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Vishay General Semiconductor - Diodes Division SMAJ5.0A-M3/5A
- Part No.:
- SMAJ5.0A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ5.0A-M3/5A.pdf
- Description:
- TVS DIODE 5VWM 9.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,820
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Product details
Overview
SMAJ5.0A-M3/5A 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 5.0 V DC power rails and signal lines. It features a 6.40 V minimum breakdown voltage (VBR), 9.2 V maximum clamping voltage (VC) at 43.5 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 automotive and industrial control systems.
For engineers reviewing the SMAJ5.0A-M3/5A datasheet, SMAJ5.0A-M3/5A pinout, SMAJ5.0A-M3/5A application, or SMAJ5.0A-M3/5A equivalent, key selection criteria include its 5.0 V stand-off voltage (VWM), low 0.057 %/°C temperature coefficient of VBR, halogen-free RoHS-compliant construction (M3 suffix), and AEC-Q101 qualification readiness via HM3 variant.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, optimized for fast transient suppression on low-voltage DC buses. Its glass-passivated junction delivers sub-nanosecond response time and low incremental surge resistance, enabling effective protection against ESD, lightning-induced surges, and inductive switching spikes.
Rated for -55 °C to +150 °C operating junction temperature, it uses a thermally efficient SMA package with 30 °C/W junction-to-lead thermal resistance. The 120 °C/W junction-to-ambient rating assumes standard 0.2" × 0.2" copper pads - critical for sustaining 400 W pulse power without thermal runaway under repetitive 0.01 % duty cycle conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 5.0 V - Maximum continuous reverse working voltage before leakage exceeds 800 μA; sets upper limit for safe operation on 5 V supply rails. |
| VBR (min/max) | 6.40 V / 7.07 V at 10 mA - Confirmed breakdown range ensures reliable turn-on above nominal rail while avoiding false triggering during normal operation. |
| VC @ IPPM | 9.2 V at 43.5 A - Clamping voltage limits downstream component stress during worst-case 10/1000 μs surge events. |
| PPPM | 400 W - Peak pulse power handling capability with 10/1000 μs waveform defines transient energy absorption capacity. |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms) supports robustness against inrush and fault currents in power circuits. |
| TJ max | +150 °C - Maximum junction temperature enables use in under-hood automotive and high-temperature industrial environments. |
| Package | SMA (DO-214AC) - Surface-mount outline with 0.208" length, 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, UL 94 V-0 rated compound, cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or lower-potential node in unidirectional configuration; conducts during forward surge events. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 5 V rail); initiates avalanche breakdown when transient exceeds VWM. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables single-device protection against IEC 61000-4-5 Level 3 surges (1 kV/2 Ω) on 5 V interfaces without external series impedance. |
| Low 9.2 V clamping voltage at 43.5 A | Keeps protected ICs within absolute maximum ratings during 10/1000 μs transients - critical for 5 V logic and microcontroller I/O pins. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets automotive and industrial environmental compliance requirements without compromising thermal or electrical performance. |
| 0.057 %/°C VBR tempco | Minimizes drift in clamping threshold across automotive temperature range (-40 °C to +125 °C ambient), ensuring consistent protection margin. |
| AEC-Q101 qualification path (HM3 variant) | Supports drop-in qualification for automotive ECUs when ordered as SMAJ5.0AHM3_A/I, with validated reliability testing per stress test conditions. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
|
Use Scenario: Protects 5 V CAN transceiver power supply and I/O lines from load-dump and jump-start induced transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between 5 V rail and ground, responding within <1 ns to suppress >100 V spikes. Use Value: Prevents latch-up or permanent damage to CAN controller ICs during ISO 7637-2 Pulse 5a (load dump) events up to 60 V. |
Use Scenario: Shields 5 V optocoupler input circuitry on digital input cards from field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected across input terminals, conducting only during overvoltage events exceeding 5 V. Use Value: Maintains functional safety integrity by limiting transient voltage to ≤9.2 V, ensuring optocoupler LED remains within safe forward bias range. |
| Consumer IoT Sensor Hub | Telecom Power Management Unit |
|
Use Scenario: Guards I²C and UART signal lines (3.3 V/5 V tolerant) on environmental sensor nodes against ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) unidirectional TVS placed inline with SDA/SCL traces, grounded at connector end. Use Value: Provides ±15 kV contact / ±20 kV air IEC 61000-4-2 ESD protection without distorting 400 kHz I²C timing waveforms. |
Use Scenario: Safeguards 5 V auxiliary power rail feeding FPGA configuration memory and clock buffers in base station power modules. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side DC output, coordinated with upstream OVP circuitry. Use Value: Limits fault voltage to 9.2 V during 10/1000 μs lightning surges (IEC 61000-4-5), preventing bit corruption in configuration SRAM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ5.0A-E3/5A | 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 footprint and assembly process. |
| SMAJ5.0CA-M3/5A | Bidirectional variant with symmetric 6.40–7.25 V VBR; no polarity marking; same VC (9.2 V) and PPPM (400 W). | Required for AC-coupled or floating signal lines (e.g., RS-485, Ethernet PHY) where polarity reversal may occur. | Choose only if bidirectional clamping is needed; not a drop-in replacement due to polarity and marking differences. |
Compared with SMAJ5.0A-M3/5A, the E3 variant offers identical protection performance at lower material cost but lacks halogen-free certification, while the CA variant provides symmetrical clamping essential for differential or AC signals - neither is pin-compatible without layout review due to polarity and marking distinctions.
