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Vishay General Semiconductor - Diodes Division SMCJ48A-E3/9AT
- Part No.:
- SMCJ48A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ48A-E3/9AT.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,064
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Product details
Overview
SMCJ48A-E3/9AT 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 - deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMCJ48A-E3/9AT datasheet, SMCJ48A-E3/9AT pinout, SMCJ48A-E3/9AT application, or SMCJ48A-E3/9AT equivalent, this page delivers verified electrical parameters, thermal derating behavior, AEC-Q101 qualification status, RoHS-compliant packaging details, and real-world protection use cases for 12–48 V systems subject to ISO 7637-2 and IEC 61000-4-5 transients.
Technical Context
The SMCJ48A-E3/9AT operates as a clamping-type TVS diode with avalanche breakdown mechanism, responding in sub-nanosecond time to transient overvoltages. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<1 μA at 48 V), while its low incremental surge resistance enables effective energy absorption without thermal runaway under repetitive surges.
Thermal performance is defined by RθJA = 75 °C/W (on recommended 8.0 mm × 8.0 mm copper pads) and RθJL = 15 °C/W, supporting operation up to TJ = +150 °C. The device meets MSL Level 1 per J-STD-020 and is rated for 200 A non-repetitive forward surge (IFSM, 8.3 ms half-sine), confirming suitability for high-energy load-dump events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for protected circuit's normal DC rail. |
| VBR min/max | 53.3 V / 58.9 V at IT = 1 mA - Confirmed breakdown range ensures reliable turn-on margin above VWM for noise immunity. |
| VC @ IPPM | 77.4 V at 19.4 A - Clamped voltage during 10/1000 μs surge defines worst-case stress on downstream ICs. |
| PPPM | 1500 W - Peak pulse power handling capacity determines survivability against standardized lightning/surge waveforms. |
| ID @ VWM | <1 μA - Ultra-low reverse leakage preserves battery life and avoids false triggering in low-power sensor nodes. |
| TJ max | +150 °C - Enables deployment in under-hood automotive environments and enclosed industrial enclosures. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height for automated assembly. |
Pinout & Package
SMCJ48A-E3/9AT uses the SMC (DO-214AB) package: a two-terminal, unidirectional surface-mount device with cathode band marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker test requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or return path; forms current loop during clamping event. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 48 V rail); polarity band identifies this end for correct PCB orientation. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Withstands ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 Combination Wave (1.2/50 μs + 8/20 μs) surges without failure. |
| AEC-Q101 qualified (via HE3/HM3 variants) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD; SMCJ48A-E3/9AT is RoHS-compliant commercial grade with same die. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage overshoot during fast transients, reducing risk of latch-up or gate oxide damage in MOSFETs and microcontrollers. |
| MSL Level 1 moisture sensitivity | Enables standard reflow without baking; compatible with lead-free solder profiles up to 260 °C peak. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage across temperature (-55 °C to +150 °C) and lifetime. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Clamp |
|---|---|
Use Scenario: Protecting 48 V battery-fed ECUs from load dump transients (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between 48 V rail and chassis ground. Use Value: Limits transient voltage to ≤77.4 V, preventing damage to 60 V-rated DC-DC converters and CAN transceivers. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure sensors from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Fast-response shunt protector mounted at connector entry point. Use Value: Sub-ns response clamps 8 kV contact ESD (IEC 61000-4-2) to safe levels without disrupting 24-bit ADC sampling integrity. |
| Telecom DC Power Feeds | Motor Drive Gate Driver Supply Rail |
Use Scenario: Safeguarding -48 V telecom rectifier outputs against lightning-induced surges entering via long cable runs. IC Role / Device Role / Timing Role: Primary-stage TVS on negative rail, paired with MOV on AC side. Use Value: 1500 W rating absorbs full IEC 61000-4-5 Level 4 (4 kV line-earth) surge energy without degradation. |
Use Scenario: Protecting isolated 15 V gate driver supplies in BLDC inverters from cross-talk and shoot-through induced spikes. IC Role / Device Role / Timing Role: Local clamping device adjacent to gate driver IC supply pins. Use Value: Low VC ensures gate oxide remains below 20 V stress threshold even during 100 ns dv/dt events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48A-E3/61T | Same VWM/VBR/VC specs but SMA (DO-214AC) package; 400 W PPPM rating (vs. 1500 W). | Limited to lower-energy transients (e.g., ESD-only); unsuitable for load dump or lightning. | Select only when space-constrained layouts require smaller footprint and surge threat level is ≤400 W. |
| SMCJ48CA-E3/9AT | Bidirectional variant with identical VWM/VBR/VC, but symmetrical clamping in both polarities. | Required for AC-coupled or floating signal lines where polarity reversal may occur. | Choose when protecting differential pairs, RS-485 buses, or transformer-coupled interfaces without defined DC bias. |
Compared with SMAJ48A-E3/61T, SMCJ48A-E3/9AT delivers 3.75× higher surge energy handling in the same mounting area; versus SMCJ48CA-E3/9AT, it offers tighter leakage control and optimized clamping for unidirectional DC rails, avoiding unnecessary bidirectional capacitance penalty.
