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Vishay General Semiconductor - Diodes Division SMA5J40AHM3_A/I
- Part No.:
- SMA5J40AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J40AHM3_A/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,127
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Product details
Overview
SMA5J40AHM3_A/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 power and signal lines. It features 40 V stand-off voltage (VWM), 44.4–49.1 V breakdown voltage (VBR), 64.5 V clamping voltage at 7.8 A peak pulse current, and 500 W peak pulse power rating with 10/1000 µs waveform. It is halogen-free, RoHS-compliant, AEC-Q101 qualified, and used to protect MOSFETs, ICs, and sensor interfaces in automotive power systems.
For engineers reviewing the SMA5J40AHM3_A/I datasheet, SMA5J40AHM3_A/I pinout, SMA5J40AHM3_A/I application, or SMA5J40AHM3_A/I equivalent, key selection criteria include clamping performance under 500 W surge, unidirectional polarity with cathode band marking, thermal resistance (RθJA = 80 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR (min 44.4 V), it avalanches to limit transient energy by diverting surge current away from downstream components. Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 µA at VWM).
Designed for single-pulse transients per IEC 61000-4-5 (10/1000 µs), it delivers 7.8 A IPPM with VC = 64.5 V and exhibits low incremental surge resistance for minimal voltage overshoot. Thermal performance is validated up to TJ = 150 °C, with derating above TA = 25 °C per Fig. 2 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working range. |
| VBR (min/max) | 44.4 V / 49.1 V - Breakdown occurs within this range at 1 mA test current; ensures reliable turn-on margin above VWM. |
| VC @ IPPM | 64.5 V at 7.8 A - Clamping voltage during 500 W surge; determines maximum stress imposed on protected circuitry. |
| PPPM | 500 W - Peak pulse power handling with 10/1000 µs waveform; defines single-event surge robustness. |
| RθJA | 80 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" pads; critical for thermal design margin at full power. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads. Polarity indicated by cathode band; unidirectional only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration. |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to protected line (e.g., 40 V rail); avalanche conduction occurs when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22 standards. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets global environmental regulations without compromising surge performance or solderability. |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ratio ≈ 1.45) and reduced overshoot during fast transients. |
| MSL Level 1 (260 °C peak reflow) | Supports lead-free reflow without preconditioning; compatible with standard SMT assembly processes. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs and body control modules against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between power rail and ground to clamp surges before they reach PMICs or microcontrollers. Use Value: Withstands 500 W peak pulse and clamps to ≤64.5 V, preventing damage to 40 V-rated input stages while maintaining AEC-Q101 compliance. |
Use Scenario: Safeguarding analog front-end inputs of pressure, temperature, or position sensors exposed to ESD and inductive switching noise. IC Role / Device Role / Timing Role: Low-capacitance (typ. <50 pF at VWM) TVS mounted directly at connector entry point to suppress fast transients before signal conditioning circuitry. Use Value: Sub-1 µA leakage at 40 V ensures minimal impact on sensor bias networks; fast response time preserves signal integrity. |
| DC-DC Converter Input Stage | Motor Drive Gate Driver Protection |
Use Scenario: Input-side surge suppression for buck/boost converters in ADAS camera modules and infotainment power supplies. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of input capacitors and controller ICs to prevent latch-up or gate oxide failure. Use Value: 80 °C/W RθJA allows sustained operation at elevated ambient temperatures common in enclosed enclosures. |
Use Scenario: Protecting high-side/low-side gate driver ICs from shoot-through-induced voltage spikes during MOSFET switching transitions. IC Role / Device Role / Timing Role: Fast-acting unidirectional TVS across driver supply rails (e.g., VDD-GND) to absorb inductive kickback energy. Use Value: 7.8 A IPPM capability handles repetitive switching surges; glass-passivated junction ensures long-term stability under thermal cycling. |
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_A/I | Same electrical specs, but RoHS-compliant commercial grade (not halogen-free); no AEC-Q101 qualification. | Limited to non-automotive industrial or consumer applications where halogen content and automotive qualification are not required. | Select when cost sensitivity outweighs halogen-free or automotive qualification requirements. |
| SMCJ40A | Same VWM/VBR/VC ratings but in larger SMC (DO-214AB) package; higher RθJA (50 °C/W) and 1500 W PPPM rating. | Better suited for higher-power, lower-density layouts where board space permits larger footprint and enhanced thermal dissipation. | Choose for designs needing >500 W surge margin or improved thermal performance without changing circuit topology. |
Compared with SMA5J40AHM3_A/I, SMA5J40AHE3_A/I lacks halogen-free construction and automotive qualification, while SMCJ40A offers higher power handling in a physically larger package-making SMA5J40AHM3_A/I optimal for space-constrained, AEC-Q101–mandated automotive PCBs requiring halogen-free compliance.
