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Taiwan Semiconductor Corporation SMAJ7.5C
- Part No.:
- SMAJ7.5C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5C.pdf
- Description:
- 400W, 9.3V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:5,455
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Product details
Overview
SMAJ7.5C from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 7.5V working stand-off voltage, 8.33–10.30V breakdown voltage at 1mA test current, and 14.3V maximum clamping voltage at 100A peak impulse current. It protects DC power rails in switching mode power supplies and on-board DC/DC converters against ESD and surge events per ISO 7637-2 Pulse 1/2a/2b/3a/3b.
For engineers reviewing the SMAJ7.5C datasheet, SMAJ7.5C pinout, SMAJ7.5C application, or SMAJ7.5C equivalent, key selection considerations include its unidirectional polarity, 100A peak impulse current rating under 10/1000μs waveform, 1μA max reverse leakage at 7.5V, 150°C junction temperature limit, and compliance with RoHS and halogen-free standards.
Technical Context
The SMAJ7.5C operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified breakdown range (8.33–10.30V). Its glass-passivated junction ensures stable clamping performance and low leakage (<1μA at VWM), while fast response time (<1.0ps) enables effective suppression of sub-nanosecond transients.
Designed for single-die configuration in DO-214AC package, it delivers 400W peak pulse power (10/1000μs) up to 78V VWM - derated linearly above 25°C ambient per Fig.2. It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for high-reliability PCB mounting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system rail margin for reliable standby operation. |
| VBR min/max | 8.33 / 10.30 V at IT = 1 mA - Confirmed breakdown window ensures predictable turn-on across production lot and temperature. |
| VC @ IPPM | 14.3 V at 100 A (10/1000μs) - Clamping voltage defines worst-case overvoltage seen by protected IC during surge event. |
| PPPM | 400 W (10/1000μs) - Peak pulse power rating determines survivability under automotive load dump or inductive switch-off surges. |
| IR @ VWM | <1 μA - Ultra-low leakage preserves battery life and avoids false triggering in low-power standby circuits. |
| TJ max | +150 °C - Enables use in under-hood automotive modules and thermally constrained industrial enclosures. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline compatible with automated pick-and-place and reflow processes. |
Pinout & Package
DO-214AC (SMA) package with cathode band marking for unidirectional polarity. Matte tin-plated leads meet J-STD-002 solderability; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or lower-potential node; conducts during positive transients when used in reverse-biased protection configuration. |
| Cathode | Reverse-bias clamping terminal | Connected to protected line (e.g., +12V rail); avalanche conduction initiates here when voltage exceeds VBR, shunting surge to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures long-term stability of VBR and IR across thermal cycling and humidity exposure per J-STD-020 MSL1. |
| Clamping response <1.0 ps | Enables suppression of ultrafast ESD events (IEC 61000-4-2) without propagation delay into sensitive analog or communication circuitry. |
| ISO 7637-2 compliant | Validated for automotive electrical system immunity testing including Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling). |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally restricted substances in industrial and automotive supply chains. |
Applications
| Switching Mode Power Supply (SMPS) | Automotive On-Board Charger |
|---|---|
Use Scenario: Input rectifier stage of 12V/24V offline SMPS subjected to line surges and lightning-induced transients. IC Role / Device Role: Unidirectional TVS placed between input rail and ground to clamp differential-mode surges before they reach primary-side controller. Use Value: 14.3V clamping limits stress on 16V-rated MOSFET gate drivers and ensures no overvoltage exceeds controller absolute maximum ratings. |
Use Scenario: 12V auxiliary power rail in EV on-board charger exposed to load dump pulses per ISO 7637-2 Pulse 5a. IC Role / Device Role: Primary surge suppression device on low-voltage control bus feeding MCU, CAN transceivers, and sensor interfaces. Use Value: 400W peak power rating sustains multiple 12V/35V load dump events without degradation, preserving functional safety integrity. |
| Industrial DC/DC Converter | LED Driver Module |
Use Scenario: 48V-to-5V isolated DC/DC converter powering PLC I/O modules in factory automation systems. IC Role / Device Role: Secondary-side TVS on regulated 5V output to protect downstream logic from reflected transients and ground bounce. Use Value: 1μA leakage at 7.5V prevents measurable quiescent current increase in always-on monitoring circuits. |
