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Vishay General Semiconductor - Diodes Division SMAJ43CAHE3/5A
- Part No.:
- SMAJ43CAHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43CAHE3/5A.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,583
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Product details
Overview
SMAJ43CAHE3/5A 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 signal or power lines. It features a 43 V stand-off voltage (VWM), 47.8–52.8 V breakdown voltage (VBR) at 1 mA, 69.4 V maximum clamping voltage (VC) at 5.8 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial control systems.
For engineers reviewing the SMAJ43CAHE3/5A datasheet, SMAJ43CAHE3/5A pinout, SMAJ43CAHE3/5A application, or SMAJ43CAHE3/5A 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 placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamping protector with symmetrical avalanche breakdown in both directions, enabling use without polarity consideration on AC or differential signal paths. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<1.0 μA at VWM), while the 30 °C/W junction-to-lead thermal resistance supports reliable surge energy dissipation under repetitive transient conditions.
The SMAJ43CAHE3/5A delivers 400 W peak pulse power up to 78 V and derates to 300 W above that threshold, per Fig. 2 of the datasheet. Its fast response time (<1.0 ps) and low incremental surge resistance enable effective suppression of ESD, lightning-induced surges, and inductive switching spikes in automotive CAN/LIN bus interfaces and industrial I/O modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin for 36–48 V nominal systems. |
| VBR min/max | 47.8 V / 52.8 V at 1 mA - Tight 5% tolerance ensures predictable turn-on across temperature and production lots. |
| VC @ IPPM | 69.4 V at 5.8 A - Clamping voltage during 10/1000 μs surge; limits downstream voltage stress to <70 V. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak transient energy handling capacity with standard test waveform. |
| ID @ VWM | ≤1.0 μA - Ultra-low leakage preserves signal integrity and battery life in always-on circuits. |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and high-ambient industrial enclosures. |
| MSL Level | Level 1 (J-STD-020) - Supports lead-free reflow without baking; compatible with standard SMT assembly lines. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); matte tin-plated leads, solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | One terminal of symmetrical PN junction; accepts surge current from either direction during overvoltage events. |
| Cathode | Transient current entry (bidirectional) | Second terminal of symmetrical junction; completes low-impedance path to ground or rail during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
| 400 W peak pulse power | Handles ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 surge events without degradation when mounted per recommended pad layout. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during fast transients, reducing risk of latch-up or gate oxide damage in protected ICs. |
| MSL Level 1, 260 °C peak reflow | Eliminates pre-bake requirement and enables direct placement into high-volume lead-free SMT lines. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage parameters under thermal cycling and humidity exposure. |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Protecting 12 V/24 V power rails in vehicle infotainment head units against load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between power input and local DC/DC converter input. Use Value: Limits transient excursions to ≤69.4 V, preventing damage to 40 V-rated input capacitors and PMICs. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Low-capacitance TVS placed across signal and return lines at connector interface. Use Value: Sub-1.0 μA leakage avoids loading the precision current source; clamps ESD events to <70 V without affecting loop accuracy. |
| Telecom Interface Surge Protection | Consumer Device USB Port ESD Guard |
|
Use Scenario: Safeguarding RS-485 transceivers in base station backhaul equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS connected line-to-line and line-to-ground on differential bus pairs. Use Value: Withstands 400 W surges per IEC 61000-4-5 Level 3, maintaining signal integrity through 10/1000 μs transients. |
Use Scenario: ESD protection for USB 2.0 D+/D− lines in portable medical monitors and smart home hubs. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at USB connector pins. Use Value: Clamps ±15 kV contact discharge (IEC 61000-4-2) without distorting 480 Mbps data eye due to minimal parasitic capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43CA-M3/5A | Same electrical specs; halogen-free, RoHS-compliant, commercial-grade (non-AEC-Q101). | Lacks automotive qualification; suitable for industrial/commercial designs not requiring AEC validation. | Select when cost sensitivity outweighs automotive compliance requirements and lifecycle assurance. |
| SMBJ43CAHE3/5A | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package; higher 600 W PPPM rating. | Better thermal performance and surge margin; requires larger PCB footprint and different pad layout. | Choose when system-level surge testing exceeds 400 W or board space allows SMB footprint. |
Compared with SMAJ43CAHE3/5A, the M3 variant trades AEC-Q101 qualification for halogen-free compliance and lower cost, while the SMBJ43CAHE3/5A offers higher surge robustness at the expense of board area - making SMAJ43CAHE3/5A optimal for space-constrained, automotive-grade 43 V rail protection.
