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Taiwan Semiconductor Corporation SMCJ48CH
- Part No.:
- SMCJ48CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ48CH.pdf
- Description:
- 1500W, 59.3V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,029
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Product details
Overview
SMCJ48CH from Taiwan Semiconductor is a bidirectional 1500W transient voltage suppressor (TVS) in DO-214AB (SMC) package, with 48V working stand-off voltage (VWM), 53.3–65.1V breakdown voltage (VBR), and 85.5V maximum clamping voltage (VC) at 18A peak pulse current - designed for automotive-grade ESD and load-dump protection in power supply rails and CAN/LIN interfaces.
For engineers reviewing the SMCJ48CH datasheet, SMCJ48CH pinout, SMCJ48CH application, or SMCJ48CH equivalent, this device delivers AEC-Q101 qualification, sub-1ps response time, <1µA leakage above 10V, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and bidirectional surge immunity - critical for robust front-end protection in automotive ECUs and industrial controllers.
Technical Context
The SMCJ48CH is a glass-passivated, single-die bidirectional TVS diode optimized for high-energy transients. Its junction-to-case thermal resistance (RθJC) is 10°C/W, enabling effective heat dissipation during 1ms 1500W pulses, while its unidirectional forward voltage (VF = 3.5V @ 100A) applies only to unidirectional variants - not applicable here due to CH suffix indicating bidirectional configuration.
Electrical characteristics are symmetric in both directions per datasheet Note 2. It meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity, supporting reflow-compatible automated placement without derating concerns in standard SMT processes.
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 / 65.1 V @ IT = 1 mA - ensures reliable turn-on across process variation and temperature |
| VC @ IPPM | 85.5 V @ 18 A - limits downstream voltage stress during ISO 7637-2 Pulse 2b (load dump) |
| PPK | 1500 W - handles 1ms transient energy up to 1.5J without failure |
| IR @ VWM | <1 µA - negligible standby leakage, preserving low-power system integrity |
| TJ max | +150 °C - supports under-hood automotive operation with full derating margin |
| Package | DO-214AB (SMC) - industry-standard surface-mount outline with 55°C/W RθJA |
Pinout & Package
DO-214AB (SMC) package: molded plastic case meeting UL 94V-0, matte tin-plated leads, polarity indicated by cathode band (not functional in bidirectional SMCJ48CH; marking serves as orientation reference only).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bidirectional) | Surge current path (symmetrical) | No functional polarity - terminals interchangeable; clamps equally on positive or negative transients |
| Cathode band marking | Physical orientation indicator | Provides visual alignment reference during placement; no electrical significance for CH-type devices |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, HTRB, and ESD testing per stress test plan |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect/load dump), and Pulse 3a/3b (line impedance transients) |
| Glass passivated junction | Enhances long-term reliability and stability of VBR under repeated surge stress |
| Fast response time <1 ps | Clamps before sensitive downstream ICs experience overvoltage - critical for protecting CAN transceivers and microcontrollers |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protecting 12V supply rail and LIN bus lines against battery reverse connection, jump-start surges, and alternator load dump. IC Role / Device Role / Timing Role: Primary bidirectional clamping element placed directly at connector entry point before LDOs and microcontrollers. Use Value: Limits transient voltage to ≤85.5V, preventing latch-up or damage to 3.3V/5V logic powered from same rail. | Use Scenario: Safeguarding 24V digital input channels from field-wiring induced surges (e.g., relay coil flyback, lightning-induced coupling). IC Role / Device Role / Timing Role: Front-end transient absorber mounted adjacent to terminal block, shunting energy before optocoupler or Schmitt trigger input stage. Use Value: Withstands ≥18A 1ms pulses without degradation, ensuring >100,000 surge cycles in factory automation environments. |
| Automotive Infotainment Head Unit | Telecom Power Interface Board |
Use Scenario: Shielding USB-C PD negotiation lines and display data buses from ESD events during hot-plug and panel handling. IC Role / Device Role / Timing Role: Secondary-level protection aligned with IEC 61000-4-2 Level 4 (±15kV air/±8kV contact) requirements. Use Value: Sub-1µA leakage preserves signal integrity on high-impedance data lines; fast clamping avoids data corruption during ESD discharge. | Use Scenario: Guarding -48V telecom power feed against lightning-induced longitudinal surges entering via copper pairs. IC Role / Device Role / Timing Role: First-stage protector in hybrid protection circuit with gas discharge tube (GDT) and PTC, absorbing initial high-energy spike. Use Value: 1500W peak power rating enables coordination with upstream GDT to handle multi-kA threats while limiting let-through voltage to safe levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48CA | 600W rating (vs. 1500W); SMB package (smaller footprint, higher RθJA = 75°C/W) | Limited to lower-energy transients (e.g., IEC 61000-4-5 0.5kV); unsuitable for ISO 7637-2 Pulse 2b | Select when space-constrained and surge threat level is below 600W - verify clamping voltage (VC = 77.4V) remains within system margin. |
| TPSMD48C | Same 1500W rating and DO-214AB package; tighter VBR tolerance (53.3–58.9V vs. 53.3–65.1V) | Identical ISO 7637-2 coverage; slightly lower VC (82.5V) improves downstream margin | Prefer for new designs requiring tighter parametric control and enhanced clamping consistency across temperature and lot variation. |
Compared with SMBJ48CA and TPSMD48C, the SMCJ48CH provides the highest surge energy handling in its package class, broader VBR range for process flexibility, and explicit AEC-Q101 validation - making it the preferred choice for automotive power rail protection where reliability under worst-case transients is non-negotiable.
