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Vishay General Semiconductor - Diodes Division SMCJ43AHM3/I
- Part No.:
- SMCJ43AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ43AHM3/I.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,148
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Product details
Overview
SMCJ43AHM3/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection on DC power rails and signal lines. It features a 43 V standoff voltage (VWM), 47.8–52.8 V breakdown voltage (VBR) at 1 mA, 69.4 V clamping voltage (VC) at 21.6 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMCJ43AHM3/I datasheet, SMCJ43AHM3/I pinout, SMCJ43AHM3/I application, or SMCJ43AHM3/I equivalent, key selection criteria include clamping performance under 21.6 A surge, thermal resistance (RθJA = 75 °C/W), AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ43AHM3/I operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve sub-nanosecond response time and low incremental surge resistance. Its clamping action begins at VBR ≥ 47.8 V and limits transient voltages to ≤ 69.4 V at rated IPPM, maintaining system-level protection integrity during ISO 7637-2 or IEC 61000-4-5 compliant surges.
Designed for surface-mount use on PCBs with defined thermal pad layout, it supports continuous operation up to TJ = 150 °C and meets J-STD-020 MSL Level 1 (260 °C peak reflow). The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification - critical for automotive-grade reliability in engine control units and ADAS power domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - maximum continuous reverse operating voltage before clamping initiates; defines safe DC rail margin for 48 V automotive systems. |
| VBR min/max | 47.8 V / 52.8 V at IT = 1 mA - tight breakdown tolerance ensures predictable turn-on across temperature and production lot. |
| VC @ IPPM | 69.4 V at 21.6 A (10/1000 µs) - clamping voltage directly determines protected IC's overvoltage stress level during surge events. |
| PPPM | 1500 W - peak transient energy handling capacity; enables robust protection against load dump and inductive switching transients. |
| RθJA | 75 °C/W - junction-to-ambient thermal resistance under standard 0.31″ × 0.31″ copper pad layout; informs derating above TA = 25 °C. |
| TJ max | +150 °C - maximum junction temperature rating; supports operation in under-hood automotive environments. |
| AEC-Q101 | Qualified - validated for automotive reliability including temperature cycling, HTRB, and ESD per AEC specification; required for ECUs and body controllers. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, polarity indicated by cathode band. Dimensions: 7.11 mm × 6.22 mm × 2.62 mm (L × W × H); compatible with standard SMT pick-and-place equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode of internal avalanche junction | Connected to protected line (e.g., +12 V rail); clamps positive transients to ground when voltage exceeds VBR. |
| Anode | Cathode of internal avalanche junction | Typically tied to circuit ground or low-impedance return path; completes clamping loop during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, infotainment, and ADAS modules requiring long-term reliability under thermal and mechanical stress. |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations and eliminates corrosive halogen compounds in soldering and end-of-life processing. |
| Low incremental surge resistance | Enables tighter clamping (VC − VBR ≈ 21.6 V) and minimizes voltage overshoot during fast-rising transients like ESD or inductive kick. |
| MSL Level 1 (260 °C peak) | Supports single-reflow assembly without moisture sensitivity concerns; eliminates bake-out requirements prior to SMT placement. |
| Glass passivated junction | Provides stable leakage current (< 1.0 µA at VWM), consistent VBR over lifetime, and immunity to humidity-induced parameter drift. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 48 V battery-fed ECUs from load dump transients per ISO 7637-2 Pulse 5a (up to 60 V, 400 ms). IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp surges before LDO or DC-DC converter. Use Value: Limits voltage seen by downstream regulators to ≤ 69.4 V, preventing latch-up or permanent damage during 1500 W transient events. |
Use Scenario: Safeguarding analog output lines of pressure/temperature sensors in factory automation PLCs exposed to relay coil switching noise. IC Role / Device Role / Timing Role: TVS mounted at sensor connector interface to shunt inductive spikes before reaching ADC input or op-amp buffer. Use Value: Clamps 10/1000 µs transients to < 70 V while maintaining < 1.0 µA leakage at 43 V, preserving signal accuracy and offset stability. |
| Telecom DC Power Feeds | Consumer Device USB Power Input |
Use Scenario: Surge suppression on -48 V telecom rectifier outputs feeding base station RF modules. IC Role / Device Role / Timing Role: Unidirectional TVS referenced to system ground, absorbing differential-mode surges induced by lightning coupling on long cable runs. Use Value: Withstands repeated 1500 W pulses without degradation; RθJA = 75 °C/W allows thermal design within chassis airflow constraints. |
Use Scenario: Overvoltage protection on 5 V USB-C power delivery inputs in portable medical monitors subject to accidental adapter misconnection. IC Role / Device Role / Timing Role: TVS placed after USB PD controller but before buck converter to prevent > 20 V faults from propagating to sensitive SoC rails. Use Value: Fast response (< 1 ns) and low VC ensure protected logic remains below absolute maximum ratings even during 21.6 A surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43AHE3/A | Same VWM (43 V), lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W) | Suitable for space-constrained consumer electronics with lower surge exposure; not AEC-Q101 qualified | Select for cost-sensitive, non-automotive designs where 400 W surge rating suffices and thermal budget permits higher junction rise. |
| SMCJ43A-M3/57T | Identical electrical specs and SMC package, but M3 suffix indicates halogen-free RoHS compliance without AEC-Q101 qualification | Applicable in industrial/commercial systems requiring halogen-free materials but no automotive reliability validation | Choose when AEC-Q101 is not mandated but halogen-free content and full 1500 W rating are required. |
Compared with SMCJ43AHM3/I, SMAJ43AHE3/A offers reduced surge capability and thermal performance in a smaller package, while SMCJ43A-M3/57T delivers identical protection without automotive qualification - making SMCJ43AHM3/I the only option combining AEC-Q101, halogen-free, and 1500 W rating in SMC form factor.
