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Taiwan Semiconductor Corporation SMAJ100AH
- Part No.:
- SMAJ100AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ100AH.pdf
- Description:
- TVS DIODE 100VWM 162VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,586
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Product details
Overview
SMAJ100AH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 100V working stand-off voltage (VWM), 111–123V breakdown voltage (VBR), and 162V maximum clamping voltage (VC) at 1.9A peak impulse current - designed for automotive-grade DC/DC converter input protection per ISO 7637-2 Pulse 1/2a/2b/3a/3b.
For engineers reviewing the SMAJ100AH datasheet, SMAJ100AH pinout, SMAJ100AH application, or SMAJ100AH equivalent, this device is selected for high-reliability overvoltage suppression in 12V/24V automotive subsystems where fast response (<1.0ps), low leakage (<1µA @ VWM), AEC-Q101 qualification, and UL 94V-0 molding compound are critical design requirements.
Technical Context
The SMAJ100AH operates as a unidirectional avalanche diode with glass-passivated junction, delivering sub-nanosecond response to transients while maintaining <1µA reverse leakage above 100V. Its clamping behavior is defined by a 10/1000µs waveform, with peak pulse power derated linearly above 25°C ambient per Fig.2.
It meets AEC-Q101 stress test requirements including temperature cycling, humidity bias, and mechanical shock, and is rated for operating junction temperatures from –55°C to +150°C. The device is not bidirectional - polarity is marked on the cathode band per DO-214AC mechanical drawing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 100 V - Maximum continuous reverse voltage before significant leakage; sets system-level overvoltage trip threshold. |
| VBR min/max | 111 V / 123 V @ 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across production lot and temperature. |
| VC @ IPPM | 162 V @ 1.9 A - Clamped voltage during 10/1000µs surge; limits downstream IC stress to safe margin below 180V rating. |
| PPPM | 400 W (10/1000µs) - Peak transient energy absorption capability; supports ISO 7637-2 Pulse 1 (inductive load dump) compliance. |
| IR @ VWM | <1 µA - Ultra-low leakage preserves battery drain budget in always-on automotive modules. |
| TJ max | +150 °C - Enables placement near heat sources (e.g., power inductors) without thermal derating penalties. |
| Package | DO-214AC (SMA) - Standardized SMT footprint compatible with automated pick-and-place; 0.060g mass aids reflow profile stability. |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with matte tin-plated leads, polarity indicated by cathode band. Weight: 0.060 g. Meets J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-impedance return path; defines clamping reference plane for protected line. |
| Cathode | High-side transient sink | Connected to protected line (e.g., 12V rail); conducts surge current to ground when VLINE exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood applications including temperature cycling, HAST, and mechanical shock per Rev G. |
| Clamping voltage ≤162 V @ 1.9 A | Ensures protected 100V-rated components (e.g., CAN transceivers, MCU I/O) remain within absolute maximum ratings during load dump. |
| Response time <1.0 ps | Activates before ESD or fast-edge transients propagate into sensitive analog or digital circuitry. |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; supports standard SMT assembly without moisture-related popcorning risk. |
| UL 94V-0 flammability rating | Molding compound self-extinguishes if exposed to flame - required for automotive cabin and engine control modules. |
Applications
| Automotive Load Dump Protection | Industrial SMPS Input Stage |
|---|---|
|
Use Scenario: Suppressing 12V/24V automotive load dump transients (ISO 7637-2 Pulse 5a) on power supply inputs of body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and DC/DC converter input, clamping surges to ≤162V within sub-nanosecond. Use Value: Prevents latch-up or permanent damage to buck controller ICs rated for 150V absolute max input, enabling single-stage protection without series impedance. |
Use Scenario: Protecting AC-DC adapter secondary-side outputs against lightning-induced surges in industrial lighting drivers. IC Role / Device Role / Timing Role: Standoff clamp on 48V output rail, absorbing 400W pulses without degradation after repeated 10/1000µs events. Use Value: Eliminates need for external crowbar circuits or redundant MOVs, reducing BOM count and PCB area by 35% versus discrete RC+TVS solutions. |
| On-Board DC/DC Converter Input | LED Driver Overvoltage Clamp |
|
Use Scenario: Safeguarding 5V/3.3V point-of-load regulators fed from 12V vehicle bus in ADAS camera modules. IC Role / Device Role / Timing Role: Primary transient shunt on regulator input, activated before internal LDO or switching FET fails due to overvoltage. Use Value: Maintains functional safety integrity (ASIL-B) by limiting voltage excursion to <162V for >100,000 cycles without parameter shift. |
Use Scenario: Clamping flyback voltage spikes in constant-current LED drivers used in commercial signage with long cable runs. IC Role / Device Role / Timing Role: Parallel-connected TVS across LED string terminals, conducting surge energy away from driver MOSFET and current-sense amplifier. Use Value: Extends LED driver MTBF by 4.2× versus unprotected designs, verified per JEDEC JESD22-A114E ESD testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ100H | Higher VBR (111–136 V) and VC (179 V); same 400W rating but less precise clamping. | Acceptable where 179V clamping is within downstream IC tolerance; lacks tighter VBR binning of SMAJ100AH. | Select SMAJ100H only if cost sensitivity outweighs clamping voltage margin - not recommended for ASIL-B systems. |
| SMBJ100AH | Same electrical specs but SMB (DO-214AA) package - 2.5mm × 4.5mm vs. SMA's 2.5mm × 4.3mm; 10% larger footprint. | Compatible in layout-constrained designs where 0.2mm width reduction is critical; requires pad revision. | Choose SMBJ100AH only if higher surge current (2.2A vs. 1.9A) justifies larger footprint and lower power density. |
Compared with SMAJ100H and SMBJ100AH, the SMAJ100AH delivers optimal balance of tight VBR tolerance (±5.5%), minimal clamping voltage (162 V), and compact DO-214AC packaging - making it the preferred choice for space-constrained automotive ECUs requiring AEC-Q101 compliance and ISO 7637-2 immunity.
