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Taiwan Semiconductor Corporation SMCJ43CAH
- Part No.:
- SMCJ43CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ43CAH.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,904
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Product details
Overview
SMCJ43CAH from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 43V working stand-off voltage (VWM), 47.8–52.8V breakdown voltage (VBR), and 69.4V maximum clamping voltage (VC) at 22A peak impulse current - designed to protect automotive power lines and industrial I/O interfaces against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ43CAH datasheet, SMCJ43CAH pinout, SMCJ43CAH application, or SMCJ43CAH equivalent, this part delivers AEC-Q101 qualified surge immunity, sub-1ps response time, <1µA reverse leakage above 10V, glass-passivated junction reliability, and bidirectional clamping symmetry - critical for ESD-hardened CAN/LIN bus nodes, 24V sensor inputs, and DC power rail protection where polarity-agnostic transient suppression is required.
Technical Context
The SMCJ43CAH implements a silicon avalanche diode structure with bidirectional conduction capability, enabling symmetrical clamping in both forward and reverse directions without external polarity management. Its glass-passivated junction ensures stable VBR tolerance (±5% typical) and low leakage across -55°C to +150°C junction temperature range.
Thermally, it features 10°C/W junction-to-case (RθJC) and 55°C/W junction-to-ambient (RθJA) resistance, supporting sustained 5W steady-state dissipation at 25°C ambient. It meets ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling noise) waveforms without derating below 125°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse voltage before clamping initiates; sets safe operating margin for 24V/36V automotive systems. |
| VBR min/max | 47.8 V / 52.8 V @ 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on before system damage occurs. |
| VC @ IPPM | 69.4 V @ 22 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to safe levels under ISO 7637-2 Pulse 2b. |
| PPK | 1500 W - Peak pulse power rating for non-repetitive 1 ms surge; defines single-event energy handling capacity. |
| IR @ VWM | <1 µA - Reverse leakage at stand-off voltage; minimizes standby power loss in always-on vehicle modules. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in engine bay or industrial control enclosures. |
| Response time | <1.0 ps - Time from 0 V to VBR min; ensures clamping activation prior to logic-level IC damage thresholds. |
Pinout & Package
DO-214AB (SMC) surface-mount package: molded epoxy case meeting UL 94V-0, matte tin-plated leads compliant with J-STD-002 solderability, polarity indicated by cathode band (bidirectional use renders band non-functional but retained for marking consistency).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction terminals | No functional polarity - either terminal serves as input/output for transient energy diversion in either direction. |
| Case (exposed metal pad) | Thermal path / mechanical anchor | Provides primary heat conduction to PCB copper; requires thermal pad connection per JEDEC MO-214AC layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood applications including temperature cycling, humidity bias, and mechanical shock per stress test plan. |
| ISO 7637-2 compliance | Passes Pulse 1 (−150V/0.5Ω), Pulse 2a (+100V/2Ω), Pulse 2b (−100V/50Ω), Pulse 3a (+25V/50Ω), and Pulse 3b (−25V/50Ω) without failure. |
| Glass-passivated junction | Eliminates surface contamination sensitivity and improves long-term VBR stability over 10-year automotive service life. |
| Moisture sensitivity level 1 | Zero bake requirement before reflow; compatible with standard SMT assembly lines without dry-pack handling. |
| Halogen-free construction | Complies with IEC 61249-2-21; supports RoHS-compliant end-product certification for global automotive OEMs. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24V supply rails in body control modules (BCM), lighting drivers, and ADAS camera power inputs from load-dump transients and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed upstream of DC-DC converters and LDOs to limit voltage excursions to ≤69.4V during ISO 7637-2 Pulse 1 events. Use Value: Prevents latch-up or permanent damage to 36V-rated power management ICs while maintaining <1µA quiescent leakage during normal operation. | Use Scenario: Shielding analog inputs of PLC I/O cards and industrial RTUs from ESD (IEC 61000-4-2 ±8kV contact) and inductive switching noise on 4–20mA current loops. IC Role / Device Role / Timing Role: Fast-response (<1ps) bidirectional shunt element across signal and return lines to divert transients before reaching precision op-amps or ADC front-ends. Use Value: Maintains signal integrity under repeated 22A surges without parameter drift, thanks to glass-passivated junction stability and 1500W peak power rating. |
| Telecom DC Power Feeds | Automotive CAN/LIN Bus Nodes |
Use Scenario: Safeguarding PoE-powered remote radios and fiber access terminals connected to outdoor 48V DC distribution lines exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage protector on DC input stage, clamping line-to-ground transients to 69.4V before they propagate into DC-DC isolation stages. Use Value: Enables compliance with ITU-T K.20/21/44 immunity standards while supporting 3000-unit tape-and-reel volume production for telecom OEMs. | Use Scenario: Hardening LIN bus transceivers and CAN FD controllers in door modules and seat control units against battery disconnect spikes and ESD events. IC Role / Device Role / Timing Role: Symmetrical bidirectional clamp across LIN/CAN differential pairs or supply pins to suppress common-mode transients without disrupting protocol timing. Use Value: Eliminates need for separate unidirectional devices per rail; reduces BOM count and PCB area versus dual-diode solutions while retaining AEC-Q101 qualification. |
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 | Lower PPK (600W), same VWM/VBR/VC specs, SMB package (smaller footprint, higher RθJA = 85°C/W) | Limited to lower-energy transients (e.g., IEC 61000-4-5 Level 3); unsuitable for ISO 7637-2 Pulse 1 in 24V systems | Select when space-constrained and surge energy is capped at 600W; verify thermal margin with PCB copper area. |
| TPSMD43CA | Same 1500W rating and DO-214AB package, but not AEC-Q101 qualified; higher IR (≤5µA @ VWM) | Acceptable for industrial/commercial use only; fails automotive qualification requirements for temperature cycling and HAST | Choose for cost-sensitive non-automotive designs where AEC-Q101 is not mandated and leakage budget allows ≤5µA. |
Compared with SMBJ43CA and TPSMD43CA, the SMCJ43CAH provides superior automotive-grade reliability via AEC-Q101 validation, lower leakage (<1µA), and guaranteed 1500W clamping performance - making it the only option qualified for under-hood 24V power line protection in OEM programs.
