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Taiwan Semiconductor Corporation SMCJ48
- Part No.:
- SMCJ48
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ48.pdf
- Description:
- 1500W, 59.2V, 10%, UNIDIRECTIONA
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SMCJ48 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 load-dump and inductive switching protection in power supply rails.
For engineers reviewing the SMCJ48 datasheet, SMCJ48 pinout, SMCJ48 application, or SMCJ48 equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 2b/5a, junction temperature derating above 25°C, unidirectional polarity marking, and compatibility with automated SMT placement on 1.6mm-thick PCBs.
Technical Context
The SMCJ48 operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (53.3–65.1V at 1mA test current), clamping transients to ≤85.5V within <1.0ps response time. It sustains 1500W peak pulse power (tp = 1ms, 10/1000μs waveform) and handles up to 200A non-repetitive forward surge (IFSM).
Thermal design relies on RθJA = 55°C/W and RθJC = 10°C/W, enabling operation from –55°C to +150°C junction temperature. Its glass-passivated junction and matte tin-plated leads meet J-STD-002 solderability and JESD 201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 48V systems. |
| VBR min/max | 53.3 / 65.1 V @ 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 85.5 V @ 18 A - Clamped voltage during 10/1000μs surge; limits downstream IC stress below 90V absolute maximum ratings. |
| PPK | 1500 W - Peak pulse power handling per single 1ms event; supports ISO 7637-2 Pulse 5a (load dump) immunity. |
| IR @ VWM | <1 μA - Reverse leakage at 48V; negligible power loss and signal integrity impact in standby or low-power modes. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments with thermal derating. |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with cathode band marking; compatible with IPC-7351B footprint and reflow profiles. |
Pinout & Package
DO-214AB (SMC) package: molded epoxy case meeting UL 94V-0, matte tin-plated leads, polarity indicated by cathode band (unidirectional only), weight ≈0.210g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or low-voltage return path; forms clamping loop with cathode on protected line. |
| Cathode | Protected line input | Connected to 48V rail or signal line; conducts avalanche current to anode during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated for Pulse 1, 2a, 2b, 3a, and 3b - enables direct integration into automotive ECU power inputs without external filtering. |
| Fast response time | <1.0 ps from 0 V to VBR min - prevents sub-nanosecond ESD or EFT transients from reaching sensitive analog or digital circuitry. |
| Glass passivated junction | Enhanced reliability and stable VBR over lifetime - eliminates parameter drift due to moisture ingress or thermal cycling. |
| Moisture sensitivity level | MSL Level 1 (per J-STD-020) - no floor life limitation or bake requirement before reflow; simplifies SMT manufacturing flow. |
| RoHS & halogen-free | Compliant with IEC 61249-2-21 - meets global environmental regulations for automotive and industrial end equipment. |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: 48V battery-fed ADAS camera module exposed to load-dump transients during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 48V rail and ground, clamping surges before they reach DC-DC converter input. Use Value: Limits voltage to ≤85.5V during 1500W pulses, preventing damage to 100V-rated input MOSFETs and maintaining system uptime. |
Use Scenario: 24/48V digital input card in factory automation PLC subjected to inductive kickback from solenoid coil switching. IC Role / Device Role / Timing Role: TVS mounted at terminal block entry point, shunting energy away from optocoupler input stage. Use Value: Sub-1ns response ensures clamping occurs before 100ns EFT bursts propagate into isolation barrier, preserving signal integrity. |
| LED Driver Overvoltage Suppression | Telecom Power Interface Protection |
Use Scenario: Constant-current LED driver board in streetlight fixture experiencing lightning-induced surges on AC/DC front-end. IC Role / Device Role / Timing Role: SMCJ48 installed across bulk capacitor input, absorbing residual transients after MOV-based primary suppression. Use Value: 85.5V clamping protects 100V-rated electrolytic capacitors and reduces need for oversized voltage margins. |
Use Scenario: 48V PoE-powered remote radio unit (RRU) interface exposed to induced surges on outdoor cabling. IC Role / Device Role / Timing Role: TVS placed on DC input side of PoE PD controller, upstream of DC-DC conversion stage. Use Value: 1500W rating withstands multiple ISO 7637-2 Pulse 2b events without degradation, extending field service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48A | Lower PPK (600W), smaller SMB package (DO-214AA), tighter VBR tolerance (53.3–58.9V) | Reduced surge capacity; suitable for lower-energy transients (e.g., ESD-only) but not load-dump duty cycles | Select SMCJ48 when 1500W peak power and DO-214AB mechanical robustness are required. |
| 1.5KE48A | Through-hole TO-218 package, same VWM/VBR/VC specs, higher thermal mass but incompatible with SMT lines | Requires manual or wave-solder assembly; unsuitable for high-density or automated production | Choose SMCJ48 for surface-mount scalability, reflow compatibility, and space-constrained designs. |
Compared with SMBJ48A and 1.5KE48A, the SMCJ48 delivers 2.5× higher surge power in an SMT-optimized package while maintaining identical electrical clamping behavior - making it the preferred choice for automotive and industrial 48V systems requiring both performance and manufacturability.
