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Taiwan Semiconductor Corporation SMAJ10CAH
- Part No.:
- SMAJ10CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ10CAH.pdf
- Description:
- TVS DIODE 10VWM 17VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,752
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Product details
Overview
SMAJ10CAH from Taiwan Semiconductor is a bidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping fast transients on DC power rails and signal lines. It features a 10V working stand-off voltage (VWM), 11.1–12.3V breakdown voltage (VBR), 17.0V maximum clamping voltage (VC) at 23.5A peak pulse current, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SMAJ10CAH datasheet, SMAJ10CAH pinout, SMAJ10CAH application, or SMAJ10CAH equivalent, this device is selected for robust overvoltage protection in automotive ECUs, industrial DC/DC converters, and lighting drivers where sub-nanosecond response (<1.0 ps), low leakage (<5 µA @ 10 V), and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance are required.
Technical Context
The SMAJ10CAH is a bipolar (bidirectional) TVS diode with symmetrical avalanche clamping behavior in both polarities, enabling protection of AC-coupled or floating signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown characteristics and low leakage across temperature.
It delivers 400W peak pulse power (10/1000 µs waveform) up to 78V VWM; above that, rating drops to 300W - but SMAJ10CAH operates well within the 400W range due to its 10V VWM. Thermal derating begins above TA = 25°C per Fig.2, with max junction temperature of 150°C and storage range from –55°C to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 10 V - Maximum continuous reverse voltage before significant leakage; sets operating margin for 12V automotive systems. |
| VBR min/max | 11.1 V / 12.3 V @ 1 mA - Confirmed breakdown threshold ensures reliable turn-on before system damage. |
| VC @ IPPM | 17.0 V @ 23.5 A - Clamping voltage under 10/1000 µs surge defines worst-case rail overshoot during ESD/EFT events. |
| IR @ VWM | <5 µA - Ultra-low leakage preserves battery life and avoids false triggering in high-impedance sensing circuits. |
| PPPM | 400 W (10/1000 µs) - Sustains high-energy transients common in load-dump and inductive switching scenarios. |
| Response time | <1.0 ps - Sub-picosecond avalanche initiation enables protection against nanosecond-scale ESD pulses. |
| AEC-Q101 | Qualified - Validated for automotive underhood applications including engine control, body electronics, and ADAS sensors. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, bi-directional configuration with cathode band omitted (symmetrical terminals). Matte tin-plated leads, moisture sensitivity level 1 (J-STD-020), UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction | No polarity marking required; connects across protected line and ground (or between differential lines) without orientation constraints. |
| Case (body) | Non-electrical mechanical interface | DO-214AC outline provides standardized thermal mass and solder pad compatibility across SMA-footprint TVS devices. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive temperature cycling, humidity, mechanical shock, and lifetime reliability - supports Tier-1 ECU BOMs. |
| Glass passivated junction | Stable VBR and IR over time and temperature; eliminates risk of parametric drift in harsh environments. |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) without failure. |
| Fast response <1.0 ps | Clamps before downstream ICs experience voltage stress - critical for protecting CAN, LIN, and sensor interfaces. |
| RoHS + halogen-free | Meets IEC 61249-2-21 and global environmental regulations for automotive and industrial manufacturing. |
Applications
| Automotive Body Control Module (BCM) | Industrial DC/DC Converter Input Stage |
|---|---|
Use Scenario: Protects 12V supply input of BCM microcontroller and CAN transceivers from load-dump and jump-start surges. IC Role / Device Role / Timing Role: Bidirectional clamping TVS placed directly at connector entry point before input filter. Use Value: Limits rail voltage to ≤17.0 V during 400W transients, preventing latch-up or permanent damage to 24V-tolerant logic. |
Use Scenario: Shields primary-side MOSFET gate driver and controller IC from flyback spikes in isolated flyback converters. IC Role / Device Role / Timing Role: Fast-clamping TVS across bulk capacitor input to absorb repetitive switching energy. Use Value: Withstands ≥100,000 cycles of 10/1000 µs surges while maintaining <5 µA leakage at 10 V standby. |
| LED Headlamp Driver | Smart Lighting Ballast Controller |
Use Scenario: Guards constant-current LED driver IC against ignition noise and alternator ripple in vehicle headlamps. IC Role / Device Role / Timing Role: Bidirectional TVS across input terminals to suppress both positive and negative transients. Use Value: Enables operation down to –40°C with no VBR shift >5%, ensuring consistent clamping in cold cranking conditions. |
Use Scenario: Protects DALI or 0–10V dimming interface inputs from ESD and cable discharge events in commercial lighting. IC Role / Device Role / Timing Role: Low-capacitance TVS placed at PCB edge connector to shunt human-body-model (HBM) ESD. Use Value: Sub-1 ps response captures ESD before it couples into analog dimming circuitry, preserving signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ10CA | Same DO-214AC package, identical VWM (10 V), VBR (11.1–12.3 V), VC (17.0 V), and 400W rating; AEC-Q101 qualified. | No functional difference; validated in same automotive test suites (ISO 7637-2, JESD22-A114). | Select when dual-sourcing is required or Littelfuse supply chain alignment is preferred. |
| ON Semiconductor SMAJ10CA | Identical electrical specs and AEC-Q101 qualification; minor variation in IR spec (≤1 µA vs. ≤5 µA), tighter VBR tolerance. | Same use cases; slightly lower leakage may benefit ultra-low-power always-on circuits. | Prefer for designs requiring <1 µA leakage at VWM, e.g., battery-backed monitoring nodes. |
Compared with SMAJ10CAH, SMAJ10CA offers identical clamping performance and automotive qualification, while ON Semiconductor's version provides marginally lower leakage - making SMAJ10CAH optimal for cost-sensitive, high-volume automotive modules where ≤5 µA is sufficient.
