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Vishay General Semiconductor - Diodes Division SMAJ7.0AHM3/I
- Part No.:
- SMAJ7.0AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.0AHM3/I.pdf
- Description:
- TVS DIODE 7VWM 12VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ7.0AHM3/I 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 7.0 V stand-off voltage (VWM), 7.78–8.60 V breakdown voltage (VBR) at 10 mA, 12.0 V maximum clamping voltage (VC) at 33.3 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), commonly deployed to protect MOSFETs and ICs in automotive power supplies.
For engineers reviewing the SMAJ7.0AHM3/I datasheet, SMAJ7.0AHM3/I pinout, SMAJ7.0AHM3/I application, or SMAJ7.0AHM3/I equivalent, key selection criteria include clamping voltage margin relative to protected device's absolute maximum rating, thermal resistance (RθJA = 120 °C/W), unidirectional polarity marking, AEC-Q101 qualification status, and halogen-free RoHS compliance indicated by the HM3 suffix.
Technical Context
This TVS diode operates as a voltage-clamping protection device that enters avalanche conduction when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable leakage performance and fast response time (<1 ns), while the SMA package supports automated placement and meets MSL level 1 reflow profile (260 °C peak).
The SMAJ7.0AHM3/I is rated for -55 °C to +150 °C operating junction temperature, with 3.3 W steady-state power dissipation on infinite heatsink at 50 °C ambient. Its 40 A IFSM rating supports robust surge handling during inductive load switching events, and its 0.065 %/°C VBR temperature coefficient enables predictable clamping behavior across temperature extremes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V - Maximum continuous reverse operating voltage before clamping begins; must exceed normal circuit operating voltage to avoid leakage-induced power loss. |
| VBR min/max | 7.78 V / 8.60 V at 10 mA - Confirmed breakdown range defines turn-on threshold; ensures reliable clamping onset without premature conduction. |
| VC @ IPPM | 12.0 V at 33.3 A - Clamped voltage under 10/1000 μs surge; must remain below protected IC's absolute maximum input rating. |
| PPPM | 400 W - Peak pulse power handling capability; determines survivability against standardized lightning/surge waveforms. |
| ID @ VWM | 200 μA max - Reverse leakage at stand-off voltage; low value minimizes standby power loss in battery-powered systems. |
| TJ max | +150 °C - Maximum junction temperature; sets thermal derating limit for sustained surge duty cycles. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance; used to calculate temperature rise under DC bias or repetitive surges. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads; cathode indicated by band on one end; footprint matches JEDEC DO-214AC standard (5.28 mm × 4.50 mm × 2.29 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to lower-potential side of protected line; forms forward-biased path only during fault conditions with reverse polarity. |
| Cathode | Reverse voltage reference terminal | Marked end; connected to higher-potential side (e.g., VBUS); conducts avalanche current when transient exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing-enables use in engine control units and ADAS power rails. |
| Halogen-free & RoHS-compliant (HM3) | Meets IPC-4101D/21 and JEDEC J-STD-020 MSL level 1; supports lead-free reflow assembly without compromising flame retardancy (UL 94 V-0). |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surge (4 kV line-earth) when properly mounted on 5.0 mm × 5.0 mm copper pads per terminal. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Ensures minimal overvoltage stress on downstream components-critical for protecting 5 V logic interfaces and 12 V automotive sensors. |
| Fast response time (<1 ns) | Clamps transients before they propagate through PCB traces; eliminates need for additional RC filtering in high-speed signal protection. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply inputs of body control modules (BCM) against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND to clamp positive-going transients above 13.5 V. Use Value: Limits clamped voltage to 12.0 V, staying safely below 16 V absolute max rating of typical automotive LDO regulators. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) of pressure sensors in factory automation PLCs. IC Role / Device Role / Timing Role: TVS connected across sensor output and return to suppress ESD and inductive kickback from nearby solenoid switching. Use Value: Sub-1 ns response prevents latch-up in op-amp front-ends; 200 μA leakage avoids calibration drift in precision current sources. |
| Consumer USB Port ESD Protection | Telecom DC Power Input Protection |
|
Use Scenario: Adding secondary surge immunity to USB VBUS line in portable docking stations alongside primary polymer PTC. IC Role / Device Role / Timing Role: Unidirectional TVS placed upstream of USB controller IC to absorb contact ESD (IEC 61000-4-2 ±15 kV) and cable discharge events. Use Value: 12.0 V clamping prevents damage to 5.5 V tolerant USB PHY transceivers; SMA package allows compact layout near connector. |
Use Scenario: Protecting -48 V DC telecom power feeds in remote radio units (RRUs) against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: TVS configured in series with current-limiting resistor to handle differential-mode surges on -48 V rail relative to chassis ground. Use Value: 400 W pulse rating sustains multiple 10/1000 μs surges up to 33.3 A; AEC-Q101 qualification validates long-term field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.0AHE3/I | Same electrical specs but RoHS-compliant commercial grade (E3), not halogen-free; lacks AEC-Q101 qualification. | Approved for industrial/commercial designs where automotive qualification is unnecessary and halogen content is unrestricted. | Select SMAJ7.0AHE3/I for cost-sensitive non-automotive applications requiring same clamping performance without halogen-free mandate. |
| SMBJ7.0A-M3 | Higher 600 W PPPM rating, larger SMB (DO-214AA) package (5.28 mm × 4.57 mm), identical VWM/VBR/VC specs. | Better thermal performance (RθJA = 80 °C/W) suits high-repetition surge environments; requires larger PCB footprint. | Choose SMBJ7.0A-M3 when system-level surge testing exceeds 400 W or board layout allows larger package for improved thermal margin. |
Compared with SMAJ7.0AHM3/I, SMAJ7.0AHE3/I offers identical protection performance without halogen-free or automotive qualification, while SMBJ7.0A-M3 delivers higher surge capacity in a physically larger package-making SMAJ7.0AHM3/I optimal for space-constrained AEC-Q101-compliant automotive designs needing halogen-free compliance.
