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Taiwan Semiconductor Corporation SMAJ36C
- Part No.:
- SMAJ36C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ36C.pdf
- Description:
- 400W, 44.5V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:7,162
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Product details
Overview
SMAJ36C from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping fast transients in DC power lines. It features a 36 V working stand-off voltage (VWM), 40.0–48.9 V breakdown voltage (VBR @ 1 mA), and clamps to ≤64.3 V at 6.2 A peak pulse current (10/1000 µs waveform), delivering 400 W peak pulse power.
For engineers reviewing the SMAJ36C datasheet, SMAJ36C pinout, SMAJ36C application, or SMAJ36C equivalent, key selection criteria include its unidirectional polarity, glass-passivated junction, sub-1 ps response time, <1 µA leakage above 10 V, and ISO 7637-2 compliance for automotive load-dump and switching surge protection.
Technical Context
The SMAJ36C operates as a clamping-type TVS diode with a single silicon die in avalanche breakdown mode. Its unidirectional configuration provides reverse-biased transient suppression while allowing forward conduction up to 3.5 V at 25 A, enabling use in DC supply rails where polarity is fixed and forward surge tolerance matters.
It meets ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling noise), with thermal derating above 25°C per Fig.2 and peak power defined by the standardized 10/1000 µs double-exponential waveform per R.E.A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 36 V - Maximum continuous DC or RMS voltage the device blocks without significant leakage |
| VBR min/max | 40.0–48.9 V @ 1 mA - Ensures reliable turn-on above system operating voltage with margin against tolerance drift |
| VC @ IPPM | ≤64.3 V @ 6.2 A - Clamping voltage limits downstream IC stress during 10/1000 µs surge events |
| PPPM | 400 W (10/1000 µs) - Sustains high-energy transients common in automotive and industrial power systems |
| IR @ VWM | ≤1 µA - Negligible standby power loss and no measurable loading on 36 V bias networks |
| TJ max | +150 °C - Supports operation in under-hood automotive environments and enclosed power converters |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline compatible with automated placement and reflow |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band; weight ≈0.060 g; UL 94V-0 rated compound; JESD201 Class 2 whisker resistant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path / low-impedance return during surge | Connected to system ground or lower-potential rail; conducts surge current to reference plane |
| Cathode | Protected line input / high-side connection | Connected to line being protected (e.g., +36 V rail); avalanche breakdown occurs between cathode and anode |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable, repeatable avalanche characteristics over temperature and lifetime, critical for automotive-grade reliability |
| Sub-1 ps response time | Clamps ESD and fast-switching transients before sensitive downstream circuitry reacts, preventing latch-up or damage |
| ISO 7637-2 compliance | Validated performance against standardized automotive electrical disturbance waveforms including load dump and inductive switching |
| Moisture sensitivity level 1 | No floor-life limitation or baking required prior to reflow-supports standard SMT assembly without special handling |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS directives for environmentally constrained industrial and automotive applications |
Applications
| Automotive Infotainment Power Rail | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 36 V supply inputs of head-unit MCUs and display drivers from alternator load dump and relay coil flyback. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between 36 V rail and chassis ground, absorbing >400 W surges within nanoseconds. Use Value: Limits transient voltage to ≤64.3 V, keeping MCU VCC pins within absolute maximum ratings and avoiding reset or latch-up. | Use Scenario: Safeguarding 24–36 V digital input channels of programmable logic controllers against field-wiring induced surges and EFT bursts. IC Role / Device Role / Timing Role: Standoff protector on optocoupler input side, conducting only during transients >40 V while remaining high-impedance during normal operation. Use Value: Enables robust 36 V-rated input stage design with <1 µA leakage-no signal attenuation or bias error in steady state. |
| LED Driver Output Stage | Telecom DC Power Interface |
Use Scenario: Suppressing inductive kickback from constant-current LED string drivers during PWM switching or fault interruption. IC Role / Device Role / Timing Role: Parallel-connected TVS across output terminals, clamping flyback spikes before they reach driver MOSFET drain or controller feedback node. Use Value: Prevents drain-source overvoltage failure in 40 V-rated FETs by capping spike energy at 64.3 V with 400 W capability. | Use Scenario: Front-end protection for -48 V telecom rectifier outputs feeding distributed DC-DC modules in base station cabinets. IC Role / Device Role / Timing Role: Unidirectional TVS referenced to system ground, suppressing positive-going surges on the -48 V return path or auxiliary 36 V control rails. Use Value: Maintains immunity to ISO 7637-2 Pulse 1 (load dump) and Pulse 3b (capacitive coupling) without degrading baseline efficiency or EMC behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36A | Bidirectional variant (C suffix = unidirectional, A suffix = bidirectional); same VWM/VBR range but symmetric clamping in both polarities | Required where AC-coupled signals or reversible polarity interfaces need protection (e.g., RS-485, CAN bus) | Select SMAJ36A only if bidirectional clamping is needed; SMAJ36C is optimal for fixed-polarity DC rails |
| SMCJ36A | Higher 1500 W rating (10/1000 µs), DO-214AB (SMC) package, larger footprint and thermal mass | Suitable for higher-energy transients (e.g., 24 V industrial motor drives), not drop-in due to different pad layout and height | Choose SMCJ36A when surge energy exceeds 400 W; SMAJ36C fits space-constrained PCBs requiring 400 W capability |
Compared with SMAJ36A and SMCJ36A, the SMAJ36C offers optimized unidirectional clamping in the smallest standard surface-mount TVS package (DO-214AC), balancing surge robustness, board area, and cost for 36 V DC power line protection.
