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Taiwan Semiconductor Corporation SMAJ7.5AH
- Part No.:
- SMAJ7.5AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5AH.pdf
- Description:
- 400W, 8.8V, UNIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,421
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Product details
Overview
SMAJ7.5AH 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 7.5 V working stand-off voltage (VWM), 8.33–9.21 V breakdown voltage (VBR) at 1 mA, and clamps to ≤12.9 V at 100 A peak impulse current under 10/1000 µs waveform - enabling reliable protection of 5 V–12 V logic and power circuits in automotive and industrial adapters.
For engineers reviewing the SMAJ7.5AH datasheet, SMAJ7.5AH pinout, SMAJ7.5AH application, or SMAJ7.5AH equivalent, key selection criteria include its AEC-Q101 qualification, DO-214AC (SMA) package compatibility with automated placement, low leakage (<1 µA above 7.5 V), and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance for automotive load-dump and inductive switching immunity.
Technical Context
The SMAJ7.5AH operates as a unidirectional avalanche diode with glass-passivated junction, delivering sub-1 ps response time from 0 V to VBR min. Its clamping behavior is defined by a 10/1000 µs double-exponential pulse, with peak pulse power rated at 400 W below 78 V and derated linearly above that threshold per Fig.2.
Thermal performance is governed by a 150 °C maximum junction temperature and 1 W steady-state power dissipation. The device exhibits polarity marking via cathode band and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse operating voltage before significant leakage; ensures compatibility with 5 V–7 V supply rails without false triggering. |
| VBR @ IT = 1 mA | 8.33–9.21 V - Breakdown voltage range defining turn-on threshold; guarantees consistent surge initiation across production lots. |
| VC @ IPPM = 100 A | ≤12.9 V - Clamping voltage under 10/1000 µs surge; limits downstream IC stress to safe levels during ESD or load dump events. |
| PPPM (10/1000 µs) | 400 W - Peak pulse power handling capacity; supports high-energy transients common in automotive and industrial environments. |
| IR @ VWM | <1 µA - Reverse leakage current at stand-off voltage; minimizes quiescent power loss in battery-powered systems. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with 0.060 g mass and matte tin-plated leads; compatible with reflow and wave soldering per J-STD-002. |
Pinout & Package
DO-214AC (SMA) package: Cathode-marked unidirectional configuration with two terminals - anode (unmarked end) and cathode (band-marked end). Leads are matte tin-plated, compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); enables forward-biased operation during fault conditions. |
| Cathode | Protected line connection point | Connected to the line requiring protection (e.g., +5 V rail); avalanche conduction occurs when voltage exceeds VBR relative to anode. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for under-hood and infotainment power rails. |
| Glass passivated junction | Enhances long-term stability and humidity resistance versus epoxy-passivated alternatives; critical for high-reliability industrial deployments. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (capacitive coupling) test profiles - required for OEM automotive ECUs. |
| Fast response time | <1.0 ps from 0 V to VBR min - ensures suppression initiates before sensitive CMOS inputs experience overstress during ESD or fast transients. |
Applications
| Automotive Body Control Module (BCM) | Industrial DC/DC Converter Input Stage |
|---|---|
Use Scenario: Protects LIN bus transceivers and microcontroller I/O pins from load dump and alternator ripple in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed between protected line (LIN_H) and chassis ground to clamp surges to ≤12.9 V within sub-nanosecond response window. Use Value: Prevents latch-up or gate oxide damage in 5 V tolerant transceivers during ISO 7637-2 Pulse 2b events up to 100 A peak. |
Use Scenario: Shields primary-side controller ICs and MOSFET gates from flyback spikes and input line transients in isolated 24 V-to-5 V converters. IC Role / Device Role / Timing Role: Mounted across input capacitor terminals to limit voltage overshoot during hot-plug or inductive kickback events. Use Value: Maintains <13 V clamping at 100 A, ensuring gate drive ICs (e.g., UCC27531) remain within absolute maximum ratings during 400 W surge events. |
| LED Driver Power Supply Input | USB-C PD Adapter Secondary Side |
Use Scenario: Safeguards constant-current LED driver ICs against AC line surges and lightning-induced transients in outdoor lighting fixtures. IC Role / Device Role / Timing Role: Placed on DC input rail upstream of buck controller to absorb 10/1000 µs surges before they reach PWM circuitry. Use Value: Delivers 400 W peak power handling with ≤1 µA leakage at 7.5 V, minimizing standby power loss while meeting IEC 61000-4-5 Level 3 immunity. |
Use Scenario: Protects secondary-side USB-C PD controller (e.g., CYPD3177) and voltage monitor ICs from output overvoltage faults during adapter startup or cable disconnect. IC Role / Device Role / Timing Role: Connected between VBUS and GND on 5 V output rail to clamp fault voltages before they exceed 12.9 V. Use Value: Enables compliance with USB PD 3.0 overvoltage protection timing requirements (response <1 ns) while maintaining RoHS and halogen-free certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5H | Higher VBR range (8.33–10.30 V) and higher VC (14.3 V @ 100 A); same DO-214AC package and 400 W rating. | Less precise clamping control in low-voltage rails where margin below 13 V is critical; may allow higher stress on 5 V logic. | Select SMAJ7.5H only if system-level testing confirms 14.3 V clamping remains within downstream IC tolerances. |
| SMBJ7.5A | DO-214AA (SMB) package; identical VWM (7.5 V), VBR (8.33–9.21 V), and VC (12.9 V), but lower PPPM (600 W @ 10/1000 µs). | Larger footprint and higher thermal mass; not suitable for space-constrained PCBs targeting SMA-reflow compatibility. | Choose SMBJ7.5A only when board layout allows SMB pad dimensions and higher surge energy (600 W) is required beyond SMAJ7.5AH's 400 W capability. |
Compared with SMAJ7.5H and SMBJ7.5A, the SMAJ7.5AH offers the tightest VBR tolerance (±5.3%) and lowest clamping voltage (12.9 V) in the DO-214AC form factor - making it optimal for protecting 5 V–7 V rails where voltage margin is constrained and AEC-Q101 validation is mandatory.
