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Taiwan Semiconductor Corporation SMAJ10AH
- Part No.:
- SMAJ10AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ10AH.pdf
- Description:
- TVS DIODE 10VWM 17VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,963
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Product details
Overview
SMAJ10AH from Taiwan Semiconductor is a unidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for overvoltage protection of DC power lines and signal paths. It features a 10V working stand-off voltage (VWM), 11.1–12.3V breakdown voltage (VBR), 17.0V clamping voltage (VC) at 23.5A peak pulse current, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SMAJ10AH datasheet, SMAJ10AH pinout, SMAJ10AH application, or SMAJ10AH equivalent, this device is selected for robust surge immunity in on-board DC/DC converters, SMPS front-end rails, lighting drivers, and automotive body electronics where fast response (<1.0ps), low leakage (<5µA @ 10V), and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance are required.
Technical Context
The SMAJ10AH operates as a unidirectional avalanche diode with glass-passivated junction, enabling sub-nanosecond response to transients. Its clamping action begins at VBR min = 11.1V and limits line voltage to ≤17.0V under 10/1000μs 23.5A surge, delivering 400W peak pulse power at TA = 25°C (derated above ambient).
It supports continuous operation from –55°C to +150°C junction temperature, meets JESD201 Class 2 whisker resistance, and uses matte tin-plated leads compliant with J-STD-002 solderability. Polarity is marked by cathode band; moisture sensitivity level is J-STD-020 Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 10 V - Maximum continuous reverse operating voltage before leakage exceeds 5 µA |
| VBR min/max | 11.1 / 12.3 V - Breakdown occurs within this range at 1 mA test current; defines turn-on threshold |
| VC @ IPPM | 17.0 V - Clamped voltage across device during 23.5 A 10/1000μs surge; determines protected circuit stress |
| PPPM | 400 W - Peak pulse power handling per 10/1000μs waveform; derates linearly above 25°C ambient |
| IR @ VWM | <5 µA - Reverse leakage at rated stand-off voltage; ensures minimal standby power loss |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments |
| Package | DO-214AC (SMA) - Surface-mount outline with 0.060 g mass; compatible with automated placement |
Pinout & Package
DO-214AC (SMA) package: single-axis, two-terminal surface-mount device with cathode band marking polarity. Body dimensions: 4.57 × 2.92 × 2.29 mm (L × W × H); lead spacing: 2.29 mm; weight ≈ 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side (cathode-banded end is cathode) | Connected to protected line; conducts during reverse surge to clamp voltage |
| Cathode | Ground/reference side (marked with band) | Connected to system ground or low-impedance return; establishes unidirectional conduction path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including temperature cycling, humidity bias, and mechanical shock per AEC standard |
| Clamping voltage ≤17.0 V | Ensures downstream ICs (e.g., MCUs, gate drivers) remain below absolute maximum ratings during ISO 7637-2 transients |
| Response time <1.0 ps | Activates before most ESD or load-dump energy couples into sensitive circuitry; protects against fast-edge transients |
| Moisture sensitivity Level 1 | Zero bake requirement prior to reflow; supports standard SMT assembly without special handling |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive; suitable for green manufacturing and export markets |
Applications
| Automotive Body Control Module (BCM) | Industrial SMPS Input Stage |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O from load dump and jump-start surges in door modules and lighting controllers. IC Role / Device Role / Timing Role: Unidirectional TVS placed between LIN line and chassis ground to clamp transients up to ±100 V. Use Value: Maintains signal integrity during ISO 7637-2 Pulse 5a (load dump) by limiting voltage to ≤17.0 V at 23.5 A, preventing latch-up or damage to 5V-tolerant transceivers. | Use Scenario: Safeguarding primary-side controller ICs and MOSFET gates in 24V-input AC/DC adapters and industrial power supplies. IC Role / Device Role / Timing Role: Front-end TVS on DC input rail upstream of bulk capacitor and PWM controller. Use Value: Absorbs 400W 10/1000μs surges without degradation, enabling reliable operation in factory environments with frequent line switching and inductive kickback. |
| LED Driver Power Input | On-Board DC/DC Converter Protection |
Use Scenario: Shielding constant-current LED driver ICs from voltage spikes caused by hot-plug events or cable discharge in architectural lighting systems. IC Role / Device Role / Timing Role: Unidirectional TVS connected between 12V input and GND, adjacent to input filter capacitor. Use Value: Limits transient overshoot to ≤17.0 V within <1 ps, preventing overvoltage shutdown or internal FET failure in buck controller ICs rated for 20V max input. | Use Scenario: Securing 5V/3.3V point-of-load regulators in automotive infotainment head units against battery line disturbances. IC Role / Device Role / Timing Role: Secondary-side TVS on output rail of isolated DC/DC module, referenced to local ground plane. Use Value: Provides bidirectional-like protection via layout symmetry and clamps output excursions to safe levels during coupled transients, preserving regulator stability and load safety. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ10H | Higher VBR (11.1–13.6 V) and VC (18.8 V); same package and power rating | Less precise clamping; higher let-through voltage may stress marginally rated downstream ICs | Select SMAJ10AH when tighter VBR tolerance and lower VC are required for 5V/12V rail protection |
| SMBJ10AH | Same electrical specs but in larger DO-214AA (SMB) package; 600W peak power rating | Higher thermal mass and power handling; requires larger PCB footprint and different pad layout | Choose SMBJ10AH only if system-level surge testing exceeds 400W or thermal dissipation demands greater margin |
Compared with SMAJ10H and SMBJ10AH, the SMAJ10AH offers optimal balance of precision clamping (17.0 V), compact DO-214AC footprint, and AEC-Q101 qualification-making it preferred for space-constrained automotive and industrial DC/DC designs requiring repeatable surge immunity.
