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Vishay General Semiconductor - Diodes Division SMA5J40AHM3/I
- Part No.:
- SMA5J40AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J40AHM3/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,565
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Product details
Overview
SMA5J40AHM3/I 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 range (VBR), 64.5 V clamping voltage at 7.8 A peak pulse current (IPPM), 500 W peak pulse power (10/1000 µs), and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMA5J40AHM3/I datasheet, SMA5J40AHM3/I pinout, SMA5J40AHM3/I application, or SMA5J40AHM3/I equivalent, this page delivers verified electrical parameters, thermal resistance (RθJA = 80 °C/W), polarity marking (cathode band), and design-critical distinctions between unidirectional and bidirectional variants - essential for ESD/surge protection layout and reliability validation.
Technical Context
This TVS diode operates as a clamping device that transitions from high-impedance to low-impedance state during overvoltage events, limiting transient energy to protected downstream circuitry. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1 ns), while the SMA package supports automated placement and meets J-STD-020 MSL level 1 (260 °C reflow).
The SMA5J40AHM3/I is rated for non-repetitive 10/1000 µs surges up to 500 W and 8.3 ms half-sine forward surge current of 40 A (IFSM). Its thermal resistance (RθJL = 25 °C/W) enables effective heat dissipation when mounted on 5.0 mm × 5.0 mm copper pads, supporting operation across -55 °C to +150 °C junction temperature range.
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 36–40 V systems. |
| VBR (min/max) | 44.4 V / 49.1 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on threshold under surge conditions. |
| VC @ IPPM | 64.5 V - Clamped voltage at 7.8 A peak pulse current; determines maximum stress imposed on protected ICs or MOSFETs. |
| PPPM | 500 W - Peak pulse power handling (10/1000 µs waveform); defines single-event surge energy absorption capability. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); critical for inductive load switching protection. |
| TJ max. | +150 °C - Maximum junction temperature; sets thermal derating limits for sustained operation in enclosed automotive environments. |
| RθJA | 80 °C/W - Junction-to-ambient thermal resistance (on standard pad layout); used to calculate temperature rise under steady-state leakage or repeated pulses. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, with matte tin-plated leads solderable per J-STD-002. Cathode indicated by a band on the case end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal (unidirectional) | Connected to ground or lower-potential node; conducts during positive transients when cathode is biased above anode. |
| Cathode | Reverse-biased terminal (marked with band) | Connected to protected line (e.g., 40 V rail); enters avalanche breakdown when voltage exceeds VBR, shunting surge to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - required for engine control, ADAS, and infotainment modules. |
| Low incremental surge resistance | Enables tighter clamping (VC − VBR ≈ 15.4 V) and reduced let-through energy versus higher-Rsurge TVS devices. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard 260 °C reflow without baking - simplifies SMT manufacturing and reduces process risk. |
| Glass-passivated junction | Provides stable leakage current (<1.0 µA at VWM) and long-term parameter consistency across temperature and aging. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 36–40 V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between supply rail and chassis ground. Use Value: Limits peak voltage to ≤64.5 V during 500 W surges, preventing damage to 42 V-rated microcontrollers and CAN transceivers. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in factory automation PLCs exposed to relay coil kickback. IC Role / Device Role / Timing Role: Point-of-entry TVS on 24 V sensor supply line, upstream of LDO and ADC front-end. Use Value: Sub-1 ns response clamps 1 kV/µs transients before they couple into precision signal conditioning stages. |
| Telecom DC Power Input Protection | Consumer Device USB-C PD Line Protection |
Use Scenario: Securing 48 V PoE++ (IEEE 802.3bt) input stages in network switches and access points. IC Role / Device Role / Timing Role: Primary surge clamp on DC input before primary DC/DC converter. Use Value: Withstands repetitive 10/1000 µs surges up to 500 W while maintaining <1 µA leakage at 40 V - preserving standby efficiency. |
Use Scenario: Protecting USB-C power delivery (PD) controller and port multiplexer from ESD and hot-swap transients. IC Role / Device Role / Timing Role: Unidirectional TVS on VBUS line (40 V max), referenced to system ground. Use Value: Halogen-free HM3 suffix ensures compliance with IEC 61200-4-11 and RoHS, critical for global consumer product certifications. |
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/I | Same electrical specs and package, but RoHS-compliant commercial grade (not AEC-Q101 qualified); no halogen-free assurance. | Lacks automotive qualification - suitable only for industrial/commercial designs where AEC-Q101 is not mandated. | Select SMA5J40AHE3/I if cost sensitivity outweighs automotive reliability requirements and halogen-free materials are not required. |
| SMA6J40A-M3/5A | Higher 600 W PPPM rating, same VWM/VBR, but larger SMA package variant with different thermal resistance (RθJA = 70 °C/W). | Supports higher single-event surge energy; requires revised PCB pad layout due to differing leadframe geometry. | Choose SMA6J40A-M3/5A when system-level testing reveals marginal margin with 500 W clamping, and board space allows larger footprint. |
Compared with SMA5J40AHM3/I, SMA5J40AHE3/I trades AEC-Q101 and halogen-free compliance for lower cost, while SMA6J40A-M3/5A increases surge robustness at the expense of thermal performance and layout compatibility - making SMA5J40AHM3/I the optimal balance for space-constrained, automotive-qualified 40 V rail protection.
