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Vishay General Semiconductor - Diodes Division SMAJ7.5CAHE3/5A
- Part No.:
- SMAJ7.5CAHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5CAHE3/5A.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,782
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Product details
Overview
SMAJ7.5CAHE3/5A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features a 7.5 V stand-off voltage (VWM), 8.33–9.21 V breakdown voltage (VBR) at 1.0 mA test current, and clamps to ≤12.9 V at 31.0 A peak pulse current (IPPM) under 10/1000 μs waveform - ideal for protecting MOSFET gates and sensor I/O in automotive ECUs.
For engineers reviewing the SMAJ7.5CAHE3/5A datasheet, SMAJ7.5CAHE3/5A pinout, SMAJ7.5CAHE3/5A application, or SMAJ7.5CAHE3/5A equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 400 W peak pulse power rating, low clamping ratio (VC/VBR ≈ 1.55), and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This device operates as a voltage-clamping protector with symmetrical reverse/forward conduction behavior due to its bidirectional construction. Its glass-passivated junction enables fast response (<1 ps) to ESD and lightning-induced surges while maintaining low incremental surge resistance and stable thermal performance up to 150 °C junction temperature.
The SMAJ7.5CAHE3/5A complies with ANSI/IEEE C62.35 surge standards and delivers 400 W peak pulse power (10/1000 μs) when mounted on 0.2" × 0.2" copper pads. It meets MSL Level 1 per J-STD-020 and supports reflow soldering up to 260 °C peak temperature - critical for high-reliability automotive and industrial production environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - maximum continuous reverse operating voltage before clamping begins; defines safe signal line operating margin |
| VBR min/max | 8.33 V / 9.21 V at 1.0 mA - verified breakdown threshold ensures predictable turn-on during overvoltage events |
| VC @ IPPM | ≤12.9 V at 31.0 A - clamping voltage limits stress on downstream ICs such as microcontrollers or CAN transceivers |
| PPPM | 400 W (10/1000 μs) - surge energy handling capacity sufficient for ISO 7637-2 Pulse 1 & 2 and IEC 61000-4-5 Level 3 |
| IPPM | 31.0 A - peak surge current capability enables protection of 12 V automotive supply rails and sensor interfaces |
| TJ max | +150 °C - extended junction temperature rating supports under-hood and industrial ambient conditions |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity-unmarked for bidirectional operation; compliant with UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (either direction) | Accepts surge current regardless of polarity - enables symmetric clamping on AC-coupled or floating lines |
| Cathode | Transient current exit point (either direction) | Completes low-impedance path to ground or return rail during both positive and negative transients |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements - supports use in engine control, ADAS, and body modules |
| 400 W peak pulse power | Handles repetitive 10/1000 μs surges without degradation when derated above 25 °C ambient |
| Low clamping ratio (VC/VBR ≈ 1.55) | Minimizes voltage overshoot across protected nodes - preserves timing margins for high-speed digital interfaces |
| MSL Level 1 moisture sensitivity | Enables direct placement into reflow ovens without baking - reduces manufacturing overhead and risk of popcorning |
| Glass passivated junction | Ensures stable leakage current (<100 μA at VWM) and long-term reliability under thermal cycling |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs against load dump and alternator ripple in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between VCC and GND, responding within picoseconds to transients exceeding 7.5 V. Use Value: Limits transient voltage to ≤12.9 V, preventing latch-up or gate oxide damage in 3.3 V/5 V logic devices powered from the same rail. |
Use Scenario: Shielding analog output pins of pressure or temperature sensors connected to PLC analog input modules. IC Role / Device Role / Timing Role: Low-capacitance TVS shunting induced surges on 4–20 mA or 0–10 V signal lines before reaching ADC front-end. Use Value: Maintains signal integrity by clamping transients without distorting DC accuracy or introducing measurable capacitance (>100 pF) at operating frequencies. |
| Consumer USB Port ESD Protection | Telecom Line Card Surge Suppression |
Use Scenario: Adding secondary-level ESD robustness to USB 2.0 data lines (D+/D−) in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Bidirectional suppressor placed in series with each data line, referenced to common-mode ground. Use Value: Absorbs ±15 kV contact discharge (IEC 61000-4-2) without forward conduction that would disrupt differential signaling. |
Use Scenario: Front-end protection of Ethernet PHY interfaces or DSL line drivers exposed to lightning-induced surges on outdoor telecom lines. IC Role / Device Role / Timing Role: Primary surge limiter located before isolation transformers or choke filters in line card BOMs. Use Value: Withstands 400 W 10/1000 μs surges per IEC 61000-4-5, enabling compliance with GR-1089-CORE Level 3 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 |
|---|---|---|---|
| SMAJ7.5CA-E3/5A | RoHS-compliant commercial-grade version without AEC-Q101 qualification; identical electrical specs and package | Lacks automotive qualification - suitable for consumer or industrial non-automotive designs | Select when AEC-Q101 is not required and cost optimization is prioritized |
| SMBJ7.5CAHE3/5A | Same VWM/VC ratings but in larger SMB (DO-214AA) package with higher 600 W PPPM rating and 43.0 A IPPM | Better surge handling for high-energy environments; requires larger PCB footprint and different pad layout | Choose when system-level surge testing exceeds 400 W or board space permits larger package |
Compared with SMAJ7.5CA-E3/5A, the SMAJ7.5CAHE3/5A adds AEC-Q101 qualification for automotive use without altering electrical performance; compared with SMBJ7.5CAHE3/5A, it trades 200 W pulse power headroom for 30% smaller PCB area and tighter layout constraints.
