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Vishay General Semiconductor - Diodes Division SMAJ45A-E3/61
- Part No.:
- SMAJ45A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45A-E3/61.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,113
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Product details
Overview
SMAJ45A-E3/61 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 45 V stand-off 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 capability under 10/1000 μs waveform. It is commonly deployed across automotive power supply lines, industrial sensor interfaces, and DC input rails in embedded controllers.
For engineers reviewing the SMAJ45A-E3/61 datasheet, SMAJ45A-E3/61 pinout, SMAJ45A-E3/61 application, or SMAJ45A-E3/61 equivalent, key selection criteria include its unidirectional polarity, SMA (DO-214AC) surface-mount package, 1.0 μA max reverse leakage at VWM, 120 °C/W junction-to-ambient thermal resistance, and AEC-Q101 qualification eligibility via HE3 suffix variants.
Technical Context
The SMAJ45A-E3/61 operates as a clamping-type TVS diode using an avalanche breakdown mechanism to divert surge energy away from protected circuitry. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance, enabling fast response (<1 ns) to ESD and lightning-induced transients.
It is rated for non-repetitive 400 W peak pulse power (10/1000 μs) on 0.2" × 0.2" copper pads, derating linearly above 25 °C ambient per Fig. 2, and supports 40 A peak forward surge current (8.3 ms half-sine) in unidirectional configuration only. Polarity is marked by a cathode band on the SMA package body.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 45 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC bias margin. |
| VBR (Breakdown Voltage) | 50.0–55.3 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above system nominal voltage. |
| VC (Clamping Voltage) | ≤72.7 V at IPPM = 5.5 A - Peak voltage seen by protected IC during surge; determines minimum withstand rating required downstream. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - Surge energy handling capacity on standard PCB pad layout; sufficient for IEC 61000-4-5 Level 3 (1 kV/2 Ω). |
| ID (Reverse Leakage) | ≤1.0 μA at 45 V - Negligible standby current draw; avoids loading low-power sensor or battery-backed circuits. |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient; informs derating requirements in enclosed or high-TA environments. |
| Package | SMA (DO-214AC) - Industry-standard SMD outline; compatible with automated pick-and-place and reflow profiles up to 260 °C (MSL Level 1). |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads. Cathode indicated by a single band on the body; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink node | Connected to protected line (e.g., +12 V rail); conducts avalanche current to ground during overvoltage event. |
| Anode (unbanded end) | Reference / return path | Typically tied to system ground or low-impedance return plane; completes clamping path during transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables compliance with IEC 61000-4-5 surge immunity testing up to 1 kV open-circuit voltage in industrial and automotive applications. |
| Glass-passivated junction | Ensures stable VBR over temperature and lifetime; eliminates parameter drift due to moisture or contamination in harsh environments. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ESD >15 kV), improving protection margin for sub-5 V logic ICs. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free assembly without pre-baking; eliminates yield loss or delamination risk in high-volume SMT production. |
| AEC-Q101 qualification path | HE3 suffix variants are qualified for automotive powertrain and body electronics; enables drop-in use in ASIL-B–compatible designs with traceable lot data. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Clamp |
|---|---|
|
Use Scenario: 12 V battery-fed ECUs exposed to load dump (ISO 16750-2) and alternator ripple. IC Role / Device Role / Timing Role: Primary clamping device placed between battery rail and DC-DC input stage. Use Value: Limits transient voltage to ≤72.7 V, protecting downstream regulators and microcontrollers rated for 80 V absolute maximum. |
Use Scenario: 24 V analog sensor outputs (e.g., pressure, temperature) routed through long harnesses in factory automation. IC Role / Device Role / Timing Role: Point-of-entry TVS on signal line before op-amp buffer or ADC input. Use Value: Suppresses inductive switching noise (e.g., relay coil kickback) while maintaining <1.0 μA leakage to preserve signal integrity and offset accuracy. |
| Consumer Device USB Power Port | Telecom DC Feeder Line Protection |
|
Use Scenario: 5 V USB-C power delivery inputs in portable monitors or docking stations subjected to hot-plug ESD. IC Role / Device Role / Timing Role: Secondary overvoltage clamp after primary ESD array; handles higher-energy surges. Use Value: Clamps 8 kV contact ESD (IEC 61000-4-2) to <72.7 V within <1 ns, preventing latch-up in USB PD controller ICs. |
Use Scenario: -48 V DC telecom power feeders entering base station cabinets exposed to lightning-induced surges. IC Role / Device Role / Timing Role: First-stage surge diverter on power entry board before bulk capacitance and DC-DC conversion. Use Value: Absorbs 400 W pulses (10/1000 μs) without degradation, sustaining operation across 100+ surge events per MIL-STD-883H Method 3015.8. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A-M3/61 | Halogen-free, RoHS-compliant variant; identical electrical specs and package; same thermal performance. | No functional difference; selected where halogen-free BOM compliance is mandated (e.g., EU public infrastructure projects). | Choose SMAJ45A-M3/61 when halogen-free material declaration is contractually required; no design or layout change needed. |
| SMAJ45AHE3_A/61 | AEC-Q101 qualified version; includes extended reliability testing (HTOL, TC, UHAST); same VWM/VBR/VC ratings. | Required for automotive powertrain, chassis, or ADAS modules needing automotive-grade qualification evidence. | Select SMAJ45AHE3_A/61 for automotive OEM or Tier-1 programs requiring full AEC-Q101 test reports and PPAP documentation. |
Compared with SMAJ45A-E3/61, the M3 variant satisfies halogen-free mandates without altering surge performance, while the HE3 variant adds automotive qualification rigor-neither changes PCB layout or electrical behavior, but addresses distinct compliance and market-access requirements.