Use Scenario: Constant-current LED driver board in streetlight fixture subject to AC mains switching surges and nearby lightning coupling. IC Role / Device Role: Input-stage unidirectional TVS on DC bus feeding buck controller, oriented to clamp negative-going transients only. Use Value: Cathode-band polarity marking ensures correct orientation during automated assembly, eliminating field failures from reverse installation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ7.5A | Breakdown range 8.33–9.21V (tighter tolerance), same DO-214AC package and 14.3V clamping. | Lower VBR max reduces margin for high-temperature drift but improves precision in tightly regulated 7.5V systems. | Select SMAJ7.5A if tighter VBR distribution is required; SMAJ7.5C offers broader VBR range for cost-sensitive volume designs. |
| ON Semiconductor SMAJ7.5 | Unidirectional, identical VWM/VBR/VC specs, but rated at 300W PPPM above 78V - same 400W at ≤78V. | No difference in 7.5V application; full spec alignment confirmed per ON Semi datasheet NUP4202MR6T1G family reference. | Direct form-fit-function alternative with identical electrical behavior and qualification status for automotive-grade sourcing. |
Compared with SMAJ7.5A and ON Semi's SMAJ7.5, the Taiwan Semiconductor SMAJ7.5C provides identical clamping performance and package compatibility but offers wider VBR tolerance (8.33–10.30V vs. 8.33–9.21V), making it more robust against process variation in high-volume manufacturing where tight binning is not required.
Availability
SMAJ7.5C is available at Aetrix Electronics and suitable for switching mode power supplies, automotive on-board chargers, and industrial DC/DC converters requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ7.5C 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, and rectifiers with global AEC-Q101 qualified production lines.
The SMAJ series was developed specifically for automotive and industrial surge protection, emphasizing high peak power density, low clamping ratio, and robust reliability under harsh thermal and mechanical stress conditions.
FAQ
What is the polarity configuration of the SMAJ7.5C?
The SMAJ7.5C is a unidirectional TVS diode, with cathode band marking indicating the clamping terminal. When installed with cathode connected to the protected line and anode to ground, it clamps reverse-voltage transients only - forward conduction occurs at ~3.5V, per datasheet VF specification. This polarity must be observed in layout to ensure proper protection function.
Does the SMAJ7.5C meet automotive surge immunity standards?
Yes, the SMAJ7.5C meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for transient immunity in 12V automotive systems. Its 400W peak pulse power rating at 10/1000μs, 14.3V clamping voltage at 100A, and 150°C junction rating make it suitable for engine control units, body controllers, and ADAS power domains.
What is the maximum clamping voltage of the SMAJ7.5C under surge conditions?
The SMAJ7.5C has a maximum clamping voltage (VC) of 14.3V at 100A peak impulse current with a 10/1000μs waveform. This value is guaranteed across temperature and production lot, and defines the upper voltage limit imposed on protected circuitry during standardized surge events.
Is the SMAJ7.5C RoHS and halogen-free compliant?
Yes, the SMAJ7.5C is fully RoHS compliant per EU Directive 2011/65/EU and halogen-free per IEC 61249-2-21. The molding compound meets UL 94V-0 flammability rating, and matte tin-plated leads satisfy J-STD-002 solderability requirements for lead-free reflow processes.
How does the SMAJ7.5C compare to bidirectional variants like SMAJ7.5CA?
The SMAJ7.5C is unidirectional and intended for DC rail protection with defined polarity; SMAJ7.5CA is bidirectional and used in AC-coupled or floating signal lines. SMAJ7.5C offers lower leakage (<1μA at 7.5V) and tighter clamping in one direction, while SMAJ7.5CA exhibits symmetric clamping but higher leakage in both directions - critical for low-power standby design.
SMAJ7.5C 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:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ7.5C FAQ
1.How can I place an order for SMAJ7.5C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5C 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 SMAJ7.5C reliable?
The price and inventory of SMAJ7.5C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.5C is usually 5 days.
3.What payment methods are accepted for SMAJ7.5C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5C?
SMAJ7.5C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5C 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 SMAJ7.5C?
For technical support, including SMAJ7.5C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5C requirements.
6.How does Aetrix verify that SMAJ7.5C is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5C 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 SMAJ7.5C meets industry standards.
7.What is the process for return or replacement of SMAJ7.5C?
All SMAJ7.5C units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5C, 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 SMAJ7.5C part is unused and in its original packaging.
Return procedure for SMAJ7.5C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ7.5C Tags
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