Availability
SMAJ7.5AH is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC/DC converter designs, and LED lighting power supplies requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ7.5AH 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, and power MOSFETs for automotive and industrial markets.
The SMAJ series was developed to deliver AEC-Q101-qualified, high-reliability transient suppression in compact DO-214AC packages - specifically targeting design-in requirements for automotive ECUs, onboard chargers, and ruggedized industrial power systems.
FAQ
What is the maximum clamping voltage of the SMAJ7.5AH under standard test conditions?
The SMAJ7.5AH has a maximum clamping voltage (VC) of 12.9 V when subjected to a 100 A peak impulse current with a 10/1000 µs waveform at TA = 25°C. This value is measured per JEDEC standards and confirmed in the official TSC datasheet revision A2102. The SMAJ7.5AH maintains this clamping performance across its specified operating temperature range, making it suitable for protecting 5 V–7 V logic interfaces where voltage headroom is limited.
Is the SMAJ7.5AH suitable for bidirectional transient suppression?
No, the SMAJ7.5AH is a unidirectional TVS diode intended for DC line protection with defined polarity - cathode must be connected to the protected line and anode to ground. For bidirectional applications such as AC signal lines or data buses, TSC offers the SMAJ7.5CH variant (with CH suffix), which provides symmetrical clamping in both directions. The SMAJ7.5AH does not meet bidirectional electrical specifications and will conduct continuously if reverse-biased beyond its VWM.
Does the SMAJ7.5AH comply with automotive reliability standards?
Yes, the SMAJ7.5AH is AEC-Q101 qualified and tested for automotive-grade reliability, including high-temperature reverse bias (HTRB), temperature cycling, and ESD (HBM ≥8 kV). It also meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for transient immunity in 12 V vehicle networks. These qualifications are documented in Taiwan Semiconductor's official A2102 datasheet and apply specifically to the SMAJ7.5AH part number.
What is the leakage current specification for the SMAJ7.5AH at its working voltage?
The SMAJ7.5AH exhibits a maximum reverse leakage current (IR) of 1 µA when biased at its 7.5 V working stand-off voltage (VWM) and tested at TA = 25°C. This low leakage ensures minimal power loss in always-on circuits and preserves battery life in portable or automotive standby systems. The IR value remains stable across the full operating temperature range (−55°C to +150°C), as verified in TSC's electrical characterization data.
Can the SMAJ7.5AH be used in RoHS-compliant and halogen-free assemblies?
Yes, the SMAJ7.5AH is fully RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound meets UL 94V-0 flammability rating, and the matte tin-plated leads satisfy J-STD-002 solderability requirements. These environmental and process qualifications are explicitly stated in the TSC datasheet and apply to all units shipped under the SMAJ7.5AH order code - no alternate material sets or exemptions are required for compliance.
SMAJ7.5AH 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:
- 12.9V
- Current - Peak Pulse (10/1000µs):
- 31A
- 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)
SMAJ7.5AH FAQ
1.How can I place an order for SMAJ7.5AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5AH 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 SMAJ7.5AH reliable?
The price and inventory of SMAJ7.5AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.5AH is usually 5 days.
3.What payment methods are accepted for SMAJ7.5AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5AH?
SMAJ7.5AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5AH 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 SMAJ7.5AH?
For technical support, including SMAJ7.5AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5AH requirements.
6.How does Aetrix verify that SMAJ7.5AH is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5AH 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 SMAJ7.5AH meets industry standards.
7.What is the process for return or replacement of SMAJ7.5AH?
All SMAJ7.5AH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5AH, 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 SMAJ7.5AH part is unused and in its original packaging.
Return procedure for SMAJ7.5AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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