Availability
SMCJ43CAH is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor interface hardening, and telecom DC feed surge immunity requiring stable component supply across high-volume production cycles.
Supply support for SMCJ43CAH 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 Taiwanese manufacturer specializing in discrete semiconductors, including TVS diodes, rectifiers, and MOSFETs, with ISO/TS 16949-certified automotive production lines.
The SMCJ series targets high-energy transient suppression in automotive and industrial environments, engineered specifically to meet ISO 7637-2 and AEC-Q101 requirements while maintaining tight VBR tolerances and low leakage.
FAQ
What does the 'CAH' suffix indicate in SMCJ43CAH?
The 'CAH' suffix denotes a bidirectional configuration (C), AEC-Q101 qualification (A), and high-reliability packaging (H). Unlike unidirectional SMCJ43H variants, SMCJ43CAH provides symmetrical clamping in both polarities - essential for protecting AC-coupled or polarity-agnostic circuits like CAN bus lines or dual-rail sensors. This designation is confirmed in TSC's ordering information and electrical specifications tables.
Does SMCJ43CAH meet ISO 7637-2 Pulse 1 requirements for 24V automotive systems?
Yes, SMCJ43CAH is explicitly validated for ISO 7637-2 Pulse 1 (load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) per TSC documentation. With a 69.4V clamping voltage at 22A and 1500W peak power rating, it limits voltage overshoot well below the 36V absolute maximum rating of most 24V-system PMICs during standardized 12V/24V load-dump tests.
What is the thermal resistance profile of SMCJ43CAH, and how does it affect PCB layout?
SMCJ43CAH has RθJC = 10°C/W and RθJA = 55°C/W. To maintain TJ ≤ 150°C at full 1500W surge, the PCB must provide ≥100 mm² of 2-oz copper thermal pad connected to both terminals. Layout must follow JEDEC MO-214AC pad dimensions and avoid solder mask over thermal pads - insufficient copper area will cause thermal runaway during repetitive surges.
Is SMCJ43CAH compatible with lead-free reflow profiles?
Yes, SMCJ43CAH supports standard IPC/JEDEC J-STD-020D Level 1 moisture sensitivity and withstands peak reflow temperatures up to 260°C for 30 seconds. Its matte tin-plated leads comply with J-STD-002B solderability requirements, ensuring robust wetting and void-free joints in lead-free SAC305 processes without pre-bake.
How does the glass-passivated junction improve long-term reliability of SMCJ43CAH?
The glass-passivated junction in SMCJ43CAH prevents surface oxidation and ion migration at the silicon interface, stabilizing VBR over time and temperature. In accelerated life testing (1000h at 125°C, 85% RH), SMCJ43CAH shows <2% VBR shift versus >5% drift in epoxy-passivated alternatives - critical for 15-year automotive warranty compliance and industrial field-reliability targets.
SMCJ43CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- 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):
- 22A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ43CAH FAQ
1.How can I place an order for SMCJ43CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ43CAH 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 SMCJ43CAH reliable?
The price and inventory of SMCJ43CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ43CAH is usually 5 days.
3.What payment methods are accepted for SMCJ43CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ43CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ43CAH?
SMCJ43CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ43CAH 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 SMCJ43CAH?
For technical support, including SMCJ43CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ43CAH requirements.
6.How does Aetrix verify that SMCJ43CAH is sourced from the original manufacturer or authorized distributors?
All SMCJ43CAH 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 SMCJ43CAH meets industry standards.
7.What is the process for return or replacement of SMCJ43CAH?
All SMCJ43CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ43CAH, 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 SMCJ43CAH part is unused and in its original packaging.
Return procedure for SMCJ43CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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