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Vishay General Semiconductor - Diodes Division SMAJ7.5HE3/5A
- Part No.:
- SMAJ7.5HE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5HE3/5A.pdf
- Description:
- TVS DIODE 7.5VWM 14.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,183
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Product details
Overview
SMAJ7.5HE3/5A from Vishay General Semiconductor is a high-reliability, AEC-Q101-qualified unidirectional transient voltage suppressor (TVS) in DO-214AC (SMA) package, designed for automotive and industrial overvoltage protection. It features 7.5 V stand-off voltage (VWM), 8.33–10.2 V breakdown voltage (VBR at 1.0 mA), 14.3 V clamping voltage (VC) at 28.0 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - deployed on signal lines and power rails of automotive ECUs and sensor interfaces.
For engineers reviewing the SMAJ7.5HE3/5A datasheet, SMAJ7.5HE3/5A pinout, SMAJ7.5HE3/5A application, or SMAJ7.5HE3/5A equivalent, key selection criteria include its AEC-Q101 qualification, 150 °C maximum junction temperature, 1.0 µA max reverse leakage at VWM, RoHS-compliant matte tin terminals, and compatibility with automated SMT placement on 0.2 × 0.2" copper pads.
Technical Context
This unidirectional TVS diode uses a glass-passivated silicon junction to achieve fast response time (<1 ps) and low incremental surge resistance. Its clamping behavior is characterized by a well-defined VC/IPPM relationship under 10/1000 µs transients, with thermal derating per Fig. 2 above 25 °C ambient.
The device operates across –55 °C to +150 °C junction temperature range and meets MSL Level 1 per J-STD-020 (260 °C peak reflow). Its DO-214AC package supports solder dip at 260 °C for 40 s and complies with UL 94 V-0 flammability rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse working voltage before significant leakage; sets upper limit for protected circuit's normal operating voltage. |
| VBR (min/max) | 8.33 V / 10.2 V at 1.0 mA - Ensures reliable triggering above system nominal voltage while avoiding false conduction during transients. |
| VC @ IPPM | 14.3 V at 28.0 A - Clamped voltage seen by downstream ICs during 400 W surge; defines worst-case stress on protected load. |
| IPPM | 28.0 A - Peak surge current capability with 10/1000 µs waveform; determines survivability against ISO 7637-2 Pulse 1/2a/5a events. |
| PPPM | 400 W - Peak pulse power dissipation; validated on 0.2 × 0.2" copper pads, enabling robust protection without heatsinking. |
| TJ max. | +150 °C - Maximum junction temperature rating; supports operation in under-hood automotive environments. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance; informs board-level thermal design for repetitive surge conditions. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, unidirectional configuration with cathode band marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); weight: 0.064 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest-potential node; completes conduction path during reverse-biased transient clamp. |
| Cathode (banded end) | High-side transient input terminal | Connected to protected line (e.g., CAN_H, LIN, sensor supply); absorbs positive-going surges relative to anode. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
| Glass-passivated junction | Ensures stable VBR and low leakage over temperature and lifetime; improves humidity resistance vs. epoxy-passivated alternatives. |
| MSL Level 1 | Compatible with standard SMT reflow profiles up to 260 °C peak, eliminating moisture sensitivity handling requirements. |
| 400 W peak pulse power | Supports protection against severe transients such as load dump (ISO 16750-2) and inductive switching spikes in 12 V systems. |
| RoHS-compliant matte tin plating | Meets J-STD-002 and JESD22-B102 solderability standards; HE3 suffix passes JESD201 Class 2 whisker test for high-reliability use. |
Applications
| Automotive Sensor Protection | CAN Bus Line Protection |
|---|---|
|
Use Scenario: Protecting analog output sensors (e.g., pressure, temperature) in engine bay modules exposed to ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 5a (load dump). IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor supply rail and ground, clamping transients before they reach precision ADC front-end. Use Value: Limits voltage excursion to ≤14.3 V during 28 A surges, preserving sensor accuracy and preventing latch-up in 5 V or 3.3 V signal chains. |
Use Scenario: Safeguarding CAN transceivers (e.g., TJA1042, SN65HVD230) against ESD and coupled noise in vehicle networking. IC Role / Device Role / Timing Role: Bidirectional-capable layout option (though SMAJ7.5HE3/5A is unidirectional, used on VCC side); here applied on CAN_H line referenced to ground. Use Value: Clamps fast-rising transients (<1 ns rise time) without distorting 1 Mbps CAN signaling integrity due to low junction capacitance (~100 pF at 0 V). |
| Industrial PLC I/O Protection | Power Supply Input Clamp |
|
Use Scenario: Shielding digital input channels of programmable logic controllers from field-wiring induced surges in factory automation. IC Role / Device Role / Timing Role: TVS mounted at connector entry point, shunting energy from 24 V DC inputs to common ground before optocoupler or Schmitt trigger. Use Value: Withstands repeated 400 W pulses at 0.01% duty cycle, ensuring long-term reliability in harsh electromagnetic environments. |
Use Scenario: Secondary overvoltage clamp on 12 V DC-DC converter input, supplementing primary protection against upstream supply faults. IC Role / Device Role / Timing Role: Fast-acting crowbar element that activates within picoseconds when input exceeds 14.3 V, diverting fault current away from regulator IC. Use Value: Enables use of lower-voltage-rated input capacitors and MOSFETs by limiting transient overvoltage stress to safe levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5AHE3/5A | Lower VBR range (8.33–9.21 V), tighter tolerance; same VWM, VC = 12.9 V at 31.0 A. | Better suited for circuits requiring faster turn-on and lower clamping voltage at reduced surge current. | Select SMAJ7.5AHE3/5A when protecting low-voltage logic (e.g., 3.3 V microcontrollers) where 12.9 V clamp is critical. |
| SMAJ7.0HE3/5A | Lower VWM = 7.0 V, VBR = 7.78–9.51 V, VC = 13.3 V at 30.1 A; 400 W rating retained. | Designed for 5 V–7 V nominal rails; higher risk of leakage or false triggering in 7.5 V systems. | Choose SMAJ7.0HE3/5A only if system VCC is strictly ≤7.0 V and margin to VWM must be maximized. |
Compared with SMAJ7.5HE3/5A, SMAJ7.5AHE3/5A offers lower clamping (12.9 V vs. 14.3 V) at slightly reduced surge current (31.0 A vs. 28.0 A), while SMAJ7.0HE3/5A trades stand-off margin for tighter voltage alignment - making SMAJ7.5HE3/5A the optimal balance for 7.5 V automotive supply rails.
