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Vishay General Semiconductor - Diodes Division SMAJ7.5CAHM3_A/H
- Part No.:
- SMAJ7.5CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5CAHM3_A/H.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,044
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Product details
Overview
SMAJ7.5CAHM3_A/H 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 and power lines. It features 7.5 V stand-off voltage (VWM), 8.33–9.21 V breakdown voltage (VBR) at 1 mA test current, 12.9 V maximum clamping voltage (VC) at 31.0 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ7.5CAHM3_A/H datasheet, SMAJ7.5CAHM3_A/H pinout, SMAJ7.5CAHM3_A/H application, or SMAJ7.5CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), low leakage (<100 μA at VWM), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ) up to 7.5 V reverse stand-off voltage, then rapidly transitions to low-impedance conduction when transient voltage exceeds its breakdown threshold. Its bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity constraints.
Clamping performance is defined by a 12.9 V VC at 31.0 A IPPM (10/1000 μs), with <0.07 %/°C temperature coefficient of VBR ensuring stable trip point across -55 °C to +150 °C operating junction range. The glass-passivated junction and matte tin-plated leads meet J-STD-002 solderability and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse working voltage before significant leakage; defines safe operating margin for protected line. |
| VBR min/max | 8.33 V / 9.21 V at 1.0 mA - Confirmed breakdown range ensures reliable turn-on during overvoltage events. |
| VC @ IPPM | 12.9 V at 31.0 A - Clamping voltage limits stress on downstream components during 10/1000 μs surge. |
| PPPM | 400 W - Peak pulse power handling capacity per single transient event under standard waveform. |
| ID @ VWM | <100 μA - Low reverse leakage preserves signal integrity and minimizes standby power loss. |
| TJ max. | +150 °C - Enables operation in under-hood automotive and high-temperature industrial environments. |
| RθJA | 120 °C/W - Thermal resistance determines required copper pad area (0.2" × 0.2") for sustained power dissipation. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C peak reflow). Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); cathode band absent (bidirectional type).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive half-cycle) | Conducts surge current into device during positive overvoltage; symmetric with Cathode for bidirectional operation. |
| Cathode | Transient current entry (negative half-cycle) | Conducts surge current into device during negative overvoltage; electrically identical to Anode in CA-type construction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces. |
| 400 W peak pulse power | Handles IEC 61000-4-5 surge events (10/1000 μs) without degradation when mounted on 5.0 mm × 5.0 mm copper pads. |
| Low clamping ratio (VC/VBR ≈ 1.44) | Minimizes voltage overshoot during clamping, reducing risk of latch-up or damage to protected ICs. |
| MSL Level 1 moisture sensitivity | Enables direct placement without baking; compatible with standard SMT reflow profiles up to 260 °C peak. |
| Glass-passivated junction | Improves long-term reliability and stability of VBR under thermal cycling and humidity exposure. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching transients in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed across differential signal pair or supply rail to divert surge energy to ground. Use Value: Maintains signal integrity during ISO 7637-2 Pulse 5a (load dump) events while meeting AEC-Q101 qualification for production deployment. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers against ESD and field-wiring induced surges in factory automation environments. IC Role / Device Role / Timing Role: Parallel-connected TVS on each 24 V DC input channel to limit transient voltage before optocoupler or microcontroller input stage. Use Value: Prevents false triggering and component failure during 4 kV contact ESD (IEC 61000-4-2) and 2 kV surge (IEC 61000-4-5) events. |
| Consumer Power Adapter Output | Telecom Line Interface Protection |
|
Use Scenario: Clamping output overvoltage spikes from flyback converter secondary windings in USB-C PD adapters and AC/DC wall adapters. IC Role / Device Role / Timing Role: Secondary-side TVS across +VOUT and GND to suppress ringing and transformer leakage-induced transients. Use Value: Limits output voltage excursion to ≤12.9 V during 10/1000 μs surges, protecting connected devices compliant with USB PD v3.0 voltage tolerance. |
Use Scenario: Protecting Ethernet PHY interface pins and RS-485 transceiver inputs from lightning-induced surges in outdoor telecom equipment cabinets. IC Role / Device Role / Timing Role: Bidirectional TVS placed between differential data lines (e.g., A/B) and ground to clamp common-mode transients. Use Value: Achieves >1 kV surge immunity per IEC 61000-4-5 Level 3 while maintaining <1 pF junction capacitance to avoid signal distortion at 100 Mbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5CAHE3_A/H | Same electrical specs; RoHS-compliant but not halogen-free; uses standard matte tin plating (JESD201 Class 2). | Qualified for commercial/industrial use only; lacks halogen-free certification required for some automotive Tier-1 programs. | Select when halogen-free material compliance is not mandated and cost optimization is prioritized. |
| SMAJ7.5CAHM3_A/I | Identical electrical and mechanical specs; differs only in packaging format (7500-piece 13" reel vs. 1800-piece 7" reel). | No functional difference; suited for high-volume SMT line feed requiring larger reels and reduced changeover frequency. | Select for automated assembly lines with bulk feeder compatibility and extended production runs. |
Compared with SMAJ7.5CAHM3_A/H, the HE3 variant trades halogen-free compliance for lower unit cost in non-automotive settings, while the HM3_A/I offers identical protection in higher-reel-volume packaging - enabling optimized procurement strategy without compromising circuit-level surge performance.
