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Taiwan Semiconductor Corporation SMAJ10CA
- Part No.:
- SMAJ10CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ10CA.pdf
- Description:
- TVS DIODE 10VWM 17VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,823
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Product details
Overview
SMAJ10CA from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust ESD and surge protection on DC power rails and signal lines. It features a 10 V working stand-off voltage (VWM), 17.0 V maximum clamping voltage (VC) at 23.5 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SMAJ10CA datasheet, SMAJ10CA pinout, SMAJ10CA application, or SMAJ10CA equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, unidirectional vs. bidirectional configuration (CA = bidirectional), moisture sensitivity level (MSL 1), and compatibility with automated SMT placement on industrial power supplies and automotive ECUs.
Technical Context
The SMAJ10CA employs a glass-passivated silicon junction optimized for fast transient response (<1.0 ps rise time from 0 V to VBR min) and low leakage (<5 µA at 10 V). Its bidirectional architecture enables symmetrical clamping in both polarities, eliminating polarity dependency in AC-coupled or floating bus protection.
It operates across –55 °C to +150 °C junction temperature range and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements. The device is rated for 40 A non-repetitive forward surge (IFSM, 8.3 ms half-sine) and supports steady-state power dissipation up to 1 W at 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 10 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 12 V systems. |
| VBR min / max | 11.1 V / 12.3 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | 17.0 V at 23.5 A - Clamping voltage during 10/1000 μs surge; limits downstream IC stress to ≤17 V under 400 W transient. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 μs waveform; sufficient for ISO 7637-2 Pulse 1 (inductive load dump) and Pulse 2b (battery disconnect). |
| IR @ VWM | <5 µA - Reverse leakage at 10 V; negligible power loss and minimal impact on high-impedance sensing circuits. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and enclosed industrial enclosures. |
| Package | DO-214AC (SMA) - Standard surface-mount outline with 0.060 g mass; compatible with JEDEC-standard reflow profiles and J-STD-002 solderability. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, cathode band marking for unidirectional variants; SMAJ10CA is bidirectional and marked with "AX" code - no polarity band required. Leads meet JESD201 Class 2 whisker resistance and are solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient conduction path | Both terminals function identically; clamps positive or negative transients equally without orientation constraints. |
| Case | Non-electrical mechanical interface | Plastic body provides insulation and thermal mass; no electrical connection or grounding requirement. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable breakdown characteristics over temperature and lifetime; prevents surface degradation under humidity or bias stress. |
| Fast response time <1.0 ps | Clamps ESD events (IEC 61000-4-2) before sensitive logic or analog circuitry sustains damage. |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive 12 V system transients including load dump (Pulse 5a not covered), ensuring design acceptance without additional validation. |
| MSL Level 1 per J-STD-020 | Zero floor life limitation; can be stored indefinitely before reflow and processed in standard SMT lines without baking. |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU; suitable for green manufacturing and export to regulated markets. |
Applications
| Automotive Body Control Module (BCM) | Industrial SMPS Input Stage |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins from battery line transients during jump-start or alternator load dump. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between LIN line and ground, absorbing energy from ISO 7637-2 Pulse 2b (battery disconnect) and Pulse 3b (capacitive coupling). Use Value: Limits voltage excursion to ≤17.0 V during 23.5 A surges, preventing latch-up or gate oxide rupture in 5 V/3.3 V logic interfaces. | Use Scenario: Safeguarding primary-side controller ICs and optocoupler inputs against switching noise and input line surges in 24 V industrial switch-mode power supplies. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor or controller VDD pin to clamp fast-rising spikes induced by MOSFET switching or lightning-induced surges. Use Value: Maintains VDD rail integrity below 17.0 V during 400 W transients, avoiding brown-out resets or internal LDO failure in PWM controllers. |
| LED Driver Output Protection | USB-C Power Delivery Bus |
Use Scenario: Shielding constant-current LED driver outputs from inductive kickback when driving solenoid-based dimming actuators or relay loads. IC Role / Device Role / Timing Role: Placed across LED string output terminals to absorb reverse EMF from inductive loads during turn-off transitions. Use Value: Clamps flyback voltage to ≤17.0 V within <1 ps, protecting driver FETs and current-sense amplifiers rated for ≤20 V absolute maximum. | Use Scenario: Providing secondary-level surge immunity on USB-C VBUS lines in portable docking stations exposed to hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional TVS placed between VBUS and GND to suppress ±15 kV contact ESD (IEC 61000-4-2) and 10/1000 μs line surges up to 400 W. Use Value: Delivers sub-17 V clamping at 23.5 A while maintaining <5 µA leakage at 10 V, preserving VBUS regulation accuracy and PD negotiation integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ10A (Taiwan Semiconductor) | Unidirectional variant; same VWM (10 V), VBR (11.1–12.3 V), VC (17.0 V), and PPPM (400 W); requires correct polarity orientation. | Only suitable where circuit polarity is fixed and known (e.g., DC input rails with defined ground reference). | Select SMAJ10A only if polarity is guaranteed and board layout allows cathode-band alignment; otherwise SMAJ10CA avoids orientation risk. |
| SMBJ10CA (ON Semiconductor) | Same bidirectional function and VWM (10 V), but SMB package (DO-214AA); higher VC (17.0 V same), identical 400 W rating, but 1.5× larger footprint and 0.12 g mass. | Compatible with higher-power layouts requiring greater thermal mass; not drop-in due to different pad dimensions and land pattern. | Choose SMBJ10CA only when thermal derating or mechanical robustness outweighs space constraints; SMAJ10CA fits tighter pitch designs. |
Compared with SMAJ10A and SMBJ10CA, SMAJ10CA uniquely combines bidirectional symmetry, DO-214AC footprint efficiency, and full ISO 7637-2 compliance - making it optimal for compact, polarity-agnostic protection in automotive and industrial DC rails where layout flexibility and reliability are prioritized over raw thermal capacity.
