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Taiwan Semiconductor Corporation SMCJ48CAH
- Part No.:
- SMCJ48CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ48CAH.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,416
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Product details
Overview
SMCJ48CAH 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 to protect automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ48CAH datasheet, SMCJ48CAH pinout, SMCJ48CAH application, or SMCJ48CAH equivalent, this device is selected for high-energy ESD and load-dump immunity in 48V battery systems, telecom DC feeds, and industrial PLC I/O modules where AEC-Q101 qualification, <1ps response time, and <1µA leakage above 10V are critical design requirements.
Technical Context
The SMCJ48CAH is a bipolar (bidirectional) TVS diode built on a glass-passivated junction, enabling symmetrical clamping in both polarities without external polarity constraints. Its thermal design supports 150°C max junction temperature and features RθJA = 55°C/W and RθJC = 10°C/W for effective heat dissipation in high-density PCB layouts.
It meets ISO 7637-2 test pulses for automotive electronics and delivers sub-1ps response from 0V to VBR(min), ensuring protection before sensitive downstream circuitry experiences overvoltage stress. The device operates across –55°C to +150°C and complies with J-STD-020 Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC bias margin for 48V nominal systems. |
| VBR min/max | 53.3 V / 58.9 V @ 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on within 10% tolerance of rated voltage. |
| VC @ IPPM | 77.4 V @ 20 A - Clamped voltage during 10/1000 µs surge; limits downstream voltage stress to ≤77.4 V under full-rated transient. |
| PPK | 1500 W - Peak pulse power handling per 1 ms waveform; enables robust immunity against high-energy load dump events. |
| IR @ VWM | <1 µA - Reverse leakage at 48 V; minimizes standby power loss and avoids false triggering in low-power monitoring circuits. |
| TJ max | +150 °C - Maximum junction temperature rating; supports operation in under-hood automotive and industrial ambient environments. |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 2.54 mm lead pitch; compatible with automated placement and reflow soldering per J-STD-002. |
Pinout & Package
DO-214AB (SMC) package: molded plastic case meeting UL 94V-0 flammability rating; matte tin-plated leads; polarity indicated by cathode band (not functional in bidirectional configuration).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (Bidirectional) | Common terminal pair | Electrically symmetric - either terminal serves as anode or cathode depending on transient polarity; no orientation required during placement. |
| Cathode Band Marking | Physical polarity indicator | Present on package but non-functional for SMCJ48CAH; retained for manufacturing consistency with unidirectional variants. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for under-hood and chassis-mounted applications. |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal stress and humidity exposure versus epoxy-passivated alternatives. |
| ISO 7637-2 compliance | Tested to Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) - covers full automotive transient immunity scope. |
| Fast response time | <1 ps from 0 V to VBR(min) - activates before most microcontrollers or analog front-ends can be damaged by fast-rising ESD or lightning-induced surges. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive - meets environmental compliance requirements for global OEM supply chains. |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 48V battery-fed ECUs, gate drivers, and sensor interfaces from load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary clamping element placed directly at connector entry point to shunt >100A transients before reaching downstream regulators and CAN transceivers. Use Value: Limits clamped voltage to 77.4 V during 20A surge, preventing damage to 60V-rated MOSFETs and 5V/3.3V LDOs in adjacent circuitry. | Use Scenario: Safeguarding digital input/output terminals of programmable logic controllers against field-wiring induced surges and ground bounce. IC Role / Device Role / Timing Role: Bidirectional transient suppressor mounted on PCB edge near terminal blocks to absorb ±1kV EFT and 10/1000 µs lightning surges. Use Value: Sub-1ps response ensures clamping occurs before 10 ns rise-time transients propagate into FPGA or microcontroller GPIO pins. |
| Telecom DC Power Feeds | Renewable Energy Monitoring |
Use Scenario: Securing -48V DC power inputs of base station radios and optical line terminals against AC-line coupled surges and lightning induction. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of DC-DC converters and hot-swap controllers to maintain system uptime during grid disturbances. Use Value: 1500W peak power rating sustains multiple 10/1000 µs surges without degradation, supporting Telcordia GR-1089-CORE compliance. | Use Scenario: Shielding voltage/current sensing circuits in solar charge controllers and battery management systems from PV array switching transients. IC Role / Device Role / Timing Role: Bidirectional clamp protecting precision ADC inputs and shunt amplifier stages from common-mode transients generated by MPPT switching. Use Value: <1 µA leakage at 48V prevents measurement offset errors in µA-level current sensing paths while maintaining fast transient suppression. |
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 | 600W peak power rating; same VWM/VBR/VC specs but lower PPK; SMB package (smaller footprint, higher RθJA). | Lower energy handling limits suitability to sub-10A surge environments; not recommended for ISO 7637-2 Pulse 5a (load dump). | Select SMBJ48CA only when board space is constrained and surge threat level is limited to IEC 61000-4-5 Level 3 (4kV) or lower. |
| 1.5KE48CA | Through-hole TO-204AA (DO-201AE) package; 1500W rating; identical electrical specs but slower response (~1ns) and no AEC-Q101 qualification. | Lacks automotive qualification and surface-mount compatibility; requires wave soldering and larger PCB real estate. | Choose 1.5KE48CA only for legacy through-hole designs or cost-sensitive industrial applications where AEC-Q101 is not mandated. |
Compared with SMBJ48CA and 1.5KE48CA, the SMCJ48CAH provides superior surge robustness in compact SMT form factor with automotive-grade reliability - making it the optimal choice for new 48V automotive and high-reliability industrial designs requiring validated ISO 7637-2 immunity.
