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Vishay General Semiconductor - Diodes Division SMA5J40AHE3_A/I
- Part No.:
- SMA5J40AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J40AHE3_A/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,896
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Product details
Overview
SMA5J40AHE3_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 - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMA5J40AHE3_A/I datasheet, SMA5J40AHE3_A/I pinout, SMA5J40AHE3_A/I application, or SMA5J40AHE3_A/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR (44.4–49.1 V), it avalanches to limit transient energy across protected circuitry. Its glass-passivated junction ensures stable leakage (<1.0 μA at 40 V) and fast response time (<1.0 ps typical).
Thermal design relies on RθJA = 80 °C/W and RθJL = 25 °C/W, requiring minimum pad layout per Vishay spec for rated 500 W dissipation. The HE3 suffix confirms RoHS-compliance and AEC-Q101 qualification for automotive-grade reliability under -55 °C to +150 °C operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin for protected line. |
| VBR min/max | 44.4 V / 49.1 V - guaranteed avalanche initiation 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; determines maximum stress imposed on downstream components. |
| PPPM | 500 W - peak pulse power handling capability; enables protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) when properly mounted. |
| TJ max | +150 °C - maximum junction temperature; supports operation in under-hood automotive environments and industrial enclosures. |
| Polarity | Unidirectional - cathode marked with band; blocks forward conduction above ~3.5 V, enabling DC-biased protection schemes. |
| Package | SMA (DO-214AC) - surface-mount outline with 0.208" length, 0.177" width, and 0.090" height; compatible with standard SMT reflow profiles (MSL level 1, 260 °C peak). |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, polarity indicated by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Low-side reference terminal | Connected to ground or low-voltage rail; forms return path during clamping event. |
| Cathode (banded end) | High-side surge input terminal | Connected to protected line (e.g., 40 V supply rail); avalanche conduction occurs from cathode to anode during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS power rails per stress test requirements. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage current under thermal cycling and humidity exposure. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving clamping precision for sensitive 3.3 V or 5 V logic interfaces. |
| MSL level 1 (260 °C) | Enables single-pass lead-free reflow without moisture-induced damage; no baking required prior to assembly. |
| Automated placement compatible | Standard SMA footprint and lead geometry support high-speed pick-and-place with >99.9% placement yield. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 40 V battery-fed ECUs against load dump transients up to 120 V and 100 ms duration. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between VBAT and chassis ground to clamp surges before they reach LDOs and microcontrollers. Use Value: Withstands 500 W pulses and maintains <1.0 μA leakage at 40 V, preserving quiescent current budget in always-on modules. |
Use Scenario: Safeguarding analog front-end inputs of pressure/temperature sensors connected to 24–40 V industrial PLC I/O modules. IC Role / Device Role / Timing Role: Standoff-rated TVS on sensor signal line to suppress ESD (IEC 61000-4-2 ±8 kV) and inductive switching noise from solenoid drivers. Use Value: 64.5 V clamping voltage prevents saturation of 3.3 V ADC inputs while allowing full dynamic range of 0–40 V sensor output. |
| DC-DC Converter Input Protection | Telecom Power Supply Surge Suppression |
Use Scenario: Input-stage protection for 40 V input buck converters in base station power systems exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary surge limiter upstream of input filter capacitor and controller IC, absorbing energy before it reaches switching FETs. Use Value: 7.8 A peak pulse current rating aligns with IEC 61000-4-5 combination wave (2 Ω source) testing at 40 V nominal systems. |
Use Scenario: Secondary-side protection on 48 V telecom rectifier outputs feeding distributed digital signal processors. IC Role / Device Role / Timing Role: Fast-response TVS parallel to bulk capacitance to suppress ringing and cross-talk from adjacent high-speed data lines. Use Value: Sub-nanosecond response time and low junction capacitance (<100 pF at 0 V) avoid signal integrity degradation on 100 Mbps+ backplanes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ40A | Same SMA package, 40 V VWM, but lower PPPM (400 W) and higher VC (69.4 V at 7.2 A); not AEC-Q101 qualified. | Lacks automotive qualification; suitable for commercial/industrial use only where 500 W headroom and AEC compliance are non-critical. | Select SMA5J40AHE3_A/I when automotive qualification, higher surge margin, or tighter clamping is required. |
