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Vishay General Semiconductor - Diodes Division SMAJ30A-M3/5A
- Part No.:
- SMAJ30A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30A-M3/5A.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ30A-M3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 30 V standoff 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 - deployed in automotive ECUs, industrial sensor interfaces, and 24 V supply inputs.
For engineers reviewing the SMAJ30A-M3/5A datasheet, SMAJ30A-M3/5A pinout, SMAJ30A-M3/5A application, or SMAJ30A-M3/5A equivalent, key selection criteria include unidirectional polarity, SMA (DO-214AC) package compatibility, 1.0 μA max reverse leakage at VWM, -55 °C to +150 °C operating junction temperature, and halogen-free RoHS compliance per M3 suffix.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below VWM = 30 V and rapidly transitions to low-impedance conduction above VBR = 33.3 V, limiting transient-induced overvoltage to ≤48.4 V at 8.3 A. Its glass-passivated junction ensures stable avalanche characteristics and fast response time (<1 ns).
Thermal performance is defined by RθJA = 120 °C/W (on standard 0.2" × 0.2" copper pads) and RθJL = 30 °C/W, supporting reliable operation up to TJ = 150 °C. The device meets J-STD-020 MSL Level 1 and is rated for 40 A non-repetitive forward surge current (8.3 ms half-sine).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse working voltage before clamping initiates; sets upper limit for normal circuit operation. |
| VBR (min/max) | 33.3 V / 36.8 V at IT = 1 mA - Confirmed breakdown range defining turn-on threshold under standardized test conditions. |
| VC @ IPPM | 48.4 V at 8.3 A - Clamped voltage during 10/1000 μs transient; determines worst-case overvoltage seen by protected ICs. |
| PPPM | 400 W - Peak pulse power handling capability; defines energy absorption capacity for common lightning/inductive-spike waveforms. |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms); validates survivability against motor-switching or relay-coil transients. |
| TJ Range | -55 °C to +150 °C - Full operational junction temperature range; supports under-hood automotive and industrial ambient environments. |
| Leakage @ VWM | ≤1.0 μA - Low reverse leakage ensures minimal power loss and signal integrity degradation in standby or low-power modes. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to lower-potential side of protected line; enables conduction when cathode voltage exceeds anode by ≥VBR. |
| Cathode | Reverse-biased terminal (marked with band) | Connected to higher-potential rail (e.g., VCC); defines polarity-sensitive clamping direction for DC systems. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 24 V bus without derating above 78 V. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving margin for 3.3 V/5 V logic-level interface ICs. |
| MSL Level 1, 260 °C reflow compatible | Supports single-pass lead-free reflow assembly without preconditioning or special handling requirements. |
| Halogen-free, RoHS-compliant (M3 suffix) | Fulfills environmental compliance mandates for automotive Tier-1 suppliers and EU industrial equipment OEMs. |
| AEC-Q101 qualification option | Available in HM3 variant for automotive applications requiring validated reliability under temperature cycling and HTRB stress. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
|
Use Scenario: Protects microcontroller GPIOs and CAN transceiver power pins from load-dump and jump-start transients in 12 V/24 V vehicle networks. IC Role / Device Role: Unidirectional clamping TVS placed between VBAT and ground, shunting surge energy away from downstream regulators and interface ICs. Use Value: Limits clamped voltage to 48.4 V, maintaining safe margin below 60 V absolute maximum ratings of common automotive PMICs and CAN FD transceivers. |
Use Scenario: Shields 24 V digital input optocoupler circuits from inductive kickback generated by solenoid/valve switching in factory automation. IC Role / Device Role: Standoff-rated TVS mounted across input terminals to clamp reverse-polarity connection errors and relay coil flyback spikes. Use Value: With 1.0 μA leakage at 30 V, it avoids false triggering in high-impedance current-sense input stages while surviving 40 A surge events. |
| Telecom Power Supply Front-End | Consumer Appliance Motor Driver Board |
|
Use Scenario: Guards AC/DC adapter output rails against lightning-induced surges entering via PoE or external DC input connectors. IC Role / Device Role: Primary-stage TVS on secondary-side 24 V output, coordinated with upstream MOVs and fuses for staged protection. Use Value: 400 W rating and 48.4 V clamping enable coordination with 36 V-rated DC-DC converters without overvoltage failure. |
Use Scenario: Safeguards gate drivers and MCU power pins from back-EMF transients during brushed DC motor commutation in washing machines or HVAC blowers. IC Role / Device Role: Localized TVS on motor driver VDD rail, placed adjacent to LDOs to prevent latch-up during 100 V+ flyback events. Use Value: Fast <1 ns response and low thermal resistance (RθJL = 30 °C/W) ensure reliable clamping without thermal runaway during repetitive motor starts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30A-E3/5A | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs M3). | Acceptable for commercial/industrial use where halogen-free requirement is not mandated. | Select E3 for cost-sensitive non-automotive designs; M3 required for automotive or green procurement policies. |
| SMAJ33A-M3/5A | Higher VWM = 33 V, VBR = 36.7–40.6 V, VC = 53.3 V - trades tighter clamping margin for increased immunity to normal-mode ripple. | Better suited for 36 V nominal systems with higher tolerance for clamping voltage. | Choose SMAJ33A-M3/5A if system VIN has >±10 % variation and 48.4 V clamping is too tight for downstream IC margins. |
Compared with SMAJ30A-M3/5A, the E3 variant offers identical protection performance without halogen-free certification, while SMAJ33A-M3/5A provides higher standoff and clamping voltages - enabling design flexibility for 33–36 V rails where reduced false-trigger risk outweighs clamping voltage penalty.
