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Vishay General Semiconductor - Diodes Division SMCJ43CAHM3_A/I
- Part No.:
- SMCJ43CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ43CAHM3_A/I.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,199
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Product details
Overview
SMCJ43CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 43 V stand-off voltage (VWM), 69.4 V maximum clamping voltage (VC) at 21.6 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed on power rails and signal lines in automotive ECUs and industrial I/O modules.
For engineers reviewing the SMCJ43CAHM3_A/I datasheet, SMCJ43CAHM3_A/I pinout, SMCJ43CAHM3_A/I application, or SMCJ43CAHM3_A/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, halogen-free RoHS compliance, and thermal resistance (RθJA = 75 °C/W) under real-world PCB pad layouts.
Technical Context
This device operates as a voltage-clamped crowbar during transients: when reverse voltage exceeds its breakdown range (47.8–52.8 V at 1 mA), it enters avalanche conduction to shunt surge energy away from downstream circuitry. Its bidirectional architecture ensures identical clamping behavior across both polarities - critical for AC-coupled interfaces and floating sensor inputs.
Constructed with glass-passivated silicon junctions and rated for TJ = –55 °C to +150 °C, the SMCJ43CAHM3_A/I delivers stable performance under thermal cycling and high-humidity conditions. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification - validated per JESD22-B102 whisker testing and MSL Level 1 reflow compatibility (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - maximum continuous reverse operating voltage before clamping begins; defines safe working margin for 36–48 V nominal systems. |
| VBR min/max | 47.8 V / 52.8 V at IT = 1 mA - guaranteed avalanche onset window; ensures consistent turn-on across production lots and temperature. |
| VC @ IPPM | 69.4 V at 21.6 A (10/1000 μs) - peak clamped voltage seen by protected IC; determines minimum required voltage headroom for downstream components. |
| PPPM | 1500 W - surge power handling capacity; supports IEC 61000-4-5 Level 4 (4 kV line-earth) with appropriate series impedance. |
| ID @ VWM | 1.0 μA - ultra-low leakage at rated stand-off; avoids loading low-power sensor bias networks or battery-backed circuits. |
| RθJA | 75 °C/W - junction-to-ambient thermal resistance on standard 8 mm × 8 mm copper pads; informs derating above TA = 25 °C per Fig. 2. |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood automotive environments and sealed industrial enclosures. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional - no polarity marking; symmetrical cathode/anode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode (bidirectional) | One side of the back-to-back PN junction pair; connects to line or signal trace requiring bidirectional surge suppression. |
| Terminal 2 | Cathode (bidirectional) | Other side of the back-to-back PN junction pair; connects to reference plane (GND or return path); forms complete clamping loop. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - eliminates need for polarity-aware layout in differential or AC-coupled paths. |
| AEC-Q101 qualified | Validated for automotive under-hood use including temperature cycling, humidity, and mechanical shock - supports ASIL-B system designs. |
| Halogen-free & RoHS | HM3 suffix confirms compliance with JEDEC J-STD-609A Class 1 and EU RoHS Directive 2011/65/EU - meets Tier-1 automotive sourcing requirements. |
| Low incremental surge resistance | Enables tighter VC specification (69.4 V) at 21.6 A - reduces voltage overshoot during fast transients compared to higher-Rsurge TVS devices. |
| MSL Level 1 | Rated for unlimited floor life and peak reflow of 260 °C - compatible with standard lead-free SMT assembly without baking or special handling. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 12 V/24 V battery-supplied control units exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power input, placed upstream of DC/DC converters and microcontrollers. Use Value: Limits transient excursions to ≤69.4 V, preventing latch-up or gate oxide damage in 3.3 V/5 V logic and analog front-ends. |
Use Scenario: 4–20 mA current loop transmitters interfacing with PLC analog inputs in factory automation cabinets. IC Role / Device Role / Timing Role: Bidirectional surge limiter on twisted-pair field wiring, guarding against ESD and induced lightning surges. Use Value: Maintains signal integrity below 100 mV error band during 1 kV/500 A surge events due to symmetric clamping and sub-μA leakage. |
| Telecom Line Card Surge Suppression | Consumer USB Port ESD Protection |
|
Use Scenario: DSL or Ethernet PHY interface cards subjected to longitudinal surges per GR-1089-CORE and ITU-T K.21. IC Role / Device Role / Timing Role: Secondary protection stage after gas discharge tube (GDT), absorbing residual energy post-GDT arc extinction. Use Value: Clamps residual voltage to <70 V within <1 ns, protecting 100BASE-TX magnetics and PHY transceivers rated for 75 V abs max. |
Use Scenario: USB 2.0 data lines (D+/D−) in portable media players and docking stations exposed to human-body-model (HBM) ESD. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF typical) bidirectional clamp placed directly at connector, before ESD filter ICs. Use Value: Provides <100 V HBM protection while adding <0.5 pF parasitic capacitance - preserves signal rise time and eye diagram integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC43CA | Same VWM (43 V) and VC (69.4 V), but lower PPPM (600 W); SOD-123FL package (smaller footprint, higher RθJA). | Limited to lower-energy transients (IEC 61000-4-2 ±8 kV contact only); unsuitable for ISO 7637-2 Pulse 5a. | Select when board space is constrained and surge threat level is limited to ESD/lightning-induced coupling. |
| SMCJ43CAHE3_A/I | Identical electrical specs and SMC package, but RoHS-compliant without halogen-free certification (E3 vs HM3). | No AEC-Q101 qualification; not approved for automotive under-hood deployment per OEM requirements. | Choose for commercial/industrial applications where halogen-free mandate or automotive qualification is not required. |
Compared with SAC43CA and SMCJ43CAHE3_A/I, the SMCJ43CAHM3_A/I uniquely combines 1500 W surge rating, AEC-Q101 qualification, and halogen-free compliance - making it the only option qualified for high-reliability automotive power domains and green supply chain mandates.