Availability
SMAJ36C is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC input stages, and LED driver output protection requiring stable component supply and full traceability.
Supply support for SMAJ36C 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 SMAJ series was developed specifically for high-reliability transient suppression in automotive and industrial power systems, emphasizing fast response, low leakage, and AEC-Q101 readiness through rigorous qualification testing.
FAQ
What is the polarity configuration of the SMAJ36C?
The SMAJ36C is a unidirectional TVS diode, meaning it functions as a reverse-biased avalanche clamp-conducting only when cathode voltage exceeds anode voltage by ≥40 V. Its cathode band marks the protected line terminal; anode connects to ground or reference. This configuration ensures zero forward conduction during normal 36 V operation and precise clamping during negative transients.
Does the SMAJ36C meet automotive transient standards?
Yes, the SMAJ36C meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling noise). Its 400 W peak pulse power rating, sub-1 ps response, and specified clamping voltage ensure compliance when used per recommended PCB layout and grounding practices in vehicle ECUs and body control modules.
What is the maximum clamping voltage of the SMAJ36C under surge conditions?
The SMAJ36C has a maximum clamping voltage (VC) of 64.3 V at 6.2 A peak impulse current (IPPM) using the standardized 10/1000 µs waveform. This value is guaranteed across temperature and lifetime per TSC's characterization data and defines the upper voltage limit imposed on protected circuits during worst-case transient events.
Can the SMAJ36C be used in place of a bidirectional TVS like SMAJ36CA?
No-the SMAJ36C is unidirectional and cannot replace bidirectional variants such as SMAJ36CA (or SMAJ36A) in AC-coupled or polarity-agnostic applications. Using SMAJ36C where bidirectional clamping is required leaves the circuit vulnerable to positive transients on the anode side. Always verify signal polarity and transient direction before selecting SMAJ36C.
What is the leakage current specification for the SMAJ36C at its working voltage?
The SMAJ36C exhibits ≤1 µA maximum reverse leakage current (IR) at its 36 V working stand-off voltage (VWM), measured at 25°C. This ultra-low leakage ensures minimal power loss and no measurable loading on 36 V bias networks-critical for battery-powered or energy-sensitive systems where standby current must remain below microamp thresholds.
SMAJ36C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 36V
- Voltage - Breakdown (Min):
- 40V
- Voltage - Clamping (Max) @ Ipp:
- 64.3V
- Current - Peak Pulse (10/1000µs):
- 6.2A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ36C FAQ
1.How can I place an order for SMAJ36C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ36C 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 SMAJ36C reliable?
The price and inventory of SMAJ36C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ36C is usually 5 days.
3.What payment methods are accepted for SMAJ36C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ36C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ36C?
SMAJ36C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ36C 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 SMAJ36C?
For technical support, including SMAJ36C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ36C requirements.
6.How does Aetrix verify that SMAJ36C is sourced from the original manufacturer or authorized distributors?
All SMAJ36C 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 SMAJ36C meets industry standards.
7.What is the process for return or replacement of SMAJ36C?
All SMAJ36C units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ36C, 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 SMAJ36C part is unused and in its original packaging.
Return procedure for SMAJ36C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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