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Vishay General Semiconductor - Diodes Division SMAJ45CAHE3/5A
- Part No.:
- SMAJ45CAHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45CAHE3/5A.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,820
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Product details
Overview
SMAJ45CAHE3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection on signal and power 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, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMAJ45CAHE3/5A datasheet, SMAJ45CAHE3/5A pinout, SMAJ45CAHE3/5A application, or SMAJ45CAHE3/5A equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification, low incremental surge resistance, and compatibility with automated SMT assembly on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: under transient overvoltage events exceeding VWM = 45 V, it avalanches symmetrically in both directions to clamp the line at ≤72.7 V while diverting up to 5.5 A (10/1000 μs). Its glass-passivated junction ensures stable breakdown and fast response (<1 ns), with thermal resistance RθJA = 120 °C/W enabling operation from –55 °C to +150 °C.
The SMAJ45CAHE3/5A variant carries the HE3 suffix, confirming RoHS compliance and AEC-Q101 qualification per JESD22-B102 whisker testing and MSL Level 1 reflow profile (peak 260 °C). It exhibits a temperature coefficient of VBR = +0.102 %/°C and reverse leakage <1.0 μA at VWM, supporting low-power standby integrity in automotive ECUs and industrial controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe signal swing range. |
| VBR (min/max) | 50.0 V / 55.3 V at 1 mA - Confirmed bidirectional avalanche threshold; ensures symmetrical protection behavior. |
| VC @ IPPM | 72.7 V at 5.5 A - Clamped voltage during 10/1000 μs surge; determines protected circuit's maximum stress level. |
| PPPM | 400 W - Peak pulse power handling capability; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out. |
| IFSM | 40 A - Non-repetitive forward surge rating (8.3 ms half-sine); relevant for unidirectional variants only - not applicable here. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments without derating. |
| RθJA | 120 °C/W - Thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs board-level thermal design. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Bidirectional construction means no polarity marking; terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetric) | Transient current path | Both terminals serve identically as clamping nodes; no cathode band marking - enables orientation-agnostic PCB placement. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC in both directions - eliminates need for polarity-aware layout in AC-coupled or differential lines. |
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces per stress test requirements. |
| 400 W peak pulse power | Withstands 10/1000 μs surges up to 5.5 A - meets IEC 61000-4-5 surge immunity requirements for industrial and automotive ports. |
| Low clamping ratio (VC/VWM ≈ 1.62) | Minimizes overvoltage exposure to downstream ICs - critical for protecting 3.3 V or 5 V logic interfaces on microcontrollers and transceivers. |
| MSL Level 1 moisture sensitivity | Compatible with standard reflow profiles up to 260 °C peak - supports high-yield automated assembly without baking. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting LIN bus or analog sensor inputs (e.g., pressure, temperature) in engine control modules against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector entry point, clamping voltage before reaching MCU ADC or LIN transceiver. Use Value: Maintains signal integrity below 72.7 V during 400 W surges, preventing latch-up or permanent damage to AEC-Q100 qualified microcontrollers. |
Use Scenario: Safeguarding PLC digital input channels exposed to 24 V DC field wiring subject to relay coil flyback and ESD events. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input terminal block, working in concert with series current-limiting resistor and optocoupler isolation. Use Value: Limits transient overshoot to ≤72.7 V within nanoseconds, ensuring reliable optocoupler triggering and avoiding false state transitions. |
| Telecom Line Interface | Consumer USB Port ESD Protection |
|
Use Scenario: Shielding RS-485 transceivers in base station backhaul equipment from lightning-induced surges on long-distance twisted-pair lines. IC Role / Device Role / Timing Role: First-stage TVS on differential pair, absorbing bulk energy before secondary protection (e.g., polymer PTC + capacitor). Use Value: Symmetrical clamping preserves common-mode rejection ratio (CMRR) while limiting differential voltage excursion to <145 V peak. |
Use Scenario: Adding robustness to USB 2.0 data lines (D+/D−) in smart home hubs against contact ESD (±8 kV air, ±4 kV contact per IEC 61000-4-2). IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed adjacent to USB connector, minimizing signal distortion. Use Value: Sub-100 pF junction capacitance at VWM ensures <1% signal attenuation at 480 MHz, preserving USB 2.0 eye diagram integrity. |
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 | Same electrical specs and AEC-Q101 qualification; halogen-free molding compound instead of standard RoHS-compliant material. | Required where halogen-free compliance is mandated by OEM environmental specifications (e.g., EU auto Tier 1 programs). | Select when halogen-free certification is contractually required; otherwise SMAJ45CAHE3/5A offers identical performance and supply chain traceability. |
| SMBJ45CAHE3/5A | Same VWM, VBR, VC; higher PPPM = 600 W due to SMB (DO-214AA) package with larger thermal mass. | Preferred for higher-energy surge environments (e.g., 10/1000 μs >7 A) where PCB space allows larger footprint. | Choose SMBJ45CAHE3/5A only if surge current exceeds 5.5 A; SMAJ45CAHE3/5A remains optimal for space-constrained designs with ≤400 W needs. |
Compared with SMAJ45CA-M3/5A, SMAJ45CAHE3/5A provides identical protection performance with standard RoHS compliance; compared with SMBJ45CAHE3/5A, it trades 200 W pulse power headroom for 30% smaller PCB area and lower thermal mass - ideal for compact automotive modules and portable industrial sensors.
