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Vishay General Semiconductor - Diodes Division SMAJ45CAHE3/61
- Part No.:
- SMAJ45CAHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45CAHE3/61.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,527
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Product details
Overview
SMAJ45CAHE3/61 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 45 V standoff voltage (VWM), 50.0–55.3 V breakdown voltage (VBR) at 1 mA, and clamps transients to ≤72.7 V at 5.5 A peak pulse current (IPPM), with 400 W peak pulse power (10/1000 μs waveform). It is widely deployed in automotive sensor signal lines and industrial I/O interfaces.
For engineers reviewing the SMAJ45CAHE3/61 datasheet, SMAJ45CAHE3/61 pinout, SMAJ45CAHE3/61 application, or SMAJ45CAHE3/61 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, SMA (DO-214AC) package compatibility, and compliance with UL 497B for surge protector classification.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 μA leakage at 45 V), but triggers into low-impedance conduction when reverse (or forward, in bidirectional mode) voltage exceeds VBR, diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown and fast response (<1 ns).
Designed for repetitive transient suppression, it delivers 400 W peak pulse power up to 78 V and derates to 300 W above that threshold, with thermal resistance RθJA = 120 °C/W and RθJL = 30 °C/W. The AEC-Q101 qualified HE3 suffix confirms suitability for automotive environments including engine control modules and ADAS sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 45 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 50.0–55.3 V at 1 mA - Confirmed minimum/maximum voltage at which device enters avalanche conduction; ensures predictable turn-on across temperature and lot variation. |
| VC (Clamping Voltage) | ≤72.7 V at IPPM = 5.5 A - Maximum voltage seen by protected circuit during 10/1000 μs surge; directly limits stress on downstream ICs like microcontrollers or CAN transceivers. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - Surge energy-handling capacity under standard lightning/surge test waveform; sufficient for ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 Level 3. |
| ID (Max Reverse Leakage) | 1.0 μA at VWM - Ultra-low leakage preserves signal integrity and battery life in always-on sensor circuits and low-power automotive ECUs. |
| TJ max. | +150 °C - Enables operation in under-hood automotive locations and industrial enclosures without forced cooling. |
| Package | SMA (DO-214AC) - Surface-mount package with 5.28 mm × 4.50 mm footprint and 2.29 mm height; compatible with automated SMT assembly and meets MSL level 1 (260 °C reflow). |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads. Bidirectional construction means no polarity marking; both terminals are functionally symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient Current Path | Either terminal serves as current entry point during positive or negative transients; bidirectional clamping eliminates need for orientation-aware layout. |
| Case / Body | Thermal & Mechanical Interface | Plastic body provides electrical isolation; copper pad mounting (0.2" × 0.2") required to achieve rated PPPM and thermal performance per datasheet fig. 2. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock-enables use in safety-critical ECU and ADAS subsystems. |
| 400 W peak pulse power (10/1000 μs) | Withstands repeated ISO 7637-2 Pulse 5a (load dump) surges up to 100 V without degradation when properly heatsinked on recommended PCB pads. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during fast transients-critical for protecting 3.3 V or 5 V logic interfaces connected to long cables or inductive loads. |
| UL 497B recognized (QVGQ2) | Meets Underwriters Laboratories requirements for telecom and industrial surge protectors-reduces certification burden in end-equipment safety approvals. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT processes without pre-baking; eliminates moisture-related popcorning risk during manufacturing. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay environments subject to load dump and alternator ripple. IC Role / Device Role / Timing Role: Shunt TVS diode placed across sensor output and ground to clamp transients before they reach ADC input or signal conditioning op-amp. Use Value: Prevents latch-up or permanent damage to 12-bit SAR ADCs by limiting voltage to ≤72.7 V during 100 V/50 ms load dump events. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers exposed to relay coil flyback and ESD from operator interaction. IC Role / Device Role / Timing Role: Bidirectional clamping element between field-side input and internal optocoupler/isolation barrier. Use Value: Ensures immunity to ±1 kV ESD (IEC 61000-4-2) and 400 V/0.5 J surges (IEC 61000-4-4) without degrading signal edge rate or adding capacitance-induced jitter. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Shielding RS-485 transceiver pins in outdoor security camera housings against induced lightning surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Differential-mode TVS pair (one per line) referenced to common ground, providing symmetrical clamping on A/B bus lines. Use Value: Maintains signal integrity up to 10 Mbps by limiting inter-line differential clamping to <100 V while adding only 35 pF junction capacitance at 0 V. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in smart home vacuum cleaners and robotic mowers. IC Role / Device Role / Timing Role: Across-motor terminals to absorb inductive kickback energy during PWM switching transitions. Use Value: Eliminates need for snubber RC networks-reduces BOM count and PCB area while sustaining >100,000 motor start-stop cycles without parameter drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45CA-M3/61 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification; same SMA package. | No functional difference; selected where halogen-free material compliance is mandated by OEM environmental policy. | Choose SMAJ45CA-M3/61 when supply chain requires halogen-free bill-of-materials documentation. |
| SMBJ45CAHE3/61 | Same VWM/VBR/VC ratings but in SMB (DO-214AA) package-larger footprint (4.58 mm × 3.94 mm), higher PPPM (600 W), lower RθJA (80 °C/W). | Better thermal performance and surge margin; requires PCB layout change due to larger pad dimensions and different land pattern. | Choose SMBJ45CAHE3/61 when system-level surge testing exceeds 400 W or ambient temperatures exceed 105 °C. |
Compared with SMAJ45CAHE3/61, SMAJ45CA-M3/61 offers identical protection performance with halogen-free materials, while SMBJ45CAHE3/61 trades smaller board area for higher surge robustness and improved thermal dissipation-neither is pin-compatible without layout revision.
