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Taiwan Semiconductor Corporation SMAJ10C
- Part No.:
- SMAJ10C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ10C.pdf
- Description:
- 400W, 12.4V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:5,888
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Product details
Overview
SMAJ10C from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) in DO-214AC (SMA) package, designed for overvoltage protection of DC power rails and signal lines. It features a 10V working stand-off voltage (VWM), 11.1–13.6V breakdown voltage (VBR @ 1mA), and clamps to ≤18.8V at 21.3A peak pulse current (10/1000μs waveform), meeting ISO 7637-2 Pulse 1/2a/2b/3a/3b requirements for automotive electronics.
For engineers reviewing the SMAJ10C datasheet, SMAJ10C pinout, SMAJ10C application, or SMAJ10C equivalent, key selection criteria include its unidirectional polarity, 150°C maximum junction temperature, <1.0ps response time, <5μA reverse leakage at VWM, and compatibility with automated SMT placement on board-level DC/DC converters and SMPS input stages.
Technical Context
The SMAJ10C operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology for stable clamping under fast transients. Its electrical behavior is defined by precise VBR (11.1–13.6V), low dynamic impedance, and guaranteed clamping voltage (VC ≤18.8V at IPPM = 21.3A), ensuring predictable overvoltage limiting during ESD or load-dump events.
It supports continuous operation up to 1W steady-state power dissipation and withstands 40A non-repetitive forward surge (8.3ms half-sine). The device is rated for -55°C to +150°C junction temperature range and complies with J-STD-020 moisture sensitivity level 1, making it suitable for reflow-soldered industrial and automotive PCB assemblies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 10 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin for 12V systems. |
| VBR @ IT=1mA | 11.1–13.6 V - Measured breakdown threshold; ensures reliable triggering above nominal supply while avoiding false trips. |
| VC @ IPPM=21.3A | ≤18.8 V - Clamped voltage during 10/1000μs transient; limits downstream IC stress to safe levels in 12V automotive applications. |
| PPPM | 400 W - Peak pulse power handling (10/1000μs); sustains high-energy surges like ISO 7637-2 Pulse 5a without failure. |
| IR @ VWM | <5 μA - Reverse leakage at 10V; minimizes standby power loss and avoids false triggering in low-current sensor circuits. |
| Response Time | <1.0 ps - Time from 0V to VBR; enables effective suppression of nanosecond-scale ESD and fast-switching noise. |
| Package | DO-214AC (SMA) - Standard surface-mount outline with cathode band marking; compatible with JEDEC-standard SMT pick-and-place and reflow profiles. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (cathode terminal marked), weight ≈0.060g, UL 94V-0 rated compound, JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Transient return path | Connected to protected line (e.g., 12V rail); conducts during reverse-biased clamping event to shunt surge to ground. |
| Cathode | Reverse-biased reference / Clamping node | Connected to system ground; establishes VWM and VBR reference; cathode band marking identifies this terminal on PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive electronic modules requiring immunity to battery-line transients and inductive switching noise. |
| Moisture sensitivity level 1 (J-STD-020) | Enables standard SMT reflow without baking; eliminates pre-conditioning delays in high-volume manufacturing. |
| RoHS and halogen-free (IEC 61249-2-21) | Meets global environmental compliance mandates for industrial and consumer electronics supply chains. |
| Fast response <1.0ps | Protects sensitive analog and digital ICs (e.g., CAN transceivers, microcontrollers) from sub-nanosecond ESD events. |
Applications
| Automotive Body Control Module (BCM) | Industrial SMPS Input Stage |
|---|---|
Use Scenario: Protects 12V supply rail in BCM against load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS diode clamping transient energy to ground during voltage spikes. Use Value: Limits rail voltage to ≤18.8V during 400W surges, preventing damage to MCU, LIN transceivers, and power switches. |
Use Scenario: Shields primary-side rectifier and controller ICs in offline AC/DC adapters from line surges. IC Role / Device Role / Timing Role: Fast-acting overvoltage clamp on DC bus after bridge rectification. Use Value: Withstands 21.3A peak impulse (10/1000μs) while maintaining VC ≤18.8V, preserving MOSFET gate oxide integrity. |
| LED Driver On-board DC/DC Converter | Smart Lighting Power Supply |
Use Scenario: Guards buck converter input in LED streetlight drivers exposed to lightning-induced surges on outdoor wiring. IC Role / Device Role / Timing Role: Primary transient suppression element on 24–48V intermediate bus. Use Value: 400W peak power rating and 150°C TJ max enable robust operation in thermally constrained outdoor enclosures. |
Use Scenario: Provides secondary-side overvoltage protection in DALI or 0–10V dimmable LED power supplies. IC Role / Device Role / Timing Role: Unidirectional clamping diode across low-voltage control lines (e.g., 10V reference). Use Value: Ultra-low 5μA leakage at 10V prevents drift in precision analog dimming circuits while responding in <1ps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ10A | Narrower VBR range (11.1–12.3V vs. 11.1–13.6V); lower clamping voltage (VC ≤17.0V @ 23.5A). | Better suited for tighter-tolerance 12V systems where lower clamping headroom is critical. | Select SMAJ10A when minimizing clamped voltage is prioritized over worst-case VBR margin. |
| SMBJ10C | Same VWM/VBR specs but higher PPPM (600W) in larger DO-214AA (SMB) package; 1.5× footprint area. | Used where higher surge endurance is required and PCB space allows larger package. | Choose SMBJ10C only if 600W rating is mandatory and DO-214AC size constraint does not apply. |
Compared with SMAJ10A and SMBJ10C, the SMAJ10C offers optimal balance of compact DO-214AC footprint, 400W surge capability, and verified ISO 7637-2 compliance-making it the preferred choice for space-constrained 12V automotive and industrial DC/DC designs requiring proven reliability and SMT manufacturability.
