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Taiwan Semiconductor Corporation SMAJ7.5
- Part No.:
- SMAJ7.5
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5.pdf
- Description:
- 400W, 9.3V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:8,109
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Product details
Overview
SMAJ7.5 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping fast-rising ESD and surge transients in DC power lines. It features 8.33–10.30 V breakdown voltage (VBR), 7.5 V working stand-off voltage (VWM), 14.3 V maximum clamping voltage (VC) at 100 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMAJ7.5 datasheet, SMAJ7.5 pinout, SMAJ7.5 application, or SMAJ7.5 equivalent, key selection criteria include its low clamping ratio (VC/VBR ≈ 1.45), sub-1 ps response time, <1 µA reverse leakage at VWM, compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b, and suitability for automotive and industrial DC/DC converter protection where precise voltage thresholding and robust surge immunity are required.
Technical Context
The SMAJ7.5 operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified VBR range (8.33–10.30 V at 1 mA test current). Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA at 7.5 V).
Under a standardized 10/1000 µs surge waveform, it clamps to ≤14.3 V at 100 A peak impulse current, delivering 400 W peak pulse power capability - derated linearly above 25°C ambient per Fig.2. It supports operating junction temperatures from –55°C to +150°C and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC bias margin for 5 V–7 V nominal systems. |
| VBR @ IT=1 mA | 8.33–10.30 V - Verified avalanche breakdown range; ensures reliable triggering across process variation and temperature. |
| VC @ IPPM=100 A | ≤14.3 V - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to safe levels in 12 V rail protection. |
| PPPM | 400 W - Peak pulse power handling with 10/1000 µs waveform; sufficient for ISO 7637-2 Pulse 1 (inductive load dump) and Pulse 2b (battery disconnect). |
| IR @ VWM | <1 µA - Ultra-low reverse leakage at rated stand-off; minimizes quiescent power loss in always-on battery-backed circuits. |
| Response Time | <1.0 ps - Sub-picosecond junction response enables effective suppression of ESD events (IEC 61000-4-2) and fast transients. |
Pinout & Package
DO-214AC (SMA) surface-mount package: molded epoxy case with matte tin-plated leads, polarity indicated by cathode band, weight ≈ 0.060 g, moisture sensitivity level (MSL) 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (non-banded end) | Forward current input / Surge return path | Connected to protected line's low-side or ground reference; completes clamping loop during transient events. |
| Cathode (banded end) | Reverse-biased clamping node | Connected to the line under protection (e.g., +12 V rail); conducts avalanche current when VREV > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive power-line surge immunity without external filtering components in standard 12 V systems. |
| 10/1000 µs waveform rating | Matches real-world load-dump and inductive-switching surge profiles; enables direct comparison with system-level test requirements. |
| Halogen-free & RoHS-compliant | Fulfills environmental compliance mandates for automotive and industrial end equipment without compromising electrical performance. |
Applications
| Automotive Body Control Module (BCM) | Industrial DC/DC Converter Input Stage |
|---|---|
Use Scenario: Protects microcontroller I/O and CAN transceiver power rails against load-dump surges during alternator regulation faults. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between 12 V supply and ground, activated within <1 ps upon overvoltage detection. Use Value: Limits transient voltage to ≤14.3 V at 100 A, preventing latch-up or gate oxide damage in 3.3 V/5 V logic interfaces powered from local LDOs. |
Use Scenario: Shields primary-side controller ICs and MOSFET gates in isolated flyback converters subjected to input capacitor discharge transients. IC Role / Device Role / Timing Role: Standoff protector on 24 V input rail; absorbs energy from reflected spikes caused by transformer leakage inductance. Use Value: Delivers 400 W peak pulse power handling with 7.5 V VWM, enabling use in 24 V systems with ≥10 V design margin before clamping onset. |
| LED Driver Power Supply | USB-C PD Adapter Secondary Side |
Use Scenario: Suppresses switching noise and inductive kickback from constant-current buck drivers powering high-brightness LED arrays. IC Role / Device Role / Timing Role: Fast-response clamp on output capacitor node; shunts transient energy away from LED string and current-sense amplifier. Use Value: Achieves ≤14.3 V clamping at 100 A, maintaining LED forward voltage integrity and avoiding false overvoltage shutdown in analog dimming control loops. |
Use Scenario: Guards secondary-side synchronous rectifier controllers and optocoupler feedback paths against cross-conduction surges during USB-C PD negotiation bursts. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) standoff protector on 5–20 V negotiated output rails; prevents false triggering during dynamic voltage transitions. Use Value: Maintains <1 µA IR at 7.5 V VWM, eliminating standby current penalty while ensuring sub-1 ps response to 8 kV ESD events on CC lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5A | Narrower VBR range (8.33–9.21 V), tighter 10% tolerance; lower VC = 12.9 V at 100 A. | Better suited for precision-clamp designs requiring minimal overvoltage margin, e.g., 5 V logic rail protection with tight VDD tolerance. | Select SMAJ7.5A when clamping voltage headroom is critical and tighter VBR distribution improves yield in high-volume production. |
| SMBJ7.5 | Same VWM/VBR/VC specs but in larger DO-214AA (SMB) package; higher PPPM = 600 W. | Preferred for higher-energy surge environments (e.g., industrial motor drives) where PCB space allows larger footprint and thermal mass. | Choose SMBJ7.5 only if layout permits DO-214AA and system-level testing requires >400 W surge handling - not a drop-in replacement due to different pad layout and thermal profile. |
Compared with SMAJ7.5, SMAJ7.5A offers tighter VBR control and lower clamping voltage for sensitive 5 V domains, while SMBJ7.5 provides higher surge energy capacity in a physically larger package - neither is pin-compatible, and both require board-level validation for thermal dissipation and layout clearance.
