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Vishay General Semiconductor - Diodes Division SMCJ48CAHM3/I
- Part No.:
- SMCJ48CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ48CAHM3/I.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,007
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Product details
Overview
SMCJ48CAHM3/I from Vishay General Semiconductor is a bidirectional 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 standoff voltage (VWM), 77.4 V maximum clamping voltage (VC) at 19.4 A peak pulse current (IPPM), and 1500 W peak pulse power (10/1000 µs waveform), suitable for automotive-grade ESD and load-dump surge suppression in engine control units and sensor interfaces.
For engineers reviewing the SMCJ48CAHM3/I datasheet, SMCJ48CAHM3/I pinout, SMCJ48CAHM3/I application, or SMCJ48CAHM3/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), thermal resistance (RθJA = 75 °C/W), and compatibility with automated SMT placement on standard 8.0 mm × 8.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 µA leakage at 48 V), but triggers into low-impedance conduction when transient voltage exceeds its 53.3–58.9 V breakdown range (VBR at 1 mA). Its glass-passivated junction ensures stable avalanche characteristics and fast response (<1 ns).
Designed for bidirectional transients, SMCJ48CAHM3/I delivers symmetrical clamping in both polarities without polarity marking-unlike unidirectional variants-and meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow peak temperature tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before significant leakage begins |
| VBR min/max | 53.3 V / 58.9 V at 1 mA - Confirmed breakdown threshold range defining turn-on consistency |
| VC @ IPPM | 77.4 V at 19.4 A - Clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPPM | 1500 W - Peak surge power handling capacity under standardized transient waveform |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient, guiding heatsinking requirements on PCB |
| AEC-Q101 | Qualified - Validated for automotive electronic systems per stress-test standard |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, matte tin-plated leads, MSL Level 1, 260 °C reflow compatible. No polarity marking-bidirectional operation confirmed.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Common terminal for symmetrical clamping; connects to protected line or ground reference |
| Cathode | Transient return path (bidirectional) | Electrically identical to Anode in CA devices; no functional distinction-both terminals interchangeable |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| AEC-Q101 qualification | Validates reliability for automotive powertrain, body electronics, and ADAS modules requiring long-term field stability |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations and supports lead-free manufacturing with JESD201 Class 2 whisker resistance |
| Low incremental surge resistance | Minimizes VC overshoot during fast transients, improving protection margin for 3.3 V/5 V ICs |
| 1500 W peak pulse power | Withstands ISO 7637-2 Pulse 1, 2a, 3a/b, and IEC 61000-4-5 surges in industrial and automotive designs |
Applications
| Automotive Engine Control Unit (ECU) | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protection of 12 V supply rail against load-dump transients (ISO 16750-2) and alternator ripple in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Shunt TVS diode placed directly across input filter capacitor, clamping surges before they reach LDOs and microcontrollers. Use Value: Limits rail voltage to ≤77.4 V during 100 V/350 ms load dump, preventing brownout or latch-up in 5 V logic domains. | Use Scenario: Guarding CAN_H/CAN_L differential pair against ESD (IEC 61000-4-2 ±25 kV air) and burst noise in factory automation nodes. IC Role / Device Role / Timing Role: Bidirectional clamp connected between CAN_H and CAN_L, absorbing common-mode transients while preserving signal integrity. Use Value: Symmetrical clamping ensures equal protection on both lines without biasing distortion, maintaining CAN bit timing accuracy up to 1 Mbps. |
| Telecom Power Supply Input | Consumer Appliance Motor Drive |
Use Scenario: Safeguarding 48 V telecom rectifier outputs against lightning-induced surges (IEC 61000-4-5 Level 4, 4 kV line-earth). IC Role / Device Role / Timing Role: Primary-stage TVS mounted at board edge, shunting surge energy to chassis ground before DC-DC converters. Use Value: 1500 W rating sustains multiple 4 kV surges without degradation, supporting 10-year field life in outdoor cabinets. | Use Scenario: Suppressing inductive kickback from brushed DC motors in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Across-motor terminals, clamping flyback spikes generated during PWM commutation. Use Value: Fast <1 ns response prevents MOSFET drain-source avalanche failure, reducing field returns by >30% in reliability testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48CAHE3/A | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W), same VWM/VC | Not rated for AEC-Q101; limited to commercial-grade consumer/industrial use | Select when space-constrained layouts prioritize size over automotive qualification and surge margin |
| SMCJ48CA-E3/57T | Same electrical specs and AEC-Q101 qualification, but E3 suffix (RoHS-compliant, non-halogen-free, 7" tape) | Identical performance; differs only in material compliance and packaging format | Select when halogen-free requirement is not mandated and cost-sensitive procurement favors standard E3 variant |
Compared with SMCJ48CAHM3/I, SMAJ48CAHE3/A offers reduced surge robustness and no automotive qualification, while SMCJ48CA-E3/57T matches all electrical and reliability specs but lacks halogen-free certification-making SMCJ48CAHM3/I the optimal choice where both AEC-Q101 and halogen-free compliance are mandatory.
