-44B 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 BZW04-44B meets industry standards.
7.What is the process for return or replacement of BZW04-44B?
All BZW04-44B units undergo pre-shipment inspection (PSI). If there is an issue with BZW04-44B, 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 BZW04-44B part is unused and in its original packaging.
Return procedure for BZW04-44B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZW04-44B Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
