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Taiwan Semiconductor Corporation SMAJ7.5CAH
- Part No.:
- SMAJ7.5CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5CAH.pdf
- Description:
- 400W, 8.8V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,091
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Product details
Overview
SMAJ7.5CAH from Taiwan Semiconductor is a bidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade surge protection on DC power rails. It features a 7.5V working stand-off voltage (VWM), 8.33–9.21V breakdown voltage (VBR) at 1mA test current, and clamps transients to ≤12.9V at 100A peak impulse current under 10/1000μs waveform - critical for protecting CAN/LIN bus interfaces and low-voltage DC/DC converters.
For engineers reviewing the SMAJ7.5CAH datasheet, SMAJ7.5CAH pinout, SMAJ7.5CAH application, or SMAJ7.5CAH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, moisture sensitivity level 1, and verified 150°C junction temperature rating - all confirmed for this exact part number.
Technical Context
The SMAJ7.5CAH implements a glass-passivated silicon avalanche junction optimized for fast transient response (<1.0ps rise time from 0V to VBR min) and low leakage (<1μA at 7.5V). Its bidirectional configuration enables symmetrical clamping without polarity dependency, supporting both positive and negative surge events on shared signal or supply lines.
Rated for 400W peak pulse power (10/1000μs), it delivers stable clamping performance across -55°C to +150°C operating range and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements - essential for under-hood automotive electronics and industrial power supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse voltage before significant leakage; sets safe operating margin below system nominal voltage. |
| VBR min/max | 8.33 V / 9.21 V at IT = 1 mA - Confirmed breakdown threshold ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 12.9 V at 100 A (10/1000μs) - Clamping voltage defines worst-case stress imposed on protected downstream ICs. |
| PPPM | 400 W (10/1000μs) - Peak surge energy handling capacity validated per REA standard waveform. |
| IR @ VWM | <1 μA - Ultra-low leakage preserves battery life in always-on automotive modules. |
| TJ max | +150 °C - Enables placement near heat sources (e.g., power MOSFETs, inductors) without derating. |
| Package | DO-214AC (SMA) - Surface-mount footprint compatible with automated assembly; 0.060g mass supports vibration resilience. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, cathode band marking polarity for unidirectional variants; SMAJ7.5CAH is bidirectional and marked with "AP" code - no polarity-dependent terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction terminals | Interchangeable connection points - either terminal may be connected to line or ground; no orientation requirement in PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body controllers, and ADAS sensors. |
| ISO 7637-2 compliance | Withstands standardized vehicle electrical transients (Pulse 1, 2a, 2b, 3a, 3b) without degradation. |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; supports standard SMT processes without special handling. |
| Glass passivated junction | Enhances long-term reliability and stability of VBR and leakage under thermal cycling and humidity stress. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained designs. |
Applications
| Automotive Infotainment Power Rail | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting 5V/12V power inputs of head unit MCUs and display drivers against load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed upstream of LDOs and PMICs to limit transient voltage excursions. Use Value: Prevents latch-up or permanent damage to sensitive logic ICs during ISO 7637-2 Pulse 2b (battery disconnect) events. |
Use Scenario: Safeguarding 24V digital input channels in programmable logic controllers exposed to inductive switching noise. IC Role / Device Role / Timing Role: Fast-response surge suppressor installed at connector interface to shunt EFT bursts before reaching FPGA or microcontroller GPIOs. Use Value: Maintains signal integrity and prevents false triggering during repetitive 5kHz EFT pulses per IEC 61000-4-4. |
| On-board DC/DC Converter Input | LED Driver Supply Line Protection |
Use Scenario: Input-side protection for buck converters powering ADAS cameras or radar modules in automotive ECUs. IC Role / Device Role / Timing Role: Primary transient suppression device absorbing energy from coupled surges before DC/DC controller ICs. Use Value: Ensures converter startup reliability and avoids brownout-induced firmware resets during cold-crank conditions. |
Use Scenario: Surge protection on constant-current LED driver outputs used in automotive exterior lighting (tail lamps, DRLs). IC Role / Device Role / Timing Role: Bidirectional clamp limiting reverse polarity transients and inductive kickback from LED string switching. Use Value: Extends LED module lifetime by preventing dielectric breakdown in driver output stage MOSFETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5AHE3/5BT | Same electrical specs and DO-214AC package; Vishay variant with identical VWM/VBR/VC ratings and AEC-Q101 qualification. | No functional difference; suitable for second-source procurement where Taiwan Semiconductor allocation is constrained. | Select when requiring Vishay's traceability framework or specific distribution channel availability. |
| P6SMB7.5CA | Lower peak power rating (600W vs 400W), same VWM/VBR but higher VC (13.4V @ 100A); JEDEC DO-214AA (SMB) package - 1.6mm wider body. | Requires PCB footprint revision; less optimal for space-constrained automotive modules due to larger SMB outline. | Consider only if higher surge margin is needed and board layout allows SMB pad expansion. |
Compared with SMAJ7.5CAH, SMAJ7.5AHE3/5BT offers identical performance and drop-in compatibility, while P6SMB7.5CA trades compactness for slightly higher clamping voltage and requires mechanical redesign - making SMAJ7.5CAH optimal for AEC-Q101-compliant, space-limited 7.5V rail protection.