Availability
SMAJ7.5CAHE3/5A is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom line card prototyping requiring stable component supply across multi-year production cycles.
Supply support for SMAJ7.5CAHE3/5A 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability and application-specific performance.
The SMAJ series was engineered for high-volume, high-reliability transient suppression in automotive, industrial, and communications systems - balancing compact size, AEC-Q101 compliance, and repeatable clamping behavior.
FAQ
What is the clamping voltage of the SMAJ7.5CAHE3/5A at its rated peak pulse current?
The SMAJ7.5CAHE3/5A exhibits a maximum clamping voltage (VC) of 12.9 V when subjected to its rated peak pulse current (IPPM) of 31.0 A under the standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024. The SMAJ7.5CAHE3/5A maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C.
Is the SMAJ7.5CAHE3/5A suitable for automotive applications?
Yes, the SMAJ7.5CAHE3/5A is AEC-Q101 qualified, making it suitable for automotive applications including engine control units, body electronics, and ADAS subsystems. Its qualification covers stress tests for temperature cycling, humidity bias, mechanical shock, and high-temperature operating life. The SMAJ7.5CAHE3/5A also meets MSL Level 1 and supports lead-free reflow up to 260 °C - essential for modern automotive PCB assembly.
How does the bidirectional configuration of the SMAJ7.5CAHE3/5A affect its circuit implementation?
The bidirectional configuration of the SMAJ7.5CAHE3/5A eliminates polarity marking and allows installation without orientation concerns - critical for differential signal lines or AC-coupled paths. It provides symmetrical clamping in both directions, ensuring consistent protection against positive and negative transients on the same node. Unlike unidirectional variants, the SMAJ7.5CAHE3/5A has no cathode band and must be placed between two nodes without reference to ground polarity.
What is the thermal resistance of the SMAJ7.5CAHE3/5A, and how does it impact power dissipation?
The SMAJ7.5CAHE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W when mounted on minimum recommended copper pads. At 25 °C ambient, its steady-state power dissipation (PD) is rated at 3.3 W; however, derating is required above 25 °C using the curve in Figure 2 of the datasheet. These values directly constrain continuous leakage current handling and influence layout decisions for thermal relief pads.
Does the SMAJ7.5CAHE3/5A meet any international surge immunity standards?
Yes, the SMAJ7.5CAHE3/5A is characterized per ANSI/IEEE C62.35 and supports compliance with IEC 61000-4-5 (surge immunity), IEC 61000-4-2 (ESD), and ISO 7637-2 (automotive transients). Its 400 W peak pulse power rating at 10/1000 μs aligns with Level 3 requirements of IEC 61000-4-5, and its fast response time (<1 ps) enables effective suppression of sub-nanosecond ESD events. The SMAJ7.5CAHE3/5A itself is not certified to these standards, but its parameters enable system-level compliance when properly applied.
SMAJ7.5CAHE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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)
SMAJ7.5CAHE3/5A FAQ
1.How can I place an order for SMAJ7.5CAHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5CAHE3/5A 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 SMAJ7.5CAHE3/5A reliable?
The price and inventory of SMAJ7.5CAHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.5CAHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ7.5CAHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5CAHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5CAHE3/5A?
SMAJ7.5CAHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5CAHE3/5A 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 SMAJ7.5CAHE3/5A?
For technical support, including SMAJ7.5CAHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5CAHE3/5A requirements.
6.How does Aetrix verify that SMAJ7.5CAHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5CAHE3/5A 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 SMAJ7.5CAHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ7.5CAHE3/5A?
All SMAJ7.5CAHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5CAHE3/5A, 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 SMAJ7.5CAHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ7.5CAHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ7.5CAHE3/5A Tags
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