Availability
SMAJ30A-M3/5A is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and telecom power supply front-ends requiring stable component supply, halogen-free compliance, and AEC-Q101-qualified alternatives.
Supply support for SMAJ30A-M3/5A 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, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMAJ series targets board-level transient suppression in harsh environments, delivering standardized 400 W surge capability in compact SMA packages for cost-effective, high-volume ESD and surge protection across transportation, industrial, and communications infrastructure.
FAQ
What is the clamping voltage of SMAJ30A-M3/5A under a 10/1000 μs surge?
The SMAJ30A-M3/5A exhibits a maximum clamping voltage (VC) of 48.4 V when subjected to its rated peak pulse current of 8.3 A using the standardized 10/1000 μs waveform. This value is measured per JEDEC standards and reflects worst-case overvoltage seen by protected circuitry during transient events - critical for ensuring downstream ICs remain within their absolute maximum voltage ratings. The SMAJ30A-M3/5A maintains this clamping performance across its full operating temperature range.
Does SMAJ30A-M3/5A meet automotive qualification standards?
The SMAJ30A-M3/5A itself is commercial-grade and halogen-free RoHS-compliant (M3 suffix), but not AEC-Q101 qualified. However, Vishay offers the functionally identical SMAJ30AHM3_X variant (where "_X" denotes revision code) which carries full AEC-Q101 qualification for automotive applications. Engineers specifying SMAJ30A-M3/5A for automotive use should verify whether HM3 ordering code and appropriate revision suffix are required for compliance - the SMAJ30A-M3/5A datasheet explicitly references AEC-Q101 availability for HE3/HM3 variants.
How does the M3 suffix differ from E3 in SMAJ30A-M3/5A?
The M3 suffix in SMAJ30A-M3/5A indicates halogen-free, RoHS-compliant construction meeting IEC 61249-2-21 requirements, whereas E3 denotes RoHS-compliant but standard brominated flame-retardant molding compound. Both share identical electrical parameters, thermal characteristics, and mechanical dimensions. The SMAJ30A-M3/5A is selected when environmental regulations or customer specifications mandate halogen-free materials - common in automotive Tier-1 supply chains and EU industrial equipment.
What is the maximum reverse leakage current for SMAJ30A-M3/5A at its standoff voltage?
The SMAJ30A-M3/5A specifies a maximum reverse leakage current (ID) of 1.0 μA at its rated standoff voltage (VWM) of 30 V and ambient temperature of 25 °C. This low leakage ensures minimal power loss in always-on systems and prevents false triggering in high-impedance sensing circuits. Leakage remains well below 10 μA across the full -55 °C to +125 °C operating range, preserving signal integrity in battery-powered and precision analog applications using SMAJ30A-M3/5A.
Can SMAJ30A-M3/5A be used in bidirectional protection circuits?
No - SMAJ30A-M3/5A is strictly unidirectional, as indicated by the "A" suffix and cathode band marking. For bidirectional transient suppression, Vishay specifies the SMAJ30CA variant (with "CA" suffix), which provides symmetrical clamping in both polarities and no polarity marking. Using SMAJ30A-M3/5A in AC or floating signal-line applications would result in forward conduction during negative half-cycles, potentially damaging the device or circuit. Always match the "A" (unidirectional) or "CA" (bidirectional) suffix to the application's voltage polarity requirements.
SMAJ30A-M3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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-M3/5A FAQ
1.How can I place an order for SMAJ30A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30A-M3/5A 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 SMAJ30A-M3/5A reliable?
The price and inventory of SMAJ30A-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ30A-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ30A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30A-M3/5A?
SMAJ30A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30A-M3/5A 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 SMAJ30A-M3/5A?
For technical support, including SMAJ30A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30A-M3/5A requirements.
6.How does Aetrix verify that SMAJ30A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ30A-M3/5A 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 SMAJ30A-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ30A-M3/5A?
All SMAJ30A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30A-M3/5A, 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 SMAJ30A-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ30A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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