Availability
SMAJ7.5CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, consumer power adapter outputs, and telecom line interfaces requiring stable component supply with full traceability and lifecycle continuity.
Supply support for SMAJ7.5CAHM3_A/H 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, automotive qualification, and high-volume manufacturability.
The SMAJ series is engineered specifically for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 qualification, low clamping voltage, and repeatable surge endurance are mandatory.
FAQ
What is the clamping voltage of SMAJ7.5CAHM3_A/H at its rated peak pulse current?
The SMAJ7.5CAHM3_A/H has a maximum clamping voltage (VC) of 12.9 V when subjected to its rated peak pulse current (IPPM) of 31.0 A under the standard 10/1000 μs waveform. This value is measured at TA = 25 °C with the device mounted on 0.2" × 0.2" copper pads per Vishay Document 88390. The SMAJ7.5CAHM3_A/H maintains this clamping performance across its full operating temperature range due to its low VBR temperature coefficient of 0.067 %/°C.
Is SMAJ7.5CAHM3_A/H suitable for automotive applications?
Yes, SMAJ7.5CAHM3_A/H is AEC-Q101 qualified and explicitly designated for automotive use via its HM3 suffix (halogen-free, RoHS-compliant, and AEC-Q101 qualified). It meets stringent requirements for under-hood and chassis-mounted electronics, including thermal cycling, humidity resistance, and surge endurance. The SMAJ7.5CAHM3_A/H is commonly deployed in engine control units, body control modules, and ADAS sensor interfaces where bidirectional transient suppression is required.
How does the bidirectional design of SMAJ7.5CAHM3_A/H affect its circuit implementation?
The bidirectional construction of SMAJ7.5CAHM3_A/H eliminates polarity concerns during PCB layout - it can be placed across any two nodes requiring symmetrical overvoltage protection, such as differential signal pairs (RS-485, CAN), AC power rails, or ungrounded sensor outputs. Unlike unidirectional variants, SMAJ7.5CAHM3_A/H has no cathode marking and conducts equally in both directions above its breakdown threshold, simplifying design and reducing BOM complexity in balanced circuits.
What is the maximum reverse leakage current for SMAJ7.5CAHM3_A/H at its stand-off voltage?
The SMAJ7.5CAHM3_A/H exhibits a maximum reverse leakage current (ID) of 100 μA at its 7.5 V stand-off voltage (VWM), measured at TA = 25 °C. This low leakage ensures minimal impact on high-impedance sensor inputs or battery-powered circuits. Leakage remains within specification across the full -55 °C to +150 °C operating junction temperature range, supporting reliable operation in extreme environmental conditions.
Does SMAJ7.5CAHM3_A/H require special PCB layout considerations?
Yes - to achieve its rated 400 W peak pulse power, the SMAJ7.5CAHM3_A/H must be mounted on minimum recommended copper pad areas: 0.2" × 0.2" (5.0 mm × 5.0 mm) per terminal, per Vishay's thermal derating curves. Smaller pads reduce heat dissipation and cause premature thermal runaway during repetitive surges. The SMAJ7.5CAHM3_A/H also requires short, low-inductance traces to ground to preserve fast response time and minimize voltage overshoot during transient events.
SMAJ7.5CAHM3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ7.5CAHM3_A/H FAQ
1.How can I place an order for SMAJ7.5CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5CAHM3_A/H 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 SMAJ7.5CAHM3_A/H reliable?
The price and inventory of SMAJ7.5CAHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.5CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ7.5CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5CAHM3_A/H?
SMAJ7.5CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5CAHM3_A/H 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 SMAJ7.5CAHM3_A/H?
For technical support, including SMAJ7.5CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ7.5CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5CAHM3_A/H 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 SMAJ7.5CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ7.5CAHM3_A/H?
All SMAJ7.5CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5CAHM3_A/H, 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 SMAJ7.5CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ7.5CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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