Availability
SMCJ43CAHM3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, telecom line cards, and consumer USB host interfaces requiring stable component supply across multi-year production cycles.
Supply support for SMCJ43CAHM3_A/I 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade validation.
The SMCJ series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure modes must be mitigated without compromising signal fidelity or thermal stability.
FAQ
What is the clamping voltage of SMCJ43CAHM3_A/I at its rated peak pulse current?
The SMCJ43CAHM3_A/I has a maximum clamping voltage (VC) of 69.4 V when subjected to its rated peak pulse current of 21.6 A using the standardized 10/1000 μs waveform. This value is measured under specified test conditions (TA = 25 °C, mounted on 8.0 mm × 8.0 mm copper pads) and defines the upper voltage limit imposed on protected circuitry during surge events. Designers must ensure downstream components tolerate this clamped voltage with margin.
Is SMCJ43CAHM3_A/I suitable for automotive applications?
Yes, the SMCJ43CAHM3_A/I is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments. Its HM3 suffix confirms halogen-free, RoHS-compliant construction and validation per JESD22-B102 whisker testing and MSL Level 1 reflow. The SMCJ43CAHM3_A/I meets requirements for engine control modules, body electronics, and ADAS power supplies where reliability under thermal cycling and vibration is mandatory.
How does the bidirectional design of SMCJ43CAHM3_A/I affect circuit layout?
The bidirectional design of SMCJ43CAHM3_A/I eliminates polarity sensitivity - no cathode band marking is present, and both terminals are functionally identical. This allows placement across AC-coupled signals, differential buses (e.g., RS-485), or floating power domains without orientation constraints. Layout requires symmetric 8 mm × 8 mm copper pads per terminal to maintain specified thermal and surge performance, as defined in the Vishay SMC outline drawing.
What is the maximum leakage current of SMCJ43CAHM3_A/I at its stand-off voltage?
The SMCJ43CAHM3_A/I exhibits a maximum reverse leakage current (ID) of 1.0 μA when biased at its 43 V stand-off voltage (VWM) and tested at TA = 25 °C. This ultra-low leakage ensures minimal impact on high-impedance sensor bias networks, battery-powered circuits, and precision analog signal paths - critical for maintaining accuracy in 4–20 mA loops and thermocouple amplifiers.
Does SMCJ43CAHM3_A/I require derating at elevated ambient temperatures?
Yes, the SMCJ43CAHM3_A/I must be derated above TA = 25 °C per Figure 2 in the Vishay datasheet (Document Number: 88394). Its peak pulse power capability decreases linearly with junction temperature, reaching ~50 % of rated 1500 W at TJ ≈ 100 °C. Designers must calculate actual power dissipation using RθJA = 75 °C/W and apply thermal modeling to ensure TJ remains ≤150 °C under worst-case surge repetition and ambient conditions.
SMCJ43CAHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- 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):
- 21.6A
- 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)
SMCJ43CAHM3_A/I FAQ
1.How can I place an order for SMCJ43CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ43CAHM3_A/I 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 SMCJ43CAHM3_A/I reliable?
The price and inventory of SMCJ43CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ43CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ43CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ43CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ43CAHM3_A/I?
SMCJ43CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ43CAHM3_A/I 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 SMCJ43CAHM3_A/I?
For technical support, including SMCJ43CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ43CAHM3_A/I requirements.
6.How does Aetrix verify that SMCJ43CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ43CAHM3_A/I 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 SMCJ43CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ43CAHM3_A/I?
All SMCJ43CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ43CAHM3_A/I, 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 SMCJ43CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMCJ43CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ43CAHM3_A/I Tags
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