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Taiwan Semiconductor Corporation SMBJ43CAH
- Part No.:
- SMBJ43CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ43CAH.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,204
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Product details
Overview
SMBJ43CAH from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for automotive-grade ESD and surge protection in power rails and signal lines. It features a 43 V working stand-off voltage, 600 W peak pulse power rating, clamping voltage of 69.4 V at 9.0 A peak current, and AEC-Q101 qualification for under-hood and infotainment applications.
For engineers reviewing the SMBJ43CAH datasheet, SMBJ43CAH pinout, SMBJ43CAH application, or SMBJ43CAH equivalent, this device is selected for ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, low leakage (<1 µA @ 43 V), fast sub-1 ps response, DO-214AA (SMB) package compatibility, and bipolar transient suppression in CAN, LIN, and sensor interface circuits.
Technical Context
The SMBJ43CAH operates as a symmetrical (bidirectional) avalanche diode with identical electrical characteristics in both polarities, enabling robust protection against reverse- and forward-polarity transients without polarity dependency. Its glass-passivated junction ensures stable breakdown behavior and long-term reliability under repetitive surge stress.
It meets ISO 7637-2 test requirements for automotive electronics-including Pulse 1 (inductive load dump simulation), Pulse 2a/2b (battery disconnect/switching), and Pulse 3a/3b (capacitive coupling noise)-and is rated for junction temperatures from –55 °C to +150 °C with MSL Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR min / max | 47.8 V / 52.8 V - Breakdown occurs within this range at 1 mA test current; defines turn-on threshold tolerance |
| VC @ IPP | 69.4 V @ 9.0 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to safe level |
| PPK | 600 W - Peak pulse power handling per single 10/1000 µs transient; supports high-energy automotive surges |
| ID @ VWM | <1 µA - Ultra-low leakage ensures minimal standby power loss and signal integrity in high-impedance nodes |
| TJ max | +150 °C - Enables operation in engine control units, body controllers, and other high-temperature automotive zones |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking indicating polarity; bidirectional configuration means no functional anode/cathode distinction-both terminals behave identically under reverse or forward transient conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (marked side) | Transient current entry point (either polarity) | Accepts surge current during positive or negative transients; symmetric conduction path |
| Cathode (band side) | Transient current exit point (either polarity) | Completes low-impedance clamp path to ground/rail; identical role to anode in bidirectional mode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, mechanical shock, and humidity testing per JESD22 standards |
| Glass passivated junction | Enhances long-term stability of breakdown voltage and leakage performance across thermal and humidity stress |
| Fast response time <1 ps | Clamps transients before sensitive logic or analog circuitry experiences overvoltage damage |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Complies with full suite of automotive transient immunity requirements without external filtering or timing adjustments |
| MSL Level 1 (J-STD-020) | Zero floor life limitation-can be stored indefinitely and mounted using standard reflow profiles without baking |
Applications
| Automotive CAN Bus Protection | LED Headlamp Driver Protection |
|---|---|
Use Scenario: Protects CAN-H/CAN-L differential pair from load dump, jump-start spikes, and ESD events in vehicle networking. IC Role / Device Role / Timing Role: Bidirectional TVS placed across bus lines to clamp ± transients while preserving signal integrity up to 1 Mbps. Use Value: Maintains CAN communication continuity during ISO 7637-2 Pulse 2b (100 V, 50 ms) and Pulse 3b (±50 V, 150 ns) without latch-up or degradation. | Use Scenario: Shields constant-current LED driver ICs and MOSFET switches from inductive kickback during PWM dimming and ignition transients. IC Role / Device Role / Timing Role: Parallel-connected TVS on 12 V input rail absorbs energy from relay coil collapse and alternator ripple. Use Value: Limits rail voltage to ≤69.4 V during 600 W surges, preventing overvoltage shutdown or gate oxide rupture in driver FETs. |
| Industrial Sensor Interface Protection | Infotainment USB/UART Line Protection |
Use Scenario: Safeguards analog front-end amplifiers and ADC inputs in pressure, temperature, and position sensors exposed to EFT and cable discharge. IC Role / Device Role / Timing Role: Low-capacitance TVS placed at connector entry point to shunt fast transients before signal conditioning stage. Use Value: Sub-1 ps response ensures clamping before 10 ns EFT bursts reach precision op-amps, preserving measurement accuracy. | Use Scenario: Secures UART and USB 2.0 data lines in head units and telematics modules against ESD and conducted noise from docking events. IC Role / Device Role / Timing Role: Bidirectional TVS on TX/RX or D+/D− pairs provides symmetrical protection without signal inversion or DC bias shift. Use Value: 69.4 V clamping prevents latch-up in level translators and transceivers while maintaining <1 µA leakage for battery-backed standby modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ43CA | Same DO-214AC (SMA) package; 600 W PPK; VC = 69.4 V @ 9.0 A; slightly higher RθJA (65 °C/W vs. 55 °C/W) | Compatible in board space-constrained designs but requires thermal pad adjustment due to lower power dissipation margin | Select when existing footprint uses SMA package and legacy BOM allows substitution with minor thermal review |
| ON Semiconductor SMCJ43CA | DO-214AB (SMC) package; 1500 W PPK; VC = 69.4 V @ 20 A; larger footprint and higher surge capacity | Suitable for higher-energy environments (e.g., powertrain ECUs) where 600 W is insufficient | Choose when system-level surge testing exceeds SMBJ rating and PCB layout permits larger SMC outline |
Compared with SMAJ43CA and SMCJ43CA, the SMBJ43CAH offers optimal balance of AEC-Q101 compliance, DO-214AA (SMB) compactness, and 600 W capability-making it ideal for space-limited automotive modules where thermal resistance (55 °C/W) and MSL Level 1 handling are critical.
