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Vishay General Semiconductor - Diodes Division SMAJ30A-M3/61
- Part No.:
- SMAJ30A-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30A-M3/61.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ30A-M3/61 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping fast voltage transients on power and signal lines. It features a 30 V stand-off voltage (VWM), 33.3–36.8 V breakdown voltage (VBR) at 1 mA, 48.4 V maximum clamping voltage (VC) at 8.3 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial and automotive electronics.
For engineers reviewing the SMAJ30A-M3/61 datasheet, SMAJ30A-M3/61 pinout, SMAJ30A-M3/61 application, or SMAJ30A-M3/61 equivalent, key selection criteria include unidirectional polarity, 30 V working voltage compatibility, 48.4 V clamping performance under 8.3 A surge, halogen-free RoHS compliance (M3 suffix), and AEC-Q101 qualification readiness via HM3 variant.
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 (<1 μA at VWM) and low incremental surge resistance, enabling precise overvoltage limiting during ESD or inductive switching events.
The SMAJ30A-M3/61 delivers 400 W peak pulse power (derated to 300 W above 78 V), supports 40 A non-repetitive forward surge current (8.3 ms half-sine), and maintains operation across –55 °C to +150 °C junction temperature range - validated for use on standard 0.2" × 0.2" copper pads per JEDEC test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC signal line operating margin. |
| VBR (min/max) | 33.3 V / 36.8 V at 1 mA - Confirmed breakdown range ensures reliable turn-on without premature conduction during normal operation. |
| VC @ IPPM | 48.4 V at 8.3 A - Clamping voltage limits downstream component stress during 10/1000 μs transients; critical for IC-level protection. |
| PPPM | 400 W - Peak pulse power handling capability with 10/1000 μs waveform; sufficient for automotive load-dump and inductive kick suppression. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports robustness against high-energy single-event faults. |
| TJ max. | +150 °C - Maximum junction temperature enables deployment in under-hood automotive and high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Surface-mount outline with 0.208" × 0.157" footprint; compatible with automated placement and reflow soldering per J-STD-020 MSL level 1. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional mode) | Connected to lower-potential side of protected line; enables conduction only when cathode is >30 V above anode. |
| Cathode | Reverse-biased terminal (marked with band) | Connected to higher-potential side (e.g., VCC, signal line); initiates clamping when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables suppression of high-energy transients such as ISO 7637-2 Pulse 5a (load dump) without thermal runaway. |
| Glass passivated chip junction | Ensures stable VBR tolerance (±5 % typical), low leakage (<1 μA), and long-term reliability under thermal cycling. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for automotive and industrial OEMs without compromising surge robustness. |
| MSL level 1 (JEDEC J-STD-020) | Allows unlimited floor life and standard reflow profiles up to 260 °C peak, simplifying SMT manufacturing integration. |
| AEC-Q101 qualification path (HM3 variant) | Supports automotive-grade validation with identical electrical specs - enables drop-in upgrade for qualified designs. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V power rails in body control modules from load-dump transients (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery input and DC/DC converter input stage. Use Value: Limits transient voltage to ≤48.4 V, preventing damage to 40 V-rated input capacitors and regulator ICs. |
Use Scenario: Shielding analog output lines of pressure sensors in factory automation PLCs from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF) clamping diode mounted directly at connector interface. Use Value: Responds in <1 ps to clamp 8 kV contact ESD (IEC 61000-4-2) while preserving signal integrity below 1 MHz bandwidth. |
| Consumer Power Adapter Input Stage | MOSFET Gate Driver Protection |
|
Use Scenario: Safeguarding AC-DC adapter primary-side rectifier outputs against surges induced by mains switching transients. IC Role / Device Role / Timing Role: Standoff-rated TVS placed across bulk capacitor to absorb repetitive line spikes. Use Value: Withstands 300–400 W pulses at 0.01 % duty cycle, extending capacitor lifetime and reducing field failure rates. |
Use Scenario: Preventing gate oxide rupture in high-side N-channel MOSFETs driven by microcontrollers in motor control H-bridges. IC Role / Device Role / Timing Role: Fast-response TVS connected between gate and source to shunt Miller-induced voltage spikes. Use Value: Clamps gate-source voltage to <48.4 V within nanoseconds, avoiding unintended turn-on and shoot-through failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30A-E3/61 | Same electrical specs; RoHS-compliant but contains brominated flame retardants (non-halogen-free). | Approved for commercial-grade industrial equipment where halogen-free requirement is not mandated. | Select when cost sensitivity outweighs halogen-free compliance; identical layout and thermal behavior. |
| SMAJ30AHM3/61 | Identical VWM, VBR, VC, and PPPM; adds full AEC-Q101 qualification and enhanced traceability. | Required for automotive ECUs, ADAS modules, and any application requiring certified reliability per ISO/TS 16949. | Choose for automotive production programs needing PPAP documentation and extended temperature validation. |
Compared with SMAJ30A-E3/61, the SMAJ30A-M3/61 provides halogen-free compliance without sacrificing surge capability; versus SMAJ30AHM3/61, it offers identical protection performance at lower qualification cost - making it optimal for industrial and Tier-2 automotive designs where AEC-Q101 is not mandatory.
