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Vishay General Semiconductor - Diodes Division SMAJ7.5A-M3/61
- Part No.:
- SMAJ7.5A-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5A-M3/61.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,196
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Product details
Overview
SMAJ7.5A-M3/61 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 DC power rails and signal lines. It features a 7.5 V stand-off voltage (VWM), 8.33–9.21 V breakdown voltage (VBR) at 1 mA, 12.9 V maximum clamping voltage (VC) at 31.0 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform). It is widely used to protect MOSFET gates, microcontroller I/O pins, and sensor interfaces in automotive body electronics.
For engineers reviewing the SMAJ7.5A-M3/61 datasheet, SMAJ7.5A-M3/61 pinout, SMAJ7.5A-M3/61 application, or SMAJ7.5A-M3/61 equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, thermal resistance (RθJA = 120 °C/W), unidirectional polarity marking (cathode band), and halogen-free RoHS compliance per M3 suffix - critical for automotive and industrial PCB assembly with lead-free reflow profiles.
Technical Context
This TVS diode operates as a fast-acting shunt clamp: under normal bias (≤7.5 V), it draws ≤100 μA reverse leakage; when transient voltage exceeds ~8.33 V, it avalanches and clamps the line to ≤12.9 V within <1 ns. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance, enabling reliable suppression of ESD (IEC 61000-4-2) and inductive switching spikes (e.g., relay coil flyback).
The SMAJ7.5A-M3/61 is rated for -55 °C to +150 °C operating junction temperature, supports 40 A non-repetitive forward surge (8.3 ms half-sine), and meets J-STD-020 MSL Level 1 - allowing unlimited floor life and compatibility with standard SMT reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 7.5 V - Maximum continuous reverse voltage before significant leakage; sets upper limit for protected circuit's nominal DC rail. |
| VBR (Breakdown Voltage) | 8.33–9.21 V at 1.0 mA - Confirmed avalanche onset range; ensures reliable triggering above system operating voltage with margin. |
| VC (Clamping Voltage) | 12.9 V at 31.0 A (10/1000 μs) - Peak voltage seen by downstream IC during worst-case surge; must be below IC's absolute max rating. |
| PPPM (Peak Pulse Power) | 400 W - Sustained energy absorption capability for standardized lightning/surge waveforms; derates to 300 W above 78 V. |
| ID (Reverse Leakage) | 100 μA max at 7.5 V - Low quiescent loss on power rails; avoids unnecessary current drain in battery-powered systems. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on 0.2" × 0.2" copper pads; determines required board copper area for thermal management. |
| Polarity | Unidirectional with cathode band - Requires correct orientation in series with positive rail; not interchangeable with bidirectional variants. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant (M3 suffix), matte tin-plated leads solderable per J-STD-002. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); cathode marked by single band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes clamping loop when transient exceeds VBR. |
| Cathode | High-side connection point | Connected to protected line (e.g., 5 V rail); polarity band identifies this terminal; reverse-biased during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against ISO 7637-2 Pulse 1/2a/5a surges and IEC 61000-4-5 combination wave events on 12 V automotive subsystems. |
| 12.9 V clamping at 31 A | Provides ≥1.5 V margin below typical 14 V logic IC absolute maximum ratings (e.g., STM32 GPIO), preventing latch-up or oxide damage. |
| Fast response time (<1 ns) | Clamps transients before propagation across PCB traces or into sensitive analog front-ends such as ADC reference inputs or op-amp sensors. |
| MSL Level 1, 260 °C peak reflow | Eliminates moisture sensitivity concerns and enables direct placement on high-volume SMT lines without baking or special handling. |
| Halogen-free (M3 suffix) | Meets automotive OEM material declarations (e.g., GMW3172, Ford WSS-M99P9999-A1) and supports flame-retardant board designs per UL 94 V-0. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protecting 12 V supply input of BCM microcontroller from load-dump transients (ISO 16750-2) and alternator ripple. IC Role / Device Role / Timing Role: Shunt-clamp TVS placed directly at MCU power pin, triggered within nanoseconds to limit voltage excursion. Use Value: Prevents brownout resets and gate oxide failure during 35 V/100 ms load dump events by clamping to 12.9 V at peak surge current. |
Use Scenario: Safeguarding 24 V digital input optocoupler interface against field-wiring induced surges and ESD contact discharge. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input node upstream of series current-limiting resistor and opto-LED. Use Value: Maintains optocoupler LED forward voltage integrity by limiting transient overshoot to ≤12.9 V, avoiding LED degradation or false triggering. |
| Consumer Appliance Motor Driver Board | Telecom Remote Sensor Node |
Use Scenario: Clamping flyback voltage from brushed DC motor commutation spikes on H-bridge high-side FET source node. IC Role / Device Role / Timing Role: Unidirectional TVS tied between motor supply rail and ground, absorbing inductive kickback energy. Use Value: Extends MOSFET lifetime by limiting VDS stress to 12.9 V during 31 A transient peaks, reducing avalanche energy dissipation in the FET itself. |
Use Scenario: Protecting RS-485 transceiver data lines (A/B) from lightning-induced common-mode surges in outdoor metering installations. IC Role / Device Role / Timing Role: Paired unidirectional TVS devices (one per line) referenced to local ground, providing asymmetric surge diversion. Use Value: Enables compliance with IEC 61000-4-5 Level 3 (1 kV line-ground) while preserving signal integrity via low capacitance (<100 pF) and sub-1 ns response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5A-E3/61 | Same electrical specs, but RoHS-compliant commercial grade (not halogen-free); uses standard SnPb-compatible matte tin plating. | Approved for general industrial use; not qualified for halogen-free mandates in automotive Tier-1 BOMs. | Select when halogen content is unrestricted and cost optimization is prioritized over material compliance documentation. |
| SMAJ7.5CA-M3/61 | Bidirectional variant: symmetric VBR (8.33–9.21 V) and VC (12.9 V), no polarity marking; same package and power rating. | Required for AC-coupled or floating signal lines (e.g., USB D+/D−, CAN H/L) where polarity reversal may occur. | Choose only if circuit lacks defined DC bias polarity; unidirectional SMAJ7.5A-M3/61 offers lower leakage and tighter VWM tolerance for DC rails. |
Compared with SMAJ7.5A-E3/61, the M3 suffix adds halogen-free certification critical for automotive PPAP; compared with SMAJ7.5CA-M3/61, the unidirectional version provides superior leakage control and eliminates ambiguity in DC-coupled power rail protection.
