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Taiwan Semiconductor Corporation SMAJ7.5H
- Part No.:
- SMAJ7.5H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5H.pdf
- Description:
- 400W, 9.3V, UNIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,284
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Product details
Overview
SMAJ7.5H from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails. It features a 7.5 V working stand-off voltage (VWM), 8.33–10.30 V breakdown voltage (VBR), 14.3 V clamping voltage (VC) at 100 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - deployed in automotive-grade SMPS, on-board DC/DC converters, and lighting drivers.
For engineers reviewing the SMAJ7.5H datasheet, SMAJ7.5H pinout, SMAJ7.5H application, or SMAJ7.5H equivalent, this page delivers verified electrical parameters, DO-214AC package details, AEC-Q101 qualification status, ISO 7637-2 compliance, and real-world clamping performance data to support ESD/surge protection design validation and component selection.
Technical Context
The SMAJ7.5H operates as a unidirectional avalanche diode with glass-passivated junction, optimized for fast response (<1.0 ps from 0 V to VBR min) and low leakage (<1 µA at 7.5 V). Its clamping behavior is defined by a 10/1000 µs double-exponential surge waveform, delivering 14.3 V maximum clamping voltage at 100 A IPPM under standard test conditions.
It meets AEC-Q101 stress requirements for automotive electronics and complies with ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity standards. The device is rated for continuous operation from –55 °C to +150 °C junction temperature and packaged in moisture-sensitive level 1 DO-214AC (SMA) housing with matte tin-plated leads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse operating voltage before conduction begins; sets system rail margin for 9–12 V nominal supplies. |
| VBR @ IT=1 mA | 8.33–10.30 V - Breakdown threshold range; ensures reliable triggering above normal transients but below IC absolute max ratings. |
| VC @ IPPM=100 A | 14.3 V - Clamped voltage during worst-case surge; protects downstream 16 V-rated components like MOSFETs or regulators. |
| IPPM | 100 A - Peak impulse current handling capacity under 10/1000 µs waveform; supports high-energy load dump events. |
| PPPM | 400 W - Peak pulse power dissipation capability; enables compact placement without external heat sinking in short-duration surges. |
| IR @ VWM | <1 µA - Reverse leakage at stand-off voltage; minimizes standby power loss in battery-critical systems. |
| TJ Range | –55 to +150 °C - Full automotive-grade junction temperature range; validated for under-hood and engine control module environments. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode band marking. Case meets UL 94V-0 flammability rating; terminals are matte tin-plated and solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected line (e.g., 12 V rail); conducts during reverse-biased overvoltage events. |
| Cathode | Ground/Reference side | Connected to system ground or low-impedance return path; defines unidirectional clamping polarity. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTGB, HTRB, and temperature cycling. |
| ISO 7637-2 compliant | Withstands standardized vehicle electrical transients (Pulse 1/2a/2b/3a/3b) without degradation or failure. |
| Glass passivated junction | Enhances long-term reliability and stability of VBR and leakage under thermal/humidity stress. |
| Fast response time | <1.0 ps rise-to-breakdown; limits voltage overshoot during nanosecond-scale ESD or switching spikes. |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement prior to reflow; compatible with standard SMT assembly lines. |
Applications
| Automotive Lighting Driver | On-Board DC/DC Converter |
|---|---|
Use Scenario: Protecting LED driver ICs and MOSFETs from load dump and jump-start transients in headlamp modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input rail to clamp surges before they reach buck controller and gate drivers. Use Value: Limits peak rail voltage to ≤14.3 V during 100 A pulses, preventing latch-up or gate oxide damage in 16 V-rated controllers. | Use Scenario: Safeguarding 5 V or 3.3 V point-of-load regulators fed from 12 V vehicle battery in ADAS domain controllers. IC Role / Device Role / Timing Role: Primary overvoltage clamp on primary-side input, coordinated with upstream fuse and downstream ceramic filtering. Use Value: Enables use of smaller input capacitors by absorbing energy that would otherwise cause regulator shutdown or reset. |
| Industrial SMPS Input Stage | USB-C Power Delivery Adapter |
Use Scenario: Input-stage surge suppression in 24 V industrial switch-mode power supplies exposed to inductive switching noise. IC Role / Device Role / Timing Role: Standoff-clamp TVS parallel to bulk capacitor, triggered only during >7.5 V transients exceeding normal ripple. Use Value: Maintains 7.5 V VWM margin while delivering 400 W pulse handling - eliminating need for series impedance or multi-stage protection. | Use Scenario: Secondary-side transient protection on 5–20 V USB PD output rails against hot-plug and cable-induced surges. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to common ground, placed immediately after DC-DC post-regulator stage. Use Value: Provides sub-15 V clamping at 100 A with <1 µA leakage - preserving efficiency and meeting USB IF ESD immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5A | Lower VBR range (8.33–9.21 V) and tighter tolerance; same VC = 12.9 V at 100 A. | Better suited for designs requiring lower trigger threshold and tighter VBR consistency across temperature. | Select SMAJ7.5A when tighter breakdown distribution and reduced clamping variance are critical for low-voltage rail protection. |
| SMBJ7.5H | Same VWM/VBR/VC specs but in larger DO-214AA (SMB) package; higher PPPM = 600 W. | Preferred where higher surge margin or legacy PCB layout compatibility with SMB footprint is required. | Choose SMBJ7.5H if board space allows and higher 600 W pulse rating is needed for extended surge duration or repeated events. |
Compared with SMAJ7.5H, SMAJ7.5A offers tighter VBR control for precision-triggered protection, while SMBJ7.5H provides greater surge energy absorption in a physically larger package - enabling trade-offs between layout density, clamping predictability, and pulse endurance.
