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Taiwan Semiconductor Corporation SMCJ48CA
- Part No.:
- SMCJ48CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ48CA.pdf
- Description:
- TVS DIODE 48VWM 77.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,358
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Product details
Overview
SMCJ48CA from Taiwan Semiconductor is a bidirectional 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 impulse current - designed for automotive ESD and load-dump protection in power supply rails and CAN/LIN interfaces.
For engineers reviewing the SMCJ48CA datasheet, SMCJ48CA pinout, SMCJ48CA application, or SMCJ48CA equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, <1µA reverse leakage above 10V, and DO-214AB thermal performance (RθJA = 55°C/W).
Technical Context
The SMCJ48CA employs a glass-passivated silicon junction optimized for fast transient suppression without degradation under repetitive surges. Its bidirectional configuration enables symmetrical clamping in AC-coupled or floating signal lines, eliminating polarity concerns in differential bus protection.
It meets ISO 7637-2 test requirements for automotive electrical systems, supporting both Pulse 1 (inductive switch-off) and Pulse 2b (battery disconnect), with thermal derating defined per Fig.2 and peak power validated using the 10/1000µs waveform per REA standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin below system rail (e.g., 48V battery systems) |
| VBR min/max | 53.3 V / 58.9 V @ IT = 1 mA - Confirmed breakdown range ensures reliable turn-on within 10% tolerance of nominal rating |
| VC @ IPPM | 77.4 V @ 20 A - Clamping voltage during 10/1000µs surge defines worst-case overvoltage seen by protected ICs |
| PPK | 1500 W - Peak pulse power handling capacity determines survivability against high-energy transients like load dump |
| IR @ VWM | <1 µA - Ultra-low leakage preserves signal integrity and minimizes standby power loss in always-on circuits |
| TJ max | +150 °C - Junction temperature limit supports operation in under-hood automotive environments |
| RθJA | 55 °C/W - Thermal resistance enables 5W steady-state dissipation on standard 1-in² copper pad with 2oz Cu |
Pinout & Package
DO-214AB (SMC) surface-mount package with matte tin-plated leads, UL 94V-0 molding compound, and polarity indicated by cathode band (not applicable for bidirectional SMCJ48CA - terminals are symmetric).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Terminal 1) | Transient current entry (reverse bias) | Accepts surge current during positive transients relative to cathode; identical behavior to Terminal 2 in bidirectional mode |
| Cathode (Terminal 2) | Transient current entry (forward bias) | Accepts surge current during negative transients; functionally interchangeable with Terminal 1 due to symmetrical construction |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating buses (e.g., RS-485, CAN FD) without external polarity management |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive kick), Pulse 2a/2b (supply interruption), and Pulse 3a/3b (switching noise) - critical for automotive ECUs |
| Sub-1ps response time | Clamps within 1 picosecond from 0 V to VBR min, limiting voltage overshoot before sensitive gate oxides break down |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; compatible with standard SMT assembly processes without floor-life restrictions |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - required for automotive and industrial end-equipment certification |
Applications
| Automotive Power Rail Protection | CAN/LIN Bus Transient Suppression |
|---|---|
Use Scenario: Protecting 48V battery-fed control modules from load dump (Pulse 5a) and jump-start surges up to ±100V. IC Role / Device Role / Timing Role: Primary clamping device placed at main power input, upstream of DC-DC converters and microcontrollers. Use Value: Limits rail voltage to ≤77.4V during 20A transients, preventing latch-up or permanent damage to downstream 5V/3.3V logic. | Use Scenario: Safeguarding CAN FD physical layer transceivers against ESD (±8kV contact) and coupled transients from adjacent high-power wiring. IC Role / Device Role / Timing Role: Bidirectional TVS placed across CAN_H/CAN_L differential pair, referenced to ground via low-inductance layout. Use Value: Maintains signal integrity by clamping common-mode surges while adding <1pF junction capacitance - no data rate degradation at 5 Mbps. |
| Industrial PLC I/O Protection | LED Driver Surge Immunity |
Use Scenario: Shielding 24V digital input channels in programmable logic controllers from inductive switching spikes generated by solenoid valves and relays. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between field input and internal optocoupler input, with series current-limiting resistor. Use Value: Absorbs 1500W pulses without failure, enabling >100,000 surge cycles per IEC 61000-4-5 Level 4 compliance. | Use Scenario: Preventing catastrophic failure of constant-current LED drivers subjected to lightning-induced surges on long outdoor cable runs. IC Role / Device Role / Timing Role: Parallel-connected TVS at driver output terminals, rated for continuous 48V bus operation with thermal margin. Use Value: Clamps 10/1000µs surges to 77.4V, keeping MOSFET drain-source voltage below 100V rating and avoiding avalanche stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48CA | Same VWM/VBR/VC specs but 600W PPK rating and SMB package (smaller footprint, higher RθJA = 85°C/W) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a load dump | Select only when space-constrained and surge energy is confirmed ≤600W |
| 1.5KE48CA | Through-hole TO-204AA (DO-41) package; same 48V rating but slower response (>1ns) and higher IR (5µA) | Not suitable for automated SMT lines; requires wave soldering or hand assembly | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required |
Compared with SMBJ48CA and 1.5KE48CA, the SMCJ48CA delivers 2.5× higher peak power handling in an SMT-optimized package with superior thermal performance and faster response - making it the preferred choice for production automotive and industrial systems requiring robust, automated assembly.