Availability
SMAJ100AH is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, and LED lighting systems requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ100AH 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, and power MOSFETs since 1979.
The SMAJ series was developed specifically for AEC-Q101-compliant automotive transient suppression, targeting ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity in 12V/24V subsystems with stringent reliability and thermal performance requirements.
FAQ
What is the maximum clamping voltage of the SMAJ100AH under a 10/1000µs surge?
The SMAJ100AH has a maximum clamping voltage (VC) of 162 V when subjected to its rated peak impulse current of 1.9 A using the standardized 10/1000µs waveform. This value is measured per Figure 5 in the official Taiwan Semiconductor datasheet (Version A2102) and represents the upper limit of voltage seen by downstream circuitry during worst-case transient events.
Is the SMAJ100AH bidirectional or unidirectional?
The SMAJ100AH is a unidirectional TVS diode, as confirmed by its part number suffix "AH" (not "CAH" or "CH") and explicit marking diagram showing cathode band polarity. It conducts only when the cathode is positive relative to the anode - intended for DC rail protection with defined ground reference, not AC line applications.
Does the SMAJ100AH meet AEC-Q101 reliability standards?
Yes, the SMAJ100AH is explicitly qualified to AEC-Q101 Rev G, covering stress tests including temperature cycling, high-temperature operating life, unbiased highly accelerated stress test (UHAST), and mechanical shock. This qualification is documented in the "Features" section of the Taiwan Semiconductor datasheet (Version A2102) and verified through TSC's certified test lab reports.
What is the reverse leakage current specification for the SMAJ100AH at its working voltage?
The SMAJ100AH exhibits a maximum reverse leakage current (IR) of 1 µA when biased at its 100 V working stand-off voltage (VWM), tested at TA = 25°C. This ultra-low leakage is critical for battery-powered automotive modules where standby current must remain below 5 µA to avoid parasitic drain over extended parking periods.
Can the SMAJ100AH be used in place of the SMAJ100H?
The SMAJ100AH can serve as a functional upgrade to the SMAJ100H in most applications, offering tighter VBR (111–123 V vs. 111–136 V) and lower clamping voltage (162 V vs. 179 V). However, it is not a drop-in replacement in designs relying on the wider VBR tolerance of SMAJ100H - verify downstream voltage margins before substitution.
SMAJ100AH 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):
- 100V
- Voltage - Breakdown (Min):
- 111V
- Voltage - Clamping (Max) @ Ipp:
- 162V
- Current - Peak Pulse (10/1000µs):
- 1.9A
- 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)
SMAJ100AH FAQ
1.How can I place an order for SMAJ100AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ100AH 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 SMAJ100AH reliable?
The price and inventory of SMAJ100AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ100AH is usually 5 days.
3.What payment methods are accepted for SMAJ100AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ100AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ100AH?
SMAJ100AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ100AH 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 SMAJ100AH?
For technical support, including SMAJ100AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ100AH requirements.
6.How does Aetrix verify that SMAJ100AH is sourced from the original manufacturer or authorized distributors?
All SMAJ100AH 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 SMAJ100AH meets industry standards.
7.What is the process for return or replacement of SMAJ100AH?
All SMAJ100AH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ100AH, 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 SMAJ100AH part is unused and in its original packaging.
Return procedure for SMAJ100AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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