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Vishay General Semiconductor - Diodes Division SMCJ45AHM3_A/I
- Part No.:
- SMCJ45AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45AHM3_A/I.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,093
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Product details
Overview
SMCJ45AHM3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 45 V stand-off voltage (VWM), 50.0–55.3 V breakdown voltage (VBR) at 1 mA, 72.7 V maximum clamping voltage (VC) at 20.6 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 SMCJ45AHM3_A/I datasheet, SMCJ45AHM3_A/I pinout, SMCJ45AHM3_A/I application, or SMCJ45AHM3_A/I equivalent, key selection criteria include clamping performance under 20.6 A surge, thermal resistance (RθJA = 75 °C/W), AEC-Q101 qualification status, halogen-free RoHS compliance, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This device operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve sub-nanosecond response time and low incremental surge resistance. Its clamping behavior is defined by a 10/1000 µs double-exponential surge waveform, with derating above TA = 25 °C per Figure 2 and thermal impedance characterized up to 100 s pulse duration.
The SMCJ45AHM3_A/I is rated for -55 °C to +150 °C operating junction temperature, meets JESD201 Class 2 whisker resistance, and is qualified to AEC-Q101 - confirming suitability for automotive-grade reliability testing including temperature cycling, humidity bias, and HTRB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - maximum continuous reverse working voltage before significant leakage; sets upper limit for protected circuit DC rail |
| VBR min/max | 50.0 V / 55.3 V at IT = 1 mA - ensures reliable avalanche initiation within tight tolerance band |
| VC @ IPPM | 72.7 V at 20.6 A - defines worst-case voltage seen by downstream IC during 10/1000 µs surge |
| PPPM | 1500 W - peak surge power handling capability under standardized transient waveform |
| ID @ VWM | 1.0 µA - ultra-low reverse leakage preserves power efficiency in battery-sensitive systems |
| TJ max | +150 °C - enables operation in under-hood automotive environments and high-power industrial enclosures |
| RθJA | 75 °C/W - thermal resistance from junction to ambient on recommended 8.0 mm × 8.0 mm pad layout |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Cathode indicated by molded band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; forms current path during reverse-biased surge conduction |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 45 V rail); avalanche breakdown occurs when voltage exceeds VBR relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS power domains |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and JEDEC JS709C requirements for green manufacturing |
| Low-profile SMC package | Height ≤ 2.62 mm enables use in space-constrained PCB layouts without compromising thermal pad area |
| MSL Level 1 rating | Unlimited floor life at ≤30 °C/60% RH; supports standard reflow without baking preconditioning |
| Glass-passivated junction | Enhances long-term stability of VBR and leakage under thermal cycling and humidity stress |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Clamp |
|---|---|
Use Scenario: 12 V/24 V battery-fed ECUs exposed to load dump transients up to ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges before they reach PMIC or MCU input. Use Value: Limits voltage to ≤72.7 V during 20.6 A surge, preventing latch-up or gate oxide damage in downstream regulators. | Use Scenario: Analog output line (e.g., 4–20 mA loop) in factory automation sensors subject to ESD and inductive kickback. IC Role / Device Role / Timing Role: Standoff protection element shunting transient energy away from precision ADC input or op-amp buffer. Use Value: Sub-1 ns response ensures clamping occurs before sensitive analog front-end components experience overstress. |
| Telecom DC Power Feeds | Consumer Device USB Power Rail |
Use Scenario: -48 V telecom rectifier outputs subjected to lightning-induced surges on outdoor plant wiring. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side DC distribution bus feeding line cards. Use Value: 1500 W PPPM rating sustains multiple surge events without degradation under IEEE C62.41 Category B/C conditions. | Use Scenario: 5 V USB Type-C power delivery path in portable audio devices vulnerable to hot-plug transients. IC Role / Device Role / Timing Role: Secondary-level protection after primary fuse, guarding USB controller and charging IC. Use Value: 1.0 µA ID at VWM minimizes standby current drain while maintaining fast clamping margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45AHE3_A/I | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W) | Not suitable for >10 A surge currents or high-temperature ambient deployments | Select only for cost-sensitive, low-energy surge environments with limited board space |
| SMCJ45AHE3_A/I | Same SMC package and electrical specs, but RoHS-compliant without halogen-free certification | Acceptable where halogen-free requirement is not mandated (e.g., non-automotive industrial) | Preferred when AEC-Q101 qualification is required but halogen-free is optional |
Compared with SMCJ45AHM3_A/I, SMAJ45AHE3_A/I offers reduced surge capacity and thermal performance in a smaller footprint, while SMCJ45AHE3_A/I matches mechanical and electrical behavior but lacks halogen-free compliance - making SMCJ45AHM3_A/I the sole choice for AEC-Q101 + halogen-free dual-certified designs.