Availability
SMAJ30A-M3/61 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, consumer power adapter surge suppression, and MOSFET gate driver safeguarding requiring stable component supply across multi-year production cycles.
Supply support for SMAJ30A-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 optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was engineered for high-reliability transient suppression in space-constrained surface-mount applications - targeting automotive, industrial, and computing systems where fast response, repeatable clamping, and robust surge handling are essential.
FAQ
What is the clamping voltage of the SMAJ30A-M3/61 under a 10/1000 μs surge?
The SMAJ30A-M3/61 exhibits a maximum clamping voltage (VC) of 48.4 V when subjected to an 8.3 A peak pulse current with a 10/1000 μs waveform. This value is measured per JEDEC standards using 0.2" × 0.2" copper pads and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs rated for ≤50 V operation remain within safe margins. The SMAJ30A-M3/61 achieves this with low incremental resistance and sub-nanosecond response.
Is the SMAJ30A-M3/61 halogen-free and RoHS-compliant?
Yes, the SMAJ30A-M3/61 carries the M3 suffix, indicating it is both RoHS-compliant and halogen-free per IEC 61249-2-21. The molding compound meets UL 94 V-0 flammability rating, and terminals are matte tin plated per J-STD-002. This makes the SMAJ30A-M3/61 suitable for environmentally regulated markets including EU automotive and industrial equipment where brominated flame retardants are prohibited. No requalification is needed when migrating from E3 to M3 variants.
Does the SMAJ30A-M3/61 have AEC-Q101 qualification?
The SMAJ30A-M3/61 itself is not AEC-Q101 qualified; however, the functionally identical SMAJ30AHM3/61 variant carries full AEC-Q101 qualification including temperature cycling, humidity testing, and mechanical shock validation. The SMAJ30A-M3/61 shares identical electrical parameters, package dimensions, and thermal characteristics - enabling straightforward design migration to HM3 for automotive production. Vishay documents this as a direct qualification upgrade path in datasheet revision notes.
What is the maximum operating temperature for the SMAJ30A-M3/61?
The SMAJ30A-M3/61 has a specified junction temperature range of –55 °C to +150 °C, with derating applied above 25 °C ambient per Figure 2 in the Vishay datasheet. At 100 °C ambient, its peak pulse power capability remains ≥250 W for 10/1000 μs transients. This wide thermal envelope allows deployment in engine bay modules, industrial drives, and enclosed power supplies where sustained high-temperature operation is required - confirmed by RθJA = 120 °C/W and RθJL = 30 °C/W thermal resistance values.
How does the SMAJ30A-M3/61 compare to bidirectional variants like SMAJ30CA?
The SMAJ30A-M3/61 is unidirectional and features a cathode band marking; SMAJ30CA is bidirectional with no polarity marking and symmetrical clamping in both directions. While both share identical VWM (30 V), VBR, and VC ratings, the SMAJ30A-M3/61 is intended for DC-biased lines (e.g., VCC to GND), whereas SMAJ30CA suits AC-coupled or floating signal paths. Layout differs: SMAJ30A-M3/61 requires correct orientation, while SMAJ30CA eliminates polarity concerns - but adds ~10 % capacitance due to dual-junction structure.
SMAJ30A-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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 8.3A
- 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)
SMAJ30A-M3/61 FAQ
1.How can I place an order for SMAJ30A-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30A-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 SMAJ30A-M3/61 reliable?
The price and inventory of SMAJ30A-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 SMAJ30A-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ30A-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30A-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30A-M3/61?
SMAJ30A-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30A-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 SMAJ30A-M3/61?
For technical support, including SMAJ30A-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30A-M3/61 requirements.
6.How does Aetrix verify that SMAJ30A-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ30A-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 SMAJ30A-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ30A-M3/61?
All SMAJ30A-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30A-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 SMAJ30A-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ30A-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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