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Vishay General Semiconductor - Diodes Division SMA5J40AHM3/H
- Part No.:
- SMA5J40AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J40AHM3/H.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,016
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Product details
Overview
SMA5J40AHM3/H 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 a 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.
For engineers reviewing the SMA5J40AHM3/H datasheet, SMA5J40AHM3/H pinout, SMA5J40AHM3/H application, or SMA5J40AHM3/H equivalent, key selection criteria include clamping performance under automotive load-dump transients, thermal resistance (RθJA = 80 °C/W), AEC-Q101 qualification status, and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, optimized for fast response to ESD and lightning-induced surges. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and low incremental surge resistance, enabling precise voltage limiting during transient events.
The device is rated for junction temperatures from –55 °C to +150 °C and supports automated SMT placement per J-STD-002 solderability standards. Its MSL Level 1 rating (260 °C peak reflow) and halogen-free molding compound meet stringent automotive and industrial reliability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 44.4 V / 49.1 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold |
| VC @ IPPM | 64.5 V - Clamped voltage seen by protected circuit when subjected to 7.8 A 10/1000 µs surge |
| PPPM | 500 W - Peak transient energy absorption capability under standardized surge waveform |
| RθJA | 80 °C/W - Thermal resistance from junction to ambient, critical for power derating above 25 °C |
| TJ max | +150 °C - Maximum allowable junction temperature, supporting operation in under-hood automotive environments |
| Polarity | Unidirectional - Cathode band denotes terminal requiring negative bias for conduction |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads; meets UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line; conducts during forward surge or bias |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to higher-potential rail; initiates avalanche breakdown when reverse voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Halogen-free, RoHS-compliant construction | HM3 suffix confirms full compliance with environmental regulations and automotive material restrictions |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ratio ≈ 1.45), minimizing overvoltage stress on downstream ICs |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking, simplifying SMT manufacturing |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against ISO 7637-2 load dump transients up to 60 V. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp surges before they reach PMICs or microcontrollers. Use Value: With 64.5 V clamping at 7.8 A and 500 W rating, SMA5J40AHM3/H limits overvoltage exposure while surviving repeated transients per AEC-Q101 stress profiles. | Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) connected to ADC inputs in factory automation systems. IC Role / Device Role / Timing Role: Low-capacitance TVS on signal lines to suppress ESD (IEC 61000-4-2) and inductive switching noise without distorting millivolt-level signals. Use Value: Sub-1 µA leakage at 40 V and fast avalanche response ensure minimal signal loading and reliable transient suppression below 1 ns rise time. |
| Telecom DC Power Input Protection | Consumer Device USB Port Protection |
Use Scenario: Guarding 48 V PoE-powered equipment inputs against lightning-induced surges on outdoor Ethernet links. IC Role / Device Role / Timing Role: Primary surge arrestor on DC input stage, coordinated with upstream GDTs or MOVs for staged protection. Use Value: 500 W PPPM and 80 °C/W RθJA allow sustained surge handling in enclosed telecom enclosures with limited airflow. | Use Scenario: Adding secondary-level surge immunity to USB VBUS lines in portable speakers or smart home hubs. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after primary fuse to prevent latch-up or damage during hot-plug or cable discharge events. Use Value: 40 V VWM matches USB 2.0/3.0 VBUS tolerance, while unidirectional polarity prevents interference with host/device enumeration logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J40AHE3/H | RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification | Suitable for commercial-grade industrial or consumer designs where automotive qualification is unnecessary | Select when cost sensitivity outweighs halogen-free or automotive requirements |
| SMA6J40A-M3/H | 600 W PPPM rating, higher IPPM (8.5 A), same VWM/VBR/VC specs, identical package | Better suited for systems expecting more severe or frequent surges, such as heavy-duty motor controls | Choose when design margin requires >500 W surge capacity without changing PCB layout |
Compared with SMA5J40AHM3/H, SMA5J40AHE3/H omits halogen-free and AEC-Q101 compliance but retains identical electrical specs, while SMA6J40A-M3/H increases surge robustness by 20 % without altering footprint or clamping behavior-enabling drop-in upgrades where thermal headroom allows.
