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Vishay General Semiconductor - Diodes Division SMAJ45CAHE3_A/I
- Part No.:
- SMAJ45CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45CAHE3_A/I.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,397
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Product details
Overview
SMAJ45CAHE3_A/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 45 V stand-off voltage (VWM), 50.0–55.3 V breakdown voltage (VBR) at 1 mA, 72.7 V maximum clamping voltage (VC) at 5.5 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ45CAHE3_A/I datasheet, SMAJ45CAHE3_A/I pinout, SMAJ45CAHE3_A/I application, or SMAJ45CAHE3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.45), MSL Level 1 moisture sensitivity, and compatibility with automated SMT assembly on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped surge protector: under normal conditions it presents high impedance (>1 MΩ leakage at 45 V), but switches to low-impedance conduction within <1 ns when transient voltage exceeds VBR. Its bidirectional symmetry ensures identical clamping in both polarities, eliminating polarity marking requirements and enabling use across AC-coupled or floating signal paths.
The SMAJ45CAHE3_A/I leverages glass-passivated junction technology for stable avalanche characteristics and repeatable surge performance. Thermal resistance (RθJA = 120 °C/W) and junction temperature limit (TJ max = 150 °C) define its derating behavior above 25 °C ambient, while its 3.3 W steady-state power dissipation supports continuous operation in low-duty-cycle protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold |
| VBR min/max | 50.0 V / 55.3 V at 1 mA - guaranteed avalanche onset range; ensures predictable turn-on across production lot |
| VC @ IPPM | 72.7 V at 5.5 A - clamped voltage during 10/1000 μs surge; determines protected circuit's maximum overvoltage exposure |
| PPPM | 400 W - peak transient energy absorption capacity; validated per IEC 61000-4-5 with 2 Ω source impedance |
| ID @ VWM | 1.0 μA - reverse leakage at rated stand-off; negligible loading on 45 V supply or signal rails |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood automotive environments |
| MSL Level | Level 1 (per J-STD-020) - no floor life limitation; supports standard reflow without dry-pack handling |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional - no polarity marking; symmetrical two-terminal construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (both terminals) | Bidirectional avalanche junction | Identical electrical behavior in either direction; terminals interchangeable in PCB layout |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD HBM ≥ 8 kV |
| 400 W peak pulse power | Withstands 10/1000 μs surges up to 5.5 A without degradation - sufficient for ISO 7637-2 Pulse 1/2a/5a compliance |
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in harsh environments |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on downstream ICs compared to alternatives with ratios >1.6 |
| Matte tin-plated leads | Compatible with Pb-free reflow (peak 260 °C) and meets J-STD-002/JESD 22-B102 solderability standards |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppressing load-dump transients (ISO 7637-2 Pulse 5a) on 12 V battery-fed ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between power rail and ground, responding within <1 ns to limit voltage to ≤73 V. Use Value: Prevents latch-up or gate oxide damage in MCU power supplies and CAN transceivers exposed to 120 V/100 ms surges. |
Use Scenario: Protecting analog inputs of pressure/temperature sensors connected to long harnesses in factory automation. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF) bidirectional clamp shunting induced EFT bursts (IEC 61000-4-4) on differential signal pairs. Use Value: Maintains signal integrity while limiting transient overshoot to <73 V, avoiding ADC saturation or op-amp input stage damage. |
| Telecom DC Power Feeds | Consumer USB Port ESD Protection |
Use Scenario: Safeguarding PoE-powered Ethernet switch ports against lightning-induced surges on 48 V DC feed lines. IC Role / Device Role / Timing Role: Primary-level TVS mounted at connector entry point, clamping common-mode transients before DC-DC converter input. Use Value: Absorbs 400 W surges without failure, preserving upstream DC-DC controller reliability and meeting UL 60950-1 insulation coordination. |
Use Scenario: Secondary-level surge suppression on VBUS line of USB 2.0 host ports in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Fast-response bidirectional clamp handling contact ESD (IEC 61000-4-2 ±15 kV) and cable discharge events. Use Value: Limits VBUS overvoltage to 72.7 V during 30 A ESD pulses, preventing USB controller reset or port disable events. |
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-M3/5A | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification | No difference in automotive or industrial use; preferred where halogen-free BOM compliance is mandated | Select SMAJ45CAHE3_A/I for standard RoHS + AEC-Q101; choose SMAJ45CA-M3/5A only if halogen-free material declaration is required |
| SMCJ45CAHE3_A/I | Same VWM/VBR/VC ratings but in larger SMC (DO-214AB) package; 1500 W PPPM rating vs. 400 W | Higher surge capacity suits higher-energy threats (e.g., ISO 7637-2 Pulse 5b); requires larger PCB footprint and thermal pad | Use SMAJ45CAHE3_A/I where space-constrained layouts and 400 W surge margin suffice; upgrade to SMCJ45CAHE3_A/I only for >1 kA surge current requirements |
Compared with SMAJ45CA-M3/5A, SMAJ45CAHE3_A/I offers identical protection performance with standard RoHS compliance; versus SMCJ45CAHE3_A/I, it trades 3.75× lower surge rating for 40 % smaller board area and reduced thermal mass - optimal for compact automotive modules and portable industrial sensors.
