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Taiwan Semiconductor Corporation SMAJ75AH
- Part No.:
- SMAJ75AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75AH.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,077
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Product details
Overview
SMAJ75AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 75 V working stand-off voltage, 83.3–92.1 V breakdown voltage at 1 mA test current, 121 V maximum clamping voltage at 3.3 A peak impulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for automotive-grade DC/DC converters and industrial SMPS inputs.
For engineers reviewing the SMAJ75AH datasheet, SMAJ75AH pinout, SMAJ75AH application, or SMAJ75AH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, AEC-Q101 qualification status, DO-214AC package compatibility, and leakage current ≤1 µA at 75 V.
Technical Context
The SMAJ75AH operates as a unidirectional avalanche diode with glass-passivated junction, delivering sub-1 ps response time from 0 V to VBR min. Its clamping behavior follows standardized 10/1000 µs surge waveform compliance, with thermal derating above 25 °C per Fig.2 and peak power limited to 400 W at TA = 25 °C.
Designed for single-die configuration in DO-214AC (SMA) package, it supports automated placement and meets JESD201 Class 2 whisker resistance, J-STD-020 Level 1 moisture sensitivity, and UL 94V-0 flammability requirements - confirming suitability for high-reliability automotive and industrial PCB assemblies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VBR @ IT=1 mA | 83.3–92.1 V - Validated avalanche onset range ensuring predictable turn-on during transients |
| VC @ IPPM=3.3 A | 121 V - Clamped voltage limiting downstream circuit stress during 10/1000 µs surge |
| PPPM | 400 W - Peak pulse power handling capability per standard 10/1000 µs waveform |
| IR @ VWM | ≤1 µA - Low leakage preserves efficiency in high-impedance bias networks |
| TJ Range | −55 to +150 °C - Enables operation in under-hood automotive and industrial ambient environments |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band marking on one end; matte tin-plated leads compliant with J-STD-002 solderability; polarity-sensitive unidirectional device requiring correct orientation during placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or lowest potential node in protected circuit |
| Cathode | High-side surge input terminal | Connected to line being protected (e.g., +12 V rail); marked by band |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use including engine control units and body modules |
| Glass passivated junction | Enhances long-term reliability and stability of breakdown voltage under thermal cycling |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Fast response time <1 ps | Clamps ESD and fast-rising transients before sensitive ICs experience overstress |
Applications
| Automotive Power Rail Protection | Industrial SMPS Input Stage |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between power rail and chassis ground to clamp surges above 75 V. Use Value: Limits peak voltage to 121 V during 3.3 A 10/1000 µs pulses, preventing damage to MCU power supplies and CAN transceivers. | Use Scenario: Safeguarding primary-side rectifier outputs in offline AC/DC adapters. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing switching spikes from MOSFET turn-off and transformer leakage energy. Use Value: Withstands 400 W peak pulses while maintaining <1 µA leakage at 75 V, minimizing standby power loss. |
| On-board DC/DC Converter Input | LED Driver Supply Line |
Use Scenario: Input protection for buck converters powering ADAS sensors or infotainment subsystems. IC Role / Device Role / Timing Role: Fast-clamping unidirectional suppressor placed upstream of input filter capacitors. Use Value: Sub-1 ps response ensures clamping occurs before converter controller ICs experience latch-up or gate oxide stress. | Use Scenario: Overvoltage suppression on constant-current LED driver outputs exposed to cable disconnect events. IC Role / Device Role / Timing Role: Transient shunt across output terminals to absorb inductive kickback when load is disconnected. Use Value: 121 V clamping voltage prevents LED string overvoltage failure while supporting 150 °C junction temperature operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75A | Same VWM, VBR, and VC; identical DO-214AC package; non-AEC-Q101 rated | Lacks automotive qualification; not validated for ISO 7637-2 Pulse 1/2a/2b/3a/3b | Select SMAJ75A only for cost-sensitive industrial or consumer applications without automotive compliance needs. |
| SMBJ75A | Higher PPPM = 600 W; same VWM/VBR; larger DO-214AA (SMB) package | Requires PCB layout change due to 4.58 mm × 3.94 mm footprint vs. SMAJ75AH's 4.57 mm × 2.62 mm | Choose SMBJ75A when higher surge margin is required and board space allows larger package. |
Compared with SMAJ75A and SMBJ75A, the SMAJ75AH uniquely combines AEC-Q101 qualification, ISO 7637-2 compliance, and DO-214AC footprint - making it optimal for space-constrained automotive modules where qualification and reliability are mandatory.
