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Vishay General Semiconductor - Diodes Division SMCJ48CAHE3/9AT
- Part No.:
- SMCJ48CAHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ48CAHE3/9AT.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,895
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Product details
Overview
SMCJ48CAHE3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 48 V standoff voltage (VWM), 77.4 V clamping voltage (VC) at 19.4 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM). It protects sensitive ICs, MOSFETs, and sensor signal lines in automotive and industrial power electronics.
For engineers reviewing the SMCJ48CAHE3/9AT datasheet, SMCJ48CAHE3/9AT pinout, SMCJ48CAHE3/9AT application, or SMCJ48CAHE3/9AT equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 1500 W surge rating, low incremental surge resistance, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: during transients exceeding its 48 V stand-off voltage (VWM), it avalanches to clamp the line at ≤77.4 V while diverting up to 19.4 A (10/1000 μs waveform). Its bidirectional symmetry ensures identical clamping in both polarities, eliminating polarity concerns in AC-coupled or floating signal paths.
Constructed with glass-passivated junctions and rated for TJ = –55 °C to +150 °C, the SMCJ48CAHE3/9AT delivers stable performance under thermal stress. Its MSL Level 1 rating and matte tin-plated leads support lead-free reflow per J-STD-020 (260 °C peak), and AEC-Q101 qualification confirms suitability for automotive under-hood environments.
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, defining turn-on threshold |
| VC @ IPPM | 77.4 V - Clamped voltage across device at 19.4 A peak pulse, limiting downstream stress |
| PPPM | 1500 W - Peak surge energy handling capacity using standard 10/1000 μs waveform |
| ID @ VWM | 1.0 μA - Reverse leakage at 48 V ensures minimal standby power loss and signal integrity |
| TJ max | +150 °C - Maximum junction temperature supports operation in engine bay or industrial enclosures |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient enables derating calculations for PCB layout |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H), with 0.126" (3.20 mm) minimum cathode-to-anode distance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during positive transients (bidirectional) | Connects to protected line; symmetric with cathode for AC or floating applications |
| Cathode | Current entry terminal during negative transients (bidirectional) | Connects to protected line; no band marking distinguishes bidirectional variant |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use including temperature cycling, humidity, and mechanical shock |
| 1500 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) without degradation |
| Low clamping ratio (VC/VBR ≈ 1.36) | Minimizes overvoltage exposure to downstream components during fast transients |
| MSL Level 1, 260 °C peak | Enables single-pass lead-free reflow without moisture-related popcorn failure |
| Glass passivated junction | Ensures long-term reliability and stable VBR over lifetime under thermal and electrical stress |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protecting 12 V/24 V power rails feeding ECUs, body control modules, and lighting drivers against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Shunt TVS device clamping transients to safe levels before they reach DC-DC converters or microcontrollers. Use Value: Prevents latch-up or permanent damage in AEC-Q100-compliant ICs by limiting voltage to ≤77.4 V during 100 A/10 ms load dump events. | Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA, 0–5 V) of pressure, temperature, or position sensors in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional clamping element placed at connector interface to absorb ESD (IEC 61000-4-2 ±8 kV contact) and EFT (IEC 61000-4-4 ±2 kV). Use Value: Maintains signal fidelity with <1.0 μA leakage at 48 V, avoiding offset errors in precision measurement circuits. |
| Telecom Line Interface Protection | Consumer Appliance Motor Control |
Use Scenario: Shielding RS-485/RS-422 transceivers and Ethernet PHYs in base stations and network equipment from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary surge suppression stage ahead of secondary protection (e.g., GDT + MOV) in multi-stage telecom protection schemes. Use Value: Fast response (<1 ns) and low clamping enable compliance with GR-1089-CORE and ITU-T K.21 heavy-duty requirements. | Use Scenario: Guarding gate drivers and MCU I/O pins in washing machine, HVAC, or power tool inverters exposed to motor commutation noise and back-EMF spikes. IC Role / Device Role / Timing Role: High-energy transient absorber placed across DC bus or motor phase terminals to suppress >100 V spikes. Use Value: 1500 W rating handles repetitive 50–100 A surges common in BLDC motor drive fault conditions without parametric shift. |
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), smaller SMA package (DO-214AC), same VWM/VC specs | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 | Select when board space is constrained and surge threat level is Class B/C only |
| SMCJ48CAHM3/9AT | Halogen-free construction, identical electrical specs and AEC-Q101 qualification | No functional difference; required only where halogen-free compliance is mandated | Choose for RoHS+halogen-free programs without compromising performance or qualification |
Compared with SMAJ48CAHE3/A and SMCJ48CAHM3/9AT, the SMCJ48CAHE3/9AT uniquely balances 1500 W surge capacity, AEC-Q101 validation, and industry-standard SMC footprint-making it optimal for automotive and industrial designs requiring robust, drop-in surge resilience without layout redesign.
