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Vishay General Semiconductor - Diodes Division SMAJ7.5CAHE3_A/H
- Part No.:
- SMAJ7.5CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5CAHE3_A/H.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,970
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Product details
Overview
SMAJ7.5CAHE3_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 a 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 signal lines in automotive and industrial control systems.
For engineers reviewing the SMAJ7.5CAHE3_A/H datasheet, SMAJ7.5CAHE3_A/H pinout, SMAJ7.5CAHE3_A/H application, or SMAJ7.5CAHE3_A/H equivalent, key selection considerations include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.55), MSL Level 1 moisture sensitivity, and compatibility with automated SMT assembly on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamping protector with symmetrical avalanche breakdown in both directions, enabling robust surge suppression without polarity constraints. Its glass-passivated junction ensures stable leakage performance (<100 μA at VWM) and fast response time (<1.0 ps), while the low incremental surge resistance supports effective energy diversion during transient events.
The SMAJ7.5CAHE3_A/H is rated for 400 W peak pulse power (derated to 300 W above 78 V), with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead). It meets J-STD-020 MSL Level 1 and is qualified to AEC-Q101 for automotive underhood and body electronics applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR min/max | 8.33 V / 9.21 V at IT = 1.0 mA - Confirmed breakdown threshold window ensuring reliable turn-on during overvoltage events. |
| VC @ IPPM | 12.9 V at 31.0 A - Clamped voltage seen by downstream components during 10/1000 μs surge; determines protection margin. |
| PPPM | 400 W (10/1000 μs) - Peak transient energy handling capacity; sufficient for IEC 61000-4-5 Level 3 surges. |
| ID @ VWM | ≤100 μA - Low reverse leakage preserves signal integrity and minimizes standby power loss in high-impedance nodes. |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.28 mm × 4.50 mm footprint and 2.29 mm height; compatible with JEDEC-compliant reflow profiles. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1, RoHS-compliant and AEC-Q101 qualified. Polarity marking: none for bidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | One terminal of symmetrical PN junction; accepts surge current in either direction during clamping. |
| Cathode | Transient current exit (bidirectional) | Second terminal of symmetrical PN junction; completes low-impedance path to ground or rail during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, body controllers, and ADAS sensor interfaces. |
| 400 W peak pulse power | Handles repetitive 10/1000 μs transients up to 0.01% duty cycle - suitable for load dump and inductive switching events. |
| Low clamping ratio (VC/VBR ≈ 1.55) | Minimizes voltage overshoot across protected ICs, improving margin against absolute maximum ratings. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow without baking; simplifies manufacturing logistics. |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and microcontroller GPIOs from load-dump-induced spikes in door module ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between LIN line and ground, responding within picoseconds to suppress >100 V transients. Use Value: Prevents latch-up or permanent damage to 5 V tolerant transceivers by limiting line voltage to ≤12.9 V during 300 V/50 ms load dump events. |
Use Scenario: Safeguarding analog outputs of pressure sensors connected to PLC analog input cards in factory automation. IC Role / Device Role / Timing Role: Standoff protector on 4–20 mA current loop output, clamping ESD and switching noise on field wiring. Use Value: Maintains signal fidelity below 7.5 V normal operation while suppressing ±15 kV contact ESD per IEC 61000-4-2 with <100 μA leakage. |
| Consumer Appliance Motor Drive | Telecom Power Supply Input Stage |
|
Use Scenario: Shielding MCU-based BLDC motor controllers from back-EMF spikes generated by brushless fan motors. IC Role / Device Role / Timing Role: Clamp across DC bus rails near gate drivers, activated only during >12.9 V overvoltage conditions. Use Value: Eliminates need for bulkier MOVs or multi-stage protection, reducing BOM count while sustaining 400 W surge capability. |
Use Scenario: Secondary-side transient suppression on +12 V bias rail feeding PoE-powered Ethernet switches. IC Role / Device Role / Timing Role: Fast-acting shunt element parallel to LDO input, diverting induced lightning surges from upstream DC/DC converter. Use Value: Ensures uninterrupted operation during 1 kV/0.5 J surges per IEC 61000-4-5, with no degradation after ≥1000 pulses. |
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-E3/61 | Same electrical specs and SMA package; RoHS-compliant commercial grade without AEC-Q101 qualification. | Lacks automotive qualification; suitable for consumer/industrial designs where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive reliability requirements and qualification documentation is unnecessary. |
| SMBJ7.5CAHE3_A/H | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package with higher 600 W PPPM rating and 43.5 A IPPM. | Offers greater surge margin and lower thermal resistance (RθJA = 80 °C/W); requires larger PCB area. | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 3 or when extended lifetime under repeated transients is critical. |
Compared with SMAJ7.5CAHE3_A/H, SMAJ7.5CA-E3/61 reduces qualification overhead but forfeits automotive traceability, while SMBJ7.5CAHE3_A/H trades board space for higher surge endurance and improved thermal performance in high-reliability power rails.