Availability
SMCJ48CH is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, telecom power interfaces, and infotainment systems requiring stable component supply with full AEC-Q101 traceability and extended lifecycle support.
Supply support for SMCJ48CH 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 components.
The SMCJ series was developed specifically for high-reliability automotive and industrial transient suppression, emphasizing AEC-Q101 compliance, ISO 7637-2 immunity, and robust thermal performance in surface-mount packages.
FAQ
What does the "CH" suffix indicate in SMCJ48CH?
The "CH" suffix in SMCJ48CH denotes a bidirectional configuration with symmetrical clamping behavior in both polarities. Unlike unidirectional "H" variants, SMCJ48CH has no anode/cathode distinction - both terminals function identically during positive or negative transients. This is confirmed in the datasheet's "Devices for bipolar applications" section and electrical specifications table, where all parameters apply in both directions.
Is SMCJ48CH suitable for ISO 7637-2 Pulse 2b (load dump) protection?
Yes, SMCJ48CH is explicitly rated for ISO 7637-2 Pulse 2b. Its 1500W peak power rating, 85.5V clamping voltage at 18A, and 1ms pulse capability meet the energy and voltage constraints of this 12V automotive load-dump waveform. The device's RθJC of 10°C/W and TJ max of +150°C ensure thermal survivability during repeated events without derating beyond ambient limits.
What is the maximum clamping voltage (VC) for SMCJ48CH, and under what test condition?
The maximum clamping voltage (VC) for SMCJ48CH is 85.5V, measured at a peak pulse current (IPPM) of 18A with a 10/1000μs waveform per Figure 5 in the datasheet. This value represents the worst-case voltage seen by downstream circuitry during a standardized surge event and is guaranteed across temperature and process variation per the "Maximum clamping voltage (Note 2)" row in the Electrical Specifications table.
Does SMCJ48CH require derating at elevated ambient temperatures?
Yes, SMCJ48CH must be derated above TA = 25°C per Figure 2 (Pulse Derating Curve). At 85°C ambient, its 1500W peak power rating reduces to approximately 900W - corresponding to ~10.8A IPPM at the same VC. This derating is essential for sustained reliability in under-hood applications and is defined by the RθJA of 55°C/W and thermal limits in the Absolute Maximum Ratings table.
How does SMCJ48CH differ from SMCJ48AH in terms of breakdown voltage?
SMCJ48CH has a VBR range of 53.3–65.1V, while SMCJ48AH specifies 53.3–58.9V. The wider tolerance of SMCJ48CH reflects its bidirectional design and broader process window, whereas SMCJ48AH's tighter upper limit supports applications needing stricter clamping predictability. Both share identical VWM (48V), VC (85.5V/77.4V), and packaging - differences are confined to VBR distribution, not functional compatibility.
SMCJ48CH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- 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:
- 85.5V
- Current - Peak Pulse (10/1000µs):
- 18A
- 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)
SMCJ48CH FAQ
1.How can I place an order for SMCJ48CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ48CH 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 SMCJ48CH reliable?
The price and inventory of SMCJ48CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ48CH is usually 5 days.
3.What payment methods are accepted for SMCJ48CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ48CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ48CH?
SMCJ48CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ48CH 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 SMCJ48CH?
For technical support, including SMCJ48CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ48CH requirements.
6.How does Aetrix verify that SMCJ48CH is sourced from the original manufacturer or authorized distributors?
All SMCJ48CH 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 SMCJ48CH meets industry standards.
7.What is the process for return or replacement of SMCJ48CH?
All SMCJ48CH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ48CH, 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 SMCJ48CH part is unused and in its original packaging.
Return procedure for SMCJ48CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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