Availability
SMCJ45AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor modules, and telecom power systems requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMCJ45AHM3_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 application-specific performance.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered for high-energy transient suppression in harsh environments - particularly targeting automotive, industrial, and infrastructure applications demanding AEC-Q101 validation and robust surge immunity.
FAQ
What is the clamping voltage of SMCJ45AHM3_A/I at its rated peak pulse current?
The SMCJ45AHM3_A/I has a maximum clamping voltage (VC) of 72.7 V at its rated peak pulse current (IPPM) of 20.6 A under a 10/1000 µs waveform. This value is measured across the device terminals during surge conduction and defines the upper voltage limit imposed on protected circuitry. The SMCJ45AHM3_A/I maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C junction).
Is SMCJ45AHM3_A/I qualified for automotive applications?
Yes, SMCJ45AHM3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in the SMCJ5.0A–SMCJ188CA datasheet (Document Number 88394, Revision 09-Jan-2024). This qualification covers stress tests including HTGB, H3TRB, TCT, and UHAST - validating its use in engine control, body electronics, and ADAS subsystems where reliability under thermal and humidity cycling is critical. The SMCJ45AHM3_A/I carries full traceability for automotive production lots.
What does the "HM3" suffix indicate in SMCJ45AHM3_A/I?
The "HM3" suffix in SMCJ45AHM3_A/I denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction. Per Vishay's ordering nomenclature, "H" indicates AEC-Q101 qualification, "M3" specifies halogen-free molding compound and lead finish, and "_A/I" identifies the tape-and-reel packaging format (13-inch reel, 3500 units). This distinguishes it from "HE3" (AEC-Q101 + RoHS but not halogen-free) and "E3/M3" commercial-grade variants without automotive qualification.
How does the thermal performance of SMCJ45AHM3_A/I compare to smaller packages like SMAJ?
SMCJ45AHM3_A/I exhibits superior thermal performance versus SMAJ-series devices due to its larger SMC (DO-214AB) package: RθJA = 75 °C/W (on 8.0 mm × 8.0 mm pads) versus ~110 °C/W for SMAJ45AHE3_A/I in DO-214AC. This 32 % lower thermal resistance allows SMCJ45AHM3_A/I to sustain higher surge repetition rates and operate reliably at elevated ambient temperatures - critical in under-hood automotive or enclosed industrial enclosures where airflow is restricted.
Can SMCJ45AHM3_A/I be used in bidirectional configurations?
No, SMCJ45AHM3_A/I is a unidirectional TVS diode, as indicated by the absence of "CA" suffix and presence of cathode band marking. Bidirectional operation requires devices like SMCJ45CA with symmetrical breakdown in both polarities. Using SMCJ45AHM3_A/I in reverse-biased AC or floating signal paths would result in forward conduction and failure. For bidirectional protection at 45 V standoff, select SMCJ45CAHM3_A/I - which shares the same package and AEC-Q101/halogen-free credentials but differs in junction structure and VBR symmetry.
SMCJ45AHM3_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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 20.6A
- 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)
SMCJ45AHM3_A/I FAQ
1.How can I place an order for SMCJ45AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45AHM3_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 SMCJ45AHM3_A/I reliable?
The price and inventory of SMCJ45AHM3_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 SMCJ45AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ45AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45AHM3_A/I?
SMCJ45AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45AHM3_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 SMCJ45AHM3_A/I?
For technical support, including SMCJ45AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45AHM3_A/I requirements.
6.How does Aetrix verify that SMCJ45AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ45AHM3_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 SMCJ45AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ45AHM3_A/I?
All SMCJ45AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45AHM3_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 SMCJ45AHM3_A/I part is unused and in its original packaging.
Return procedure for SMCJ45AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ45AHM3_A/I Tags
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