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Vishay General Semiconductor - Diodes Division SMAJ43AHE3_A/I
- Part No.:
- SMAJ43AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43AHE3_A/I.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,447
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Product details
Overview
SMAJ43AHE3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 43 V stand-off voltage (VWM), 47.8–52.8 V breakdown range at 1 mA, 69.4 V maximum clamping voltage at 5.8 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - ideal for safeguarding MOSFETs, ICs, and sensor signal lines against inductive switching transients in automotive and industrial control systems.
For engineers reviewing the SMAJ43AHE3_A/I datasheet, SMAJ43AHE3_A/I pinout, SMAJ43AHE3_A/I application, or SMAJ43AHE3_A/I equivalent, key selection criteria include its AEC-Q101 qualification, low incremental surge resistance, fast response time, and compatibility with automated SMT placement on standard PCB layouts using 0.2" × 0.2" copper pads per terminal.
Technical Context
This TVS diode operates as a unidirectional clamping device, leveraging an avalanche breakdown mechanism to limit transient voltages before they damage downstream circuitry. Its glass-passivated junction ensures stable performance under repetitive surge conditions, while the SMA package supports thermal dissipation up to 3.3 W at 50 °C ambient with RθJA = 120 °C/W.
The device is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and exhibits a positive temperature coefficient of VBR (+0.102 %/°C), enabling predictable voltage margining across temperature extremes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse working voltage before leakage exceeds 1 μA; defines safe operating ceiling for DC bias applications. |
| VBR min/max | 47.8 V / 52.8 V at 1 mA - Confirmed breakdown threshold range; ensures reliable triggering above system operating voltage with margin. |
| VC @ IPPM | 69.4 V at 5.8 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on protected IC or MOSFET. |
| PPPM | 400 W - Peak pulse power handling capability; validates suitability for high-energy transients like ISO 7637-2 Pulse 1/2a in automotive ECUs. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports robustness against accidental polarity reversals or latch-up events. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments without derating below 125 °C ambient. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band marking; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VWM exceeded - must be routed with low-inductance path to minimize clamping overshoot. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return plane; establishes reference for clamping action and defines unidirectional polarity. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - required for ECU, ADAS, and body control module designs. |
| 400 W peak pulse power | Handles high-energy transients such as load dump (ISO 16750-2) and inductive kickback without degradation - eliminates need for external series impedance in many 12 V/24 V systems. |
| Low clamping ratio (VC/VWM ≈ 1.61) | Minimizes overvoltage stress on protected devices - critical for safeguarding 48 V tolerant interfaces and low-voltage logic inputs. |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without dry-pack or baking - reduces manufacturing cost and avoids moisture-induced popcorning during assembly. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply rails in junction boxes and fuse panels from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between battery input and DC-DC converter input stage. Use Value: Limits transient voltage to ≤69.4 V during ISO 16750-2 Test 4a (load dump), preventing damage to downstream PMICs and microcontrollers. | Use Scenario: Shielding analog output lines of pressure/temperature sensors in PLC I/O modules from field wiring surges. IC Role / Device Role / Timing Role: Point-of-entry TVS on 4–20 mA current loop or 0–10 V analog output traces. Use Value: Clamps induced transients to <70 V within nanoseconds, preserving ADC accuracy and avoiding latch-up in op-amp driver stages. |
| Consumer Appliance Motor Control | Telecom Power Supply Input Stage |
Use Scenario: Guarding gate drivers and bootstrap circuits in BLDC motor inverters inside washing machines and HVAC systems. IC Role / Device Role / Timing Role: TVS placed across high-side MOSFET source-to-drain or gate-to-source to suppress shoot-through spikes. Use Value: Withstands 40 A single-pulse surge (IFSM), enabling robust operation during motor stall or short-circuit faults without failure. | Use Scenario: Front-end protection of AC/DC adapters and PoE injectors against lightning-induced surges on primary-side rectifier outputs. IC Role / Device Role / Timing Role: Secondary-side unidirectional TVS on bulk capacitor rail feeding isolated DC-DC controller. Use Value: 400 W pulse rating handles EN 61000-4-5 Level 3 (1 kV/2 kA) surges, maintaining regulation integrity during telecom base station power interruptions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A-E3/61 | Same electrical specs and SMA package; RoHS-compliant commercial grade without AEC-Q101 qualification. | Lacks automotive qualification; suitable for consumer/industrial use where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive reliability requirements and no vehicle-level validation is needed. |
| SMBJ43AHE3_A/I | Identical VWM, VBR, and VC; higher PPPM (600 W) due to SMB (DO-214AA) package with larger thermal mass. | Better surge energy handling but requires larger PCB footprint; not drop-in compatible due to different pad layout. | Choose when system-level surge testing exceeds 400 W or when longer transient duration (e.g., ISO 7637-2 Pulse 5a) demands higher energy absorption. |
Compared with SMAJ43A-E3/61, SMAJ43AHE3_A/I adds AEC-Q101 qualification for automotive use; compared with SMBJ43AHE3_A/I, it trades 200 W pulse power for smaller SMA footprint and lower board space cost - making it optimal for space-constrained ECU nodes requiring certified reliability.