Availability
SMA5J40AHM3/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, telecom power inputs, and consumer USB port protection requiring stable component supply across extended production lifecycles.
Supply support for SMA5J40AHM3/H 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 SMA5J series is engineered for high-power-density transient suppression in space-constrained SMT applications, targeting automotive, industrial, and communications systems where AEC-Q101 qualification and halogen-free compliance are mandatory.
FAQ
What is the clamping voltage of the SMA5J40AHM3/H under a 10/1000 µs surge?
The SMA5J40AHM3/H exhibits a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak pulse current of 7.8 A using the standardized 10/1000 µs waveform. This value is measured at the device terminals under specified test conditions (TA = 25 °C, mounted on 5.0 mm × 5.0 mm copper pads), and defines the upper voltage limit imposed on protected circuits during surge events. The SMA5J40AHM3/H maintains this clamping performance consistently across its qualified operating temperature range.
Is the SMA5J40AHM3/H qualified for automotive applications?
Yes, the SMA5J40AHM3/H is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's official datasheet (Document Number: 88875, Revision: 09-Jan-2024). This qualification covers stress tests including temperature cycling, high-temperature operating life, and mechanical shock-validating its suitability for under-hood and chassis-mounted automotive electronics. The SMA5J40AHM3/H also meets JESD 201 Class 2 whisker resistance and MSL Level 1 reflow requirements.
What does the "HM3" suffix indicate for the SMA5J40AHM3/H?
The "HM3" suffix in SMA5J40AHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Specifically, "H" identifies the AEC-Q101 grade, "M3" confirms halogen-free and RoHS compliance, and the trailing "/H" indicates tape-and-reel packaging in 7-inch reels (1800 units per reel). This suffix differentiates it from commercial-grade variants like SMA5J40A-E3/H and ensures compliance with automotive material restrictions and environmental directives.
How does the thermal resistance of the SMA5J40AHM3/H affect its surge handling capability?
The SMA5J40AHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W, meaning each watt of dissipated surge energy raises the junction temperature by 80 °C above ambient. At elevated board temperatures, this necessitates derating of its 500 W peak pulse power rating per Figure 2 in the datasheet. For example, at TA = 85 °C, the usable PPPM drops to approximately 320 W-making thermal pad design and airflow critical for sustained surge performance in enclosed automotive or industrial enclosures.
Can the SMA5J40AHM3/H be used in bidirectional configurations?
No, the SMA5J40AHM3/H is strictly a unidirectional TVS diode, as indicated by its "A" suffix and cathode-band marking. Bidirectional operation requires the "CA" suffix (e.g., SMA5J40CA), which provides symmetrical clamping in both polarities. Using SMA5J40AHM3/H in reverse-biased configurations beyond its specified VWM will result in uncontrolled conduction and potential failure. Always verify polarity alignment during PCB layout to ensure the banded cathode connects to the higher-potential node.
SMA5J40AHM3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA5J40AHM3/H FAQ
1.How can I place an order for SMA5J40AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J40AHM3/H 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 SMA5J40AHM3/H reliable?
The price and inventory of SMA5J40AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J40AHM3/H is usually 5 days.
3.What payment methods are accepted for SMA5J40AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J40AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J40AHM3/H?
SMA5J40AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J40AHM3/H 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 SMA5J40AHM3/H?
For technical support, including SMA5J40AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J40AHM3/H requirements.
6.How does Aetrix verify that SMA5J40AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMA5J40AHM3/H 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 SMA5J40AHM3/H meets industry standards.
7.What is the process for return or replacement of SMA5J40AHM3/H?
All SMA5J40AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J40AHM3/H, 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 SMA5J40AHM3/H part is unused and in its original packaging.
Return procedure for SMA5J40AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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