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Vishay General Semiconductor - Diodes Division SMCJ45AHM3/H
- Part No.:
- SMCJ45AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45AHM3/H.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,541
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Product details
Overview
SMCJ45AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 45 V standoff voltage (VWM), 50.0–55.3 V breakdown voltage (VBR), and 1500 W peak pulse power (10/1000 µs). It clamps transients to ≤72.7 V at 20.6 A peak current and operates from –55 °C to +150 °C, commonly used to protect MOSFET gates, sensor signal lines, and DC power rails in automotive ECUs.
For engineers reviewing the SMCJ45AHM3/H datasheet, SMCJ45AHM3/H pinout, SMCJ45AHM3/H application, or SMCJ45AHM3/H equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free RoHS-compliant construction (HM3 suffix), low incremental surge resistance, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ45AHM3/H uses a glass-passivated silicon junction optimized for fast response (<1 ps) to transient overvoltages, with clamping behavior defined by its avalanche breakdown mechanism under 10/1000 µs surge conditions. Its unidirectional polarity features a cathode band marking and exhibits 1.0 µA max reverse leakage at 45 V.
Thermal performance is characterized by 15 °C/W junction-to-lead thermal resistance and 75 °C/W junction-to-ambient (on recommended pad layout), enabling reliable operation up to 150 °C junction temperature without derating below 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin for protected circuitry. |
| VBR @ IT = 1.0 mA | 50.0–55.3 V - Breakdown voltage range confirming robust avalanche initiation threshold for repeatable clamping. |
| VC @ IPPM = 20.6 A | ≤72.7 V - Clamped voltage during 1500 W surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 1500 W - Peak pulse power handling per 10/1000 µs waveform; supports high-energy lightning or ESD events in industrial environments. |
| IFSM | 200 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates capability to survive inductive switch-off spikes. |
| TJ Range | –55 °C to +150 °C - Full automotive-grade operating and storage temperature range; enables under-hood deployment. |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with IPC-7351B land patterns. |
Pinout & Package
SMCJ45AHM3/H is housed in an SMC (DO-214AB) plastic package with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity is marked by a cathode band on the body end; the opposite end is anode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink node | Connected to protected line (e.g., VIN or signal trace); conducts during overvoltage to shunt energy to ground. |
| Anode (non-banded end) | Reference/ground return path | Typically tied to system ground or low-impedance return plane; completes clamping loop during transient events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment power rails per stress test requirements. |
| Halogen-free & RoHS-compliant (HM3) | Meets EU Directive 2011/65/EU and JEDEC J-STD-203; eliminates brominated flame retardants for safer end-of-life processing. |
| Low incremental surge resistance | Enables tighter clamping voltage window (VC – VBR ≈ 22.7 V), reducing voltage overshoot stress on protected MOSFETs or microcontrollers. |
| MSL Level 1 (J-STD-020) | Unlimited floor life at ≤30 °C/60% RH; allows direct placement without baking or dry-pack handling prior to reflow. |
| Glass passivated junction | Provides stable leakage performance (<1 µA at VWM) and long-term reliability under thermal cycling and humidity exposure. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed MCU power inputs in body control modules against load dump (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND, clamping surges within 1 ns to prevent latch-up or gate oxide damage in downstream regulators. Use Value: Withstands 1500 W pulses and maintains <1 µA leakage at 45 V, ensuring no standby current penalty while meeting AEC-Q101 vibration and thermal shock requirements. | Use Scenario: Safeguarding analog output lines of pressure or temperature sensors in PLC I/O modules exposed to field wiring inductive kickback. IC Role / Device Role / Timing Role: TVS connected across signal and ground pins to clamp ±1 kV EFT bursts (IEC 61000-4-4) and 10/1000 µs surges from relay coil switching. Use Value: Low clamping voltage (72.7 V) prevents op-amp saturation or ADC input damage; DO-214AB footprint allows dense placement near connector entry points. |
| DC-DC Converter Input Stage | Consumer USB Power Delivery Port |
Use Scenario: Front-end surge suppression for 48 V input buck converters in telecom rectifiers subjected to lightning-induced surges on AC-DC secondary side. IC Role / Device Role / Timing Role: Unidirectional TVS installed upstream of input filter capacitor to absorb 1500 W transients before they reach controller ICs or MOSFETs. Use Value: High peak pulse current rating (20.6 A) and 200 A IFSM ensure survival of repeated 10/1000 µs events without degradation, supporting >10-year field life. | Use Scenario: Overvoltage protection on 5 V/9 V/15 V USB PD bus lines in portable docking stations where hot-plug transients and cable ESD may exceed 1 kV. IC Role / Device Role / Timing Role: TVS placed between VCONN and GND to limit voltage excursions during plug insertion or nearby discharge events. Use Value: Fast response time and 72.7 V clamping prevent damage to USB PD controllers (e.g., FUSB302) while maintaining <1 µA leakage to avoid battery drain in standby mode. |
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 | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W), same VWM/VBR range. | Not AEC-Q101 qualified; limited to commercial-grade consumer or office equipment. | Select when board space is constrained and surge energy is ≤400 W; verify thermal margin with smaller pad layout. |
| SMCJ45A-M3/57T | Same electrical specs and SMC package, but M3 suffix indicates halogen-free RoHS compliance without AEC-Q101 qualification. | Suitable for industrial automation where automotive qualification is not required but halogen-free materials are mandated. | Choose for cost-sensitive industrial designs needing identical clamping performance and footprint but no automotive validation. |
Compared with SMCJ45AHM3/H, SMAJ45AHE3/A offers reduced surge capacity and thermal robustness, while SMCJ45A-M3/57T matches mechanical and electrical performance but lacks AEC-Q101 validation-making SMCJ45AHM3/H the only option qualified for automotive under-hood use with full halogen-free compliance.