Availability
SMA5J40AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and DC-DC converter designs requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification.
Supply support for SMA5J40AHM3_A/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMA5J series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power-density, surface-mount transient suppression in automotive, industrial, and telecom infrastructure where compact size and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of the SMA5J40AHM3_A/I under maximum rated surge current?
The SMA5J40AHM3_A/I clamps to 64.5 V at its specified peak pulse current (IPPM) of 7.8 A, measured with a 10/1000 µs waveform. This value is guaranteed per the datasheet's Electrical Characteristics table and defines the upper voltage limit imposed on protected circuits during a 500 W transient event. The SMA5J40AHM3_A/I maintains this clamping performance across its qualified operating temperature range.
Is the SMA5J40AHM3_A/I suitable for automotive applications?
Yes, the SMA5J40AHM3_A/I is AEC-Q101 qualified and explicitly designated for automotive use via its HM3 suffix (halogen-free, RoHS-compliant, and AEC-Q101 qualified). It meets stress tests including temperature cycling, high-temperature reverse bias, and ESD per JESD22, making it appropriate for engine control units, body electronics, and ADAS power domains where reliability under harsh conditions is required.
How does the SMA5J40AHM3_A/I differ from the SMA5J40AHE3_A/I?
The SMA5J40AHM3_A/I is halogen-free and AEC-Q101 qualified, whereas the SMA5J40AHE3_A/I is RoHS-compliant but not halogen-free and lacks AEC-Q101 certification. Both share identical electrical parameters (VWM = 40 V, VBR = 44.4–49.1 V, VC = 64.5 V), but only SMA5J40AHM3_A/I satisfies automotive environmental and reliability mandates. The suffix "HM3" confirms halogen-free construction and automotive qualification.
What is the thermal resistance of the SMA5J40AHM3_A/I, and how is it measured?
The SMA5J40AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W, measured when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, per JEDEC standards. This value assumes standard FR-4 PCB layout and defines the temperature rise above ambient at full 500 W pulse dissipation-critical for thermal margin analysis in sealed enclosures or high-ambient environments.
Does the SMA5J40AHM3_A/I have polarity marking, and how is it identified?
Yes, the SMA5J40AHM3_A/I is unidirectional and features a visible cathode band on the SMA (DO-214AC) package body. The banded end corresponds to the cathode terminal and must be connected toward the protected line (e.g., 40 V rail), while the anode connects to ground or lower potential. No marking is present on bidirectional variants, but SMA5J40AHM3_A/I is strictly unidirectional per its "A" suffix and datasheet designation.
SMA5J40AHM3_A/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:
- 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:
- 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_A/I FAQ
1.How can I place an order for SMA5J40AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J40AHM3_A/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_A/I reliable?
The price and inventory of SMA5J40AHM3_A/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_A/I is usually 5 days.
3.What payment methods are accepted for SMA5J40AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J40AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J40AHM3_A/I?
SMA5J40AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J40AHM3_A/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_A/I?
For technical support, including SMA5J40AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J40AHM3_A/I requirements.
6.How does Aetrix verify that SMA5J40AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMA5J40AHM3_A/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_A/I meets industry standards.
7.What is the process for return or replacement of SMA5J40AHM3_A/I?
All SMA5J40AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J40AHM3_A/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_A/I part is unused and in its original packaging.
Return procedure for SMA5J40AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA5J40AHM3_A/I Tags
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