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Taiwan Semiconductor Corporation SMAJ10CH
- Part No.:
- SMAJ10CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ10CH.pdf
- Description:
- TVS DIODE 10VWM 18.8VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,495
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Product details
Overview
SMAJ10CH from Taiwan Semiconductor is a unidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 10V working stand-off voltage (VWM), 11.1–13.6V breakdown voltage (VBR), and 18.8V maximum clamping voltage (VC) at 21.3A peak pulse current. It delivers fast response (<1.0ps), low leakage (<5µA @ VWM), and AEC-Q101 qualification for automotive-grade surge protection in DC/DC converters and power supplies.
For engineers reviewing the SMAJ10CH datasheet, SMAJ10CH pinout, SMAJ10CH application, or SMAJ10CH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, unidirectional polarity marking, DO-214AC thermal derating above 25°C, and compatibility with automated SMT placement per J-STD-002 solderability standards.
Technical Context
The SMAJ10CH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 11.1–13.6V breakdown range at 1mA test current. Its glass-passivated junction ensures stable VBR tolerance and low IR drift over temperature.
It sustains 400W peak pulse power (10/1000μs waveform) up to 25°C, derating linearly per Fig.2; clamps transients to ≤18.8V at 21.3A IPPM; and meets moisture sensitivity level 1 (J-STD-020), enabling reflow without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 10 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 11.1 / 13.6 V @ 1 mA - Ensures reliable turn-on within tight tolerance for predictable protection threshold |
| VC @ IPPM | 18.8 V @ 21.3 A - Limits downstream voltage stress during 10/1000μs surge events |
| PPPM | 400 W (10/1000μs) - Supports high-energy transient suppression in automotive and industrial power rails |
| IR @ VWM | <5 µA - Minimizes standby power loss and avoids false triggering in low-power systems |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and high-ambient industrial enclosures |
| Package | DO-214AC (SMA) - Standard surface-mount outline compatible with IPC-7351B land patterns |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, cathode band marking polarity, 0.060g weight, UL 94V-0 rated compound, and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND) in unidirectional configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12V rail); marked by band on package body |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS power domains |
| Glass passivated junction | Ensures long-term VBR stability and reduced parameter drift across temperature and life cycles |
| Fast response time <1.0 ps | Clamps ESD and lightning-induced transients before sensitive ICs experience overstress |
| ISO 7637-2 compliance | Withstands defined automotive load dump and inductive switching pulses (Pulse 1/2a/2b/3a/3b) |
| Moisture sensitivity level 1 | Zero floor life limitation - can be mounted directly from reel without baking |
Applications
| Automotive Power Rail Protection | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs against load dump and alternator transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between input rail and ground, activated only during overvoltage events. Use Value: Limits rail voltage to ≤18.8V during 400W surges, preventing damage to downstream regulators and microcontrollers. | Use Scenario: Safeguarding isolated DC/DC converter primary-side input against switching noise and cross-talk from adjacent power stages. IC Role / Device Role / Timing Role: Standby protection device with <5µA leakage, active only during transient excursions beyond 10V. Use Value: Maintains system efficiency while ensuring immunity to 10/1000μs surges up to 21.3A without derating at 25°C. |
| LED Driver Supply Line | Smart Sensor Node Power Input |
Use Scenario: Suppressing inductive kickback from relay-driven LED arrays in commercial lighting systems. IC Role / Device Role / Timing Role: Fast-acting unidirectional clamp absorbing energy from coil de-energization. Use Value: Prevents voltage spikes >18.8V from damaging constant-current LED drivers and PWM controllers. | Use Scenario: Shielding low-power IoT sensor nodes powered from shared 24V industrial bus lines subject to intermittent surges. IC Role / Device Role / Timing Role: Primary overvoltage guard at board-level input, placed upstream of LDO and MCU. Use Value: Enables robust operation in harsh environments with guaranteed clamping at 21.3A and full AEC-Q101 reliability screening. |
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) and lower VC (17.0V @ 23.5A); same DO-214AC package and 400W rating | Better clamping margin for low-voltage logic rails where 1.8V headroom matters | Select SMAJ10A when tighter VBR tolerance and lower VC are prioritized over peak current handling |
| SMBJ10CH | Same VWM/VBR/VC specs but in larger DO-214AA (SMB) package; higher thermal mass supports longer surge duration | Preferred for high-reliability industrial designs requiring extended 10/1000μs pulse endurance | Choose SMBJ10CH when PCB layout allows larger footprint and thermal management demands exceed SMA limits |
Compared with SMAJ10A and SMBJ10CH, the SMAJ10CH offers balanced clamping performance (18.8V) and compact DO-214AC packaging ideal for space-constrained automotive modules, while maintaining full AEC-Q101 qualification and ISO 7637-2 compliance without requiring PCB redesign.
