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Vishay General Semiconductor - Diodes Division SMAJ43CAHE3_A/I
- Part No.:
- SMAJ43CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43CAHE3_A/I.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,543
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Product details
Overview
SMAJ43CAHE3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal and power lines. It features 43 V standoff voltage (VWM), 69.4 V maximum clamping voltage (VC) at 5.8 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial electronics.
For engineers reviewing the SMAJ43CAHE3_A/I datasheet, SMAJ43CAHE3_A/I pinout, SMAJ43CAHE3_A/I application, or SMAJ43CAHE3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low thermal resistance (RθJL = 30 °C/W), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) specified at 47.8–52.8 V (min/max) under 1 mA test current. Its clamping response is optimized for fast transients induced by inductive switching or ESD, achieving sub-nanosecond turn-on with low incremental surge resistance.
The device is rated for repetitive 0.01% duty cycle pulses and derates linearly above 25 °C ambient per Fig. 2; junction temperature is limited to 150 °C, and thermal resistance from junction-to-lead is 30 °C/W - enabling reliable operation without forced cooling in typical PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 47.8 V / 52.8 V at IT = 1 mA - ensures predictable breakdown onset within tight tolerance |
| VC @ IPPM | 69.4 V at 5.8 A - limits downstream voltage stress during 10/1000 μs surge events |
| PPPM | 400 W - peak pulse power handling with standard 10/1000 μs waveform |
| IFSM | 40 A - single half-sine surge current rating (unidirectional only; not applicable here due to bidirectional configuration) |
| TJ max. | 150 °C - maximum junction temperature supports under-hood automotive use |
| RθJL | 30 °C/W - low junction-to-lead thermal resistance enables effective heat transfer to PCB copper |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Molding compound meets UL 94 V-0; matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive polarity) | One terminal of symmetrical PN junction; accepts surge current in either direction |
| Cathode | Transient current exit (negative polarity) | Second terminal of symmetrical PN junction; completes bidirectional conduction path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22 standards |
| 400 W peak pulse power | Handles high-energy transients common in 12 V/24 V vehicle systems without degradation over rated lifetime |
| Low clamping ratio (VC/VWM ≈ 1.61) | Minimizes overvoltage exposure to protected ICs while maintaining margin above system operating voltage |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free SMT reflow profiles without preconditioning or special handling |
| Glass passivated junction | Enhances long-term stability and moisture resistance in harsh environments such as engine control units |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins from load dump and alternator ripple in passenger vehicles. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between power rail and ground, responding within <1 ns to transients exceeding 43 V. Use Value: Prevents latch-up or permanent damage to 5 V/3.3 V logic circuits during ISO 7637-2 Pulse 5a events up to 400 W. | Use Scenario: Shielding analog front-end inputs of pressure/temperature sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF at VWM) shunt protector across differential signal pairs exposed to ESD and relay coil flyback. Use Value: Maintains signal integrity below 1 MHz while limiting transient overshoot to ≤69.4 V during 8 kV contact ESD per IEC 61000-4-2. |
| Consumer Device USB Port Protection | Telecom Base Station DC Feed Protection |
Use Scenario: Safeguarding USB 2.0 data lines and VBUS against ESD and hot-plug surges in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Bidirectional TVS placed directly at connector, leveraging symmetry to protect both D+ and D− without polarity concerns. Use Value: Clamps 15 kV air discharge transients to safe levels while adding <0.5 pF parasitic capacitance per line - preserving signal rise time. | Use Scenario: Guarding remote radio head (RRH) DC power input against lightning-induced surges entering via outdoor cabling. IC Role / Device Role / Timing Role: Primary-stage crowbar device on 48 V DC feed line, coordinated with upstream MOVs and downstream DC-DC converters. Use Value: Absorbs up to 400 W single-event surge energy without failure, enabling compliance with ITU-T K.21 basic protection level. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43CA-M3 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification | No functional difference; selected where halogen-free material compliance is mandated | Choose SMAJ43CA-M3 when environmental compliance requires absence of brominated flame retardants |
| SMBJ43CAHE3_A/I | Same VWM/VC ratings but in SMB (DO-214AA) package - 20% larger footprint, higher PPPM (600 W) | Better suited for higher-energy surge environments where board space allows larger package | Select SMBJ43CAHE3_A/I if system-level surge testing exceeds 400 W or thermal margin is constrained |
Compared with SMAJ43CAHE3_A/I, SMAJ43CA-M3 offers identical protection performance with halogen-free construction, while SMBJ43CAHE3_A/I provides higher pulse power headroom in a physically larger package - enabling trade-offs between board area, energy handling, and material compliance.