Availability
SMAJ10AH is available at Aetrix Electronics and suitable for automotive body electronics, industrial SMPS, LED driver inputs, and on-board DC/DC converter protection requiring stable component supply across production lifecycles.
Supply support for SMAJ10AH 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 high-reliability protection devices, rectifiers, and TVS diodes.
The SMAJ series was developed specifically for AEC-Q101-compliant automotive and industrial transient suppression, emphasizing fast response, tight parameter distribution, and robust packaging for harsh-environment deployment.
FAQ
What is the clamping voltage of SMAJ10AH under a 10/1000μs surge?
The SMAJ10AH has a maximum clamping voltage (VC) of 17.0 V when subjected to its rated peak pulse current of 23.5 A using the standardized 10/1000μs waveform. This value is measured at TA = 25°C and ensures protected circuits remain within safe operating limits during common automotive and industrial transients. The SMAJ10AH maintains this clamping performance across its full operating temperature range.
Is SMAJ10AH unidirectional or bidirectional?
SMAJ10AH is a unidirectional transient voltage suppressor, indicated by the absence of "C" or "CA" suffix and confirmed by its cathode-band marking and single-diode configuration. It conducts only during reverse-biased surges-protecting positive-rail lines referenced to ground. For bidirectional protection, TSC offers SMAJ10CH or SMAJ10CAH variants with symmetrical breakdown in both polarities.
Does SMAJ10AH meet automotive qualification standards?
Yes, SMAJ10AH is AEC-Q101 qualified, having passed stress tests including temperature cycling, high-temperature operating life, and mechanical shock per the AEC-Q101 standard. It also meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for automotive electrical disturbance immunity, making it suitable for under-hood and body electronics applications.
What is the maximum steady-state power dissipation of SMAJ10AH?
The SMAJ10AH has a steady-state power dissipation (PD) rating of 1 W at TA = 25°C. This value applies to continuous DC or low-frequency reverse-bias conditions-not transient events. In normal operation, reverse leakage remains below 5 µA at 10 V, resulting in negligible static power loss. Thermal design must account for ambient derating above 25°C per Figure 2 in the official datasheet.
Can SMAJ10AH be used in place of SMAJ10H?
SMAJ10AH can replace SMAJ10H in most designs, but with improved performance: its VBR range is tighter (11.1–12.3 V vs. 11.1–13.6 V) and clamping voltage is lower (17.0 V vs. 18.8 V). This results in better protection margin for downstream 12V-rated ICs. No PCB changes are needed since both share identical DO-214AC (SMA) package and pinout-however, verify layout clearance and thermal relief for your specific surge duty cycle.
SMAJ10AH 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ10AH FAQ
1.How can I place an order for SMAJ10AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ10AH 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 SMAJ10AH reliable?
The price and inventory of SMAJ10AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ10AH is usually 5 days.
3.What payment methods are accepted for SMAJ10AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ10AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ10AH?
SMAJ10AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ10AH 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 SMAJ10AH?
For technical support, including SMAJ10AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ10AH requirements.
6.How does Aetrix verify that SMAJ10AH is sourced from the original manufacturer or authorized distributors?
All SMAJ10AH 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 SMAJ10AH meets industry standards.
7.What is the process for return or replacement of SMAJ10AH?
All SMAJ10AH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ10AH, 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 SMAJ10AH part is unused and in its original packaging.
Return procedure for SMAJ10AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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