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Vishay General Semiconductor - Diodes Division SMA5J40CAHM3_A/I
- Part No.:
- SMA5J40CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J40CAHM3_A/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMA5J40CAHM3_A/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), 44.4–49.1 V breakdown voltage (VBR), 64.5 V maximum clamping voltage (VC) 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, industrial I/O ports, and telecom line drivers against ESD and lightning-induced transients.
For engineers reviewing the SMA5J40CAHM3_A/I datasheet, SMA5J40CAHM3_A/I pinout, SMA5J40CAHM3_A/I application, or SMA5J40CAHM3_A/I equivalent, key selection criteria include bidirectional clamping symmetry, low incremental surge resistance, AEC-Q101 qualification status, thermal resistance (RθJA = 80 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, with identical electrical characteristics forward and reverse - enabling robust protection of AC-coupled or differential signal paths without polarity sensitivity. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1.0 ns), critical for suppressing sub-microsecond transients.
The device is rated for 150 °C maximum junction temperature and meets MSL Level 1 per J-STD-020 (peak reflow 260 °C). Its halogen-free, RoHS-compliant construction (HM3 suffix) and AEC-Q101 qualification confirm suitability for automotive under-hood and infotainment applications requiring long-term reliability under thermal cycling and humidity stress.
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 for protected circuitry. |
| VBR min/max | 44.4 V / 49.1 V at 1 mA - guaranteed breakdown threshold range; ensures consistent turn-on across production lots and temperature. |
| VC @ IPPM | 64.5 V at 7.8 A - clamped voltage during 10/1000 µs surge; determines worst-case overvoltage seen by downstream ICs. |
| PPPM | 500 W - peak pulse power handling capability; enables protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 24 V systems. |
| RθJA | 80 °C/W - junction-to-ambient thermal resistance; requires ≥5.0 mm × 5.0 mm copper pad per terminal for full derating to 150 °C. |
| TJ max. | +150 °C - maximum junction temperature; supports operation in under-hood automotive environments and industrial enclosures. |
| Package | SMA (DO-214AC) - surface-mount package with 2.54 mm lead pitch; compatible with standard 7" or 13" tape-and-reel SMT assembly. |
Pinout & Package
SMA (DO-214AC) package: molded plastic body with two coplanar matte tin-plated leads; no polarity marking for bidirectional types; meets UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional surge conduction path | No functional polarity - either terminal serves as anode or cathode depending on transient polarity; enables AC line or differential pair protection without orientation constraints. |
| Case (plastic body) | Thermal and mechanical interface | Non-conductive housing; heat dissipation occurs solely through leads to PCB copper; requires thermal relief design per Vishay recommended pad layout. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Identical VBR, VC, and IPPM in both directions - eliminates need for polarity-aware layout and supports balanced differential signaling (e.g., RS-485, CAN FD). |
| Glass-passivated junction | Stable leakage <1.0 µA at 40 V and 25 °C - prevents standby current degradation in battery-powered sensors and low-power IoT nodes. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HAST, and mechanical shock - required for ADAS camera modules and body control units. |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ratio = ~1.45) - reduces voltage overshoot during fast-rising transients compared to higher-Rsurge TVS devices. |
| MSL Level 1 moisture sensitivity | Unlimited floor life at ≤30 °C/60% RH - allows direct use from reel without baking, reducing manufacturing overhead in high-volume automotive electronics assembly. |
Applications
| Automotive Sensor Protection | Industrial PLC Analog Inputs |
|---|---|
Use Scenario: Protecting 12 V/24 V automotive pressure and temperature sensor outputs from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor output line and ground, absorbing up to 500 W surge energy within nanoseconds. Use Value: Prevents latch-up or gate oxide damage in downstream op-amps and ADCs while maintaining signal integrity below 40 V DC operating range. |
Use Scenario: Shielding 4–20 mA current loop inputs in programmable logic controllers from field wiring surges and ESD events. IC Role / Device Role / Timing Role: Transient suppressor connected across input terminals to shunt induced common-mode transients before they reach precision current-to-voltage converter. Use Value: Maintains loop accuracy by limiting clamped voltage to 64.5 V, well below typical PLC input stage breakdown thresholds (≥75 V). |
| Telecom Line Interface | Consumer USB Power Delivery |
Use Scenario: Safeguarding Ethernet PHY or DSL line drivers against lightning-induced surges on outdoor-facing ports. IC Role / Device Role / Timing Role: Primary-level TVS mounted at connector entry point, clamping bidirectional transients on differential pairs before magnetics or isolation transformers. Use Value: Withstands 10/1000 µs surges up to 7.8 A while adding <1 pF junction capacitance - preserves signal integrity up to 100 MHz. |
