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Taiwan Semiconductor Corporation SMCJ48H
- Part No.:
- SMCJ48H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ48H.pdf
- Description:
- 1500W, 59.2V, 10%, UNIDIRECTIONA
- Quantity:
- Payment:
- Shipping:
Inventory:5,280
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Product details
Overview
SMCJ48H 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), 53.3–65.1V breakdown voltage (VBR), and 85.5V maximum clamping voltage (VC) at 18A peak pulse current - designed for automotive power line surge protection per ISO 7637-2 Pulse 1/2a/2b/3a/3b.
For engineers reviewing the SMCJ48H datasheet, SMCJ48H pinout, SMCJ48H application, or SMCJ48H equivalent, this device supports high-reliability ESD and load-switch transient suppression in AEC-Q101-compliant automotive ECUs, industrial PLC I/O modules, and telecom DC power inputs where fast response (<1.0 ps), low leakage (<1 µA @ 48V), and robust 150°C junction operation are required.
Technical Context
The SMCJ48H employs a glass-passivated silicon junction optimized for unidirectional transient clamping, with thermal resistance of 55°C/W (junction-to-ambient) and 10°C/W (junction-to-case), enabling sustained 5W steady-state dissipation. Its clamping behavior follows the 10/1000µs standard waveform per R.E.A., delivering predictable voltage limiting under repetitive or single-event surges.
Designed for automated SMT placement, the device features matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance. Polarity is marked by cathode band; moisture sensitivity level is J-STD-020 Level 1 - eliminating bake requirements prior to reflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 53.3 V / 65.1 V @ 1 mA - Verified breakdown threshold range ensuring reliable turn-on margin above VWM |
| VC @ IPPM | 85.5 V @ 18 A - Clamped voltage during 10/1000µs surge, limiting downstream IC stress |
| PPK | 1500 W - Peak pulse power handling capability per single 1ms transient |
| IR @ VWM | <1 µA - Negligible leakage current preserving system standby power integrity |
| TJ max | +150 °C - Extended junction temperature rating supporting under-hood automotive deployment |
| Package | DO-214AB (SMC) - Industry-standard surface-mount outline with 0.210g mass and UL 94V-0 molding compound |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with coplanar matte tin-plated leads; cathode indicated by band marking; polarity-critical for unidirectional operation; weight ≈ 0.210 g; meets J-STD-020 Level 1 moisture sensitivity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connected to lower-potential side (e.g., ground or return) in unidirectional configuration |
| Cathode | Clamping reference node | Marked terminal connected to protected line (e.g., 48V rail); conducts during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Glass passivated junction | Enhanced long-term stability and reduced parameter drift under thermal and humidity stress |
| ISO 7637-2 compliance | Proven immunity to standardized automotive transients (Pulse 1, 2a, 2b, 3a, 3b) without derating |
| Fast response time | <1.0 ps rise from 0 V to VBR min - limits voltage overshoot before protection engages |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Automotive Power Distribution Module | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protecting 48V battery-fed control logic from load dump and alternator switching transients in commercial vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 48V supply rail and ground to clamp surges before they reach MCU power pins. Use Value: Limits clamped voltage to 85.5V during 18A transients, preventing damage to 100V-rated input regulators and maintaining functional safety integrity. | Use Scenario: Safeguarding 24/48V digital input isolation barriers against field-wiring induced surges in factory automation systems. IC Role / Device Role / Timing Role: Primary front-end transient suppressor on channel-level input terminals, upstream of optocoupler or digital isolator. Use Value: With <1 µA leakage at 48V, avoids false triggering of high-impedance sensing circuits while surviving repeated 1500W pulses. |
| Telecom DC Power Feeder | EV Charging Station Control Board |
Use Scenario: Suppressing lightning-induced surges on -48V DC distribution lines feeding base station radios and remote radio units. IC Role / Device Role / Timing Role: Bidirectional-capable variant not used; SMCJ48H deployed as unidirectional clamp on negative rail relative to chassis ground. Use Value: 55°C/W RθJA enables natural convection cooling on PCBs without heatsinks, reducing BOM cost in space-constrained telecom enclosures. | Use Scenario: Guarding microcontroller I/O and CAN transceiver power rails against coupling from high-current AC/DC converter switching noise. IC Role / Device Role / Timing Role: Secondary-level TVS on auxiliary 48V control bus, complementing primary MOV-based front-end protection. Use Value: AEC-Q101 qualification ensures suitability for automotive-grade charging infrastructure environments with extended temperature and vibration requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ48A | Same DO-214AC (SMA) package; 48V VWM; 53.3–64.8V VBR; 77.4V VC @ 19.4A; 400W PPK (lower) | Lower peak power rating limits use to lighter-duty transients; not AEC-Q101 qualified | Select when cost sensitivity outweighs automotive qualification and 1500W surge requirement |
| ON Semiconductor 1.5SMC48A | DO-214AB (SMC) package; 48V VWM; 53.3–64.8V VBR; 77.4V VC @ 19.4A; 1500W PPK; AEC-Q101 qualified | Identical electrical specs and qualification; minor differences in thermal resistance (RθJA = 50°C/W vs. 55°C/W) | Drop-in alternative with marginally better thermal performance; verify marking and tape/reel packaging compatibility |
Compared with SMAJ48A and 1.5SMC48A, the SMCJ48H offers identical 1500W surge rating and AEC-Q101 compliance but uses Taiwan Semiconductor's glass-passivated junction for enhanced long-term parameter stability - critical in high-reliability automotive and industrial deployments where parametric drift must be minimized over 10+ year lifetimes.
