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Vishay General Semiconductor - Diodes Division SMAJ7.5AHM3_A/H
- Part No.:
- SMAJ7.5AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5AHM3_A/H.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,472
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Product details
Overview
SMAJ7.5AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal 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, 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 SMAJ7.5AHM3_A/H datasheet, SMAJ7.5AHM3_A/H pinout, SMAJ7.5AHM3_A/H application, or SMAJ7.5AHM3_A/H equivalent, key selection criteria include unidirectional polarity, 12.9 V clamping performance at 31 A surge, AEC-Q101 qualification status, halogen-free RoHS compliance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a fast-acting shunt protector: under normal bias it presents high impedance (>100 MΩ at 7.5 V), but triggers into low-impedance conduction when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance and low leakage (≤100 μA at VWM).
The device is rated for repetitive 10/1000 μs surges at 0.01% duty cycle (400 W up to 78 V; derated to 300 W above), with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), enabling reliable operation up to 150 °C junction temperature in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - maximum continuous reverse operating voltage before significant leakage begins; defines safe working margin for 5 V–12 V rail protection. |
| VBR min/max | 8.33 V / 9.21 V at 1.0 mA - tight breakdown window ensures predictable turn-on across temperature and production lot. |
| VC @ IPPM | 12.9 V at 31.0 A - clamping voltage during worst-case 10/1000 μs surge; limits downstream voltage stress to <13 V. |
| PPPM | 400 W - peak transient energy absorption capability with standard 10/1000 μs waveform; sufficient for ISO 7637-2 Pulse 1/2a/5a. |
| ID @ VWM | ≤100 μA - ultra-low reverse leakage preserves system standby power integrity in battery-powered sensors. |
| TJ max | +150 °C - supports under-hood automotive environments and industrial enclosures without derating. |
| Package | SMA (DO-214AC) - industry-standard 2-pin surface-mount outline with cathode band marking; compatible with JEDEC J-STD-020 MSL level 1. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, 0.208" × 0.157" footprint, 0.078" nominal lead width, cathode indicated by black band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes conduction path during transient clamp event. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 12 V supply or CAN_H); carries full surge current into anode during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness per JESD22 standards. |
| Halogen-free & RoHS-compliant | HM3 suffix confirms compliance with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU; no brominated flame retardants. |
| 400 W peak pulse power | Withstands 10/1000 μs transients up to 31 A without degradation - meets ISO 16750-2 and SAE J1113-11 surge immunity requirements. |
| Fast response time & low clamping ratio | Sub-nanosecond response plus VC/VBR ≈ 1.55 enables effective protection of 3.3 V–12 V logic and analog front-ends. |
| MSL Level 1 moisture sensitivity | Can be reflowed at peak 260 °C without baking; eliminates pre-conditioning delays in high-volume SMT assembly. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppressing load-dump and jump-start transients on 12 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between battery rail and local regulator input. Use Value: Clamps 12 V rail to ≤12.9 V during 35 V/100 ms load dump, preventing damage to LDOs and microcontrollers. |
Use Scenario: Protecting analog outputs of pressure/temperature sensors connected to PLC analog inputs. IC Role / Device Role / Timing Role: Low-leakage TVS on 4–20 mA loop or 0–10 V output line, mounted adjacent to connector. Use Value: Limits induced surges from nearby motor switching to <13 V, preserving ADC reference integrity and sensor accuracy. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feeding Line |
|
Use Scenario: Safeguarding primary-side controller ICs in AC/DC adapters against AC line surges and EFT. IC Role / Device Role / Timing Role: Standoff-rated TVS across bulk capacitor input, triggered only during >7.5 V excursions. Use Value: Prevents latch-up or gate oxide rupture in PWM controllers during 1 kV/500 A combination wave surges. |
Use Scenario: Shielding PoE-powered equipment (e.g., IP cameras) from longitudinal surges on 48 V DC feed lines. IC Role / Device Role / Timing Role: Unidirectional TVS on +48 V line referenced to chassis ground, upstream of DC/DC converter. Use Value: Absorbs 400 W surge energy while holding voltage below 13 V, avoiding overvoltage shutdown of PD interface ICs. |
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_A/H | Same electrical specs, but RoHS-compliant with brominated flame retardant; not halogen-free. | Acceptable for commercial/industrial use where halogen-free requirement is waived. | Select SMAJ7.5AHM3_A/H when halogen-free compliance is mandated (e.g., EU public infrastructure projects). |
| SMBJ7.5A-HM3 | Higher 600 W PPPM rating, SMB (DO-214AA) package - larger footprint, lower thermal resistance (RθJA = 80 °C/W). | Better suited for higher-energy transients or thermally constrained designs requiring lower junction rise. | Choose SMBJ7.5A-HM3 if system-level testing reveals 400 W insufficient or board layout allows larger package. |
Compared with SMAJ7.5AHE3_A/H, SMAJ7.5AHM3_A/H adds halogen-free certification without sacrificing clamping or surge performance; versus SMBJ7.5A-HM3, it trades 200 W pulse headroom and thermal margin for space-constrained layouts where SMA footprint is mandatory.