| ON Semiconductor 1.5SMC40A | Same electrical specs (40 V VWM, 500 W PPPM), but DO-214AB (SMB) package - 2.5 mm wider, incompatible with SMA footprints. | Requires PCB redesign due to larger SMB outline; not drop-in replaceable without layout change. | Choose SMA5J40AHE3_A/I for space-constrained designs using DO-214AC footprint and AEC-Q101 assurance. |
Compared with SMAJ40A and 1.5SMC40A, the SMA5J40AHE3_A/I delivers superior automotive-grade reliability, tighter clamping (64.5 V vs. ≥69 V), and exact SMA (DO-214AC) mechanical compatibility - making it optimal for new automotive and high-density industrial designs where footprint, qualification, and clamping precision are jointly critical.
Availability
SMA5J40AHE3_A/I is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and DC-DC converter input surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMA5J40AHE3_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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SMA5J series is engineered for high-power-density transient suppression in automotive, industrial, and telecom systems - delivering robust 500 W surge handling in compact SMA packages with AEC-Q101 validation.
FAQ
What is the clamping voltage of the SMA5J40AHE3_A/I under maximum rated surge conditions?
The SMA5J40AHE3_A/I has a maximum clamping voltage (VC) of 64.5 V at 7.8 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per JEDEC standards and reflects the actual voltage seen by protected circuitry during worst-case surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is the SMA5J40AHE3_A/I qualified for automotive applications?
Yes, the SMA5J40AHE3_A/I carries the HE3 suffix, indicating it is RoHS-compliant and AEC-Q101 qualified. This certification covers stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing - confirming suitability for under-hood and body-control module applications.
What is the thermal resistance from junction to ambient for the SMA5J40AHE3_A/I?
The SMA5J40AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W when mounted on the recommended 0.2" × 0.2" copper pads per terminal. This value assumes standard FR-4 PCB construction and is essential for calculating steady-state temperature rise during repetitive surge events or elevated ambient conditions.
Does the SMA5J40AHE3_A/I have bidirectional capability?
No, the SMA5J40AHE3_A/I is a unidirectional TVS diode, as indicated by the "A" suffix (vs. "CA" for bidirectional). It conducts only in reverse avalanche mode; forward conduction occurs above ~3.5 V, limiting its use to DC-biased protection topologies where polarity is fixed.
What packaging format does the SMA5J40AHE3_A/I ship in?
The SMA5J40AHE3_A/I ships in 13" diameter plastic tape and reel format (package code "I"), with 7500 units per reel. This configuration supports high-volume automated assembly and is compatible with standard SMT feeders - verified by Vishay's MSL level 1 rating and J-STD-002 solderability compliance.
SMA5J40AHE3_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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA5J40AHE3_A/I FAQ
1.How can I place an order for SMA5J40AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J40AHE3_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 SMA5J40AHE3_A/I reliable?
The price and inventory of SMA5J40AHE3_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 SMA5J40AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMA5J40AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J40AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J40AHE3_A/I?
SMA5J40AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J40AHE3_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 SMA5J40AHE3_A/I?
For technical support, including SMA5J40AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J40AHE3_A/I requirements.
6.How does Aetrix verify that SMA5J40AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMA5J40AHE3_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 SMA5J40AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMA5J40AHE3_A/I?
All SMA5J40AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J40AHE3_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 SMA5J40AHE3_A/I part is unused and in its original packaging.
Return procedure for SMA5J40AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA5J40AHE3_A/I Tags
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