Availability
SMAJ7.5HE3/5A is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and 12 V DC power rail protection requiring stable component supply across extended temperature and lifecycle demands.
Supply support for SMAJ7.5HE3/5A 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 and passive components, specializing in high-reliability, application-engineered solutions for automotive, industrial, and computing markets.
The SMAJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for robust transient immunity in harsh environments - emphasizing AEC-Q101 compliance, stable parametric performance over temperature, and SMT manufacturability.
FAQ
What is the clamping voltage of SMAJ7.5HE3/5A and how is it measured?
The clamping voltage of SMAJ7.5HE3/5A is 14.3 V, measured at 28.0 A peak pulse current using a standardized 10/1000 µs double-exponential surge waveform. This value represents the maximum voltage imposed on the protected circuit during a worst-case transient event, verified under JEDEC test conditions with the device mounted on 0.2 × 0.2" copper pads. The SMAJ7.5HE3/5A maintains this clamping performance across its full operating temperature range.
Is SMAJ7.5HE3/5A suitable for automotive applications?
Yes, SMAJ7.5HE3/5A is explicitly qualified to AEC-Q101 for high-reliability automotive use. Its HE3 suffix denotes high-reliability/automotive grade, with validation for operation from –55 °C to +150 °C, MSL Level 1 reflow compatibility, and passing JESD201 Class 2 whisker testing. The SMAJ7.5HE3/5A is routinely deployed in engine control units, body control modules, and ADAS sensor interfaces where transient immunity is mission-critical.
How does SMAJ7.5HE3/5A differ from the standard SMAJ7.5E3/5A?
SMAJ7.5HE3/5A differs from SMAJ7.5E3/5A in qualification level and reliability testing: the "H" prefix indicates AEC-Q101 qualification and enhanced process controls for automotive-grade consistency, while the standard E3 version is commercial-grade. Both share identical electrical specs (VWM = 7.5 V, VC = 14.3 V), but SMAJ7.5HE3/5A undergoes additional stress screening and lot acceptance testing per automotive requirements - making SMAJ7.5HE3/5A the required choice for Tier 1 automotive designs.
What is the maximum reverse leakage current for SMAJ7.5HE3/5A at rated VWM?
The maximum reverse leakage current for SMAJ7.5HE3/5A is 1.0 µA at its rated stand-off voltage of 7.5 V and ambient temperature of 25 °C. This low leakage ensures minimal power loss and signal interference in always-on automotive and industrial monitoring circuits. Leakage remains below 10 µA up to +125 °C, supporting stable operation in high-temperature environments without compromising system efficiency.
Can SMAJ7.5HE3/5A be used in bi-directional protection configurations?
No, SMAJ7.5HE3/5A is a unidirectional TVS diode, intended for protection of DC lines referenced to ground. For true bi-directional protection (e.g., AC signal lines or differential buses), Vishay specifies CA-suffix parts like SMAJ7.5CA. Using SMAJ7.5HE3/5A in reverse-biased mode risks permanent damage, as its cathode-band construction and internal structure are optimized for single-polarity clamping - always verify polarity during PCB layout for SMAJ7.5HE3/5A.
SMAJ7.5HE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 14.3V
- Current - Peak Pulse (10/1000µs):
- 28A
- 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)
SMAJ7.5HE3/5A FAQ
1.How can I place an order for SMAJ7.5HE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5HE3/5A 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 SMAJ7.5HE3/5A reliable?
The price and inventory of SMAJ7.5HE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.5HE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ7.5HE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5HE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5HE3/5A?
SMAJ7.5HE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5HE3/5A 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 SMAJ7.5HE3/5A?
For technical support, including SMAJ7.5HE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5HE3/5A requirements.
6.How does Aetrix verify that SMAJ7.5HE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5HE3/5A 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 SMAJ7.5HE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ7.5HE3/5A?
All SMAJ7.5HE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5HE3/5A, 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 SMAJ7.5HE3/5A part is unused and in its original packaging.
Return procedure for SMAJ7.5HE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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