Availability
SMCJ48CAHM3/I is available at Aetrix Electronics and suitable for automotive ECU design, industrial CAN node development, and telecom power system integration requiring stable component supply, full traceability, and long-lifecycle support.
Supply support for SMCJ48CAHM3/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 targets high-energy transient suppression in harsh environments; SMCJ48CAHM3/I specifically addresses automotive and industrial needs where bidirectional clamping, AEC-Q101 validation, and halogen-free compliance are critical.
FAQ
What does the 'CA' suffix indicate in SMCJ48CAHM3/I?
The 'CA' suffix in SMCJ48CAHM3/I denotes a bidirectional configuration, meaning the device provides symmetrical transient voltage suppression in both polarities-no cathode band marking is present, and clamping occurs identically whether voltage is applied anode-to-cathode or cathode-to-anode. This is essential for protecting AC-coupled or floating signal paths like CAN bus or Ethernet PHY interfaces.
Is SMCJ48CAHM3/I qualified for automotive applications?
Yes, SMCJ48CAHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code structure (HM3 suffix) and documentation. This qualification validates its performance under accelerated stress tests including temperature cycling, humidity bias HAST, and mechanical shock-making SMCJ48CAHM3/I suitable for engine control units, body control modules, and ADAS sensors in passenger and commercial vehicles.
How does the HM3 suffix differ from E3 or M3 in SMCJ48CAHM3/I?
The HM3 suffix in SMCJ48CAHM3/I specifies halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance, whereas E3 is RoHS-compliant but not halogen-free, and M3 is halogen-free/RoHS-compliant but not AEC-Q101 qualified. SMCJ48CAHM3/I uniquely combines all three attributes: halogen-free, RoHS, and AEC-Q101-critical for Tier 1 automotive supply chains.
What is the maximum clamping voltage of SMCJ48CAHM3/I and under what test condition?
The maximum clamping voltage (VC) of SMCJ48CAHM3/I is 77.4 V, measured at a peak pulse current (IPPM) of 19.4 A using the standardized 10/1000 µs double-exponential surge waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case transient events, ensuring downstream 5 V or 3.3 V ICs remain within safe operating area.
Can SMCJ48CAHM3/I be used in place of a unidirectional TVS like SMCJ48A?
No-SMCJ48CAHM3/I is strictly bidirectional and cannot replace unidirectional SMCJ48A in circuits requiring polarity-specific clamping, such as DC power rail protection with defined anode/cathode orientation. Substituting SMCJ48CAHM3/I for SMCJ48A would eliminate polarity-based blocking behavior and may compromise protection in rectified or biased signal paths; always verify circuit topology before interchange.
SMCJ48CAHM3/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:
- -
- Bidirectional Channels:
- 1
- 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)
SMCJ48CAHM3/I FAQ
1.How can I place an order for SMCJ48CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ48CAHM3/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 SMCJ48CAHM3/I reliable?
The price and inventory of SMCJ48CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ48CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMCJ48CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ48CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ48CAHM3/I?
SMCJ48CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ48CAHM3/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 SMCJ48CAHM3/I?
For technical support, including SMCJ48CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ48CAHM3/I requirements.
6.How does Aetrix verify that SMCJ48CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ48CAHM3/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 SMCJ48CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMCJ48CAHM3/I?
All SMCJ48CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ48CAHM3/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 SMCJ48CAHM3/I part is unused and in its original packaging.
Return procedure for SMCJ48CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ48CAHM3/I Tags
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