Availability
SMAJ5.0A-M3/5A is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and telecom power management systems requiring stable component supply with halogen-free compliance and AEC-Q101 qualification pathway.
Supply support for SMAJ5.0A-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, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ESD, lightning, and inductive switching is mission-critical.
FAQ
What is the maximum clamping voltage of the SMAJ5.0A-M3/5A under specified test conditions?
The SMAJ5.0A-M3/5A has a maximum clamping voltage (VC) of 9.2 V when subjected to its rated peak pulse current of 43.5 A using a 10/1000 μs waveform. This value is measured at TA = 25 °C and confirms the device's ability to limit transient voltage to a safe level for 5 V logic components. The SMAJ5.0A-M3/5A maintains this clamping performance across its full operating temperature range, supported by its low 0.057 %/°C VBR temperature coefficient.
Does the SMAJ5.0A-M3/5A meet automotive qualification standards?
The SMAJ5.0A-M3/5A itself is commercial-grade and halogen-free RoHS-compliant, but it serves as the base for AEC-Q101 qualified variants - specifically SMAJ5.0AHM3_A/I (halogen-free, AEC-Q101) and SMAJ5.0AHE3_A/I (RoHS-compliant, AEC-Q101). These qualified versions share identical electrical characteristics and SMA package dimensions. The SMAJ5.0A-M3/5A can be used in automotive designs pending qualification of the HM3 variant, which undergoes extended reliability testing per AEC-Q101.
How does the SMAJ5.0A-M3/5A differ from bidirectional TVS diodes like SMAJ5.0CA-M3/5A?
The SMAJ5.0A-M3/5A is unidirectional with cathode-band polarity marking and conducts only in reverse breakdown, making it ideal for DC rail protection. In contrast, SMAJ5.0CA-M3/5A is bidirectional with symmetrical breakdown in both directions and no polarity marking - required for AC or floating signal lines. Both share identical VWM (5.0 V), VC (9.2 V), and PPPM (400 W), but the SMAJ5.0A-M3/5A cannot replace the CA version without circuit redesign due to polarity dependency.
What is the thermal resistance profile of the SMAJ5.0A-M3/5A and how does it affect PCB layout?
The SMAJ5.0A-M3/5A has a typical junction-to-lead thermal resistance (RθJL) of 30 °C/W and junction-to-ambient (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This means effective heat dissipation requires adherence to Vishay's recommended pad layout - undersized pads increase RθJA, risking thermal saturation during repetitive surges. For sustained 400 W pulse handling, designers must ensure adequate copper area and avoid thermal isolation of the SMAJ5.0A-M3/5A's leads.
Can the SMAJ5.0A-M3/5A be used to protect 3.3 V circuits?
No - the SMAJ5.0A-M3/5A is not suitable for direct 3.3 V circuit protection because its 5.0 V stand-off voltage (VWM) exceeds typical 3.3 V rail tolerances, risking premature leakage or false triggering. For 3.3 V systems, Vishay recommends SMAJ3.3A variants (VWM = 3.3 V, VBR = 3.67–4.05 V). Using SMAJ5.0A-M3/5A on a 3.3 V rail may cause excessive reverse leakage (>800 μA) and reduce noise margin, compromising system reliability.
SMAJ5.0A-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):
- 5V
- Voltage - Breakdown (Min):
- 6.4V
- Voltage - Clamping (Max) @ Ipp:
- 9.2V
- Current - Peak Pulse (10/1000µs):
- 43.5A
- 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)
SMAJ5.0A-M3/5A FAQ
1.How can I place an order for SMAJ5.0A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ5.0A-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 SMAJ5.0A-M3/5A reliable?
The price and inventory of SMAJ5.0A-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 SMAJ5.0A-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ5.0A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ5.0A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ5.0A-M3/5A?
SMAJ5.0A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ5.0A-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 SMAJ5.0A-M3/5A?
For technical support, including SMAJ5.0A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ5.0A-M3/5A requirements.
6.How does Aetrix verify that SMAJ5.0A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ5.0A-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 SMAJ5.0A-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ5.0A-M3/5A?
All SMAJ5.0A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ5.0A-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 SMAJ5.0A-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ5.0A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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