Availability
SMCJ48 is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, LED drivers, and telecom power interfaces requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMCJ48 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 Taiwanese semiconductor manufacturer specializing in discrete power devices, including TVS diodes, rectifiers, and MOSFETs, with ISO/TS 16949 certification.
The SMCJ series was developed specifically for high-energy transient suppression in automotive and industrial 12V–170V systems, emphasizing rugged packaging, ISO 7637-2 compliance, and automated assembly readiness.
FAQ
What is the maximum clamping voltage of the SMCJ48 under standard test conditions?
The SMCJ48 has a maximum clamping voltage (VC) of 85.5 V when subjected to a 10/1000 μs surge waveform at 18 A peak impulse current (IPPM), per the manufacturer's electrical specifications table. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuits during transient events. The SMCJ48 maintains this clamping performance consistently across its rated operating temperature range.
Is the SMCJ48 suitable for bidirectional transient protection?
No, the SMCJ48 is a unidirectional TVS diode intended for DC rail protection where polarity is fixed. For bidirectional applications, the SMCJ48CA variant must be used - it features symmetrical breakdown in both directions and carries a "CA" suffix. The SMCJ48 itself has a cathode band marking and conducts only in reverse bias, making it incompatible with AC or floating-signal protection without additional circuitry.
Does the SMCJ48 meet automotive industry surge immunity standards?
Yes, the SMCJ48 meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), Pulse 3a (capacitive coupling), and Pulse 3b (inductive coupling). Its 1500W peak power rating and fast <1.0 ps response ensure compliance with these standardized vehicle-level transient tests without supplemental components.
What is the thermal resistance from junction to ambient for the SMCJ48?
The SMCJ48 has a typical junction-to-ambient thermal resistance (RθJA) of 55°C/W under standard JEDEC test conditions (single device on 1-inch² FR-4 board with 2 oz copper). This value assumes no additional copper pour or heatsinking; actual board layout significantly impacts thermal performance. For sustained surge duty, designers should verify junction temperature using RθJA, power dissipation, and ambient conditions to stay within the +150°C TJ max limit.
Can the SMCJ48 be used in RoHS-compliant and halogen-free assemblies?
Yes, the SMCJ48 is certified RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound contains no brominated flame retardants, and lead content is below 1000 ppm. The matte tin-plated leads meet J-STD-002 solderability requirements, and the entire construction supports lead-free reflow profiles up to 260°C peak temperature - making it fully compatible with modern green electronics manufacturing.
SMCJ48 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ48 FAQ
1.How can I place an order for SMCJ48 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ48 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 SMCJ48 reliable?
The price and inventory of SMCJ48 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ48 is usually 5 days.
3.What payment methods are accepted for SMCJ48?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ48 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ48?
SMCJ48 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ48 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 SMCJ48?
For technical support, including SMCJ48 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ48 requirements.
6.How does Aetrix verify that SMCJ48 is sourced from the original manufacturer or authorized distributors?
All SMCJ48 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 SMCJ48 meets industry standards.
7.What is the process for return or replacement of SMCJ48?
All SMCJ48 units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ48, 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 SMCJ48 part is unused and in its original packaging.
Return procedure for SMCJ48:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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