Availability
SMCJ45AHM3/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, DC-DC converter front ends, and USB power delivery protection requiring stable component supply across multi-year production cycles.
Supply support for SMCJ45AHM3/H 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, rectifiers, MOSFETs, and protection devices 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, IEC 61000-4-2/4/5, and lightning-induced surges is critical.
FAQ
What is the clamping voltage of the SMCJ45AHM3/H under maximum rated surge current?
The SMCJ45AHM3/H clamps to a maximum of 72.7 V when subjected to its peak pulse current of 20.6 A (10/1000 µs waveform). This value is measured per standard test conditions in the Vishay datasheet (Document Number: 88394, Rev. 09-Jan-2024) and reflects worst-case voltage seen by protected circuitry during a full 1500 W transient event. Designers must ensure downstream components tolerate this clamped level.
Is the SMCJ45AHM3/H suitable for automotive applications?
Yes, the SMCJ45AHM3/H is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in the Vishay SMCJ5.0A–SMCJ188CA datasheet. It meets stress tests for temperature cycling, humidity, mechanical shock, and high-temperature operating life required for automotive under-hood and chassis-mounted electronics. The SMCJ45AHM3/H is explicitly intended for use in ECUs, ADAS sensors, and infotainment power supplies.
What does the "HM3" suffix indicate in SMCJ45AHM3/H?
The "HM3" suffix in SMCJ45AHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering information, HM3 parts meet JEDEC J-STD-203 material standards and are certified for automotive use. The "H" indicates 7" tape-and-reel packaging (850 units/reel), while "/H" in the full part number confirms this delivery format. This distinguishes it from M3 (halogen-free, non-automotive) and HE3 (RoHS, automotive) variants.
How does the thermal resistance of SMCJ45AHM3/H affect PCB layout?
The SMCJ45AHM3/H has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W and junction-to-ambient (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. To maintain TJ ≤150 °C under 6.5 W steady-state dissipation, designers must provide adequate copper area and minimize trace length to ground planes. Reducing pad size increases RθJA, risking thermal runaway during repetitive surges.
Can SMCJ45AHM3/H be used in bidirectional configurations?
No, the SMCJ45AHM3/H is a unidirectional TVS diode, as indicated by the "A" (not "CA") suffix and presence of a cathode band marking. Bidirectional operation requires the "CA" variant (e.g., SMCJ45CA). Using SMCJ45AHM3/H in reverse-biased AC signal paths would result in forward conduction and failure. For bidirectional protection, select SMCJ45CA-HM3/H or equivalent with symmetrical VBR in both directions.
SMCJ45AHM3/H 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):
- 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/H FAQ
1.How can I place an order for SMCJ45AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45AHM3/H 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/H reliable?
The price and inventory of SMCJ45AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ45AHM3/H is usually 5 days.
3.What payment methods are accepted for SMCJ45AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45AHM3/H?
SMCJ45AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45AHM3/H 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/H?
For technical support, including SMCJ45AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45AHM3/H requirements.
6.How does Aetrix verify that SMCJ45AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMCJ45AHM3/H 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/H meets industry standards.
7.What is the process for return or replacement of SMCJ45AHM3/H?
All SMCJ45AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45AHM3/H, 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/H part is unused and in its original packaging.
Return procedure for SMCJ45AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ45AHM3/H Tags
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