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Taiwan Semiconductor Corporation SMCJ48AH
- Part No.:
- SMCJ48AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ48AH.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,630
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Product details
Overview
SMCJ48AH 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 to protect automotive power rails and industrial I/O interfaces against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ48AH datasheet, SMCJ48AH pinout, SMCJ48AH application, or SMCJ48AH equivalent, this part delivers AEC-Q101 qualification, sub-1ps response time, <1µA reverse leakage above 10V, glass-passivated junction reliability, and UL 94V-0 molding - critical for ESD and load-switching surge immunity in high-reliability embedded systems.
Technical Context
The SMCJ48AH operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its VBR range (53.3–58.9V @ 1mA). It features a single-die DO-214AB construction with cathode band polarity marking, rated for 1500W peak pulse power (tp = 1ms) and 5W steady-state dissipation at 25°C.
Thermal performance is defined by RθJA = 55°C/W and RθJC = 10°C/W, enabling reliable operation up to TJ = +150°C. Its fast response (<1.0ps from 0V to VBR min) and low clamping ratio (VC/VBR ≈ 1.32) ensure minimal overvoltage exposure during transient events.
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 @ 1 mA - Confirmed avalanche onset range under standardized test conditions |
| VC @ IPPM | 77.4 V @ 20 A - Clamped voltage during 10/1000μs surge, limiting downstream stress |
| PPK | 1500 W - Peak pulse power handling per single 1ms transient per Fig.5 |
| IR @ VWM | <1 µA - Negligible leakage current at rated stand-off, minimizing standby power loss |
| TJ max | +150 °C - Maximum junction temperature supporting under-hood and industrial ambient operation |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 0.210g mass and J-STD-002 solderability |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, cathode band indicating terminal polarity, UL 94V-0 flammability rating, and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connected to lower-potential side (e.g., ground or return) in unidirectional configuration |
| Cathode | Avalanche clamping node | Connected to protected line (e.g., 48V rail); cathode band marks this terminal on body |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| ISO 7637-2 compliance | Guaranteed immunity to Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Glass passivated junction | Enhanced moisture resistance and long-term stability vs. epoxy-passivated alternatives |
| Fast response time | <1.0 ps rise-to-VBR enables clamping before sensitive ICs experience overvoltage damage |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital I/O |
|---|---|
Use Scenario: Protecting 48V battery-fed ECUs against load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 48V supply and ground, clamping surges before they reach DC-DC converters and microcontrollers. Use Value: Limits peak voltage to 77.4V during 20A transients, preventing latch-up or gate oxide rupture in downstream 60V-rated FETs and regulators. | Use Scenario: Shielding 24/48V digital input channels in programmable logic controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Standoff protection element mounted at connector entry point, shunting energy away from optocoupler inputs and signal conditioning circuitry. Use Value: Sub-1ps response ensures clamping occurs before transient propagates into isolation barrier, preserving signal integrity and system uptime. |
| Telecom Base Station Power | Renewable Energy Inverter Control |
Use Scenario: Safeguarding 48V telecom rectifier outputs and backplane supplies from lightning-induced surges on AC mains or external lines. IC Role / Device Role / Timing Role: Primary overvoltage clamp on distributed power bus, coordinated with upstream fuses and secondary filtering. Use Value: 1500W peak power rating handles multi-kA surge currents without thermal runaway, maintaining bus stability during grid disturbances. | Use Scenario: Protecting gate drivers and sensor interfaces in solar string inverters exposed to rapid PV array voltage transients during cloud-edge events. IC Role / Device Role / Timing Role: Secondary-level transient suppressor on auxiliary 48V control rail feeding isolated gate drivers and ADC references. Use Value: Low 1µA leakage avoids loading precision reference dividers; 77.4V clamping prevents false triggering of overvoltage lockout circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48A | 600W PPK rating, same VWM/VBR/VC but lower surge capacity (10A IPPM vs. 20A) | Lower-power I/O lines or space-constrained PCBs where 1500W headroom is unnecessary | Select SMBJ48A only if system-level surge testing confirms ≤600W requirement and layout allows smaller SMB package |
| SMCJ48A | Same 1500W rating and DO-214AB package, but non-AEC-Q101; higher IR (≤5µA vs. ≤1µA) | Industrial or consumer equipment not requiring automotive qualification or ultra-low leakage | Choose SMCJ48A when AEC-Q101 and sub-1µA leakage are not mandated, reducing cost without sacrificing clamping performance |
Compared with SMBJ48A and SMCJ48A, the SMCJ48AH provides certified automotive reliability, tighter leakage control, and identical mechanical footprint - making it the preferred choice for safety-critical 48V systems where transient margin and long-term stability are non-negotiable.
