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Taiwan Semiconductor Corporation SMAJ8.0AH
- Part No.:
- SMAJ8.0AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.0AH.pdf
- Description:
- 400W, 9.4V, UNIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,992
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Product details
Overview
SMAJ8.0AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade overvoltage protection. It features a 8.0 V working stand-off voltage (VWM), 8.89–9.83 V breakdown voltage (VBR) at 1 mA test current, 13.6 V clamping voltage (VC) at 50 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - ideal for protecting DC/DC converters and automotive power rails against ISO 7637-2 pulses.
For engineers reviewing the SMAJ8.0AH datasheet, SMAJ8.0AH pinout, SMAJ8.0AH application, or SMAJ8.0AH equivalent, key selection criteria include clamping performance under 50 A surge, AEC-Q101 qualification status, unidirectional polarity marking, and compatibility with automated SMT assembly on high-reliability automotive PCBs.
Technical Context
The SMAJ8.0AH operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve fast response (<1.0 ps from 0 V to VBR min) and low leakage (<1 µA above 10 V). Its thermal design supports continuous operation up to TJ = +150 °C, with steady-state power dissipation of 1 W and peak forward surge current rating of 40 A (8.3 ms half-sine).
It meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b immunity requirements and is rated for moisture sensitivity level 1 (J-STD-020), enabling standard reflow without baking. Polarity is marked by cathode band; terminals are matte tin-plated and solderable per J-STD-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1 mA | 8.89–9.83 V - guaranteed avalanche initiation range, ensuring predictable turn-on |
| VC @ IPPM=50 A | 13.6 V - clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPPM (10/1000 µs) | 400 W - peak transient energy absorption capability at TA = 25°C |
| IR @ VWM | <1 µA - minimal leakage at rated stand-off, preserving system efficiency |
| TJ Range | −55 to +150 °C - qualified for under-hood automotive environments |
| AEC-Q101 | Qualified - validated for automotive electronic systems per stress test standard |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band marking; dual-leaded, gull-wing configuration optimized for automated placement and reflow soldering. Matte tin-plated leads meet J-STD-002 solderability requirements and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lower-potential rail; defines unidirectional conduction path |
| Cathode | Protected line input | Connected to supply rail or signal line; clamps transients toward anode when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics including engine control, body modules, and ADAS power supplies |
| Glass passivated junction | Enables stable VBR tolerance and long-term reliability under thermal cycling and humidity |
| Fast response time <1.0 ps | Clamps ESD and load-dump transients before sensitive ICs experience overstress |
| ISO 7637-2 compliance | Withstands standardized automotive transient waveforms (Pulse 1/2a/2b/3a/3b) without degradation |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow, reducing manufacturing overhead and process risk |
Applications
| Switching Mode Power Supply (SMPS) | Automotive On-Board DC/DC Converter |
|---|---|
Use Scenario: Protection of primary-side MOSFET gate drivers and secondary-side rectifiers against switching-induced voltage spikes and cross-talk. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input/output rails to clamp overshoots exceeding 8.0 V. Use Value: Limits VC to 13.6 V at 50 A surge, preventing latch-up or permanent damage to PWM controllers and synchronous rectifiers. | Use Scenario: Safeguarding 12 V-to-3.3 V/5 V buck converters powering infotainment microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Standoff-rated TVS on input rail to absorb ISO 7637-2 Pulse 1 (inductive load dump) and Pulse 3b (capacitive coupling noise). Use Value: AEC-Q101 qualification and 150 °C junction rating ensure uninterrupted operation in under-dash environments. |
| Lighting Application | Adapter Input Stage |
Use Scenario: Overvoltage protection for LED driver ICs in automotive headlamps and interior lighting modules subjected to battery transients. IC Role / Device Role / Timing Role: Unidirectional clamping device between battery feed and driver IC VDD pin. Use Value: Low IR (<1 µA) avoids standby current penalty; fast response prevents LED string flicker or driver reset during load dump. | Use Scenario: Input-stage surge suppression in wall adapters for consumer electronics, guarding AC-DC controller ICs. IC Role / Device Role / Timing Role: Primary-side TVS across bulk capacitor input to divert line surges before rectification. Use Value: 400 W peak pulse rating handles IEC 61000-4-5 Level 3 surges; DO-214AC footprint enables compact layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.0H | Higher VBR range (8.89–10.90 V); higher VC = 15.0 V at 50 A | Less precise clamping; marginally higher stress on protected ICs during surge | Select SMAJ8.0H only if tighter clamping voltage is not required and cost is prioritized |
| SMBJ8.0AH | Same VWM/VBR/VC specs but in larger DO-214AA (SMB) package; 600 W PPPM rating | Higher power handling but requires larger PCB area and different pad layout | Choose SMBJ8.0AH when system-level surge energy exceeds 400 W or thermal derating margin is critical |
Compared with SMAJ8.0H and SMBJ8.0AH, the SMAJ8.0AH delivers optimal balance of tight clamping (13.6 V), AEC-Q101 compliance, and DO-214AC space efficiency - making it preferred for space-constrained automotive DC/DC and adapter designs where precise overvoltage control is essential.
