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Vishay General Semiconductor - Diodes Division SMA5J40A-M3/5A
- Part No.:
- SMA5J40A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J40A-M3/5A.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMA5J40A-M3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on DC power rails and signal lines. It features 40 V stand-off voltage (VWM), 44.4–49.1 V breakdown voltage (VBR), 64.5 V clamping voltage (VC) at 7.8 A peak pulse current, and 500 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMA5J40A-M3/5A datasheet, SMA5J40A-M3/5A pinout, SMA5J40A-M3/5A application, or SMA5J40A-M3/5A equivalent, key selection criteria include clamping performance under 7.8 A surge, thermal resistance (RθJA = 80 °C/W), halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a unidirectional clamping device, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its design targets transient suppression per IEC 61000-4-2 (ESD) and IEC 61000-4-5 (surge), with clamping action triggered when reverse voltage exceeds VBR (min 44.4 V).
The SMA5J40A-M3/5A is rated for TJ = –55 °C to +150 °C operation and supports 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine). Its M3 suffix confirms halogen-free, RoHS-compliant construction and JESD201 Class 2 whisker resistance - critical for automotive and industrial reliability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 48 V systems. |
| VBR (min/max) | 44.4 V / 49.1 V - breakdown threshold range at 1 mA test current; ensures consistent turn-on across production lots. |
| VC @ IPPM | 64.5 V at 7.8 A - clamped voltage during 10/1000 μs surge; limits downstream IC stress to <65 V under worst-case transients. |
| PPPM | 500 W - peak pulse power handling capability; enables robust protection against lightning-induced surges per IEC 61000-4-5 Level 3. |
| RθJA | 80 °C/W - junction-to-ambient thermal resistance on standard 5.0 mm × 5.0 mm pads; informs derating above 25 °C ambient. |
| Polarity | Unidirectional - cathode marked by band; blocks forward conduction until Vf ≈ 3.5 V at 25 A, enabling DC rail protection only. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by molded band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / reverse surge return path | Connected to protected circuit ground or low-side return; carries full surge current during clamping. |
| Cathode | Reverse voltage sensing / clamping node | Connected to protected line (e.g., 48 V rail); voltage rise beyond VBR triggers avalanche conduction to shunt energy. |
Key Features
| Feature | Design Value |
|---|---|
| Low profile SMA package | Enables high-density PCB layouts and compatibility with automated pick-and-place equipment (MSL Level 1, 260 °C reflow). |
| Glass passivated junction | Ensures stable VBR over temperature and long-term reliability in harsh environments (e.g., under-hood automotive). |
| 500 W peak pulse power | Supports IEC 61000-4-5 surge immunity up to 1 kV open-circuit / 0.5 Ω source impedance without failure. |
| Halogen-free, RoHS-compliant (M3) | Fulfills automotive OEM material compliance requirements (e.g., GMW3172, Ford WSS-M99P9999-A1) and end-of-life recycling mandates. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: 48 V battery rail in ADAS camera modules exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between input fuse and DC-DC converter input. Use Value: Limits voltage to ≤64.5 V during 7.8 A surge, preventing damage to 65 V-rated input capacitors and controller ICs. |
Use Scenario: CAN FD or LIN bus lines in factory automation sensors subject to ESD and inductive switching noise. IC Role / Device Role / Timing Role: Point-of-entry transient suppressor on differential pair, referenced to local ground plane. Use Value: Sub-ns response clamps fast transients before they propagate into transceiver ICs, preserving signal integrity at >2 Mbps. |
| Telecom DC Power Feeds | Consumer Device USB-C Power Path |
Use Scenario: 48 V PoE++ (IEEE 802.3bt) powered device front-end subjected to cable discharge events. IC Role / Device Role / Timing Role: Primary overvoltage clamp on PSE-side DC input, upstream of hot-swap controller. Use Value: Withstands 500 W surges while maintaining VWM = 40 V margin, ensuring no false triggering during normal 57 V max PoE operation. |
Use Scenario: USB-C port VBUS line in portable monitors experiencing hot-plug insertion spikes and adapter transients. IC Role / Device Role / Timing Role: Secondary surge limiter after primary fuse, protecting USB PD controller and power switches. Use Value: Clamps 10/1000 μs surges to 64.5 V, staying below absolute maximum ratings of common 60 V-rated eFuses and load switches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J40A-E3/5A | Same electrical specs, but RoHS-compliant without halogen-free certification (E3 vs. M3). | Approved for commercial-grade industrial use; not qualified for halogen-free mandates (e.g., EU Directive 2011/65/EU Annex II updates). | Select E3 for cost-sensitive non-automotive designs where halogen content is unrestricted. |
| SMA5J40CA-M3/5A | Bidirectional variant: symmetric VBR (±44.4 V), no polarity marking, same VWM magnitude (40 V), identical PPPM and VC. | Required for AC-coupled or floating signal lines (e.g., RS-485, audio), where reverse polarity transients occur. | Choose CA version only when bidirectional clamping is mandatory; SMA5J40A-M3/5A is optimal for DC rails with defined polarity. |
Compared with SMA5J40A-E3/5A, the M3 suffix adds halogen-free assurance without performance trade-offs; versus SMA5J40CA-M3/5A, the unidirectional configuration provides tighter DC margin control and eliminates ambiguity in cathode orientation during layout.