Availability
SMAJ10CH is available at Aetrix Electronics and suitable for automotive electronics, industrial DC/DC converters, LED driver protection, and smart sensor node power inputs requiring stable component supply and AEC-Q101 reliability assurance.
Supply support for SMAJ10CH 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 automotive-qualified components.
The SMAJ series is designed specifically for high-reliability transient suppression in automotive and industrial power systems, emphasizing AEC-Q101 qualification, ISO 7637-2 compliance, and robust DO-214AC packaging for automated SMT assembly.
FAQ
What is the polarity configuration of SMAJ10CH?
The SMAJ10CH is a unidirectional TVS diode, with cathode indicated by a band on the DO-214AC package body. It conducts in forward bias like a standard diode and clamps reverse transients above its 11.1–13.6V breakdown range. This configuration is explicitly confirmed in the "Devices for Bipolar Applications" section of the datasheet, which states CH-suffix types are unidirectional unless otherwise specified.
Does SMAJ10CH meet automotive qualification standards?
Yes, SMAJ10CH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for automotive electrical disturbances. Its glass-passivated junction, moisture sensitivity level 1 rating, and full temperature range (–55°C to +150°C) support deployment in engine control units, body electronics, and ADAS subsystems per TSC's official documentation.
What is the maximum clamping voltage of SMAJ10CH and under what test condition?
The SMAJ10CH has a maximum clamping voltage (VC) of 18.8 V at 21.3 A peak pulse current (IPPM), measured using the standardized 10/1000μs double-exponential waveform. This value is specified in the Electrical Specifications table on page 2 of the datasheet and defines the upper voltage limit imposed on protected circuits during surge events.
Can SMAJ10CH be used in bidirectional applications?
No - SMAJ10CH is unidirectional only. For bidirectional operation, TSC specifies part numbers with CH or CAH suffixes only for SMAJ5.0H–SMAJ188H types, and explicitly notes that "electrical characteristics apply in both directions" only for those designated variants. The SMAJ10CH marking code "CH" indicates unidirectional construction, consistent with its single-diode configuration and cathode-band polarity marking.
What is the thermal derating behavior of SMAJ10CH above 25°C ambient?
SMAJ10CH's peak pulse power (PPPM) derates linearly above 25°C ambient, per Figure 2 in the datasheet. At 85°C, it retains approximately 70% of its 400W rating (≈280W); at 125°C, ≈45% (≈180W). This derating applies to non-repetitive 10/1000μs pulses and must be accounted for in thermal design of automotive and industrial power rails.
SMAJ10CH 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ10CH FAQ
1.How can I place an order for SMAJ10CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ10CH 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 SMAJ10CH reliable?
The price and inventory of SMAJ10CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ10CH is usually 5 days.
3.What payment methods are accepted for SMAJ10CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ10CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ10CH?
SMAJ10CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ10CH 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 SMAJ10CH?
For technical support, including SMAJ10CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ10CH requirements.
6.How does Aetrix verify that SMAJ10CH is sourced from the original manufacturer or authorized distributors?
All SMAJ10CH 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 SMAJ10CH meets industry standards.
7.What is the process for return or replacement of SMAJ10CH?
All SMAJ10CH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ10CH, 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 SMAJ10CH part is unused and in its original packaging.
Return procedure for SMAJ10CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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