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Vishay General Semiconductor - Diodes Division SMCJ48AHM3/I
- Part No.:
- SMCJ48AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ48AHM3/I.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,360
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Product details
Overview
SMCJ48AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount 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 48 V stand-off voltage (VWM), 53.3–58.9 V breakdown voltage (VBR) at 1 mA, 77.4 V maximum clamping voltage (VC) at 19.4 A peak pulse current (IPPM), and 1500 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMCJ48AHM3/I datasheet, SMCJ48AHM3/I pinout, SMCJ48AHM3/I application, or SMCJ48AHM3/I equivalent, this device is selected for automotive-grade transient suppression where halogen-free RoHS compliance, AEC-Q101 qualification, and low incremental surge resistance are required in engine control units, infotainment power supplies, and sensor interface protection circuits.
Technical Context
The SMCJ48AHM3/I operates as a unidirectional avalanche diode, clamping transients above its breakdown threshold while maintaining low leakage (<1.0 µA at 48 V) under normal operation. Its glass-passivated junction ensures stable VBR tolerance and fast response time (<1.0 ns), enabling effective suppression of ESD, lightning-induced surges, and inductive switching spikes.
Thermally, it supports continuous operation up to +150 °C junction temperature, with RθJA = 75 °C/W and RθJL = 15 °C/W. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification - verified per JESD22-B102 whisker testing and MSL Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 48 V - Maximum continuous reverse voltage before significant leakage; defines operating rail margin for 48 V systems. |
| VBR (Breakdown Voltage) | 53.3–58.9 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering without premature conduction. |
| VC (Clamping Voltage) | 77.4 V at 19.4 A IPPM - Peak voltage seen by protected circuit during 10/1000 µs surge; determines downstream IC survivability. |
| PPPM (Peak Pulse Power) | 1500 W - Sustains high-energy transients (e.g., ISO 7637-2 Pulse 5a) without failure when mounted on 8 mm × 8 mm copper pads. |
| ID (Reverse Leakage) | <1.0 µA at 48 V - Negligible standby power loss and minimal impact on high-impedance sensing nodes. |
| TJ max. | +150 °C - Enables deployment in under-hood automotive environments and industrial power converters. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place. |
Pinout & Package
SMCJ48AHM3/I uses the SMC (DO-214AB) package: a two-terminal, unidirectional surface-mount device with cathode indicated by a band on the body. Terminals are matte tin-plated, solderable per J-STD-002 and JESD22-B102, and rated for MSL Level 1 (peak reflow ≤260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage return path; forms clamping path with cathode during overvoltage events. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 48 V supply rail); conducts avalanche current to anode when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including powertrain and ADAS subsystems; supports long-term reliability under thermal cycling and vibration. |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations without compromising surge performance; eliminates brominated flame retardants in molding compound. |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ratio = 1.45) and higher energy absorption efficiency versus standard TVS diodes. |
| Glass passivated junction | Provides stable VBR tolerance (±5%), reduced parameter drift over lifetime, and immunity to humidity-induced degradation. |
| MSL Level 1 rating | Allows unlimited floor life and single-reflow processing without baking; simplifies manufacturing for high-volume automotive PCB assembly. |
Applications
| Automotive Engine Control Unit (ECU) Power Input | Industrial 48 V DC-DC Converter Output |
|---|---|
|
Use Scenario: Protects microcontroller and CAN transceiver power inputs against load dump (ISO 7637-2 Pulse 5a) and alternator overshoot in 12/48 V dual-battery systems. IC Role / Device Role: Unidirectional TVS clamp placed between 48 V rail and chassis ground, absorbing up to 1500 W surge energy. Use Value: Limits transient voltage to ≤77.4 V, ensuring downstream 5 V LDOs and 3.3 V logic remain within absolute maximum ratings during 120 V/100 ms events. |
Use Scenario: Shields isolated gate drivers and current-sense amplifiers in telecom rectifier modules exposed to AC line surges and hot-swap transients. IC Role / Device Role: Primary overvoltage protector on secondary-side 48 V output bus, coordinated with upstream MOVs and fuses. Use Value: Clamps 10/1000 µs surges to 77.4 V with <1 µA leakage at 48 V, preserving regulation accuracy and minimizing standby power loss. |
| Automotive Infotainment Power Supply | Onboard Charger (OBC) Sensor Interface |
|
Use Scenario: Safeguards USB-C PD controller and display backlight drivers from battery reverse polarity and jump-start transients. IC Role / Device Role: Unidirectional TVS on 48 V auxiliary rail feeding PMICs; cathode tied to rail, anode to ground. Use Value: Withstands 200 A IFSM (8.3 ms half-sine), surviving repeated jump-start events without parametric shift or catastrophic failure. |
Use Scenario: Protects temperature and current sensors interfacing with 48 V battery packs against ESD (IEC 61000-4-2 ±15 kV) and coupling noise. IC Role / Device Role: Low-capacitance TVS (CJ ≈ 100 pF at 0 V) placed directly at sensor connector, shunting transients to ground. Use Value: Maintains signal integrity with <1 µA leakage at 48 V and fast sub-nanosecond response, preventing false readings during transient 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 |
|---|---|---|---|
| SMAJ48AHE3/A | Same VWM (48 V), lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W) | Suitable for space-constrained consumer electronics; not AEC-Q101 qualified or halogen-free | Select when cost and size dominate, and automotive qualification is unnecessary. |
| SMCJ48A-M3/57T | Identical electrical specs and SMC package; differs only in packaging (7" tape/reel vs. 13" reel) and HM3 (halogen-free) vs. M3 (halogen-free but non-AEC-Q101) | Commercial-grade alternative lacking AEC-Q101 validation; same thermal and surge performance | Choose for industrial applications requiring halogen-free compliance without automotive certification. |
Compared with SMCJ48AHM3/I, SMAJ48AHE3/A offers smaller size but sacrifices 73% peak power handling and automotive qualification; SMCJ48A-M3/57T matches form/fit/function but omits AEC-Q101 validation - making SMCJ48AHM3/I the sole choice for production automotive ECUs requiring full qualification traceability.