Use Scenario: Secondary-side overvoltage protection on 5–20 V USB PD bus lines in portable chargers and power banks. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after buck converter output to clamp inductive kickback and hot-swap transients. Use Value: 40 V VWM aligns with USB PD 3.0 extended range (up to 20 V); 64.5 V VC ensures protected PMIC remains within absolute maximum ratings during 500 W surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J40CAHE3_A/I | RoHS-compliant but not halogen-free; AEC-Q101 qualified; same VWM/VBR/VC/PPPM specs. | Acceptable for non-halogen-restricted automotive programs; lacks halogen-free certification required by some Tier 1 OEMs. | Select SMA5J40CAHE3_A/I only if halogen content is not mandated; otherwise SMA5J40CAHM3_A/I is preferred for full compliance. |
| SMB5J40CA-M3/5A | Same electrical specs but SMB (DO-214AA) package - 3.5 mm × 4.6 mm vs. SMA's 4.9 mm × 5.3 mm; RθJA ≈ 65 °C/W (lower thermal resistance). | Better thermal performance but larger footprint; may require PCB redesign; not drop-in compatible due to different pad layout and lead pitch. | Choose SMB5J40CA-M3/5A only when board space permits and thermal margin is critical; SMA5J40CAHM3_A/I remains optimal for compact, high-density layouts. |
Compared with SMA5J40CAHE3_A/I, the HM3 variant adds halogen-free compliance without sacrificing AEC-Q101 qualification or electrical performance; versus SMB5J40CA-M3/5A, SMA5J40CAHM3_A/I trades slightly higher thermal resistance for smaller footprint and proven compatibility with existing SMA-reflow profiles.
Availability
SMA5J40CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC analog inputs, and telecom line interface applications requiring stable component supply, AEC-Q101 qualification, and halogen-free compliance.
Supply support for SMA5J40CAHM3_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, and protection devices with emphasis on reliability, power density, and automotive-grade validation.
The SMA5J series was developed specifically for high-power-density transient suppression in space-constrained automotive and industrial systems, balancing 500 W surge capability with SMA package manufacturability and thermal performance.
FAQ
What is the clamping voltage of the SMA5J40CAHM3_A/I under a 10/1000 µs surge?
The SMA5J40CAHM3_A/I has a maximum clamping voltage (VC) of 64.5 V at 7.8 A peak pulse current (IPPM) under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and represents the worst-case voltage imposed on protected circuitry during a standardized surge event - critical for verifying downstream ICs remain within their absolute maximum ratings.
Is the SMA5J40CAHM3_A/I suitable for automotive applications?
Yes, the SMA5J40CAHM3_A/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction validated for automotive use. It supports operating junction temperatures up to +150 °C and meets MSL Level 1, making it appropriate for engine control units, ADAS sensor interfaces, and body electronics where reliability under thermal and mechanical stress is mandatory.
Does the SMA5J40CAHM3_A/I have polarity markings on the package?
No, the SMA5J40CAHM3_A/I does not have polarity markings because it is a bidirectional TVS diode. The device functions identically in both directions, with symmetrical breakdown and clamping characteristics - eliminating the need for orientation-specific placement during SMT assembly and simplifying layout for AC-coupled or differential signal lines.
What is the thermal resistance of the SMA5J40CAHM3_A/I, and how does it affect PCB layout?
The SMA5J40CAHM3_A/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. To achieve rated 500 W pulse power without exceeding 150 °C junction temperature, designers must implement minimum pad dimensions and consider thermal vias - undersized pads will cause premature thermal derating and reduced surge capability.
How does the SMA5J40CAHM3_A/I differ from unidirectional variants like SMA5J40A?
The SMA5J40CAHM3_A/I is bidirectional with symmetrical clamping in both polarities, whereas SMA5J40A is unidirectional and conducts only in reverse bias. The "CA" suffix denotes bidirectionality, resulting in identical VBR, VC, and IPPM values regardless of transient polarity - essential for protecting AC signals, differential buses, or circuits where voltage reversal is possible, unlike unidirectional types limited to DC rail protection.
SMA5J40CAHM3_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:
- -
- 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_A/I FAQ
1.How can I place an order for SMA5J40CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J40CAHM3_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 SMA5J40CAHM3_A/I reliable?
The price and inventory of SMA5J40CAHM3_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 SMA5J40CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMA5J40CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J40CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J40CAHM3_A/I?
SMA5J40CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J40CAHM3_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 SMA5J40CAHM3_A/I?
For technical support, including SMA5J40CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J40CAHM3_A/I requirements.
6.How does Aetrix verify that SMA5J40CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMA5J40CAHM3_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 SMA5J40CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMA5J40CAHM3_A/I?
All SMA5J40CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J40CAHM3_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 SMA5J40CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMA5J40CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA5J40CAHM3_A/I Tags
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