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Taiwan Semiconductor Corporation SMAJ8.0A
- Part No.:
- SMAJ8.0A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.0A.pdf
- Description:
- TVS DIODE 8VWM 13.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,247
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Product details
Overview
SMAJ8.0A 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 8.0 V working stand-off voltage (VWM), 8.89–9.83 V breakdown voltage (VBR) at 1 mA, 13.6 V maximum clamping voltage (VC) at 50 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - ideal for protecting SMPS inputs and DC/DC converter outputs against ESD and surge events.
For engineers reviewing the SMAJ8.0A datasheet, SMAJ8.0A pinout, SMAJ8.0A application, or SMAJ8.0A equivalent, key selection criteria include clamping performance under 50 A surge, low leakage (<1 µA @ 8 V), DO-214AC package compatibility with automated assembly, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics.
Technical Context
The SMAJ8.0A operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its specified breakdown range (8.89–9.83 V). Its glass-passivated junction ensures stable VBR tolerance and low leakage, while sub-1 ps response time enables effective suppression of fast transients including ESD per IEC 61000-4-2.
Designed for single-die configuration in DO-214AC (SMA) package, it delivers 400 W peak pulse power at 25°C - derated linearly above that ambient - and supports steady-state power dissipation up to 1 W. Polarity is marked by cathode band; forward voltage is 3.5 V at 25 A, confirming suitability for high-current surge handling without latch-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 8.89 V / 9.83 V @ 1 mA - tight breakdown window ensures predictable turn-on threshold |
| VC @ IPPM | 13.6 V @ 50 A - low clamping voltage limits protected circuit stress during 10/1000 µs surge |
| PPPM | 400 W (10/1000 µs) - sufficient for ISO 7637-2 Pulse 1 and Pulse 2b automotive transients |
| IR @ VWM | <1 µA - negligible standby leakage preserves battery life in always-on systems |
| TJ max | +150 °C - enables operation in under-hood automotive and industrial environments |
| Package | DO-214AC (SMA) - industry-standard SMD outline compatible with IPC-7351B footprint |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band on cathode end. Weight ≈ 0.060 g. Meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND) in unidirectional configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., +V rail); conducts during overvoltage to shunt energy to ground |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over temperature and lifetime, minimizing parameter drift in harsh environments |
| Sub-1 ps response time | Enables suppression of nanosecond-scale ESD events before downstream ICs are damaged |
| ISO 7637-2 compliance | Validated for automotive load dump and switching transient immunity (Pulse 1/2a/2b/3a/3b) |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow - supports standard SMT assembly without special handling |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Switching Mode Power Supply (SMPS) Input Protection | On-Board DC/DC Converter Rail Clamping |
|---|---|
Use Scenario: Installed across AC-DC adapter input or offline SMPS bulk capacitor to absorb line surges and lightning-induced transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode clamping reverse transients on primary-side rectified rail. Use Value: Limits peak voltage to ≤13.6 V during 50 A 10/1000 µs surge, preventing MOSFET gate oxide failure and bulk capacitor overvoltage. | Use Scenario: Placed at output of isolated 12 V → 3.3 V DC/DC module powering microcontroller peripherals. IC Role / Device Role / Timing Role: Standoff-rated protector absorbing coupled noise from adjacent switching stages or hot-swap events. Use Value: Clamps output rail to safe levels within 1 ps, maintaining <1 µA leakage to avoid loading low-power sleep modes. |
| Automotive Body Control Module (BCM) Inputs | Industrial Sensor Interface Protection |
Use Scenario: Protecting LIN bus or switch inputs in BCMs exposed to battery disconnect/load dump pulses. IC Role / Device Role / Timing Role: Unidirectional transient suppressor referenced to chassis ground on 12 V supply lines. Use Value: Withstands ISO 7637-2 Pulse 2b (inductive switch-off) and Pulse 5a (load dump) without degradation. | Use Scenario: Guarding analog sensor inputs (e.g., 4–20 mA loop receivers) in factory automation PLCs. IC Role / Device Role / Timing Role: Low-leakage standoff device limiting induced surges from nearby motor drives or relay coils. Use Value: Maintains signal integrity with <1 µA IR at 8 V, avoiding offset errors in precision current-to-voltage conversion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.0 | Higher clamping voltage (15.0 V @ 50 A) and wider VBR range (8.89–10.90 V) | Less stringent voltage margin for sensitive 3.3 V or 5 V logic rails | Select SMAJ8.0A when tighter clamping and lower VBR max are required to protect low-voltage ICs |
| SMBJ8.0A | Same electrical specs but in larger DO-214AA (SMB) package; 600 W PPPM rating | Higher power handling and thermal mass, but requires larger PCB footprint | Choose SMBJ8.0A for higher surge repetition rates or elevated ambient temperatures where DO-214AC thermal limits may be exceeded |
Compared with SMAJ8.0 and SMBJ8.0A, the SMAJ8.0A offers the optimal balance of compact DO-214AC packaging, 13.6 V clamping headroom for 3.3 V/5 V systems, and verified ISO 7637-2 compliance - making it preferred for space-constrained automotive and industrial DC rail protection.