Availability
SMCJ48AHM3/I is available at Aetrix Electronics and suitable for automotive engine control units, industrial 48 V power systems, and onboard charger sensor interfaces requiring stable component supply across multi-year production cycles.
Supply support for SMCJ48AHM3/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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SMCJ series delivers standardized, high-power TVS protection optimized for harsh-environment applications - particularly where AEC-Q101 qualification, halogen-free materials, and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of the SMCJ48AHM3/I under a 10/1000 µs surge?
The SMCJ48AHM3/I has a maximum clamping voltage (VC) of 77.4 V at 19.4 A peak pulse current (IPPM) for a 10/1000 µs waveform. This value is measured under standardized test conditions with the device mounted on 8.0 mm × 8.0 mm copper pads per JEDEC guidelines, and defines the upper voltage limit imposed on protected circuitry during surge events.
Is the SMCJ48AHM3/I qualified for automotive use?
Yes, the SMCJ48AHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88394 (Revision 09-Jan-2024). It meets stress tests for temperature cycling, mechanical shock, and humidity resistance required for under-hood and cabin electronics, and is explicitly listed for automotive applications in the "Ordering Information" and "Mechanical Data" sections.
What does the 'HM3' suffix mean in SMCJ48AHM3/I?
The 'HM3' suffix in SMCJ48AHM3/I indicates halogen-free, RoHS-compliant construction with full AEC-Q101 qualification. It distinguishes this variant from commercial-grade versions (e.g., M3) and confirms compliance with JESD22-B102 whisker testing, MSL Level 1 reflow capability, and automotive reliability standards - critical for Tier 1 suppliers and OEM production releases.
Can the SMCJ48AHM3/I be used in bidirectional configurations?
No, the SMCJ48AHM3/I is a unidirectional TVS diode, as indicated by the absence of "CA" in its part number and explicit designation in Vishay's documentation. Bidirectional variants (e.g., SMCJ48CA) exist in the same family but feature symmetric breakdown in both polarities; using SMCJ48AHM3/I in reverse-biased mode risks permanent damage due to forward conduction beyond its 3.5 V VF rating at 100 A.
What is the thermal resistance of the SMCJ48AHM3/I from junction to ambient?
The SMCJ48AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the minimum recommended pad layout (0.31" × 0.31" copper pads). This value assumes still air conditions and is critical for calculating safe power dissipation limits - for example, at TA = 85 °C, derated PD drops to ~4.2 W based on TJ max. = 150 °C.
SMCJ48AHM3/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):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 19.4A
- 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)
SMCJ48AHM3/I FAQ
1.How can I place an order for SMCJ48AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ48AHM3/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 SMCJ48AHM3/I reliable?
The price and inventory of SMCJ48AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ48AHM3/I is usually 5 days.
3.What payment methods are accepted for SMCJ48AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ48AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ48AHM3/I?
SMCJ48AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ48AHM3/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 SMCJ48AHM3/I?
For technical support, including SMCJ48AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ48AHM3/I requirements.
6.How does Aetrix verify that SMCJ48AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ48AHM3/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 SMCJ48AHM3/I meets industry standards.
7.What is the process for return or replacement of SMCJ48AHM3/I?
All SMCJ48AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ48AHM3/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 SMCJ48AHM3/I part is unused and in its original packaging.
Return procedure for SMCJ48AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ48AHM3/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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