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Vishay General Semiconductor - Diodes Division SMCJ48CAHM3/H
- Part No.:
- SMCJ48CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ48CAHM3/H.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,617
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Product details
Overview
SMCJ48CAHM3/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 48 V standoff voltage, 1500 W peak pulse power rating, and 77.4 V maximum clamping voltage at 19.4 A peak pulse current. It protects sensitive ICs, MOSFETs, and sensor signal lines in automotive, industrial, and telecom systems against inductive switching transients and lightning-induced surges.
For engineers reviewing the SMCJ48CAHM3/H datasheet, SMCJ48CAHM3/H pinout, SMCJ48CAHM3/H application, or SMCJ48CAHM3/H equivalent, this part is selected for robust bidirectional ESD and surge immunity in space-constrained PCB layouts requiring AEC-Q101 qualification, halogen-free RoHS compliance, and MSL Level 1 moisture sensitivity.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance under repetitive 10/1000 μs transients.
Thermal performance is defined by 75 °C/W junction-to-ambient thermal resistance and 15 °C/W junction-to-lead resistance, supporting reliable operation up to +150 °C junction temperature. The device meets UL 497B recognition and complies with JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 53.3 V / 58.9 V - Breakdown occurs within this range at 1 mA test current, ensuring predictable turn-on |
| VC @ IPPM | 77.4 V - Clamped voltage across device during 19.4 A 10/1000 μs surge, limiting stress on downstream circuitry |
| PPPM | 1500 W - Peak transient energy absorption capability per single 10/1000 μs pulse |
| ID @ VWM | 1.0 μA - Very low leakage at rated standoff voltage, minimizing standby power loss |
| TJ max | +150 °C - Maximum junction temperature rating supports under-hood automotive and high-temperature industrial use |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal footprint |
Pinout & Package
SMCJ48CAHM3/H uses the standard SMC (DO-214AB) package: a 2-terminal surface-mount device with no polarity marking for bidirectional operation. Terminals are matte tin-plated leads solderable per J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point in negative half-cycle | Provides symmetrical conduction path during reverse-polarity surges |
| Cathode | Transient current entry point in positive half-cycle | Enables clamping in both directions without external polarity management |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC signals, differential buses, and unmarked PCB traces without orientation constraints |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and mechanical shock testing |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for global electronics manufacturing and end-of-life recycling |
| MSL Level 1 | Unlimited floor life at ≤30 °C/85 % RH, eliminating bake-out prior to reflow assembly |
| UL 497B recognized | Approved for use in telecommunications and industrial surge protection circuits per safety standard QVGQ2 |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protecting LIN bus transceivers and body control module inputs from load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamp absorbing ±100 V transients while maintaining signal integrity below 48 V operating range. Use Value: Prevents latch-up and gate oxide damage in 5 V/12 V microcontroller I/Os exposed to ISO 7637-2 Pulse 5a/b events. | Use Scenario: Shielding 4–20 mA current loop analog inputs in PLC modules from field wiring surges. IC Role / Device Role / Timing Role: Fast-response voltage limiter diverting >1 kV transients away from precision op-amps and ADC front-ends. Use Value: Maintains <1 μA leakage at 48 V, avoiding offset errors in high-impedance sensor conditioning circuits. |
| Telecom Line Interface | Consumer USB Port Protection |
Use Scenario: Safeguarding Ethernet PHY magnetics and PoE injectors against lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Symmetrical clamping element placed across transformer secondary windings to limit differential and common-mode overvoltage. Use Value: Withstands 1500 W peak pulses without degradation, meeting IEC 61000-4-5 Level 4 requirements. | Use Scenario: Adding secondary-level surge immunity to USB 2.0 data lines in smart home hubs and docking stations. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) bidirectional suppressor placed after ESD diodes to handle higher-energy transients. Use Value: Clamps to 77.4 V within nanoseconds, preventing damage to USB transceivers rated for 5.5 V absolute maximum. |
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 | Same VWM (48 V), lower PPPM (400 W), SMA package (smaller thermal mass) | Suitable only for lower-energy transients; not AEC-Q101 qualified | Select when board space is critical and surge threat level is limited to IEC 61000-4-2 contact discharge |
| SMCJ48CA-E3/57T | Identical electrical specs and SMC package, but commercial-grade (non-AEC-Q101) and RoHS-compliant without halogen-free certification | Lacks automotive qualification and halogen-free assurance; suitable for industrial/commercial use only | Choose for cost-sensitive non-automotive designs where full AEC-Q101 and halogen-free compliance are not required |
Compared with SMCJ48CAHM3/H, SMAJ48CAHE3 offers reduced surge handling and no automotive qualification, while SMCJ48CA-E3/57T matches performance but omits AEC-Q101 and halogen-free status-making SMCJ48CAHM3/H the sole option meeting all three criteria: 1500 W rating, AEC-Q101, and halogen-free compliance.
