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Vishay General Semiconductor - Diodes Division SMA5J40CAHE3_A/H
- Part No.:
- SMA5J40CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J40CAHE3_A/H.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,522
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Product details
Overview
SMA5J40CAHE3_A/H 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 rating with 10/1000 μs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMA5J40CAHE3_A/H datasheet, SMA5J40CAHE3_A/H pinout, SMA5J40CAHE3_A/H application, or SMA5J40CAHE3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, RoHS-compliant matte tin terminals, MSL Level 1 moisture sensitivity, and thermal resistance of 80 °C/W junction-to-ambient.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling suppression of positive and negative transients without polarity dependency. Its glass-passivated junction ensures stable leakage performance (<1.0 μA at VWM) and fast response time under ESD and lightning-induced surges.
The device is rated for 150 °C maximum junction temperature and derates linearly above 25 °C ambient per Figure 2; thermal impedance data confirms effective heat dissipation when mounted on 5.0 mm × 5.0 mm copper pads per JEDEC standard layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR (min/max) | 44.4 V / 49.1 V - Breakdown occurs within this band at 1 mA test current; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 64.5 V - Clamped voltage across device at 7.8 A peak pulse current; determines maximum stress imposed on downstream components. |
| PPPM | 500 W - Peak pulse power handling with 10/1000 μs waveform; supports robust protection against IEC 61000-4-5 Level 4 surges. |
| ID @ VWM | <1.0 μA - Reverse leakage at stand-off voltage; minimizes standby power loss and avoids false triggering in low-current systems. |
| RθJA | 80 °C/W - Junction-to-ambient thermal resistance; requires adequate PCB copper area to maintain TJ ≤ 150 °C under repeated surges. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 solderability and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional terminal pair | No functional distinction between terminals; either side connects to protected line, other to ground or reference rail. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per JESD22 standards. |
| Glass passivated junction | Ensures long-term stability of VBR and ID under thermal stress and humid environments, critical for industrial field deployments. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without preconditioning; eliminates moisture-related popcorning risk. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a), improving protection margin for sensitive ICs. |
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 inductive switching transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and chassis ground to limit transient excursions below IC absolute maximum ratings. Use Value: Enables compliance with ISO 16750-2 and ISO 7637-2 test pulses while maintaining signal integrity through low capacitance and sub-1 μA leakage. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to relay coil flyback and motor drive noise in factory automation. IC Role / Device Role / Timing Role: Transient shunt connected across isolated input optocoupler or ADC front-end to absorb repetitive 500 W surges without degradation. Use Value: Delivers 500 W peak pulse power handling with 64.5 V clamping to prevent latch-up or permanent damage to microcontroller GPIOs. |
| Telecom Power Line Protection | Consumer USB Port ESD Suppression |
Use Scenario: Secondary-side surge protection on 48 V DC power feeds in PoE-powered network switches and base station remote radios. IC Role / Device Role / Timing Role: High-power TVS placed after DC-DC converter output to clamp lightning-induced surges entering via Ethernet cabling. Use Value: Withstands 500 W pulses and maintains <1 μA leakage at 40 V, ensuring minimal impact on power efficiency and regulation accuracy. |
Use Scenario: Board-level ESD protection for USB 2.0 data lines and VBUS in smart home hubs and portable media devices. IC Role / Device Role / Timing Role: Bidirectional clamp bridging D+ and D− or VBUS and GND to divert ±8 kV contact discharge per IEC 61000-4-2. Use Value: Fast response time and symmetrical clamping enable reliable protection without signal distortion or timing skew on high-speed differential pairs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J40CA-M3/61 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification; same SMA package and thermal performance. | No functional difference in protection behavior; selected where halogen-free material compliance is mandated by OEM environmental policy. | Direct substitution if halogen-free requirement applies; no layout or test changes needed. |
| SMCJ40CAHE3_A/H | Same VWM/VBR/VC ratings but in larger SMC (DO-214AB) package; higher RθJA (40 °C/W vs. 80 °C/W) and 1500 W PPPM rating. | Used where higher single-pulse energy absorption is required, such as primary-side AC/DC input protection or heavy-industrial motor controls. | Choose SMCJ40CAHE3_A/H only when >500 W pulse power is needed; requires larger PCB footprint and different pad layout. |
Compared with SMA5J40CAHE3_A/H, SMA5J40CA-M3/61 offers identical protection performance with halogen-free construction, while SMCJ40CAHE3_A/H trades smaller size for 3× higher pulse power and lower thermal resistance - making it suitable for more demanding surge environments at the cost of board space.