Availability
SMAJ7.5 is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC/DC converters, LED lighting drivers, and USB-C PD adapter designs requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ7.5 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, with global distribution and AEC-Q101 qualified product lines.
The SMAJ series was developed specifically for high-reliability transient suppression in automotive and industrial power systems, emphasizing fast response, low clamping voltage, and robust surge endurance in compact surface-mount packages.
FAQ
What is the maximum clamping voltage of the SMAJ7.5 under standard surge conditions?
The SMAJ7.5 exhibits a maximum clamping voltage (VC) of 14.3 V when subjected to a 100 A peak impulse current with a 10/1000 µs waveform. This value is measured per standard test conditions (TA = 25°C) and represents the upper limit of voltage seen by downstream circuitry during surge events - critical for ensuring compatibility with 12 V system ICs rated for ≤16 V absolute maximum.
Is the SMAJ7.5 suitable for bidirectional transient protection?
No, the SMAJ7.5 is a unidirectional TVS diode, intended for protection of DC power lines with defined polarity. For bidirectional applications such as AC signal lines or data buses, the SMAJ7.5A variant is not applicable; instead, bipolar parts like SMAJ7.5CA (with 'CA' suffix) must be used - the SMAJ7.5 itself lacks symmetrical breakdown characteristics in forward and reverse directions.
What is the reverse leakage current specification for SMAJ7.5 at its working voltage?
The SMAJ7.5 specifies a maximum reverse leakage current (IR) of less than 1 µA when biased at its rated working stand-off voltage (VWM) of 7.5 V. This ultra-low leakage ensures negligible power drain in battery-operated or always-on systems, supporting long-term reliability in automotive infotainment and telematics modules where standby current budgets are tightly constrained.
Does the SMAJ7.5 meet automotive surge immunity standards?
Yes, the SMAJ7.5 is explicitly validated to meet ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a (sudden load removal), Pulse 2b (battery disconnection), and Pulses 3a/3b (switching noise), making it suitable for front-end protection in automotive ECUs, body control units, and ADAS power supplies without additional external filtering components.
What package type and mounting method does the SMAJ7.5 use?
The SMAJ7.5 uses the DO-214AC (SMA) surface-mount package with matte tin-plated leads compatible with standard reflow soldering per J-STD-002. Its compact footprint, cathode band marking, and MSL Level 1 rating enable automated placement and high-yield assembly in high-volume automotive and industrial manufacturing lines without baking or special handling.
SMAJ7.5 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):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 14.3V
- Current - Peak Pulse (10/1000µs):
- 28A
- 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)
SMAJ7.5 FAQ
1.How can I place an order for SMAJ7.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5 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 SMAJ7.5 reliable?
The price and inventory of SMAJ7.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.5 is usually 5 days.
3.What payment methods are accepted for SMAJ7.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5?
SMAJ7.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5 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 SMAJ7.5?
For technical support, including SMAJ7.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5 requirements.
6.How does Aetrix verify that SMAJ7.5 is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5 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 SMAJ7.5 meets industry standards.
7.What is the process for return or replacement of SMAJ7.5?
All SMAJ7.5 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5, 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 SMAJ7.5 part is unused and in its original packaging.
Return procedure for SMAJ7.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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