Availability
SMAJ7.5AHM3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom power feeding applications requiring stable component supply, long-term lifecycle support, and AEC-Q101 validated reliability.
Supply support for SMAJ7.5AHM3_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 robust transient suppression in harsh environments - targeting automotive, industrial, and communications systems where failure due to voltage surges must be eliminated.
FAQ
What is the clamping voltage of SMAJ7.5AHM3_A/H at its rated peak pulse current?
The SMAJ7.5AHM3_A/H has a maximum clamping voltage (VC) of 12.9 V at 31.0 A peak pulse current (IPPM), measured with a 10/1000 μs waveform. This value is guaranteed across temperature and production lots per Vishay Document 88390, ensuring consistent overvoltage protection for downstream 12 V logic and analog circuitry. The SMAJ7.5AHM3_A/H maintains this clamping performance up to +150 °C junction temperature.
Is SMAJ7.5AHM3_A/H qualified for automotive applications?
Yes, SMAJ7.5AHM3_A/H is AEC-Q101 qualified, as confirmed by the HM3 suffix and Vishay's ordering information table (Document 88390, page 3). It undergoes stress testing including temperature cycling, high-temperature reverse bias, and ESD per JESD22 standards. The SMAJ7.5AHM3_A/H is intended for under-hood and chassis-mounted modules where transient immunity and long-term reliability are critical.
How does the HM3 suffix differ from E3 or HE3 in SMAJ7.5AHM3_A/H?
The HM3 suffix in SMAJ7.5AHM3_A/H denotes halogen-free, RoHS-compliant construction meeting IEC 61249-2-21, whereas E3 is RoHS-compliant with brominated flame retardant, and HE3 adds AEC-Q101 qualification to E3. SMAJ7.5AHM3_A/H combines halogen-free material with AEC-Q101 qualification - verified in Vishay's ordering table. All three share identical electrical parameters and SMA package dimensions.
What is the maximum reverse leakage current for SMAJ7.5AHM3_A/H at its stand-off voltage?
The SMAJ7.5AHM3_A/H exhibits a maximum reverse leakage current (ID) of 100 μA at its 7.5 V stand-off voltage (VWM), tested at TA = 25 °C. This low leakage preserves power integrity in always-on sensor nodes and battery-backed systems. Data is specified in the Electrical Characteristics table (Document 88390, page 2) and remains stable across -55 °C to +125 °C ambient range.
Can SMAJ7.5AHM3_A/H be used in bidirectional configurations?
No, SMAJ7.5AHM3_A/H is unidirectional only, as indicated by the "A" suffix and cathode band marking. Bidirectional variants use the "CA" suffix (e.g., SMAJ7.5CA). Using SMAJ7.5AHM3_A/H in reverse-biased configurations risks permanent failure due to forward conduction during negative transients. For bidirectional protection, select SMAJ7.5CA-HM3 or equivalent.
SMAJ7.5AHM3_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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ7.5AHM3_A/H FAQ
1.How can I place an order for SMAJ7.5AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5AHM3_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 SMAJ7.5AHM3_A/H reliable?
The price and inventory of SMAJ7.5AHM3_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 SMAJ7.5AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ7.5AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5AHM3_A/H?
SMAJ7.5AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5AHM3_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 SMAJ7.5AHM3_A/H?
For technical support, including SMAJ7.5AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5AHM3_A/H requirements.
6.How does Aetrix verify that SMAJ7.5AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5AHM3_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 SMAJ7.5AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ7.5AHM3_A/H?
All SMAJ7.5AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5AHM3_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 SMAJ7.5AHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ7.5AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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