Availability
SMCJ48H is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC I/O protection, and telecom DC power feeder applications requiring stable component supply across multi-year production cycles.
Supply support for SMCJ48H 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, rectifiers, and TVS diodes for automotive and industrial markets.
The SMCJ series was developed specifically for AEC-Q101-compliant transient suppression in harsh-environment 12V–48V automotive and industrial power systems, emphasizing robust clamping consistency, low leakage, and automated assembly compatibility.
FAQ
What is the clamping voltage of the SMCJ48H under a standard 10/1000µs surge?
The SMCJ48H has a maximum clamping voltage (VC) of 85.5 V at 18 A peak pulse current (IPPM), measured using the 10/1000µs waveform defined by R.E.A. This value ensures downstream components see limited overvoltage during standardized transients - critical for protecting 100V-rated regulators and interface ICs in 48V systems. The SMCJ48H maintains this clamping performance across its full operating temperature range (-55°C to +150°C).
Is the SMCJ48H suitable for bidirectional transient suppression?
No - the SMCJ48H is a unidirectional TVS diode, intended for use on polarized DC lines such as 48V supply rails referenced to ground. For bidirectional applications (e.g., AC signal lines or differential buses), Taiwan Semiconductor specifies variants with CH or CAH suffixes (e.g., SMCJ48CH). Using the SMCJ48H in reverse-biased mode beyond its specified VWM risks permanent junction degradation. Always confirm polarity alignment during layout.
Does the SMCJ48H require pre-reflow baking before SMT assembly?
No - the SMCJ48H is rated at Moisture Sensitivity Level (MSL) 1 per J-STD-020, meaning it can be stored indefinitely at ambient conditions (≤30°C / 60% RH) without baking. Its DO-214AB (SMC) package uses moisture-resistant molding compound, eliminating the need for dry-packaging or oven preconditioning prior to reflow soldering - simplifying manufacturing logistics and reducing process risk.
How does the SMCJ48H compare to the SMCJ48AH variant?
The SMCJ48AH differs from the SMCJ48H in tighter breakdown voltage tolerance: SMCJ48H specifies VBR = 53.3–65.1 V, while SMCJ48AH narrows it to 53.3–58.9 V. Both share identical VWM (48 V), VC (77.4 V), and PPK (1500 W). The SMCJ48AH is preferred where precise clamping onset is critical - e.g., in systems with narrow voltage margins between VWM and downstream IC absolute maximum ratings. The SMCJ48H remains optimal for general-purpose surge suppression where broader VBR spread is acceptable.
What is the forward voltage drop of the SMCJ48H during surge conduction?
The SMCJ48H exhibits a forward voltage (VF) of 3.5 V at 100 A forward surge current, consistent with the SMCJ5.0H–SMCJ90H family grouping. This low VF minimizes power dissipation during high-current unidirectional clamping events and reduces thermal stress on the junction. Note that VF applies only during forward conduction (anode positive relative to cathode); reverse-biased operation follows the specified clamping curve up to VC = 85.5 V.
SMCJ48H 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:
- 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)
SMCJ48H FAQ
1.How can I place an order for SMCJ48H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ48H 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 SMCJ48H reliable?
The price and inventory of SMCJ48H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ48H is usually 5 days.
3.What payment methods are accepted for SMCJ48H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ48H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ48H?
SMCJ48H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ48H 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 SMCJ48H?
For technical support, including SMCJ48H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ48H requirements.
6.How does Aetrix verify that SMCJ48H is sourced from the original manufacturer or authorized distributors?
All SMCJ48H 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 SMCJ48H meets industry standards.
7.What is the process for return or replacement of SMCJ48H?
All SMCJ48H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ48H, 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 SMCJ48H part is unused and in its original packaging.
Return procedure for SMCJ48H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ48H Tags
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