Availability
SMCJ48A-E3/9AT is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O terminals, telecom power distribution units, and motor drive gate driver circuits requiring stable component supply and traceable sourcing.
Supply support for SMCJ48A-E3/9AT 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and automotive qualification.
The SMCJ series targets high-energy transient suppression in harsh environments, engineered specifically for ISO 7637-2 compliance and AEC-Q101 validation in 12 V, 24 V, and 48 V automotive and industrial power systems.
FAQ
What is the maximum clamping voltage of the SMCJ48A-E3/9AT under a 10/1000 μs surge?
The SMCJ48A-E3/9AT has a maximum clamping voltage (VC) of 77.4 V when subjected to its rated peak pulse current of 19.4 A with a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The SMCJ48A-E3/9AT maintains this clamping performance across its full operating temperature range of -55 °C to +150 °C.
Is the SMCJ48A-E3/9AT AEC-Q101 qualified?
The SMCJ48A-E3/9AT itself is RoHS-compliant commercial-grade, not AEC-Q101 qualified. However, the identical die is offered in AEC-Q101-qualified versions under ordering codes SMCJ48AHE3_X (RoHS + AEC-Q101) and SMCJ48AHM3_X (halogen-free + RoHS + AEC-Q101). The SMCJ48A-E3/9AT shares all electrical and thermal specifications with those qualified variants, differing only in certification documentation and traceability.
What is the thermal resistance from junction to ambient for the SMCJ48A-E3/9AT?
The typical thermal resistance from junction to ambient (RθJA) for the SMCJ48A-E3/9AT is 75 °C/W, measured on the minimum recommended pad layout: 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes still air convection and is critical for calculating maximum allowable power dissipation at elevated ambient temperatures using the derating curve in Figure 2 of the datasheet. The SMCJ48A-E3/9AT also exhibits RθJL = 15 °C/W to the lead.
Can the SMCJ48A-E3/9AT be used in bidirectional signal protection?
No - the SMCJ48A-E3/9AT is strictly unidirectional and must be oriented with its cathode band toward the positive side of the protected line. For bidirectional protection (e.g., AC signals, differential buses), the SMCJ48CA-E3/9AT is the functionally matched counterpart. Using the SMCJ48A-E3/9AT on a bidirectional line would result in forward conduction during negative excursions, causing failure. The SMCJ48A-E3/9AT is intended solely for DC rail or single-polarity signal clamping.
What is the reverse leakage current of the SMCJ48A-E3/9AT at its stand-off voltage?
The SMCJ48A-E3/9AT exhibits a maximum reverse leakage current (ID) of 1.0 μA at its rated stand-off voltage (VWM) of 48 V and TA = 25 °C. This ultra-low leakage ensures minimal power loss in battery-powered systems and avoids false triggering in high-impedance sensing circuits. Leakage remains below 5 μA up to 80 % of VWM across the full -55 °C to +150 °C operating junction temperature range, as confirmed in the datasheet's electrical characteristics table.
SMCJ48A-E3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ48A-E3/9AT FAQ
1.How can I place an order for SMCJ48A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ48A-E3/9AT 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 SMCJ48A-E3/9AT reliable?
The price and inventory of SMCJ48A-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ48A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ48A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ48A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ48A-E3/9AT?
SMCJ48A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ48A-E3/9AT 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 SMCJ48A-E3/9AT?
For technical support, including SMCJ48A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ48A-E3/9AT requirements.
6.How does Aetrix verify that SMCJ48A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ48A-E3/9AT 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 SMCJ48A-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ48A-E3/9AT?
All SMCJ48A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ48A-E3/9AT, 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 SMCJ48A-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ48A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ48A-E3/9AT Tags
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