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Taiwan Semiconductor Corporation SMCJ48A
- Part No.:
- SMCJ48A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ48A.pdf
- Description:
- TVS DIODE 48VWM 77.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:4,495
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Product details
Overview
SMCJ48A from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 48V working stand-off voltage (VWM), 53.3–58.9V breakdown voltage (VBR), and 77.4V maximum clamping voltage (VC) at 20A peak pulse current - designed for automotive load-dump and inductive switching surge protection in power supply rails.
For engineers reviewing the SMCJ48A datasheet, SMCJ48A pinout, SMCJ48A application, or SMCJ48A equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction temperature derating above 25°C, moisture sensitivity level (MSL 1), and compatibility with automated SMT placement on high-reliability PCBs.
Technical Context
The SMCJ48A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (53.3–58.9V @ 1mA), clamping transients to ≤77.4V at 20A (10/1000μs waveform). Its glass-passivated junction ensures stable breakdown and low leakage (<1μA @ 48V).
Thermal design relies on RθJA = 55°C/W and RθJC = 10°C/W, supporting continuous operation up to TJ = 150°C. It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for molded compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum DC or continuous AC reverse voltage before clamping begins |
| VBR min/max | 53.3 / 58.9 V @ 1 mA - Ensures reliable turn-on margin above VWM with ±10% tolerance |
| VC @ IPPM | 77.4 V @ 20 A - Clamping voltage during 10/1000μs surge; limits downstream IC stress |
| PPK | 1500 W - Peak pulse power handling per single non-repetitive event (1 ms) |
| IR @ VWM | <1 μA - Negligible leakage at operating voltage, critical for low-power standby circuits |
| TJ max | +150 °C - Enables use in under-hood automotive environments with thermal derating |
| Package | DO-214AB (SMC) - Standardized 2-pin surface-mount outline with cathode band marking |
Pinout & Package
DO-214AB (SMC) package: 2-terminal surface-mount device with cathode band indicating pin 1 (cathode); matte tin-plated leads compliant with J-STD-002 solderability; polarity-marked for unidirectional operation only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Ground reference / low-side connection | Connected to system ground or return path; carries full surge current during clamping |
| Cathode (banded end) | Protected line input / high-side connection | Connected to protected rail (e.g., 48V supply); reverse-biased during normal operation |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Stable VBR over lifetime and temperature; eliminates passivation-related drift in harsh environments |
| ISO 7637-2 compliance | Validated against Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Fast response time | <1.0 ps - Sub-picosecond junction response enables clamping before sensitive ICs experience overvoltage |
| MSL Level 1 rating | No floor life limitation; safe for reflow without baking - reduces manufacturing overhead |
| Halogen-free construction | Complies with IEC 61249-2-21; supports RoHS and green electronics initiatives without performance trade-offs |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: 48V battery-supplied ADAS camera module exposed to load-dump transients during alternator regulation faults. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 48V rail and ground, clamping surges within 1ps to protect PMIC and image sensor. Use Value: Limits voltage to ≤77.4V during 20A ISO 7637-2 Pulse 5a events, preventing latch-up or gate oxide damage in downstream 48V-to-3.3V converters. | Use Scenario: Digital input channel of a programmable logic controller receiving 24–48V dry-contact signals in factory automation. IC Role / Device Role / Timing Role: Primary surge suppression at field-wire entry point, upstream of optocoupler or signal conditioner. Use Value: Absorbs repetitive EFT bursts (IEC 61000-4-4) and inductive kickback from solenoid coils without degradation, maintaining >100k-cycle reliability. |
| Telecom Power Supply Clamp | LED Driver Overvoltage Protection |
Use Scenario: Secondary-side 48V DC output of telecom rectifier subjected to lightning-induced surges on distribution lines. IC Role / Device Role / Timing Role: Final-stage clamping device across output capacitor, shunting energy before it reaches DC-DC controllers. Use Value: 1500W peak power rating handles multi-kA induced surges; low clamping ratio (VC/VWM = 1.61) preserves hold-up time and prevents brownout resets. | Use Scenario: Constant-current LED driver board driving high-brightness arrays in outdoor signage, subject to wiring fault transients. IC Role / Device Role / Timing Role: Parallel-connected TVS across LED string terminals to clamp reverse polarity or open-circuit transients. Use Value: Withstands 1000+ surge events at rated IPPM while maintaining <1μA leakage - avoids false dimming or flicker in standby mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48A | 600W PPK rating, same VWM/VBR/VC specs but lower surge capacity; SMB package (smaller footprint, higher RθJA) | Lower-energy transients (e.g., consumer electronics, non-automotive industrial) | Select SMBJ48A only if system-level surge testing confirms ≤600W requirement and space constraints favor SMB size. |
| SMCJ48CA | Bidirectional variant; identical VWM/VBR/VC but symmetrical clamping in both polarities; same DO-214AB package | AC-coupled or floating signal lines where polarity reversal may occur (e.g., RS-485, CAN bus stubs) | Choose SMCJ48CA only when bidirectional protection is required; unidirectional SMCJ48A offers better leakage and cost efficiency for DC rails. |
Compared with SMBJ48A, the SMCJ48A delivers 2.5× higher surge energy absorption in the same mounting area, enabling robustness in automotive-grade designs; versus SMCJ48CA, it provides tighter leakage control and lower capacitance for DC power rail use, avoiding unnecessary complexity in unidirectional systems.