Availability
SMAJ45CAHE3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply and AEC-Q101 assurance.
Supply support for SMAJ45CAHE3/61 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments-targeting automotive, industrial, and telecom systems where failure modes must be mitigated without compromising signal fidelity or thermal performance.
FAQ
What does the "CA" suffix indicate in SMAJ45CAHE3/61?
The "CA" suffix denotes a bidirectional configuration: SMAJ45CAHE3/61 clamps voltage transients of either polarity symmetrically, making it ideal for AC-coupled signal lines or ungrounded interfaces where polarity cannot be guaranteed. Unlike unidirectional variants (e.g., SMAJ45A), it has no cathode marking and exhibits matched VBR in both directions-confirmed as 50.0–55.3 V min/max at 1 mA in the Vishay datasheet.
Is SMAJ45CAHE3/61 suitable for automotive applications?
Yes, SMAJ45CAHE3/61 is AEC-Q101 qualified (per HE3 suffix), meaning it has passed stress tests for temperature cycling, high-temperature operating life, and mechanical shock required for automotive electronics. It is routinely used in engine control units, body control modules, and ADAS sensor interfaces where ISO 7637-2 and ISO 16750-2 compliance is mandatory-and SMAJ45CAHE3/61 meets those standards when mounted per recommended pad layout.
What is the maximum clamping voltage of SMAJ45CAHE3/61 under surge conditions?
The maximum clamping voltage (VC) of SMAJ45CAHE3/61 is 72.7 V at a peak pulse current (IPPM) of 5.5 A, measured using the standardized 10/1000 μs double-exponential surge waveform. This value is guaranteed across temperature and lot variation, and defines the upper voltage limit imposed on protected circuitry during transient events-critical for ensuring compatibility with 48 V automotive architectures and 3.3 V/5 V logic interfaces.
How does the SMA package of SMAJ45CAHE3/61 affect PCB layout?
The SMA (DO-214AC) package of SMAJ45CAHE3/61 requires specific 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 400 W peak pulse power and thermal performance. Deviating from this layout reduces surge capability and increases junction temperature-datasheet fig. 2 shows 30% derating at TA = 85 °C if pads are undersized. The package's 2.29 mm height also constrains mechanical clearance in stacked assemblies.
Does SMAJ45CAHE3/61 meet any safety certifications?
Yes, SMAJ45CAHE3/61 carries Underwriters Laboratories (UL) Recognition under file E136766 for both unidirectional and bidirectional devices, compliant with UL 497B for primary protector classification. This certification validates its use in telecom, industrial, and automotive equipment requiring third-party safety approval-and applies specifically to the HE3-suffix AEC-Q101 qualified version documented in Vishay datasheet 88390.
SMAJ45CAHE3/61 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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 5.5A
- Power - Peak Pulse:
- 400W
- 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)
SMAJ45CAHE3/61 FAQ
1.How can I place an order for SMAJ45CAHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45CAHE3/61 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 SMAJ45CAHE3/61 reliable?
The price and inventory of SMAJ45CAHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ45CAHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ45CAHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45CAHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45CAHE3/61?
SMAJ45CAHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45CAHE3/61 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 SMAJ45CAHE3/61?
For technical support, including SMAJ45CAHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45CAHE3/61 requirements.
6.How does Aetrix verify that SMAJ45CAHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ45CAHE3/61 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 SMAJ45CAHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ45CAHE3/61?
All SMAJ45CAHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45CAHE3/61, 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 SMAJ45CAHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ45CAHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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