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Vishay General Semiconductor - Diodes Division SMA5J40CAHM3/I
- Part No.:
- SMA5J40CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J40CAHM3/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,197
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Product details
Overview
SMA5J40CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on power and signal lines. It features a 40 V stand-off voltage (VWM), 49.1 V maximum breakdown voltage (VBR), 64.5 V clamping voltage at 7.8 A peak pulse current (IPPM), and 500 W peak pulse power (PPPM) with 10/1000 μs waveform - used to safeguard automotive sensor interfaces and industrial I/O circuits against ESD and load dump transients.
For engineers reviewing the SMA5J40CAHM3/I datasheet, SMA5J40CAHM3/I pinout, SMA5J40CAHM3/I application, or SMA5J40CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, halogen-free RoHS compliance, thermal resistance (RθJA = 80 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped crowbar during transient events, leveraging a glass-passivated silicon junction for sub-nanosecond response and low incremental surge resistance. Its bidirectional symmetry ensures identical electrical characteristics in both polarities, eliminating polarity marking requirements and simplifying layout in AC-coupled or floating signal paths.
The SMA5J40CAHM3/I is rated for -55 °C to +150 °C operating junction temperature, with thermal performance validated under JEDEC J-STD-020 MSL Level 1 conditions (260 °C peak reflow). Its 500 W PPPM rating is derated linearly above 25 °C ambient per Fig. 2, and it supports unidirectional surge testing only for forward conduction verification (VF = 3.5 V at 25 A).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse voltage before clamping begins; defines safe operating window for protected circuitry. |
| VBR (min/max) | 44.4 V / 49.1 V - breakdown occurs within this range at 1 mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | 64.5 V at 7.8 A - clamping voltage during 10/1000 μs surge; determines worst-case overvoltage seen by downstream ICs. |
| PPPM | 500 W - peak pulse power handling capacity; enables robust protection against IEC 61000-4-5 Level 4 surges. |
| TJ max. | +150 °C - maximum junction temperature; supports operation in under-hood automotive environments. |
| RθJA | 80 °C/W - thermal resistance junction-to-ambient on standard 5.0 mm × 5.0 mm pads; informs PCB thermal design. |
| Package | SMA (DO-214AC) - surface-mount package with 2.54 mm lead pitch; compatible with standard SMT pick-and-place equipment. |
Pinout & Package
SMA5J40CAHM3/I uses the SMA (DO-214AC) package: a molded plastic case with two coplanar matte tin-plated leads, no polarity marking (bidirectional), and UL 94 V-0 flammability rating. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H), with 2.54 mm lead spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (unmarked) | Bidirectional terminal pair | Identical clamping behavior in either direction; no cathode band; terminals interchangeable in layout. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan. |
| Halogen-free & RoHS-compliant | Meets JEDEC JESD201 Class 2 whisker resistance and EU RoHS Directive 2011/65/EU without brominated flame retardants. |
| MSL Level 1 | Rated for unlimited floor life and peak reflow up to 260 °C - eliminates baking requirement prior to assembly. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a/5a), improving clamping precision. |
| High power density | Delivers 500 W surge capability in SMA footprint - reduces board area vs. larger DO-15 or SMB packages. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and jump-start transients in vehicle ECUs. IC Role / Device Role: Bidirectional voltage clamp placed across differential signal pairs or supply rails upstream of interface ICs. Use Value: Clamps 40 V nominal systems to ≤64.5 V during 10/1000 μs surges, preventing latch-up or gate oxide damage in protected transceivers. |
Use Scenario: Safeguarding 24 V DC digital input modules in programmable logic controllers against field-wiring induced surges and relay coil flyback. IC Role / Device Role: Parallel-connected TVS on each input channel, referenced to common ground with minimal trace inductance. Use Value: Withstands ≥500 W pulses without degradation, enabling >100,000 surge cycles per IEC 61000-4-5 compliance testing. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Transient suppression on Ethernet PHY power rails (e.g., 3.3 V, 5 V) and auxiliary bias supplies in PoE-powered switches. IC Role / Device Role: Secondary-level clamping device after primary MOV/GDT stages, providing precise low-voltage clamping. Use Value: 40 V VWM allows use on 36 V nominal telecom rails while maintaining margin to 48 V system max; bidirectional symmetry suits AC-coupled data lines. |
Use Scenario: Input-stage surge protection on universal-input (90–264 VAC) SMPS front-ends, particularly in compact USB-C PD adapters. IC Role / Device Role: Clamp across bulk capacitor terminals to limit voltage overshoot during lightning-induced line surges. Use Value: 500 W PPPM handles 10/1000 μs surges up to 6 kV (line-earth) per IEC 61000-4-5, reducing need for oversized capacitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J40CAHE3_A/H | Same electrical specs; RoHS-compliant but not halogen-free; AEC-Q101 qualified; uses E3 suffix instead of HM3. | Acceptable where halogen content is unrestricted; same automotive qualification level. | Select SMA5J40CAHE3_A/H if halogen-free requirement is waived and cost optimization is prioritized. |
| SMBJ40CA-M3/5A | Higher 600 W PPPM; SMB package (larger footprint, 3.56 mm × 4.60 mm); same VWM/VBR/VC; halogen-free RoHS. | Better surge margin in space-tolerant designs; requires PCB layout change due to larger body and 4.2 mm lead spacing. | Choose SMBJ40CA-M3/5A when higher energy handling is needed and board real estate permits SMB footprint. |
Compared with SMA5J40CAHE3_A/H, the SMA5J40CAHM3/I adds halogen-free compliance without sacrificing AEC-Q101 qualification or clamping performance; versus SMBJ40CA-M3/5A, it trades 100 W PPPM headroom for 30% smaller PCB area and tighter lead pitch - critical for dense automotive module layouts.