Availability
SMAJ75AH is available at Aetrix Electronics and suitable for automotive power rail protection, industrial SMPS input stages, and on-board DC/DC converter inputs requiring stable component supply across production lifecycles.
Supply support for SMAJ75AH 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 global automotive, industrial, and computing markets since 1979.
The SMAJ series is part of TSC's AEC-Q101-qualified TVS portfolio, engineered specifically for robust transient immunity in harsh automotive electrical environments and demanding industrial power systems.
FAQ
What is the clamping voltage of SMAJ75AH under standard surge conditions?
The SMAJ75AH has a maximum clamping voltage (VC) of 121 V at 3.3 A peak impulse current with a 10/1000 µs waveform. This value is measured per JEDEC standards and ensures downstream components remain within safe operating limits during ISO 7637-2-compliant transients. The SMAJ75AH maintains this clamping performance across its full operating junction temperature range of −55 to +150 °C.
Is SMAJ75AH suitable for bidirectional transient protection?
No, SMAJ75AH is a unidirectional TVS diode intended for DC rail protection with defined anode-cathode polarity. For bidirectional applications, Taiwan Semiconductor specifies devices with CH or CAH suffixes (e.g., SMAJ75CH). Using SMAJ75AH in reverse-biased configurations risks premature failure due to lack of symmetric breakdown characteristics. Always verify polarity alignment in schematic and layout for SMAJ75AH.
Does SMAJ75AH meet automotive qualification standards?
Yes, SMAJ75AH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements. Its glass-passivated junction, JESD201 Class 2 whisker resistance, and J-STD-020 Level 1 moisture sensitivity rating further validate its suitability for automotive under-hood and cabin modules. These qualifications are documented in Taiwan Semiconductor's official A2102 datasheet revision for SMAJ75AH.
What is the maximum steady-state power dissipation for SMAJ75AH?
The SMAJ75AH has a steady-state power dissipation (PD) rating of 1 W at TA = 25 °C, derated linearly above that ambient temperature. This rating applies only to continuous DC or low-frequency reverse-bias conditions - not to transient events. During surge events, the device relies on its 400 W peak pulse power capability (10/1000 µs), not steady-state dissipation. Proper thermal design must ensure junction temperature stays within −55 to +150 °C for SMAJ75AH.
How does SMAJ75AH differ from SMAJ75H in terms of electrical performance?
SMAJ75AH offers tighter breakdown voltage tolerance (83.3–92.1 V) versus SMAJ75H (83.3–102 V), resulting in more consistent clamping behavior and lower VC (121 V vs. 134 V at same IPPM). Both share identical VWM (75 V), package (DO-214AC), and AEC-Q101 qualification. The "A" suffix denotes enhanced parameter distribution control, making SMAJ75AH preferable where precise clamping voltage is critical for system-level surge margin.
SMAJ75AH 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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 3.3A
- 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)
SMAJ75AH FAQ
1.How can I place an order for SMAJ75AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75AH 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 SMAJ75AH reliable?
The price and inventory of SMAJ75AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ75AH is usually 5 days.
3.What payment methods are accepted for SMAJ75AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75AH?
SMAJ75AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75AH 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 SMAJ75AH?
For technical support, including SMAJ75AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75AH requirements.
6.How does Aetrix verify that SMAJ75AH is sourced from the original manufacturer or authorized distributors?
All SMAJ75AH 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 SMAJ75AH meets industry standards.
7.What is the process for return or replacement of SMAJ75AH?
All SMAJ75AH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75AH, 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 SMAJ75AH part is unused and in its original packaging.
Return procedure for SMAJ75AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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