Availability
SMAJ43CAHE3/5A is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC I/O modules, telecom interface cards, and consumer USB peripheral protection requiring stable component supply and AEC-Q101 traceability.
Supply support for SMAJ43CAHE3/5A 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, efficiency, and automotive-grade qualification.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive power distribution, industrial control inputs, and communication interface protection where AEC-Q101 compliance and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of SMAJ43CAHE3/5A at its rated peak pulse current?
The SMAJ43CAHE3/5A has a maximum clamping voltage (VC) of 69.4 V at 5.8 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per Figure 1 and Table 1 of Vishay Document 88390 and defines the upper voltage limit imposed on protected circuitry during surge events. The clamping performance remains stable across -55 °C to +150 °C operating junction temperature.
Is SMAJ43CAHE3/5A suitable for automotive applications?
Yes, SMAJ43CAHE3/5A is AEC-Q101 qualified (as indicated by the "HE3" suffix), making it suitable for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. It meets stringent requirements for temperature cycling, humidity resistance, and surge robustness defined in the AEC-Q101 standard, and is rated for operation from -55 °C to +150 °C junction temperature.
What does the "CA" suffix mean in SMAJ43CAHE3/5A?
The "CA" suffix in SMAJ43CAHE3/5A denotes a bidirectional configuration - meaning the device provides symmetrical transient voltage suppression in both polarities, with identical breakdown and clamping characteristics in forward and reverse directions. This eliminates polarity concerns during PCB layout and simplifies design for AC-coupled or differential signal lines such as RS-485, CAN, or audio interfaces.
How does the thermal performance of SMAJ43CAHE3/5A affect its surge handling capability?
SMAJ43CAHE3/5A has a typical junction-to-lead thermal resistance (RθJL) of 30 °C/W, enabling efficient heat transfer from the silicon die to the PCB copper pads during transient events. When mounted on the recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, it sustains its full 400 W peak pulse power rating; reduced pad area or elevated ambient temperature will require derating per Figure 2 in the datasheet.
What packaging options are available for SMAJ43CAHE3/5A?
SMAJ43CAHE3/5A is supplied in 13" diameter plastic tape and reel format with a base quantity of 7500 units (package code "5A"). The "HE3" suffix confirms RoHS-compliance and AEC-Q101 qualification. Tape-and-reel packaging supports automated SMT placement, and the device meets JESD 201 Class 2 whisker resistance and J-STD-020 MSL Level 1 reflow specifications.
SMAJ43CAHE3/5A 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):
- 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)
SMAJ43CAHE3/5A FAQ
1.How can I place an order for SMAJ43CAHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43CAHE3/5A 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 SMAJ43CAHE3/5A reliable?
The price and inventory of SMAJ43CAHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ43CAHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ43CAHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43CAHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43CAHE3/5A?
SMAJ43CAHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43CAHE3/5A 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 SMAJ43CAHE3/5A?
For technical support, including SMAJ43CAHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43CAHE3/5A requirements.
6.How does Aetrix verify that SMAJ43CAHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ43CAHE3/5A 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 SMAJ43CAHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ43CAHE3/5A?
All SMAJ43CAHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43CAHE3/5A, 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 SMAJ43CAHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ43CAHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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