Availability
SMCJ48CAHM3/H is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, telecom line protection, and consumer USB port hardening requiring stable component supply across multi-year production cycles.
Supply support for SMCJ48CAHM3/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 was developed to deliver high-power transient suppression in compact surface-mount packages for automotive, industrial, and communications equipment where robustness and regulatory compliance are mandatory.
FAQ
What does the 'HM3' suffix indicate in SMCJ48CAHM3/H?
The 'HM3' suffix in SMCJ48CAHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. The 'H' indicates 7-inch tape-and-reel packaging (850 units per reel), and the '/H' revision code confirms compliance with Vishay's latest material and process specifications as of the 09-Jan-2024 datasheet revision. This makes SMCJ48CAHM3/H suitable for automotive applications requiring strict environmental and reliability standards.
Is SMCJ48CAHM3/H unidirectional or bidirectional?
SMCJ48CAHM3/H is a bidirectional TVS diode, as confirmed by the 'CA' suffix in its part number. It provides symmetrical clamping in both polarities, with identical breakdown and clamping characteristics for positive and negative transients. No cathode band marking is present on the SMC (DO-214AB) package, distinguishing it from unidirectional variants like SMCJ48A.
What is the maximum clamping voltage for SMCJ48CAHM3/H at rated surge current?
The maximum clamping voltage (VC) for SMCJ48CAHM3/H is 77.4 V at 19.4 A peak pulse current (IPPM), measured under the standard 10/1000 μs waveform. This value is specified in the Vishay datasheet Document Number 88394 and defines the upper voltage limit imposed on protected circuitry during worst-case transient events, ensuring downstream components remain within safe operating limits.
Can SMCJ48CAHM3/H replace SMCJ48A in an existing design?
No-SMCJ48CAHM3/H cannot directly replace SMCJ48A because they differ fundamentally in polarity: SMCJ48A is unidirectional (cathode-marked), while SMCJ48CAHM3/H is bidirectional (no marking). Substituting them would compromise protection on one polarity unless the circuit topology explicitly requires bidirectional clamping. Always verify signal path symmetry and grounding before interchanging SMCJ48CAHM3/H and SMCJ48A.
What thermal derating applies to SMCJ48CAHM3/H above 25 °C ambient?
SMCJ48CAHM3/H must be derated linearly above TA = 25 °C per Figure 2 in the Vishay datasheet: peak pulse power (PPPM) decreases by approximately 0.8 % per °C rise, based on its 75 °C/W junction-to-ambient thermal resistance. At 85 °C ambient, PPPM drops to ~900 W. Derating ensures junction temperature remains ≤150 °C during surge events, preserving long-term reliability and clamping consistency in SMCJ48CAHM3/H.
SMCJ48CAHM3/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:
- -
- 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/H FAQ
1.How can I place an order for SMCJ48CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ48CAHM3/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 SMCJ48CAHM3/H reliable?
The price and inventory of SMCJ48CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ48CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMCJ48CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ48CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ48CAHM3/H?
SMCJ48CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ48CAHM3/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 SMCJ48CAHM3/H?
For technical support, including SMCJ48CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ48CAHM3/H requirements.
6.How does Aetrix verify that SMCJ48CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMCJ48CAHM3/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 SMCJ48CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMCJ48CAHM3/H?
All SMCJ48CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ48CAHM3/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 SMCJ48CAHM3/H part is unused and in its original packaging.
Return procedure for SMCJ48CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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