Availability
SMCJ48CA is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC I/O protection, CAN/LIN bus hardening, and LED driver surge immunity requiring stable component supply across multi-year production cycles.
Supply support for SMCJ48CA 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 TVS diodes, rectifiers, MOSFETs, and power management devices since 1979.
The SMCJ series was engineered specifically for automotive-grade transient suppression, targeting ISO 7637-2 and IEC 61000-4-5 compliance in harsh environment applications with zero derating up to +125°C ambient.
FAQ
What is the clamping voltage of the SMCJ48CA at its rated peak pulse current?
The SMCJ48CA has a maximum clamping voltage (VC) of 77.4 V at 20 A peak impulse current (IPPM), measured using the standardized 10/1000 µs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case transients and is verified per ANSI/IEEE C62.35. The SMCJ48CA maintains this clamping performance across its full operating temperature range of –55°C to +150°C.
Is the SMCJ48CA unidirectional or bidirectional, and how does that affect PCB layout?
The SMCJ48CA is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients without polarity dependence. Unlike unidirectional variants (e.g., SMCJ48A), it has no cathode marking and can be placed in either orientation on the PCB. This simplifies layout for differential or floating signal lines such as CAN_H/CAN_L or RS-485, eliminating the need for orientation verification during automated placement.
Does the SMCJ48CA meet automotive transient immunity standards?
Yes, the SMCJ48CA meets ISO 7637-2 requirements for Pulses 1 (inductive switch-off), 2a/2b (battery disconnection), and 3a/3b (capacitive coupling), as explicitly stated in the manufacturer's datasheet. It is qualified for use in automotive electronic control units, body control modules, and infotainment systems where compliance with OEM-level EMC specifications is mandatory. The SMCJ48CA is not rated for Pulse 5a (load dump); for that, higher-voltage variants like SMCJ64CA are recommended.
What is the maximum steady-state power dissipation of the SMCJ48CA at room temperature?
The SMCJ48CA has a steady-state power dissipation (PD) rating of 5 W at TA = 25°C, derived from its thermal resistance (RθJA = 55°C/W) and maximum junction temperature (TJ = +150°C). In practice, this allows continuous operation at up to 5 W only with adequate copper area and airflow; typical derating curves show usable PD drops to ~2.5 W at 75°C ambient. This rating applies only to DC or low-frequency leakage conditions - not to transient events, where 1500W peak power is permitted for ≤1ms.
How does the SMCJ48CA compare to the SMCJ48A in terms of electrical performance?
The SMCJ48CA is the bidirectional version, while SMCJ48A is unidirectional. Both share identical VWM (48 V), VBR (53.3–58.9 V), and VC (77.4 V) ratings, but the SMCJ48CA clamps equally in both directions, whereas SMCJ48A only clamps reverse-biased transients and conducts forward current like a standard diode. This makes SMCJ48CA suitable for AC-coupled or floating nodes, while SMCJ48A is reserved for DC rails with defined polarity. Layout and schematic symbols differ accordingly.
SMCJ48CA 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:
- -
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ48CA FAQ
1.How can I place an order for SMCJ48CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ48CA 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 SMCJ48CA reliable?
The price and inventory of SMCJ48CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ48CA is usually 5 days.
3.What payment methods are accepted for SMCJ48CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ48CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ48CA?
SMCJ48CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ48CA 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 SMCJ48CA?
For technical support, including SMCJ48CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ48CA requirements.
6.How does Aetrix verify that SMCJ48CA is sourced from the original manufacturer or authorized distributors?
All SMCJ48CA 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 SMCJ48CA meets industry standards.
7.What is the process for return or replacement of SMCJ48CA?
All SMCJ48CA units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ48CA, 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 SMCJ48CA part is unused and in its original packaging.
Return procedure for SMCJ48CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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