Availability
SMA5J40AHM3/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom power input circuits requiring stable component supply, AEC-Q101 traceability, and halogen-free material compliance.
Supply support for SMA5J40AHM3/I 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, MOSFETs, and optoelectronics with emphasis on reliability, power density, and automotive qualification.
The SMA5J series was engineered specifically for high-power-density transient suppression in space-constrained automotive and industrial applications, combining AEC-Q101 validation with industry-standard DO-214AC packaging and precise clamping performance.
FAQ
What is the clamping voltage of the SMA5J40AHM3/I at its rated peak pulse current?
The SMA5J40AHM3/I has a maximum clamping voltage (VC) of 64.5 V at its specified peak pulse current (IPPM) of 7.8 A, measured using the standardized 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is confirmed in the Vishay Electrical Characteristics table for the SMA5J40A device. The SMA5J40AHM3/I inherits identical clamping behavior as the base SMA5J40A variant.
Is the SMA5J40AHM3/I suitable for automotive applications?
Yes, the SMA5J40AHM3/I is AEC-Q101 qualified and explicitly designated for automotive use, as indicated by the "HM3" suffix (halogen-free, RoHS-compliant, AEC-Q101 qualified). It meets rigorous stress tests including temperature cycling, humidity bias, and mechanical shock, making it appropriate for engine control units, body electronics, and ADAS subsystems where reliability under harsh environmental conditions is mandatory. The SMA5J40AHM3/I data sheet confirms this qualification in the Mechanical Data section.
How does the HM3 suffix differ from the HE3 suffix in the SMA5J40A family?
The HM3 suffix denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction, whereas the HE3 suffix indicates RoHS-compliant and AEC-Q101 qualified but not halogen-free. Both share identical electrical specifications and package dimensions, but HM3 satisfies stricter environmental mandates such as IEC 61200-4-11 and certain OEM chemical content restrictions. The SMA5J40AHM3/I therefore provides full regulatory alignment where halogen-free materials are contractually required.
What is the thermal resistance of the SMA5J40AHM3/I, and how does it affect layout design?
The SMA5J40AHM3/I 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 directly impacts PCB copper area allocation: reducing pad size or omitting thermal vias increases RθJA, risking junction overheating during repeated surges. Layout must follow Vishay's recommended mounting pad dimensions to ensure reliable operation within the -55 °C to +150 °C junction temperature range.
Does the SMA5J40AHM3/I have polarity marking, and how is it identified?
Yes, the SMA5J40AHM3/I is unidirectional and features a visible cathode band on the case end, consistent with DO-214AC package conventions. This band must be oriented toward the higher-potential side of the protected line (e.g., connected to a 40 V rail), while the anode connects to ground or lower potential. Incorrect orientation prevents proper clamping action and may result in catastrophic failure during overvoltage events. Polarity identification is documented in the Mechanical Data section of the Vishay datasheet.
SMA5J40AHM3/I 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/I FAQ
1.How can I place an order for SMA5J40AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J40AHM3/I 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/I reliable?
The price and inventory of SMA5J40AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J40AHM3/I is usually 5 days.
3.What payment methods are accepted for SMA5J40AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J40AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J40AHM3/I?
SMA5J40AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J40AHM3/I 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/I?
For technical support, including SMA5J40AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J40AHM3/I requirements.
6.How does Aetrix verify that SMA5J40AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMA5J40AHM3/I 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/I meets industry standards.
7.What is the process for return or replacement of SMA5J40AHM3/I?
All SMA5J40AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J40AHM3/I, 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/I part is unused and in its original packaging.
Return procedure for SMA5J40AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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