Availability
SMA5J40CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface circuits requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMA5J40CAHM3/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, power density, and automotive qualification.
The SMA5J series targets high-reliability transient suppression in space-constrained, thermally demanding environments - specifically engineered for AEC-Q101-compliant automotive electronics and industrial control systems.
FAQ
What is the clamping voltage of the SMA5J40CAHM3/I and how is it measured?
The SMA5J40CAHM3/I has a maximum clamping voltage (VC) of 64.5 V, measured at a peak pulse current (IPPM) of 7.8 A using a 10/1000 μs double-exponential surge waveform. This value is guaranteed per the Vishay datasheet (Doc. #88875, Rev. 09-Jan-2024) and reflects worst-case overvoltage seen by protected circuitry during standardized surge events. The SMA5J40CAHM3/I maintains this clamping performance across its full operating temperature range.
Is SMA5J40CAHM3/I suitable for automotive applications?
Yes, SMA5J40CAHM3/I is AEC-Q101 qualified and explicitly designated for automotive use via the "HM3" suffix, indicating halogen-free, RoHS-compliant, and automotive-grade reliability. It meets stress tests including temperature cycling, high-temperature reverse bias (HTRB), and ESD per AEC-Q101 requirements. The SMA5J40CAHM3/I is commonly deployed in engine control units, ADAS sensor interfaces, and infotainment power rails.
Does SMA5J40CAHM3/I have polarity markings on the package?
No, SMA5J40CAHM3/I is a bidirectional TVS diode and carries no polarity marking - there is no cathode band or anode indicator on the SMA (DO-214AC) case. Its symmetrical construction ensures identical clamping behavior in both directions, allowing flexible PCB placement without orientation constraints. This distinguishes it from unidirectional variants like SMA5J40A, which feature a visible cathode band.
What is the thermal resistance of SMA5J40CAHM3/I and how does it affect PCB layout?
The SMA5J40CAHM3/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 assumes standard JEDEC test conditions and directly impacts thermal design: larger copper areas or internal ground planes reduce RθJA, improving surge endurance. For sustained high-power transients, designers should verify junction temperature stays below 150 °C using this RθJA and actual power dissipation in the SMA5J40CAHM3/I.
How does SMA5J40CAHM3/I differ from SMA5J40A in practical design?
SMA5J40CAHM3/I is bidirectional with no polarity marking and symmetric clamping in both directions, whereas SMA5J40A is unidirectional with a cathode band and conducts only in reverse bias. The SMA5J40CAHM3/I supports AC-coupled or floating signal lines (e.g., CAN, RS-485), while SMA5J40A is limited to DC-biased rails. Additionally, SMA5J40CAHM3/I is halogen-free and AEC-Q101 qualified, unlike standard SMA5J40A variants without HM3 suffix.
SMA5J40CAHM3/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:
- -
- Bidirectional Channels:
- 1
- 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)
SMA5J40CAHM3/I FAQ
1.How can I place an order for SMA5J40CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J40CAHM3/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 SMA5J40CAHM3/I reliable?
The price and inventory of SMA5J40CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J40CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMA5J40CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J40CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J40CAHM3/I?
SMA5J40CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J40CAHM3/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 SMA5J40CAHM3/I?
For technical support, including SMA5J40CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J40CAHM3/I requirements.
6.How does Aetrix verify that SMA5J40CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMA5J40CAHM3/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 SMA5J40CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMA5J40CAHM3/I?
All SMA5J40CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J40CAHM3/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 SMA5J40CAHM3/I part is unused and in its original packaging.
Return procedure for SMA5J40CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA5J40CAHM3/I Tags
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