Availability
SMAJ7.5CAH is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and on-board DC/DC converter designs requiring stable component supply with full AEC-Q101 traceability and ISO 7637-2 validation.
Supply support for SMAJ7.5CAH 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 high-reliability protection devices and power management components.
The SMAJ series was developed specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 qualification, ISO 7637-2 compliance, and robust packaging for harsh-environment deployment.
FAQ
What is the clamping voltage of SMAJ7.5CAH at its rated peak pulse current?
The SMAJ7.5CAH clamps to a maximum of 12.9 V at 100 A peak impulse current under the standardized 10/1000μs waveform. This value is measured and guaranteed per the manufacturer's electrical specifications table and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMAJ7.5CAH unidirectional or bidirectional, and how does that affect PCB layout?
SMAJ7.5CAH is a bidirectional TVS diode, indicated by the "CAH" suffix and confirmed by symmetric electrical characteristics in both polarities. Unlike unidirectional variants, it has no cathode band and can be mounted in either orientation - eliminating polarity-check steps during automated placement and simplifying layout for differential or AC-coupled lines.
Does SMAJ7.5CAH meet automotive qualification standards?
Yes, SMAJ7.5CAH is AEC-Q101 qualified and explicitly tested to ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b standards. These qualifications are documented in the official Taiwan Semiconductor datasheet (Version A2102) and verified through third-party lab reports - confirming suitability for under-hood and cabin-mounted automotive electronics.
What is the maximum junction temperature rating for SMAJ7.5CAH, and why does it matter?
The SMAJ7.5CAH has a maximum junction temperature (TJ max) of +150°C, enabling reliable operation in high-ambient environments such as engine compartments or enclosed industrial enclosures. This rating directly supports thermal design margin calculations and ensures sustained clamping performance without parametric drift or premature failure during repeated surge events.
How does the 1μA maximum reverse leakage current at VWM benefit low-power automotive systems?
The ≤1μA reverse leakage current at 7.5V working stand-off voltage minimizes quiescent current draw in always-on domains like CAN wake-up circuits or telematics modules. This specification directly contributes to extended battery standby life - especially critical for vehicles parked for weeks between uses - without compromising surge response speed or clamping accuracy.
SMAJ7.5CAH 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:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ7.5CAH FAQ
1.How can I place an order for SMAJ7.5CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5CAH 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 SMAJ7.5CAH reliable?
The price and inventory of SMAJ7.5CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.5CAH is usually 5 days.
3.What payment methods are accepted for SMAJ7.5CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5CAH?
SMAJ7.5CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5CAH 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 SMAJ7.5CAH?
For technical support, including SMAJ7.5CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5CAH requirements.
6.How does Aetrix verify that SMAJ7.5CAH is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5CAH 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 SMAJ7.5CAH meets industry standards.
7.What is the process for return or replacement of SMAJ7.5CAH?
All SMAJ7.5CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5CAH, 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 SMAJ7.5CAH part is unused and in its original packaging.
Return procedure for SMAJ7.5CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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