Availability
SMCJ48AH is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, and telecom power systems requiring stable component supply, full traceability, and long-lifecycle support.
Supply support for SMCJ48AH 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.
The SMCJ series was developed specifically for high-energy transient suppression in automotive and industrial environments, emphasizing AEC-Q101 compliance, ISO 7637-2 robustness, and thermally efficient DO-214AB packaging.
FAQ
What is the clamping voltage of the SMCJ48AH under standard test conditions?
The SMCJ48AH has a maximum clamping voltage (VC) of 77.4 V when subjected to a 10/1000 μs waveform peak pulse current (IPPM) of 20 A, measured at TA = 25°C. This value is guaranteed per the manufacturer's electrical specifications table and reflects worst-case voltage seen by protected circuitry during surge events.
Is the SMCJ48AH suitable for bidirectional transient protection?
No, the SMCJ48AH is a unidirectional TVS diode intended for DC line protection with defined polarity. For bidirectional applications, Taiwan Semiconductor specifies parts with "CH" or "CAH" suffixes (e.g., SMCJ48CH); the SMCJ48AH lacks symmetrical breakdown characteristics and must be installed with correct cathode orientation relative to the protected line.
Does the SMCJ48AH meet AEC-Q101 requirements for automotive use?
Yes, the SMCJ48AH is explicitly qualified to AEC-Q101 Rev D standards, covering stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD (HBM ≥ 8 kV, CDM ≥ 1 kV). This qualification is documented in the product family datasheet and confirmed in the FEATURES section of the official specification.
What is the maximum steady-state power dissipation for the SMCJ48AH?
The SMCJ48AH has a steady-state power dissipation (PD) rating of 5 W at TA = 25°C, derating linearly above that ambient temperature per the Pulse Derating Curve (Fig.2). This rating applies only to continuous DC or low-frequency reverse-bias conditions - not to transient events, which are governed by the 1500W PPK limit.
How does the SMCJ48AH differ from the SMCJ48A variant?
The SMCJ48AH differs from SMCJ48A in three key ways: it carries AEC-Q101 qualification, guarantees ≤1 µA reverse leakage (vs. ≤5 µA for SMCJ48A), and uses enhanced process controls for automotive-grade consistency. Both share identical VWM, VBR, VC, package, and 1500W PPK rating - but only SMCJ48AH meets full automotive reliability requirements.
SMCJ48AH 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 20A
- 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)
SMCJ48AH FAQ
1.How can I place an order for SMCJ48AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ48AH 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 SMCJ48AH reliable?
The price and inventory of SMCJ48AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ48AH is usually 5 days.
3.What payment methods are accepted for SMCJ48AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ48AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ48AH?
SMCJ48AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ48AH 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 SMCJ48AH?
For technical support, including SMCJ48AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ48AH requirements.
6.How does Aetrix verify that SMCJ48AH is sourced from the original manufacturer or authorized distributors?
All SMCJ48AH 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 SMCJ48AH meets industry standards.
7.What is the process for return or replacement of SMCJ48AH?
All SMCJ48AH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ48AH, 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 SMCJ48AH part is unused and in its original packaging.
Return procedure for SMCJ48AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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