Availability
SMAJ43CAHE3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, consumer USB interfaces, and telecom DC power feeds requiring stable component supply and AEC-Q101 assurance.
Supply support for SMAJ43CAHE3_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, TVS devices, and optoelectronics with emphasis on reliability and application-specific optimization.
The SMAJ series was developed to deliver robust, surface-mount transient suppression for automotive and industrial applications where space, thermal performance, and qualification rigor are critical - especially for 12 V/24 V systems subject to ISO 7637-2 and IEC 61000-4-x stressors.
FAQ
What does the "CA" suffix indicate in SMAJ43CAHE3_A/I?
The "CA" suffix in SMAJ43CAHE3_A/I denotes a bidirectional configuration - meaning the device clamps voltage transients equally in both polarities, unlike unidirectional "A" variants that conduct only in reverse bias. This makes SMAJ43CAHE3_A/I ideal for AC-coupled or floating signal lines where polarity reversal may occur during fault conditions.
Is SMAJ43CAHE3_A/I qualified for automotive use?
Yes, SMAJ43CAHE3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code structure ("HE3" suffix) and documentation referencing compliance per JESD22 standards. This qualification covers temperature cycling, highly accelerated life testing, and ESD robustness - making SMAJ43CAHE3_A/I suitable for engine control, body electronics, and ADAS subsystems.
What is the clamping voltage of SMAJ43CAHE3_A/I at its rated peak pulse current?
The clamping voltage (VC) of SMAJ43CAHE3_A/I is 69.4 V at 5.8 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the maximum voltage seen by downstream circuitry during a defined surge event - critical for ensuring protected ICs remain within absolute maximum ratings.
How does the thermal performance of SMAJ43CAHE3_A/I compare to similar TVS diodes?
SMAJ43CAHE3_A/I has a junction-to-lead thermal resistance (RθJL) of 30 °C/W, significantly lower than typical RθJA values (120 °C/W), indicating efficient heat transfer to PCB copper pads. When mounted on 0.2" × 0.2" copper pads per Vishay's recommendation, SMAJ43CAHE3_A/I sustains repeated surges without thermal runaway - outperforming many competing SMA-packaged TVS devices in sustained pulse scenarios.
Can SMAJ43CAHE3_A/I be used in place of a unidirectional TVS like SMAJ43AHE3_A/I?
No - SMAJ43CAHE3_A/I is bidirectional and lacks polarity marking, whereas SMAJ43AHE3_A/I is unidirectional with cathode band identification and forward conduction capability. Substituting SMAJ43CAHE3_A/I for SMAJ43AHE3_A/I in DC-biased circuits may cause unintended conduction or failed clamping; always verify circuit topology and bias conditions before replacement.
SMAJ43CAHE3_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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 5.8A
- 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)
SMAJ43CAHE3_A/I FAQ
1.How can I place an order for SMAJ43CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43CAHE3_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 SMAJ43CAHE3_A/I reliable?
The price and inventory of SMAJ43CAHE3_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 SMAJ43CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ43CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43CAHE3_A/I?
SMAJ43CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43CAHE3_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 SMAJ43CAHE3_A/I?
For technical support, including SMAJ43CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43CAHE3_A/I requirements.
6.How does Aetrix verify that SMAJ43CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ43CAHE3_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 SMAJ43CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ43CAHE3_A/I?
All SMAJ43CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43CAHE3_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 SMAJ43CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ43CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ43CAHE3_A/I Tags
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