Availability
SMAJ7.5A-M3/61 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input protection, consumer appliance motor drives, and telecom remote sensor nodes requiring stable component supply across multi-year production cycles.
Supply support for SMAJ7.5A-M3/61 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 power MOSFETs with emphasis on reliability, AEC-Q101 qualification, and automotive-grade manufacturing.
The SMAJ series was engineered specifically for high-energy transient suppression in harsh environments - targeting 12 V/24 V automotive, industrial control, and communications infrastructure where robustness and repeatable clamping performance are mandatory.
FAQ
What is the maximum clamping voltage of the SMAJ7.5A-M3/61 under a 10/1000 μs surge?
The SMAJ7.5A-M3/61 has a maximum clamping voltage (VC) of 12.9 V at 31.0 A peak pulse current with a 10/1000 μs waveform. This value is measured per JEDEC standards and represents the highest voltage the device allows to pass through to the protected circuit during that specific transient event. Designers must verify that 12.9 V remains safely below the absolute maximum voltage rating of downstream components in their SMAJ7.5A-M3/61-protected circuit.
Does the SMAJ7.5A-M3/61 meet automotive qualification requirements?
The SMAJ7.5A-M3/61 is halogen-free and RoHS-compliant but is not AEC-Q101 qualified - that status applies only to variants with HE3 or HM3 suffixes (e.g., SMAJ7.5AHE3_A). The M3 suffix indicates commercial-grade reliability with material compliance; for automotive safety-critical modules, users must select the HE3/HM3 versions and confirm qualification status via Vishay's official part numbering matrix. SMAJ7.5A-M3/61 remains suitable for non-safety automotive subsystems like infotainment power rails.
How does the SMAJ7.5A-M3/61 differ from the SMAJ7.5CA-M3/61?
The SMAJ7.5A-M3/61 is unidirectional with a cathode band marking and specified parameters for reverse-bias operation only, while the SMAJ7.5CA-M3/61 is bidirectional - symmetrical in both directions with no polarity marking and identical VBR/VC in either polarity. The unidirectional version exhibits lower reverse leakage (100 μA vs. 200 μA for CA types ≤10 V), making SMAJ7.5A-M3/61 preferable for DC power rail protection where leakage current impacts efficiency or battery life.
What is the thermal resistance of the SMAJ7.5A-M3/61, and how does it affect layout?
The SMAJ7.5A-M3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimal copper; increasing pad area or adding internal ground planes reduces RθJA, lowering junction temperature rise during repetitive surges. For sustained surge duty cycles >0.01%, designers should calculate ΔTJ = PPPM × RθJA and ensure TJ stays ≤150 °C - requiring enhanced copper pour or thermal vias for the SMAJ7.5A-M3/61 in high-density layouts.
Can the SMAJ7.5A-M3/61 be used in place of a Zener diode for overvoltage protection?
No - the SMAJ7.5A-M3/61 is not a replacement for a Zener diode in regulation applications. It is optimized for transient suppression: it conducts heavily only during high-current, short-duration surges (e.g., 31 A for microseconds), not for steady-state voltage regulation. Its leakage current (100 μA) and dynamic impedance are not characterized for DC bias stability. For continuous overvoltage clamping, a properly rated Zener or dedicated OVP IC is required; the SMAJ7.5A-M3/61 serves exclusively as a surge absorber, not a regulator.
SMAJ7.5A-M3/61 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ7.5A-M3/61 FAQ
1.How can I place an order for SMAJ7.5A-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5A-M3/61 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 SMAJ7.5A-M3/61 reliable?
The price and inventory of SMAJ7.5A-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.5A-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ7.5A-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5A-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5A-M3/61?
SMAJ7.5A-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5A-M3/61 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 SMAJ7.5A-M3/61?
For technical support, including SMAJ7.5A-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5A-M3/61 requirements.
6.How does Aetrix verify that SMAJ7.5A-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5A-M3/61 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 SMAJ7.5A-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ7.5A-M3/61?
All SMAJ7.5A-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5A-M3/61, 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 SMAJ7.5A-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ7.5A-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ7.5A-M3/61 Tags
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