Availability
SMBJ43CAH is available at Aetrix Electronics and suitable for automotive infotainment systems, body control modules, and LED lighting drivers requiring stable component supply, AEC-Q101 assurance, and ISO 7637-2 compliance.
Supply support for SMBJ43CAH 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 automotive and industrial certifications.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in automotive subsystems, emphasizing robustness, tight parameter distribution, and process-controlled glass passivation for long-term field reliability.
FAQ
What does the "CAH" suffix indicate in SMBJ43CAH?
The "CAH" suffix in SMBJ43CAH denotes a bidirectional configuration (C), AEC-Q101 qualification (A), and high-reliability construction (H). Unlike unidirectional variants (e.g., SMBJ43AH), SMBJ43CAH provides symmetrical clamping for both positive and negative transients without polarity constraints-critical for differential buses like CAN and LIN.
Is SMBJ43CAH compatible with lead-free reflow soldering processes?
Yes, SMBJ43CAH is fully compatible with lead-free reflow soldering per J-STD-020. Its DO-214AA (SMB) package uses matte tin-plated leads rated for solderability per J-STD-002, and its MSL Level 1 rating means no baking is required prior to assembly-even after indefinite storage.
How does SMBJ43CAH meet ISO 7637-2 Pulse 2b requirements?
SMBJ43CAH meets ISO 7637-2 Pulse 2b (battery disconnect transient) by clamping voltages up to 100 V with a maximum VC of 69.4 V at 9.0 A. Its 600 W peak power rating and fast sub-1 ps response ensure energy diversion before downstream components experience overstress-validated across temperature and lifetime cycles per AEC-Q101.
What is the junction-to-ambient thermal resistance (RθJA) of SMBJ43CAH?
The junction-to-ambient thermal resistance (RθJA) of SMBJ43CAH is 55 °C/W under standard JEDEC test conditions (single device on 1-inch² copper pad). This value enables reliable operation at full 600 W surge power in ambient temperatures up to +85 °C when mounted per recommended pad layout in the datasheet.
Can SMBJ43CAH replace SMBJ43AH in a design?
No-SMBJ43CAH cannot directly replace SMBJ43AH without circuit review. SMBJ43AH is unidirectional (anode-cathode asymmetry), while SMBJ43CAH is bidirectional (symmetrical conduction). Substitution may cause unintended conduction paths or failure to clamp one polarity of transient; redesign verification is required.
SMBJ43CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 9A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ43CAH FAQ
1.How can I place an order for SMBJ43CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ43CAH 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 SMBJ43CAH reliable?
The price and inventory of SMBJ43CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ43CAH is usually 5 days.
3.What payment methods are accepted for SMBJ43CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ43CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ43CAH?
SMBJ43CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ43CAH 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 SMBJ43CAH?
For technical support, including SMBJ43CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ43CAH requirements.
6.How does Aetrix verify that SMBJ43CAH is sourced from the original manufacturer or authorized distributors?
All SMBJ43CAH 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 SMBJ43CAH meets industry standards.
7.What is the process for return or replacement of SMBJ43CAH?
All SMBJ43CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ43CAH, 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 SMBJ43CAH part is unused and in its original packaging.
Return procedure for SMBJ43CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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