Availability
SMAJ43AHE3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor signal conditioning, and consumer appliance motor drive circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ43AHE3_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, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ESD, EFT, and surge events is mission-critical.
FAQ
What is the clamping voltage of SMAJ43AHE3_A/I at its rated peak pulse current?
The SMAJ43AHE3_A/I has a maximum clamping voltage (VC) of 69.4 V at its specified peak pulse current (IPPM) of 5.8 A, measured under the standard 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is confirmed in the Vishay datasheet Document Number 88390, page 2. The SMAJ43AHE3_A/I maintains this clamping performance across its full operating temperature range.
Is SMAJ43AHE3_A/I suitable for automotive applications?
Yes, SMAJ43AHE3_A/I is AEC-Q101 qualified, as indicated by the "HE3" suffix and confirmed in the Vishay ordering information table (page 3). It meets automotive reliability requirements including temperature cycling, mechanical shock, and humidity testing - making it appropriate for engine control modules, body electronics, and ADAS subsystems. The SMAJ43AHE3_A/I is explicitly designated for automotive use in Vishay's documentation.
What does the "_A/I" suffix mean in SMAJ43AHE3_A/I?
The "_A/I" suffix in SMAJ43AHE3_A/I denotes the revision code ("A") and packaging format ("I" = 13-inch tape-and-reel, 7500 units per reel), per Vishay's ordering information on page 3. The "HE3" portion confirms RoHS-compliant and AEC-Q101 qualified construction. This full ordering code ensures traceability to Vishay's qualified manufacturing lot and reflow profile compliance.
How does SMAJ43AHE3_A/I differ from bidirectional SMAJ43CA variants?
The SMAJ43AHE3_A/I is unidirectional, with cathode marked by a band and intended for DC-biased lines where polarity is fixed; SMAJ43CA is bidirectional, with no polarity marking and symmetrical clamping in both directions. Their VWM (43 V), VBR, and VC values differ slightly due to internal structure - SMAJ43AHE3_A/I has VBR = 47.8–52.8 V, while SMAJ43CA has VBR = 47.8–52.8 V in each direction. The SMAJ43AHE3_A/I cannot replace SMAJ43CA in AC-coupled or floating signal paths.
What is the thermal resistance of SMAJ43AHE3_A/I, and how does it affect PCB layout?
The SMAJ43AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads per terminal. To maintain safe junction temperatures under sustained power dissipation, designers must ensure adequate copper area and avoid thermal isolation. The SMAJ43AHE3_A/I's RθJL of 30 °C/W also indicates efficient heat conduction through leads - reinforcing the need for solid thermal vias and wide traces connected to ground planes.
SMAJ43AHE3_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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ43AHE3_A/I FAQ
1.How can I place an order for SMAJ43AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43AHE3_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 SMAJ43AHE3_A/I reliable?
The price and inventory of SMAJ43AHE3_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 SMAJ43AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ43AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43AHE3_A/I?
SMAJ43AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43AHE3_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 SMAJ43AHE3_A/I?
For technical support, including SMAJ43AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43AHE3_A/I requirements.
6.How does Aetrix verify that SMAJ43AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ43AHE3_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 SMAJ43AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ43AHE3_A/I?
All SMAJ43AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43AHE3_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 SMAJ43AHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ43AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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