Availability
SMAJ8.0AH is available at Aetrix Electronics and suitable for automotive power management, industrial DC/DC conversion, and lighting applications requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SMAJ8.0AH 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, MOSFETs, and automotive-qualified components.
The SMAJ series was developed specifically for AEC-Q101-compliant transient suppression in harsh automotive environments, emphasizing robust clamping, low leakage, and SMT manufacturability in the DO-214AC package.
FAQ
What is the clamping voltage of SMAJ8.0AH at its rated peak pulse current?
The SMAJ8.0AH has a maximum clamping voltage (VC) of 13.6 V when subjected to a 50 A peak impulse current with a 10/1000 µs waveform. This value is measured per JEDEC standards and ensures downstream circuitry remains within safe operating limits during transient events such as load dump or ESD. The SMAJ8.0AH's low VC directly contributes to reliable protection of 3.3 V, 5 V, and 12 V logic and power ICs.
Is SMAJ8.0AH suitable for bidirectional transient suppression?
No, SMAJ8.0AH is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix and confirmed by its single cathode band marking. For bidirectional protection, select SMAJ8.0CH or SMAJ8.0CAH variants. Using SMAJ8.0AH in reverse-biased configurations may result in premature failure or inadequate clamping - always verify polarity alignment in schematic and layout for the SMAJ8.0AH.
Does SMAJ8.0AH meet automotive qualification standards?
Yes, SMAJ8.0AH is AEC-Q101 qualified and compliant with ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements. Its construction - including glass-passivated junction, MSL1 moisture rating, and −55 °C to +150 °C operating range - satisfies automotive electronics reliability benchmarks. The SMAJ8.0AH is widely deployed in engine control units, body control modules, and ADAS power supplies.
What is the maximum steady-state power dissipation for SMAJ8.0AH?
The SMAJ8.0AH has a maximum steady-state power dissipation (PD) of 1 W at TA = 25 °C, derated linearly above that ambient temperature per the pulse derating curve in the datasheet. This rating applies to continuous DC or low-frequency reverse-bias conditions - not transient events. For sustained overvoltage conditions beyond VWM, the SMAJ8.0AH will conduct and must be thermally managed accordingly.
How does SMAJ8.0AH differ from SMAJ8.0H in practical circuit protection?
SMAJ8.0AH offers tighter breakdown voltage tolerance (8.89–9.83 V vs. 8.89–10.90 V for SMAJ8.0H) and lower clamping voltage (13.6 V vs. 15.0 V at 50 A), resulting in reduced stress on protected ICs during transients. Both share the same DO-214AC package and AEC-Q101 qualification, but the SMAJ8.0AH's improved parametric consistency makes it preferable for designs demanding precise voltage threshold control - especially in automotive SMPS feedback paths or MCU supply rails.
SMAJ8.0AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 8V
- Voltage - Breakdown (Min):
- 8.89V
- Voltage - Clamping (Max) @ Ipp:
- 13.6V
- Current - Peak Pulse (10/1000µs):
- 29.4A
- 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)
SMAJ8.0AH FAQ
1.How can I place an order for SMAJ8.0AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.0AH 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 SMAJ8.0AH reliable?
The price and inventory of SMAJ8.0AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ8.0AH is usually 5 days.
3.What payment methods are accepted for SMAJ8.0AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.0AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.0AH?
SMAJ8.0AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.0AH 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 SMAJ8.0AH?
For technical support, including SMAJ8.0AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.0AH requirements.
6.How does Aetrix verify that SMAJ8.0AH is sourced from the original manufacturer or authorized distributors?
All SMAJ8.0AH 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 SMAJ8.0AH meets industry standards.
7.What is the process for return or replacement of SMAJ8.0AH?
All SMAJ8.0AH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.0AH, 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 SMAJ8.0AH part is unused and in its original packaging.
Return procedure for SMAJ8.0AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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