Availability
SMCJ43AHM3/I is available at Aetrix Electronics and suitable for automotive ECU power inputs, industrial sensor interfaces, telecom DC feeds, and consumer USB-C power protection requiring stable component supply across extended production lifecycles.
Supply support for SMCJ43AHM3/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, efficiency, and application-specific optimization.
The SMCJ series is engineered for high-power transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against ISO 7637-2, IEC 61000-4-5, and lightning-induced surges is mandatory.
FAQ
What is the clamping voltage of the SMCJ43AHM3/I and how is it measured?
The SMCJ43AHM3/I has a maximum clamping voltage (VC) of 69.4 V, measured at 21.6 A peak pulse current using a 10/1000 µs waveform per IEC 61000-4-5. This value represents the upper limit of voltage imposed on the protected circuit during a standardized surge event and is confirmed in Vishay's datasheet Document Number 88394, page 2. The SMCJ43AHM3/I maintains this clamping performance across its operational temperature range and is validated for repeatable behavior in AEC-Q101 testing.
Is the SMCJ43AHM3/I suitable for automotive applications?
Yes, the SMCJ43AHM3/I is AEC-Q101 qualified, as indicated by the "HM3" suffix and confirmed in the Vishay datasheet revision 09-Jan-2024. It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias, and ESD verification - making it appropriate for engine control units, body electronics, and ADAS power domains. The SMCJ43AHM3/I also meets MSL Level 1 for lead-free reflow, supporting automotive manufacturing requirements.
What does the 'HM3' suffix mean in SMCJ43AHM3/I?
The 'HM3' suffix in SMCJ43AHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering information (page 3 of document 88394), HM3 devices meet JESD 201 Class 2 whisker resistance, UL 94 V-0 flammability, and automotive reliability standards - distinguishing them from M3 (halogen-free, non-automotive) and HE3 (AEC-Q101, non-halogen-free) variants. This makes the SMCJ43AHM3/I uniquely suited for automotive applications requiring both environmental compliance and qualification.
How does the SMCJ43AHM3/I compare to bidirectional TVS diodes like SMCJ43CA?
The SMCJ43AHM3/I is unidirectional and intended for DC line protection where polarity is fixed (e.g., +48 V rail to ground), offering lower leakage and optimized forward conduction characteristics. In contrast, SMCJ43CA is bidirectional and used in AC-coupled or polarity-agnostic paths (e.g., data lines). The SMCJ43AHM3/I's cathode band identifies polarity, while SMCJ43CA has no marking. Both share identical VWM (43 V) and PPPM (1500 W), but SMCJ43AHM3/I provides superior performance in unidirectional DC applications due to its dedicated avalanche structure.
What PCB layout guidance applies to the SMCJ43AHM3/I for optimal thermal and electrical performance?
Vishay specifies mounting the SMCJ43AHM3/I on 0.31″ × 0.31″ (8.0 mm × 8.0 mm) copper pads per terminal to achieve rated PPPM and RθJA = 75 °C/W. Minimizing trace inductance between the device and protected node is critical - short, wide traces reduce voltage overshoot during fast transients. The SMCJ43AHM3/I's DO-214AB outline requires 7.75 mm × 6.60 mm land pattern (per page 5 of document 88394), and thermal vias under pads improve heat dissipation in high-duty-cycle applications.
SMCJ43AHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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)
SMCJ43AHM3/I FAQ
1.How can I place an order for SMCJ43AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ43AHM3/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 SMCJ43AHM3/I reliable?
The price and inventory of SMCJ43AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ43AHM3/I is usually 5 days.
3.What payment methods are accepted for SMCJ43AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ43AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ43AHM3/I?
SMCJ43AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ43AHM3/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 SMCJ43AHM3/I?
For technical support, including SMCJ43AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ43AHM3/I requirements.
6.How does Aetrix verify that SMCJ43AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ43AHM3/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 SMCJ43AHM3/I meets industry standards.
7.What is the process for return or replacement of SMCJ43AHM3/I?
All SMCJ43AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ43AHM3/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 SMCJ43AHM3/I part is unused and in its original packaging.
Return procedure for SMCJ43AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ43AHM3/I Tags
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