Availability
SMAJ8.0A is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and automotive body control modules requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ8.0A 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for industrial, automotive, and consumer applications.
The SMAJ series was developed specifically for high-reliability surface-mount surge protection in automotive and industrial power systems, emphasizing tight parametric control, AEC-Q101 readiness, and robust surge endurance in DO-214AC packaging.
FAQ
What is the clamping voltage of SMAJ8.0A under a 50 A 10/1000 µs surge?
The SMAJ8.0A 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 standard test conditions (TA = 25°C) and guarantees that protected circuits experience no more than 13.6 V during such transient events - critical for safeguarding 3.3 V or 5 V logic interfaces. The SMAJ8.0A datasheet specifies this parameter directly in its Electrical Specifications table.
Is SMAJ8.0A unidirectional or bidirectional?
SMAJ8.0A is a unidirectional transient voltage suppressor, intended for use in polarity-defined DC circuits. Its cathode band marking indicates the terminal to connect toward the protected line (e.g., +V rail), with anode tied to ground. Bidirectional variants carry "CA" suffixes (e.g., SMAJ8.0CA); the "A" in SMAJ8.0A denotes tighter VBR tolerance, not polarity - confirmed by its single VWM rating (8.0 V) and absence of symmetrical breakdown data.
Does SMAJ8.0A meet automotive surge immunity standards?
Yes, SMAJ8.0A meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (inductive switch-off), Pulse 3a/3b (capacitive coupling), and is rated for operation up to +150 °C junction temperature - aligning with automotive under-hood and body electronics requirements. Its glass-passivated junction and moisture sensitivity level 1 further support robust automotive manufacturing flow.
What is the maximum leakage current of SMAJ8.0A at its working voltage?
The SMAJ8.0A exhibits a maximum reverse leakage current (IR) of less than 1 µA when biased at its 8.0 V working stand-off voltage (VWM), tested at TA = 25°C. This ultra-low leakage preserves battery runtime in always-on systems and avoids signal path errors in high-impedance sensor interfaces - a key differentiator from higher-leakage alternatives like SMAJ8.0 (IR < 5 µA).
Can SMAJ8.0A be used in place of SMAJ8.0 in existing designs?
Yes, SMAJ8.0A is a direct replacement for SMAJ8.0 in most applications due to identical DO-214AC (SMA) package, pinout, and mounting footprint. However, SMAJ8.0A offers tighter VBR (8.89–9.83 V vs. 8.89–10.90 V) and lower clamping voltage (13.6 V vs. 15.0 V), improving protection margin for low-voltage ICs. No PCB changes are required, but system-level validation of clamping behavior under worst-case surge is recommended.
SMAJ8.0A 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):
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ8.0A FAQ
1.How can I place an order for SMAJ8.0A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.0A 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 SMAJ8.0A reliable?
The price and inventory of SMAJ8.0A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ8.0A is usually 5 days.
3.What payment methods are accepted for SMAJ8.0A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.0A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.0A?
SMAJ8.0A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.0A 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 SMAJ8.0A?
For technical support, including SMAJ8.0A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.0A requirements.
6.How does Aetrix verify that SMAJ8.0A is sourced from the original manufacturer or authorized distributors?
All SMAJ8.0A 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 SMAJ8.0A meets industry standards.
7.What is the process for return or replacement of SMAJ8.0A?
All SMAJ8.0A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.0A, 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 SMAJ8.0A part is unused and in its original packaging.
Return procedure for SMAJ8.0A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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