Availability
SMAJ7.5H is available at Aetrix Electronics and suitable for automotive lighting systems, on-board DC/DC converters, and industrial SMPS designs requiring stable component supply, AEC-Q101 qualification, and ISO 7637-2 compliance.
Supply support for SMAJ7.5H 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 is part of TSC's AEC-Q101-qualified transient suppression portfolio, engineered specifically for automotive and industrial power rail protection where fast response, low leakage, and high surge resilience are mandatory.
FAQ
What is the clamping voltage of SMAJ7.5H at its rated peak pulse current?
The SMAJ7.5H has a maximum clamping voltage (VC) of 14.3 V when subjected to a 100 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per JEDEC test conditions and guarantees that downstream components see no more than 14.3 V during surge events - critical for protecting 16 V-rated ICs and MOSFETs in automotive and industrial applications. The SMAJ7.5H maintains this clamping performance across its full operating temperature range.
Is SMAJ7.5H suitable for bidirectional transient protection?
No, SMAJ7.5H is a unidirectional TVS diode intended for DC rail protection with defined anode–cathode polarity. For bidirectional applications such as AC lines or data bus protection, TSC offers the SMAJ7.5H's bipolar counterpart SMAJ7.5CH (with CH suffix), which provides symmetrical clamping in both directions. Using SMAJ7.5H in a bidirectional configuration risks forward conduction and failure during negative transients - always verify polarity alignment in schematic and layout for SMAJ7.5H.
Does SMAJ7.5H meet automotive qualification standards?
Yes, SMAJ7.5H is AEC-Q101 qualified and certified for automotive electronics, having passed stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling. It also meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for vehicle electrical system transients. These qualifications make SMAJ7.5H appropriate for use in engine control units, body control modules, and lighting systems where reliability under harsh environmental conditions is essential.
What is the maximum steady-state power dissipation rating for SMAJ7.5H?
The SMAJ7.5H has a steady-state power dissipation (PD) rating of 1 W at 25 °C ambient temperature, derated linearly above that point per the pulse derating curve in the datasheet. This rating applies only to continuous DC or low-frequency reverse leakage power - not to transient surge events. During normal operation at 7.5 V VWM, reverse leakage remains below 1 µA, resulting in negligible steady-state power (<7.5 µW), making thermal management straightforward in typical PCB layouts.
How does the DO-214AC (SMA) package of SMAJ7.5H compare to SMB or SMC variants?
The DO-214AC (SMA) package of SMAJ7.5H measures 4.5 × 2.7 × 2.1 mm and offers a balance of compact size and 400 W surge capability. Compared to the larger DO-214AA (SMB) used in SMBJ7.5H (600 W) or DO-214AB (SMC) in SMCJ7.5H (1500 W), SMA provides higher power density but lower absolute energy handling. Its lead-free matte tin plating and J-STD-020 Level 1 moisture rating ensure compatibility with standard reflow profiles - unlike SMC, which may require special handling due to higher thermal mass.
SMAJ7.5H 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):
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ7.5H FAQ
1.How can I place an order for SMAJ7.5H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5H 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 SMAJ7.5H reliable?
The price and inventory of SMAJ7.5H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.5H is usually 5 days.
3.What payment methods are accepted for SMAJ7.5H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5H?
SMAJ7.5H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5H 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 SMAJ7.5H?
For technical support, including SMAJ7.5H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5H requirements.
6.How does Aetrix verify that SMAJ7.5H is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5H 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 SMAJ7.5H meets industry standards.
7.What is the process for return or replacement of SMAJ7.5H?
All SMAJ7.5H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5H, 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 SMAJ7.5H part is unused and in its original packaging.
Return procedure for SMAJ7.5H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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