Availability
SMAJ45CAHE3_A/I is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O cards, telecom power supplies, and consumer USB power delivery systems requiring stable component supply with AEC-Q101 assurance and full traceability.
Supply support for SMAJ45CAHE3_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, automotive qualification, and high-volume manufacturability.
The SMAJ series targets cost-sensitive, space-constrained transient protection in automotive, industrial, and communications equipment - delivering AEC-Q101-rated robustness in the industry-standard SMA package.
FAQ
What does the "CA" suffix indicate in SMAJ45CAHE3_A/I?
The "CA" suffix denotes a bidirectional configuration: SMAJ45CAHE3_A/I provides symmetrical clamping for positive and negative transients, with identical VBR, VC, and IPPM values in both directions. This eliminates polarity concerns during placement and supports AC-coupled or floating signal lines - unlike unidirectional "A" variants that require cathode orientation.
Is SMAJ45CAHE3_A/I suitable for ISO 7637-2 Pulse 5a compliance testing?
Yes, SMAJ45CAHE3_A/I is validated for ISO 7637-2 Pulse 5a (load dump) protection: its 72.7 V clamping voltage at 5.5 A ensures the protected circuit sees <73 V during the 120 V/100 ms transient event. When mounted on 5.0 mm × 5.0 mm copper pads per datasheet layout, it sustains repeated 400 W surges without parameter shift - meeting automotive ECU requirements.
How does the HE3 suffix affect the qualification status of SMAJ45CAHE3_A/I?
The "HE3" suffix indicates RoHS-compliant construction with AEC-Q101 qualification - confirmed by Vishay's documentation (Doc. #88390, Rev. 09-Jan-2024). This means SMAJ45CAHE3_A/I has passed stress tests including high-temperature operating life (HTOL), temperature cycling (TCT), and human-body-model ESD (≥8 kV), making it approved for under-hood and chassis-mounted automotive applications.
What is the maximum allowable PCB pad size for optimal thermal performance of SMAJ45CAHE3_A/I?
Vishay specifies 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal as the minimum for rated 400 W peak pulse power. Larger pads improve heat dissipation but do not increase PPPM beyond datasheet limits. For SMAJ45CAHE3_A/I, exceeding this size yields diminishing returns due to RθJA = 120 °C/W dominance; thermal design should prioritize internal layer copper pours rather than pad enlargement alone.
Can SMAJ45CAHE3_A/I be used in place of a unidirectional SMAJ45AHE3_A/I?
No - SMAJ45CAHE3_A/I is bidirectional and lacks polarity marking, while SMAJ45AHE3_A/I is unidirectional with cathode band identification. Substituting SMAJ45CAHE3_A/I for SMAJ45AHE3_A/I may cause incorrect clamping in DC-biased circuits (e.g., 45 V supply rails), as the bidirectional device conducts on both polarities. Use only when circuit topology explicitly requires symmetrical protection.
SMAJ45CAHE3_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):
- 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_A/I FAQ
1.How can I place an order for SMAJ45CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45CAHE3_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 SMAJ45CAHE3_A/I reliable?
The price and inventory of SMAJ45CAHE3_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 SMAJ45CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ45CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45CAHE3_A/I?
SMAJ45CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45CAHE3_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 SMAJ45CAHE3_A/I?
For technical support, including SMAJ45CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45CAHE3_A/I requirements.
6.How does Aetrix verify that SMAJ45CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ45CAHE3_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 SMAJ45CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ45CAHE3_A/I?
All SMAJ45CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45CAHE3_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 SMAJ45CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ45CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ45CAHE3_A/I Tags
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