Availability
SMCJ48A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC input conditioning, and telecom DC power supply clamping requiring stable component supply across extended production lifecycles.
Supply support for SMCJ48A 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in high-reliability protection devices and power management components.
The SMCJ series is part of TSC's Transient Voltage Suppressor portfolio, engineered specifically for ISO 7637-2-compliant automotive and industrial surge immunity with emphasis on repeatable clamping performance and MSL-1 manufacturability.
FAQ
What is the clamping voltage of the SMCJ48A under standard test conditions?
The SMCJ48A has a maximum clamping voltage (VC) of 77.4 V at 20 A peak pulse current (IPPM), measured using the 10/1000 μs double-exponential waveform per IEC 61000-4-5. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during transient events.
Is the SMCJ48A suitable for automotive applications requiring ISO 7637-2 compliance?
Yes, the SMCJ48A is explicitly validated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test profiles. Its 1500W peak power rating, fast sub-picosecond response, and stable VBR over temperature make it appropriate for 12V/24V/48V automotive subsystems including body control modules, ADAS sensors, and infotainment power supplies.
Does the SMCJ48A have a bidirectional version, and how does it differ?
Yes - the SMCJ48CA is the bidirectional counterpart. While both share identical VWM (48 V), VBR (53.3–58.9 V), and VC (77.4 V) ratings, the SMCJ48CA clamps symmetrically in both polarities and lacks a cathode band. The SMCJ48A is unidirectional only and offers lower reverse leakage (<1 μA), making it preferred for DC power rail protection.
What is the thermal resistance profile of the SMCJ48A, and how does it affect PCB layout?
The SMCJ48A has RθJA = 55°C/W and RθJC = 10°C/W. To maintain TJ ≤ 150°C under 1500W pulses, PCB copper area must be optimized: minimum 100 mm² of 2-oz copper per pad with thermal vias to inner/ground planes is recommended. Layout must avoid routing heat-sensitive components near the device.
Can the SMCJ48A be used in place of the SMCJ48 without redesigning the PCB?
Yes - the SMCJ48A and SMCJ48 share identical DO-214AB (SMC) package dimensions, pinout, and marking location. The "A" suffix denotes tighter VBR tolerance (±5% vs. ±10% for non-A variants), resulting in more consistent clamping behavior. No PCB changes are required, and the SMCJ48A is a direct drop-in upgrade for improved parametric yield.
SMCJ48A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- 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:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ48A FAQ
1.How can I place an order for SMCJ48A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ48A 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 reliable?
The price and inventory of SMCJ48A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ48A is usually 5 days.
3.What payment methods are accepted for SMCJ48A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ48A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ48A?
SMCJ48A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ48A 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?
For technical support, including SMCJ48A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ48A requirements.
6.How does Aetrix verify that SMCJ48A is sourced from the original manufacturer or authorized distributors?
All SMCJ48A 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 meets industry standards.
7.What is the process for return or replacement of SMCJ48A?
All SMCJ48A units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ48A, 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 part is unused and in its original packaging.
Return procedure for SMCJ48A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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