Availability
SMAJ45CAHE3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial digital I/O protection, telecom line interfaces, and consumer USB port ESD protection requiring stable component supply across production lifecycles.
Supply support for SMAJ45CAHE3/5A 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, automotive qualification, and high-volume manufacturability.
The SMAJ series delivers standardized, AEC-Q101-qualified TVS diodes for cost-sensitive yet mission-critical overvoltage protection in automotive, industrial, and communications systems - prioritizing fast response, repeatable clamping, and SMT process compatibility.
FAQ
What does the "CA" suffix indicate in SMAJ45CAHE3/5A?
The "CA" suffix denotes a bidirectional configuration: SMAJ45CAHE3/5A clamps symmetrically in both polarities, making it suitable for AC-coupled lines, differential buses, or any application where voltage transients may occur with either polarity. Unlike unidirectional "A" variants, it has no cathode marking and identical VBR and VC values in forward and reverse directions - a core feature confirmed in Vishay's datasheet revision 09-Jan-2024.
Is SMAJ45CAHE3/5A suitable for IEC 61000-4-5 surge testing?
Yes, SMAJ45CAHE3/5A is rated for 400 W peak pulse power with a 10/1000 μs waveform - sufficient to meet IEC 61000-4-5 Level 4 (4 kV line-to-earth, 2 kV line-to-line) when implemented with proper PCB layout (e.g., 5.0 mm × 5.0 mm copper pads per terminal). Its 72.7 V clamping voltage at 5.5 A ensures downstream ICs remain within safe operating limits during standardized surge events.
How does the HE3 suffix affect the qualification status of SMAJ45CAHE3/5A?
The HE3 suffix certifies that SMAJ45CAHE3/5A is RoHS-compliant and AEC-Q101 qualified - validated per JESD22-B102 whisker testing, MSL Level 1 reflow profile (260 °C peak), and full automotive stress screening. This distinguishes it from commercial-grade E3 variants and confirms suitability for under-hood and safety-critical automotive applications where reliability and long-term stability are mandatory.
What is the maximum operating temperature for SMAJ45CAHE3/5A?
SMAJ45CAHE3/5A has a specified operating junction temperature range of –55 °C to +150 °C. Its thermal resistance RθJA = 120 °C/W (on 0.2" × 0.2" copper pads) allows sustained operation at +125 °C ambient in typical automotive and industrial environments - provided power dissipation remains within its 3.3 W steady-state limit and surge duty cycle stays below 0.01 %.
Can SMAJ45CAHE3/5A be used in place of a unidirectional TVS like SMAJ45AHE3/5A?
No - SMAJ45CAHE3/5A is strictly bidirectional and lacks polarity marking, while SMAJ45AHE3/5A is unidirectional with a cathode band and asymmetric conduction. Substituting one for the other risks incorrect clamping behavior: SMAJ45CAHE3/5A will conduct on both half-cycles of an AC signal, whereas SMAJ45AHE3/5A blocks in reverse bias until breakdown. Always match device polarity to circuit topology - bidirectional for differential or AC lines, unidirectional for DC-biased rails.
SMAJ45CAHE3/5A 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)
SMAJ45CAHE3/5A FAQ
1.How can I place an order for SMAJ45CAHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45CAHE3/5A 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 SMAJ45CAHE3/5A reliable?
The price and inventory of SMAJ45CAHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ45CAHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ45CAHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45CAHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45CAHE3/5A?
SMAJ45CAHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45CAHE3/5A 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 SMAJ45CAHE3/5A?
For technical support, including SMAJ45CAHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45CAHE3/5A requirements.
6.How does Aetrix verify that SMAJ45CAHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ45CAHE3/5A 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 SMAJ45CAHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ45CAHE3/5A?
All SMAJ45CAHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45CAHE3/5A, 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 SMAJ45CAHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ45CAHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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