Availability
SMAJ45A-E3/61 is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, and telecom DC feeder line hardening requiring stable component supply and consistent parametric performance across production lots.
Supply support for SMAJ45A-E3/61 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-energy transient suppression in space-constrained surface-mount applications, targeting automotive, industrial, and telecom systems where robustness against ISO 7637-2, IEC 61000-4-5, and ESD events is critical.
FAQ
What is the maximum clamping voltage of the SMAJ45A-E3/61 under surge conditions?
The SMAJ45A-E3/61 has a maximum clamping voltage (VC) of 72.7 V at 5.5 A peak pulse current (IPPM), measured with a 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during standardized surge events and is confirmed in the Vishay datasheet Document Number 88390, page 2. The SMAJ45A-E3/61 maintains this clamping performance across its specified operating temperature range.
Is the SMAJ45A-E3/61 suitable for automotive applications?
The SMAJ45A-E3/61 itself is commercial-grade and not AEC-Q101 qualified; however, the functionally identical SMAJ45AHE3_A/61 variant is fully AEC-Q101 qualified and approved for automotive use. Engineers selecting the SMAJ45A-E3/61 for automotive prototyping must verify qualification status per application requirements-SMAJ45A-E3/61 may be used in non-safety-critical infotainment or accessory modules where full qualification is not mandated.
What does the "-E3/61" suffix indicate in SMAJ45A-E3/61?
The "-E3" suffix denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads, while "/61" specifies packaging in 7-inch diameter plastic tape and reel containing 1800 units. This ordering code aligns with Vishay's standard delivery format for high-volume SMT assembly and ensures compatibility with industry-standard pick-and-place equipment feeders.
How does the SMAJ45A-E3/61 compare to bidirectional TVS diodes like SMAJ45CA?
The SMAJ45A-E3/61 is unidirectional and intended for DC line protection with defined polarity (cathode to positive rail), whereas SMAJ45CA is bidirectional and suited for AC or floating signal lines. SMAJ45A-E3/61 offers lower leakage (<1.0 μA) and tighter VBR tolerance in one direction, but cannot protect symmetrically-using SMAJ45A-E3/61 in place of SMAJ45CA requires verifying circuit polarity and grounding topology to avoid unintended conduction.
What PCB layout considerations are critical for optimal performance of the SMAJ45A-E3/61?
Optimal performance of the SMAJ45A-E3/61 requires mounting on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 400 W pulse power dissipation. Short, low-inductance traces to ground or protected node are essential-long traces increase clamping voltage due to parasitic inductance. Thermal relief patterns should be minimized to maintain thermal conductivity, and the SMAJ45A-E3/61 must be placed as close as possible to the connector or entry point being protected.
SMAJ45A-E3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ45A-E3/61 FAQ
1.How can I place an order for SMAJ45A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45A-E3/61 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 SMAJ45A-E3/61 reliable?
The price and inventory of SMAJ45A-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ45A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ45A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45A-E3/61?
SMAJ45A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45A-E3/61 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 SMAJ45A-E3/61?
For technical support, including SMAJ45A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45A-E3/61 requirements.
6.How does Aetrix verify that SMAJ45A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ45A-E3/61 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 SMAJ45A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ45A-E3/61?
All SMAJ45A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45A-E3/61, 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 SMAJ45A-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ45A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ45A-E3/61 Tags
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