Availability
SMAJ10C is available at Aetrix Electronics and suitable for automotive body control modules, industrial switch-mode power supplies, and LED driver on-board DC/DC converters requiring stable component supply across extended temperature and surge environments.
Supply support for SMAJ10C 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, and rectifiers, with global distribution and AEC-Q200 qualified product lines.
The SMAJ series was developed specifically for robust, surface-mount transient suppression in automotive and industrial power systems-emphasizing fast response, high surge rating, and JEDEC-compliant packaging for automated assembly.
FAQ
What is the polarity configuration of the SMAJ10C?
The SMAJ10C is a unidirectional TVS diode, with cathode marked by a band on the DO-214AC package. It conducts only when the cathode is at higher potential than the anode-making it suitable for protecting positive DC rails like 12V automotive systems. This differs from bidirectional variants (e.g., SMAJ10CA), which suppress transients in both directions.
Does the SMAJ10C meet automotive transient immunity standards?
Yes, the SMAJ10C meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements for automotive electronic components. Its 400W peak pulse power rating (10/1000μs), clamping performance (VC ≤18.8V), and -55°C to +150°C operating range make it qualified for use in body control modules, infotainment power supplies, and other 12V vehicle subsystems.
What is the maximum clamping voltage of the SMAJ10C under surge conditions?
The SMAJ10C has a maximum clamping voltage (VC) of 18.8 V when subjected to its rated peak pulse current of 21.3 A (10/1000μs waveform). This value is guaranteed across the full operating temperature range and ensures downstream components see no more than 18.8 V during transient events, critical for safeguarding 20V-rated ICs on 12V rails.
Can the SMAJ10C be used in bidirectional signal line protection?
No-the SMAJ10C is unidirectional and unsuitable for bidirectional signal lines such as RS-485 or CAN bus. For those applications, a bidirectional variant like SMAJ10CA must be used. Using SMAJ10C on a bidirectional line would result in unintended forward conduction during negative transients, potentially damaging the circuit or failing to suppress them.
What is the reverse leakage current specification for the SMAJ10C at its working voltage?
The SMAJ10C exhibits a maximum reverse leakage current (IR) of 5 μA at its working stand-off voltage (VWM) of 10 V, measured at 25°C. This low leakage preserves signal integrity in high-impedance monitoring circuits and minimizes quiescent power loss in battery-powered systems where the SMAJ10C is deployed.
SMAJ10C 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):
- 10V
- Voltage - Breakdown (Min):
- 11.1V
- Voltage - Clamping (Max) @ Ipp:
- 18.8V
- Current - Peak Pulse (10/1000µs):
- 21.3A
- 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)
SMAJ10C FAQ
1.How can I place an order for SMAJ10C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ10C 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 SMAJ10C reliable?
The price and inventory of SMAJ10C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ10C is usually 5 days.
3.What payment methods are accepted for SMAJ10C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ10C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ10C?
SMAJ10C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ10C 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 SMAJ10C?
For technical support, including SMAJ10C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ10C requirements.
6.How does Aetrix verify that SMAJ10C is sourced from the original manufacturer or authorized distributors?
All SMAJ10C 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 SMAJ10C meets industry standards.
7.What is the process for return or replacement of SMAJ10C?
All SMAJ10C units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ10C, 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 SMAJ10C part is unused and in its original packaging.
Return procedure for SMAJ10C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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