Availability
SMCJ48CAH is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC I/O protection, and telecom DC power feed applications requiring stable component supply, AEC-Q101 compliance, and 1500W transient immunity.
Supply support for SMCJ48CAH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs - headquartered in Hsinchu, Taiwan.
The SMCJ series is part of TSC's AEC-Q101-qualified transient suppression portfolio, engineered specifically for automotive and industrial systems demanding high-energy clamping, fast response, and long-term reliability under thermal and mechanical stress.
FAQ
What does the "CAH" suffix indicate in SMCJ48CAH?
The "CAH" suffix in SMCJ48CAH denotes a bidirectional (C) TVS diode in the high-reliability AEC-Q101-qualified (A) SMCJ-H series (H). It confirms symmetrical clamping behavior, glass passivation, and automotive-grade qualification - distinguishing it from unidirectional "H" or non-automotive "AH" variants. The SMCJ48CAH is fully specified for operation in both polarities without polarity-dependent performance shifts.
Does SMCJ48CAH meet ISO 7637-2 Pulse 5a (load dump) requirements?
The SMCJ48CAH is rated for ISO 7637-2 Pulses 1, 2a, 2b, 3a, and 3b per official documentation, but Pulse 5a (load dump) requires higher energy handling beyond its 1500W rating. While it may survive single-event load dump transients depending on circuit impedance, TSC does not specify SMCJ48CAH for Pulse 5a compliance. For guaranteed load dump protection, use dedicated load dump suppressors or multi-stage protection with SMCJ48CAH as secondary clamp.
What is the maximum clamping voltage of SMCJ48CAH at 10A peak impulse current?
The datasheet specifies VC = 77.4 V at IPPM = 20 A for SMCJ48CAH. At 10 A, clamping voltage is lower - typical curves show ~65–68 V. However, no guaranteed maximum value is published for 10 A; design margins must rely on the 20 A spec (77.4 V) or empirical testing with the 10/1000 µs waveform. Always verify with actual surge testing in the target application.
Can SMCJ48CAH replace unidirectional SMCJ48AH in existing designs?
Yes, SMCJ48CAH can replace SMCJ48AH in most cases because both share identical VWM (48 V), VBR (53.3–58.9 V), and VC (77.4 V @ 20 A) ratings. However, the CAH variant is bidirectional and lacks functional polarity - so it eliminates orientation concerns but may exhibit slightly higher leakage in some bias conditions. No PCB changes are needed, but confirm system-level polarity tolerance before substitution.
Is SMCJ48CAH compliant with J-STD-020 moisture sensitivity level 1?
Yes, SMCJ48CAH is rated at Moisture Sensitivity Level (MSL) 1 per J-STD-020 - meaning it has unlimited floor life and requires no dry-pack or baking prior to reflow soldering. This simplifies manufacturing logistics and supports standard SMT assembly processes without special handling, unlike MSL 2a or higher components that demand strict humidity control.
SMCJ48CAH 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:
- 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)
SMCJ48CAH FAQ
1.How can I place an order for SMCJ48CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ48CAH 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 SMCJ48CAH reliable?
The price and inventory of SMCJ48CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ48CAH is usually 5 days.
3.What payment methods are accepted for SMCJ48CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ48CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ48CAH?
SMCJ48CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ48CAH 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 SMCJ48CAH?
For technical support, including SMCJ48CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ48CAH requirements.
6.How does Aetrix verify that SMCJ48CAH is sourced from the original manufacturer or authorized distributors?
All SMCJ48CAH 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 SMCJ48CAH meets industry standards.
7.What is the process for return or replacement of SMCJ48CAH?
All SMCJ48CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ48CAH, 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 SMCJ48CAH part is unused and in its original packaging.
Return procedure for SMCJ48CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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