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Taiwan Semiconductor Corporation SMCJ28C
- Part No.:
- SMCJ28C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28C.pdf
- Description:
- 1500W, 34.6V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:6,716
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Product details
Overview
SMCJ28C from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 28V working stand-off voltage (VWM), 31.1–38.0V breakdown voltage (VBR), and 50.0V maximum clamping voltage (VC) at 31A peak pulse current. It protects automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ28C datasheet, SMCJ28C pinout, SMCJ28C application, or SMCJ28C equivalent, this device delivers fast sub-1ps response, <1μA reverse leakage above 10V, and robust 150°C junction operation - critical for ESD and load-dump protection in automotive ECUs, LED drivers, and industrial PLC I/O modules.
Technical Context
The SMCJ28C is a bipolar TVS diode designed for symmetrical transient suppression in both directions, meeting ISO 7637-2 immunity requirements without polarity dependency. Its glass-passivated junction ensures stable VBR tolerance and low leakage, while the DO-214AB package supports automated placement and withstands 200A surge current (IFSM).
Thermal performance is defined by RθJA = 55°C/W and RθJC = 10°C/W, enabling reliable operation up to 150°C junction temperature. The 1ms 1500W peak power rating (PPK) is derated linearly above 25°C ambient per Fig.2, supporting sustained transient handling in high-temperature enclosures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 31.1 V / 38.0 V @ IT = 1 mA - Ensures consistent breakdown across production lots |
| VC @ IPPM | 50.0 V @ 31 A - Clamping voltage limits downstream IC stress during 10/1000μs transients |
| PPK | 1500 W - Peak pulse power capability for short-duration surges per Fig.5 waveform |
| IR @ VWM | <1 μA - Negligible leakage current preserves low-power system standby integrity |
| TJ max | +150 °C - Enables deployment in under-hood automotive or industrial motor-control environments |
Pinout & Package
DO-214AB (SMC) surface-mount package: molded epoxy case rated UL 94V-0, matte tin-plated leads, polarity indicated by cathode band (not applicable for bidirectional SMCJ28C - symmetric terminals).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | Either terminal serves as input/output - no polarity sensitivity; enables flexible PCB layout |
| Case (exposed metal pad) | Thermal and mechanical anchor | Provides primary heat dissipation path to PCB copper; requires thermal pad connection per JEDEC MO-213 |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Stable VBR tolerance (±5% typical) and low IR drift over temperature and lifetime |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (switching transients) |
| Sub-1ps response time | Clamps within 1 picosecond of transient onset - faster than most microcontroller I/O protection needs |
| Moisture sensitivity level 1 | No bake requirement before reflow - compatible with standard SMT assembly lines per J-STD-020 |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting 24V CAN bus power supply and microcontroller VDD rails from battery load-dump events in engine control units. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between power rail and ground, absorbing 1500W transients without failure. Use Value: Prevents latch-up or permanent damage to 3.3V/5V logic ICs during ISO 7637-2 Pulse 5a (load dump), maintaining system uptime. | Use Scenario: Safeguarding 24V digital input channels on programmable logic controller backplanes exposed to relay coil flyback. IC Role / Device Role / Timing Role: Primary transient shunt across input optocoupler terminals, clamping spikes before signal conditioning circuitry. Use Value: Eliminates false triggering and extends optocoupler lifetime by limiting voltage to ≤50V during 10/1000μs inductive surges. |
| LED Driver Output Protection | ESD-Sensitive Sensor Interface Protection |
Use Scenario: Shielding constant-current LED driver outputs from wiring harness transients in commercial lighting systems. IC Role / Device Role / Timing Role: Parallel-connected TVS at driver output node, conducting surge energy away from MOSFET gate drivers and current-sense amplifiers. Use Value: Maintains LED string reliability by suppressing >100V spikes to ≤50V, preventing gate oxide rupture in driver FETs. | Use Scenario: Protecting analog front-end inputs of temperature or pressure sensors connected to long cables in factory automation. IC Role / Device Role / Timing Role: First-line defense at connector entry point, diverting ESD (IEC 61000-4-2) and EFT (IEC 61000-4-4) energy before signal conditioning ICs. Use Value: Reduces sensor calibration drift and field failures by limiting transient-induced offset errors to <0.5% FS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28CA (Bourns) | Same DO-214AA package, 1000W PPK rating (vs. 1500W), VC = 45.4V @ 22A | Lower peak power margin; suitable only where transients are less severe or repetitive | Select SMBJ28CA if board space is constrained (smaller SMB package) and surge energy is ≤1000W |
| P6SMB28CA (Littelfuse) | DO-214AA package, 600W PPK, VC = 45.4V @ 13.3A, higher IR (≤5μA) | Limited to lower-energy transients; not recommended for ISO 7637-2 Pulse 5a | Choose P6SMB28CA for cost-sensitive consumer-grade designs with non-automotive transient profiles |
Compared with SMBJ28CA and P6SMB28CA, the SMCJ28C provides 50% higher peak power handling and tighter clamping consistency, making it the preferred choice for automotive and industrial applications requiring full ISO 7637-2 compliance and 1500W surge resilience.