Availability
SMA5J40CAHE3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom power supplies, and consumer USB port protection requiring stable component supply and AEC-Q101 assurance.
Supply support for SMA5J40CAHE3_A/H 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 is engineered for high-power-density transient suppression in space-constrained applications, targeting automotive, industrial, and telecom systems where AEC-Q101 compliance and robust 10/1000 μs surge handling are mandatory.
FAQ
What is the clamping voltage of the SMA5J40CAHE3_A/H under peak pulse conditions?
The SMA5J40CAHE3_A/H clamps to a maximum of 64.5 V at its rated peak pulse current of 7.8 A with a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMA5J40CAHE3_A/H maintains this clamping performance across its full operating temperature range when properly mounted on recommended copper pads.
Is the SMA5J40CAHE3_A/H suitable for automotive applications?
Yes, the SMA5J40CAHE3_A/H is AEC-Q101 qualified and explicitly designated for automotive use with suffix "HE3". It meets stress test requirements for temperature cycling, humidity bias, and mechanical shock, and is rated for operation from –55 °C to +150 °C junction temperature. The SMA5J40CAHE3_A/H is commonly used in engine control units, body electronics, and ADAS sensor modules where transient immunity is critical.
Does the SMA5J40CAHE3_A/H have polarity markings?
No, the SMA5J40CAHE3_A/H is a bidirectional TVS diode and carries no polarity marking on its SMA (DO-214AC) package. Unlike unidirectional variants, it functions identically regardless of orientation in the circuit - both terminals are electrically symmetrical. This simplifies layout and eliminates risk of incorrect placement during automated assembly.
What is the maximum reverse leakage current for the SMA5J40CAHE3_A/H at its stand-off voltage?
The SMA5J40CAHE3_A/H exhibits a maximum reverse leakage current of 1.0 μA at its 40 V stand-off voltage (VWM), measured at 25 °C ambient. This ultra-low leakage ensures minimal power drain in battery-operated systems and prevents false triggering in high-impedance sensing circuits. Leakage remains within specification up to 125 °C junction temperature per derating curves in the datasheet.
Can the SMA5J40CAHE3_A/H be used in place of a unidirectional TVS like SMA5J40AHE3_A/H?
No - the SMA5J40CAHE3_A/H is bidirectional and cannot replace unidirectional types like SMA5J40AHE3_A/H in circuits requiring forward conduction or DC bias blocking in one direction only. While both share VWM and PPPM ratings, the unidirectional version has a defined cathode band and conducts forward current up to 40 A IFSM, whereas the SMA5J40CAHE3_A/H blocks in both directions and lacks forward surge rating.
SMA5J40CAHE3_A/H 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA5J40CAHE3_A/H FAQ
1.How can I place an order for SMA5J40CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J40CAHE3_A/H 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 SMA5J40CAHE3_A/H reliable?
The price and inventory of SMA5J40CAHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J40CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMA5J40CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J40CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J40CAHE3_A/H?
SMA5J40CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J40CAHE3_A/H 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 SMA5J40CAHE3_A/H?
For technical support, including SMA5J40CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J40CAHE3_A/H requirements.
6.How does Aetrix verify that SMA5J40CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMA5J40CAHE3_A/H 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 SMA5J40CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMA5J40CAHE3_A/H?
All SMA5J40CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J40CAHE3_A/H, 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 SMA5J40CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMA5J40CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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