Availability
SMCJ48CAHE3/9AT is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, telecom line protection, and consumer appliance motor control requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMCJ48CAHE3/9AT 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, surface-mount TVS protection for harsh-environment applications-particularly automotive, industrial, and telecom systems demanding AEC-Q101 qualification and repeatable 1500 W surge handling.
FAQ
What is the clamping voltage of the SMCJ48CAHE3/9AT at its rated peak pulse current?
The SMCJ48CAHE3/9AT clamps to a maximum of 77.4 V at its specified peak pulse current of 19.4 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. The clamping voltage directly determines the maximum overvoltage stress imposed on downstream circuitry during surge events, making it a critical parameter for system-level protection design using the SMCJ48CAHE3/9AT.
Is the SMCJ48CAHE3/9AT suitable for automotive applications?
Yes, the SMCJ48CAHE3/9AT is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix. It meets stringent requirements for temperature cycling, mechanical shock, and humidity resistance, and is rated for operation from –55 °C to +150 °C. Its 1500 W surge rating and bidirectional clamping make it appropriate for protecting ECUs, body control modules, and infotainment systems against load dump and ISO 7637-2 pulses. The SMCJ48CAHE3/9AT is intended for under-hood and chassis-mounted applications where reliability under thermal and electrical stress is mandatory.
How does the bidirectional configuration of the SMCJ48CAHE3/9AT affect its circuit implementation?
The bidirectional configuration of the SMCJ48CAHE3/9AT means it provides symmetrical clamping for both positive and negative voltage transients, with no polarity marking on the SMC (DO-214AB) package. This eliminates orientation constraints during placement and simplifies design for AC-coupled lines, differential buses (e.g., RS-485), or floating sensor outputs. Unlike unidirectional TVS diodes, the SMCJ48CAHE3/9AT does not conduct during normal forward bias-it only activates when either terminal exceeds the 48 V stand-off voltage in magnitude. This behavior is confirmed by identical VBR and VC specifications in both directions per Vishay's datasheet.
What is the thermal resistance and how does it impact PCB layout for the SMCJ48CAHE3/9AT?
The SMCJ48CAHE3/9AT 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 per terminal). This value assumes no additional heatsinking and defines the temperature rise above ambient per watt of steady-state power dissipation. Since the device handles only transient energy-not continuous power-the RθJA primarily affects derating of peak pulse power at elevated ambient temperatures, as shown in Figure 2 of the datasheet. For reliable operation in high-temperature environments, designers should follow Vishay's recommended pad dimensions and avoid excessive copper removal near the SMCJ48CAHE3/9AT footprint.
Does the SMCJ48CAHE3/9AT have any special handling or assembly requirements?
The SMCJ48CAHE3/9AT is rated MSL Level 1 per J-STD-020 and supports peak reflow temperatures up to 260 °C, making it compatible with standard lead-free soldering processes without dry-pack or baking requirements. Its matte tin-plated leads meet J-STD-002 and JESD 22-B102 for solderability, and it passes JESD 201 Class 2 whisker testing. No special handling is needed beyond standard ESD precautions. The "9AT" packaging denotes 13-inch tape-and-reel delivery (3500 units per reel), optimized for high-volume SMT placement. The SMCJ48CAHE3/9AT requires no pre-conditioning and may be placed directly from reel into production.
SMCJ48CAHE3/9AT 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ48CAHE3/9AT FAQ
1.How can I place an order for SMCJ48CAHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ48CAHE3/9AT 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 SMCJ48CAHE3/9AT reliable?
The price and inventory of SMCJ48CAHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ48CAHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ48CAHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ48CAHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ48CAHE3/9AT?
SMCJ48CAHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ48CAHE3/9AT 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 SMCJ48CAHE3/9AT?
For technical support, including SMCJ48CAHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ48CAHE3/9AT requirements.
6.How does Aetrix verify that SMCJ48CAHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ48CAHE3/9AT 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 SMCJ48CAHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ48CAHE3/9AT?
All SMCJ48CAHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ48CAHE3/9AT, 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 SMCJ48CAHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ48CAHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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