Availability
SMCJ28C is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC I/O protection, LED driver output safeguarding, and sensor interface hardening requiring stable component supply and full traceability.
Supply support for SMCJ28C 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 for automotive, industrial, and computing markets.
The SMCJ series was engineered specifically for high-energy transient suppression in harsh environments, targeting ISO 7637-2-compliant automotive subsystems and industrial control equipment demanding 1500W surge capability and 150°C operation.
FAQ
What is the clamping voltage of SMCJ28C at its rated peak pulse current?
The SMCJ28C has a maximum clamping voltage (VC) of 50.0 V at 31 A peak impulse current (IPPM), measured under the 10/1000μs waveform per IEC 61000-4-5. This value ensures downstream components see no more than 50 V during worst-case transients, directly supporting 3.3V/5V/24V system voltage margins. The SMCJ28C maintains this clamping performance across its full operating temperature range.
Is SMCJ28C unidirectional or bidirectional, and how does that affect PCB layout?
The SMCJ28C is a bidirectional TVS diode, indicated by the "C" suffix, meaning it clamps symmetrically in both polarities with identical VBR and VC characteristics. Unlike unidirectional variants (e.g., SMCJ28A), it requires no orientation during placement - either terminal connects to the protected line, simplifying layout and eliminating polarity-check steps in automated assembly. The SMCJ28C's symmetry also avoids DC bias concerns in AC-coupled or floating signal paths.
Does SMCJ28C meet automotive transient immunity standards such as ISO 7637-2?
Yes, the SMCJ28C is explicitly rated to meet ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (switching noise) requirements. Its 1500W peak power rating, sub-1ps response, and 50.0V clamping voltage enable robust protection against these standardized waveforms without additional external circuitry. The SMCJ28C's qualification is documented in Taiwan Semiconductor's S2104 datasheet revision.
What is the maximum junction temperature and thermal resistance of SMCJ28C?
The SMCJ28C has a maximum junction temperature (TJ) of +150°C and thermal resistances of RθJA = 55°C/W (junction-to-ambient) and RθJC = 10°C/W (junction-to-case). These values assume proper PCB copper pour under the exposed pad per JEDEC MO-213 guidelines. At 25°C ambient, the SMCJ28C can sustain full 1500W pulses; derating begins linearly above that point per Fig.2 in the SMCJ28C datasheet.
How does the SMCJ28C compare to SMCJ28A in terms of electrical performance?
The SMCJ28C is bidirectional with symmetrical clamping in both directions, while the SMCJ28A is unidirectional and conducts only in reverse bias. The SMCJ28C has identical VWM (28 V), VBR (31.1–38.0 V), and VC (50.0 V) specs but lacks a defined forward voltage (VF) since it operates identically in both polarities. In contrast, SMCJ28A specifies VF = 3.5 V at 100 A - irrelevant for the SMCJ28C. Use SMCJ28C when polarity is undefined or AC-coupled; choose SMCJ28A for DC-biased single-direction protection.
SMCJ28C 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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 50V
- Current - Peak Pulse (10/1000µs):
- 31A
- 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)
SMCJ28C FAQ
1.How can I place an order for SMCJ28C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28C 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 SMCJ28C reliable?
The price and inventory of SMCJ28C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ28C is usually 5 days.
3.What payment methods are accepted for SMCJ28C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28C?
SMCJ28C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28C 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 SMCJ28C?
For technical support, including SMCJ28C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28C requirements.
6.How does Aetrix verify that SMCJ28C is sourced from the original manufacturer or authorized distributors?
All SMCJ28C 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 SMCJ28C meets industry standards.
7.What is the process for return or replacement of SMCJ28C?
All SMCJ28C units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28C, 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 SMCJ28C part is unused and in its original packaging.
Return procedure for SMCJ28C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ28C Tags
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