Availability
SMAJ7.5CAHE3_A/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, consumer appliance motor drives, and telecom power supply protection requiring stable component supply and full AEC-Q101 compliance.
Supply support for SMAJ7.5CAHE3_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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-speed transient suppression in space-constrained, high-reliability applications - particularly targeting automotive, industrial, and communications systems needing robust, standardized, and qualification-ready protection devices.
FAQ
What does the "CA" suffix indicate in SMAJ7.5CAHE3_A/H?
The "CA" suffix denotes a bidirectional configuration, meaning SMAJ7.5CAHE3_A/H provides symmetrical clamping in both forward and reverse directions. This eliminates polarity concerns during placement and enables protection of AC-coupled or floating signal paths - unlike unidirectional "A" variants that require correct cathode orientation relative to ground.
Is SMAJ7.5CAHE3_A/H suitable for protecting USB data lines?
No - SMAJ7.5CAHE3_A/H is not optimized for high-speed data line protection due to its relatively high junction capacitance (>100 pF at VWM) and clamping voltage (12.9 V), which exceed USB 2.0/3.0 signal swing limits. For USB, low-capacitance TVS arrays such as USBLC6-2SC6 are recommended instead of SMAJ7.5CAHE3_A/H.
How does the AEC-Q101 qualification impact the use of SMAJ7.5CAHE3_A/H?
AEC-Q101 qualification confirms SMAJ7.5CAHE3_A/H has passed stress tests for temperature cycling, humidity, mechanical shock, and high-temperature operating life - making it acceptable for automotive under-hood and cabin applications. This certification is mandatory for Tier 1 suppliers and required in functional safety documentation for ASIL-B systems using SMAJ7.5CAHE3_A/H.
What is the maximum allowable PCB pad size for optimal thermal performance of SMAJ7.5CAHE3_A/H?
For rated 400 W peak pulse power, Vishay specifies mounting SMAJ7.5CAHE3_A/H on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Larger pads improve heat dissipation and sustain repetitive surges; however, exceeding 0.3" × 0.3" offers diminishing returns due to the device's inherent RθJA of 120 °C/W.
Can SMAJ7.5CAHE3_A/H be used in parallel to increase surge current handling?
No - SMAJ7.5CAHE3_A/H should not be paralleled without external balancing resistors, as minor VBR tolerances (±5%) cause uneven current sharing. Uneven distribution risks thermal runaway in one device. For higher IPPM, select a single higher-rated part like SMBJ7.5CAHE3_A/H instead of paralleling SMAJ7.5CAHE3_A/H units.
SMAJ7.5CAHE3_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:
- -
- 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_A/H FAQ
1.How can I place an order for SMAJ7.5CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5CAHE3_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 SMAJ7.5CAHE3_A/H reliable?
The price and inventory of SMAJ7.5CAHE3_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 SMAJ7.5CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ7.5CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5CAHE3_A/H?
SMAJ7.5CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5CAHE3_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 SMAJ7.5CAHE3_A/H?
For technical support, including SMAJ7.5CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5CAHE3_A/H requirements.
6.How does Aetrix verify that SMAJ7.5CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5CAHE3_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 SMAJ7.5CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ7.5CAHE3_A/H?
All SMAJ7.5CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5CAHE3_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 SMAJ7.5CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ7.5CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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