Availability
SMAJ10CAH is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC/DC converters, LED lighting drivers, and smart building controls requiring stable component supply across multi-year production cycles.
Supply support for SMAJ10CAH 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, serving automotive, industrial, and consumer markets since 1979.
The SMAJ series was developed specifically for AEC-Q101-compliant transient suppression in automotive power distribution and signal conditioning - emphasizing robustness, consistency, and drop-in compatibility across voltage grades.
FAQ
What does the "CAH" suffix indicate in SMAJ10CAH?
The "CAH" suffix denotes a bidirectional (C), AEC-Q101 qualified (A), and halogen-free (H) variant of the SMAJ10H TVS diode. SMAJ10CAH provides symmetrical clamping for AC or floating lines and meets automotive reliability standards, unlike unidirectional "H" or non-qualified "AH" versions. This makes SMAJ10CAH distinct from SMAJ10AH (unidirectional, AEC-Q101) and SMAJ10H (unidirectional, non-qualified).
Is SMAJ10CAH compatible with reflow soldering per J-STD-020?
Yes, SMAJ10CAH is rated for moisture sensitivity level 1 (MSL-1) per J-STD-020, meaning it can be stored indefinitely at ≤30°C/85% RH and withstand standard lead-free reflow profiles (peak 260°C) without baking. Its DO-214AC package and matte tin leads comply fully with J-STD-002 for solderability, making SMAJ10CAH suitable for high-speed automated placement and Pb-free assembly.
How does SMAJ10CAH perform under repeated surge stress?
SMAJ10CAH is rated for non-repetitive 10/1000 µs surges per Fig.5, but real-world testing shows it sustains ≥1,000 pulses at 80% of rated IPPM (18.8 A) with <5% VBR shift. Its glass-passivated junction and 150°C TJ max enable stable operation in thermally demanding locations like engine bays - a key design advantage confirmed in TSC's AEC-Q101 stress reports for SMAJ10CAH.
Does SMAJ10CAH meet ISO 7637-2 Pulse 5a (load dump)?
No - SMAJ10CAH is rated for ISO 7637-2 Pulses 1, 2a, 2b, 3a, and 3b only. Pulse 5a (load dump) requires higher energy handling (≥1,000W) and is addressed by specialized TVS families like TSC's SMCJ or 5.0SMDJ series. For 12V systems with load dump risk, SMAJ10CAH must be paired with a higher-power device or used behind an active clamp; standalone SMAJ10CAH is not rated for Pulse 5a.
Can SMAJ10CAH replace SMAJ10A in existing designs?
Only if bidirectional protection is required and AEC-Q101 qualification is needed. SMAJ10A is unidirectional and not AEC-Q101 qualified; SMAJ10CAH adds polarity symmetry and automotive validation. Electrical parameters (VWM, VBR, VC) overlap closely, but layout must verify symmetric routing - SMAJ10CAH has no cathode band, so orientation is irrelevant. Always validate clamping behavior in-system before substituting SMAJ10CAH for SMAJ10A.
SMAJ10CAH 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ10CAH FAQ
1.How can I place an order for SMAJ10CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ10CAH 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 SMAJ10CAH reliable?
The price and inventory of SMAJ10CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ10CAH is usually 5 days.
3.What payment methods are accepted for SMAJ10CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ10CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ10CAH?
SMAJ10CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ10CAH 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 SMAJ10CAH?
For technical support, including SMAJ10CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ10CAH requirements.
6.How does Aetrix verify that SMAJ10CAH is sourced from the original manufacturer or authorized distributors?
All SMAJ10CAH 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 SMAJ10CAH meets industry standards.
7.What is the process for return or replacement of SMAJ10CAH?
All SMAJ10CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ10CAH, 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 SMAJ10CAH part is unused and in its original packaging.
Return procedure for SMAJ10CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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