Availability
SMAJ7.0AHM3/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom power input circuits requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ7.0AHM3/I 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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was engineered for high-reliability transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where consistent clamping performance and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMAJ7.0AHM3/I at its rated peak pulse current?
The SMAJ7.0AHM3/I has a maximum clamping voltage (VC) of 12.0 V when subjected to its rated peak pulse current (IPPM) of 33.3 A under a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and ensures the protected circuit remains within safe operating limits during surge events. The 12.0 V clamping level is confirmed in the Vishay datasheet revision 09-Jan-2024, page 2, Electrical Characteristics table.
Is SMAJ7.0AHM3/I qualified for automotive applications?
Yes, SMAJ7.0AHM3/I is AEC-Q101 qualified, as indicated by the "HM3" suffix (halogen-free, RoHS-compliant, and AEC-Q101 qualified). This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD, validating its suitability for under-hood and ADAS applications. The qualification status is explicitly stated in the Vishay ordering information table on page 3 of document 88390.
What does the "HM3" suffix mean in SMAJ7.0AHM3/I?
The "HM3" suffix in SMAJ7.0AHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from E3 (RoHS-compliant commercial grade) and HE3 (RoHS-compliant + AEC-Q101, but not halogen-free). The HM3 version satisfies environmental requirements for automotive and green electronics programs where brominated flame retardants are prohibited.
How does SMAJ7.0AHM3/I compare to SMAJ7.0A-M3 in terms of specifications?
SMAJ7.0AHM3/I and SMAJ7.0A-M3 share identical electrical parameters-including VWM (7.0 V), VBR (7.78–8.60 V), VC (12.0 V), and PPPM (400 W)-but differ in qualification: HM3 adds AEC-Q101 certification and halogen-free compliance, whereas M3 is RoHS-compliant commercial grade without automotive qualification. Both use the same SMA (DO-214AC) package and mounting footprint.
What is the maximum reverse leakage current for SMAJ7.0AHM3/I at its stand-off voltage?
The maximum reverse leakage current (ID) for SMAJ7.0AHM3/I is 200 μA at its 7.0 V stand-off voltage (VWM), measured at 25 °C ambient. This low leakage ensures minimal power loss in always-on circuits such as automotive wake-up lines or battery-backed sensor nodes. The value is specified in the Electrical Characteristics table (page 2, document 88390) under the "MAXIMUM REVERSE LEAKAGE AT VWM" column for device SMAJ7.0A.
SMAJ7.0AHM3/I 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 7V
- Voltage - Breakdown (Min):
- 7.78V
- Voltage - Clamping (Max) @ Ipp:
- 12V
- Current - Peak Pulse (10/1000µs):
- 33.3A
- 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)
SMAJ7.0AHM3/I FAQ
1.How can I place an order for SMAJ7.0AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.0AHM3/I 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 SMAJ7.0AHM3/I reliable?
The price and inventory of SMAJ7.0AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.0AHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ7.0AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.0AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.0AHM3/I?
SMAJ7.0AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.0AHM3/I 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 SMAJ7.0AHM3/I?
For technical support, including SMAJ7.0AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.0AHM3/I requirements.
6.How does Aetrix verify that SMAJ7.0AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ7.0AHM3/I 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 SMAJ7.0AHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ7.0AHM3/I?
All SMAJ7.0AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.0AHM3/I, 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 SMAJ7.0AHM3/I part is unused and in its original packaging.
Return procedure for SMAJ7.0AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ7.0AHM3/I Tags
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