Availability
SMA5J40A-M3/5A is available at Aetrix Electronics and suitable for automotive power inputs, industrial sensor interfaces, telecom DC feeds, and consumer USB-C power path designs requiring stable component supply and halogen-free compliance.
Supply support for SMA5J40A-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 density, and AEC-Q qualification.
The SMA5J series is engineered for high-power-density transient suppression in space-constrained, high-reliability applications - particularly automotive, industrial, and telecom infrastructure where 500 W surge handling and MSL Level 1 assembly compatibility are essential.
FAQ
What is the clamping voltage of the SMA5J40A-M3/5A under a standard 10/1000 μs surge?
The SMA5J40A-M3/5A exhibits a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak pulse current of 7.8 A using the 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMA5J40A-M3/5A maintains this clamping performance across its operational temperature range, supporting robust system-level EMC compliance.
Is the SMA5J40A-M3/5A suitable for automotive applications?
Yes, the SMA5J40A-M3/5A meets halogen-free and RoHS-compliance requirements (M3 suffix) and is built on Vishay's AEC-Q101-qualified platform - though the specific SMA5J40A-M3/5A part number is commercial-grade. For production automotive use, the AEC-Q101 variant SMA5J40A-HM3_X should be selected. The SMA5J40A-M3/5A remains appropriate for automotive prototyping, aftermarket modules, and non-safety-critical subsystems where M3 material compliance is required.
How does the SMA5J40A-M3/5A differ from the SMA5J40CA-M3/5A?
The SMA5J40A-M3/5A is unidirectional with cathode marking and conducts only in reverse avalanche mode, while the SMA5J40CA-M3/5A is bidirectional with symmetrical breakdown in both polarities and no polarity marking. Both share identical VWM (40 V), PPPM (500 W), and VC (64.5 V), but the CA version is mandatory for AC or floating signal lines. The SMA5J40A-M3/5A is preferred for DC power rails where polarity is fixed and tighter stand-off margin is advantageous.
What is the thermal resistance of the SMA5J40A-M3/5A, and how does it affect layout?
The SMA5J40A-M3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard FR-4 PCB construction and dictates minimum copper area needed for reliable operation at elevated ambient temperatures. Derating curves in the datasheet require reducing peak pulse power above 25 °C ambient - for example, at 85 °C, usable PPPM drops to ~350 W. Proper pad sizing is essential to maintain the SMA5J40A-M3/5A within its 150 °C max junction temperature limit.
Does the SMA5J40A-M3/5A have a specified junction capacitance?
No, the official Vishay datasheet for SMA5J40A-M3/5A does not specify junction capacitance (CJ). While lower-voltage SMA5J variants (e.g., SMA5J5.0A) list CJ values (e.g., 1200 pF at 0 V), the SMA5J40A-M3/5A datasheet omits this parameter. For high-frequency signal line protection where capacitance matters (e.g., >10 Mbps data lines), designers should consult Vishay's application notes or select a TVS family with published CJ data - the SMA5J40A-M3/5A is optimized for power rail and lower-speed interface protection, not RF or high-speed digital paths.
SMA5J40A-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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 7.8A
- Power - Peak Pulse:
- 500W
- 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)
SMA5J40A-M3/5A FAQ
1.How can I place an order for SMA5J40A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J40A-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 SMA5J40A-M3/5A reliable?
The price and inventory of SMA5J40A-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 SMA5J40A-M3/5A is usually 5 days.
3.What payment methods are accepted for SMA5J40A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J40A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J40A-M3/5A?
SMA5J40A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J40A-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 SMA5J40A-M3/5A?
For technical support, including SMA5J40A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J40A-M3/5A requirements.
6.How does Aetrix verify that SMA5J40A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMA5J40A-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 SMA5J40A-M3/5A meets industry standards.
7.What is the process for return or replacement of SMA5J40A-M3/5A?
All SMA5J40A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J40A-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 SMA5J40A-M3/5A part is unused and in its original packaging.
Return procedure for SMA5J40A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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