Availability
SMAJ10CA is available at Aetrix Electronics and suitable for automotive body electronics, industrial switch-mode power supplies, LED driver protection, and USB-C power delivery systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMAJ10CA 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, TVS diodes, rectifiers, and MOSFETs since 1979.
The SMAJ series is part of TSC's transient suppression portfolio engineered specifically for AEC-Q101-compliant automotive subsystems and industrial-grade surge immunity - emphasizing reliability under thermal cycling, humidity, and repetitive transient stress.
FAQ
What is the clamping voltage of SMAJ10CA and how is it measured?
The SMAJ10CA has a maximum clamping voltage (VC) of 17.0 V, measured at a peak pulse current (IPPM) of 23.5 A using the standardized 10/1000 μs double-exponential waveform. This value is guaranteed across the full operating temperature range and represents the highest voltage seen across the device during worst-case surge conditions - critical for ensuring downstream ICs remain within their absolute maximum ratings.
Is SMAJ10CA unidirectional or bidirectional, and how does that affect PCB layout?
SMAJ10CA is a bidirectional TVS diode, indicated by the "CA" suffix. Unlike unidirectional variants (e.g., SMAJ10A), it clamps symmetrically for both positive and negative transients, eliminating the need for polarity-aware placement. No cathode band marking is used, and the device may be mounted in either orientation - simplifying layout, reducing assembly errors, and enabling use on AC-coupled or floating buses.
Does SMAJ10CA meet automotive transient immunity standards?
Yes, SMAJ10CA meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a (sudden load removal), Pulse 2b (battery disconnection), Pulse 3a (capacitive coupling), and Pulse 3b (capacitive coupling with ground bounce). It is widely deployed in automotive body control modules and infotainment power rails, though it is not rated for Pulse 5a (alternator load dump) which requires higher energy handling.
What is the maximum operating temperature and thermal derating behavior of SMAJ10CA?
SMAJ10CA has a maximum junction temperature (TJ) of +150 °C and is rated for continuous operation from –55 °C to +150 °C. Its peak pulse power (400 W) is derated linearly above 25 °C ambient per Figure 2 in the datasheet - e.g., at 85 °C ambient, usable PPPM drops to ~280 W. This derating must be applied in thermally constrained enclosures or high-ambient environments like engine compartments.
Can SMAJ10CA be used in place of SMAJ10A, and what changes are needed?
Yes, SMAJ10CA can replace SMAJ10A in most applications, but no PCB changes are required only if the original layout accommodates bidirectional symmetry - i.e., no polarity-specific routing or cathode band alignment. Since SMAJ10CA lacks a polarity marker, it removes orientation dependency, improving assembly yield. However, verify that system-level testing confirms equivalent clamping performance under both polarities, especially in mixed-signal or analog-sensitive nodes.
SMAJ10CA 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:
- 17V
- Current - Peak Pulse (10/1000µs):
- 23.5A
- 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)
SMAJ10CA FAQ
1.How can I place an order for SMAJ10CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ10CA 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 SMAJ10CA reliable?
The price and inventory of SMAJ10CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ10CA is usually 5 days.
3.What payment methods are accepted for SMAJ10CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ10CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ10CA?
SMAJ10CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ10CA 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 SMAJ10CA?
For technical support, including SMAJ10CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ10CA requirements.
6.How does Aetrix verify that SMAJ10CA is sourced from the original manufacturer or authorized distributors?
All SMAJ10CA 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 SMAJ10CA meets industry standards.
7.What is the process for return or replacement of SMAJ10CA?
All SMAJ10CA units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ10CA, 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 SMAJ10CA part is unused and in its original packaging.
Return procedure for SMAJ10CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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