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Vishay General Semiconductor - Diodes Division SMAJ43AHM3/I
- Part No.:
- SMAJ43AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43AHM3/I.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,296
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Product details
Overview
SMAJ43AHM3/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of DC power rails and signal 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, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive infotainment power inputs and industrial sensor I/O interfaces.
For engineers reviewing the SMAJ43AHM3/I datasheet, SMAJ43AHM3/I pinout, SMAJ43AHM3/I application, or SMAJ43AHM3/I equivalent, key selection criteria include clamping performance under 5.8 A surge, thermal resistance (RθJA = 120 °C/W), AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, leveraging glass-passivated junction technology for stable reverse breakdown and fast response (<1 ns). Its low incremental surge resistance ensures minimal voltage overshoot during ESD or lightning-induced transients, while its MSL Level 1 rating supports lead-free reflow up to 260 °C.
The device is rated for continuous operation from –55 °C to +150 °C junction temperature, with 3.3 W steady-state power dissipation on infinite heatsink at 50 °C ambient. It meets UL 497B recognition (QVGQ2) and complies with ANSI/IEEE C62.35 surge test standards.
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 1 mA - guaranteed avalanche onset range for reliable turn-on margin |
| VC @ IPPM | 69.4 V at 5.8 A - clamped voltage during 10/1000 μs surge, limiting downstream stress |
| PPPM | 400 W - peak pulse power handling capability with standard lightning surge waveform |
| RθJA | 120 °C/W - thermal resistance from junction to ambient on recommended PCB pad layout |
| TJ max | +150 °C - maximum allowable junction temperature for sustained reliability |
| Package | SMA (DO-214AC) - surface-mount outline with cathode band marking, compatible with J-STD-002 soldering |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity indicated by cathode band on unidirectional types; meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes clamping loop during overvoltage events |
| Cathode | High-side connection point | Connected to protected line (e.g., 43 V rail); avalanche conduction occurs from cathode to anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification |
| Halogen-free & RoHS-compliant | HM3 suffix confirms halogen-free molding compound and full RoHS compliance for green manufacturing |
| 400 W peak pulse power | Withstands 10/1000 μs transients up to 5.8 A without degradation, suitable for ISO 7637-2 Pulse 1/2a/5a environments |
| Fast response time | <1 ns typical response enables protection of high-speed logic and analog circuits against ESD and EFT |
| MSL Level 1 | Rated for unlimited floor life and reflow up to 260 °C peak, eliminating bake requirements prior to assembly |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Clamp |
|---|---|
Use Scenario: Protecting 43 V supply rail of vehicle infotainment head unit against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between input rail and chassis ground to clamp surges above 43 V. Use Value: Limits transient voltage to ≤69.4 V at 5.8 A, preventing damage to downstream DC/DC converters and microcontrollers. | Use Scenario: Safeguarding analog output of pressure sensor in factory automation PLC module. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (cathode grounded) shunts induced noise on 4–20 mA loop. Use Value: Clamps fast-rising transients from relay switching or motor drive coupling, preserving 12-bit ADC accuracy. |
| Telecom DC Power Interface | Consumer Appliance Motor Drive Protection |
Use Scenario: Shielding PoE-powered network switch port from Ethernet cable ESD and surge coupling. IC Role / Device Role / Timing Role: TVS mounted on DC input side of isolated DC/DC converter feeding PHY ICs. Use Value: Absorbs 400 W surges without latch-up, maintaining IEEE 802.3af/at compliance and system uptime. | Use Scenario: Guarding microcontroller GPIOs driving brushed DC motors in smart home vacuum cleaners. IC Role / Device Role / Timing Role: Local clamping element across motor coil terminals and MCU driver outputs. Use Value: Suppresses inductive kickback spikes up to 69.4 V, avoiding false resets and gate oxide damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43AHE3/I | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs HM3) | Lacks halogen-free certification; acceptable for commercial but not automotive Tier 1 sourcing | Select when halogen-free requirement is waived and cost optimization is prioritized |
| SMAJ43A-M3/5A | Same electrical specs; HM3-equivalent halogen-free RoHS part, but packaged in 13" reel (5A) vs 7" (I) | Different packaging format affects SMT line feed setup and minimum order quantity | Select when production volume justifies 7500-unit reels and tape-and-reel logistics align |
Compared with SMAJ43AHM3/I, SMAJ43AHE3/I omits halogen-free assurance critical for automotive OEMs, while SMAJ43A-M3/5A offers identical performance in higher-volume packaging - both require no circuit redesign but differ in compliance scope and procurement planning.
Availability
SMAJ43AHM3/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor modules, telecom power interfaces, and consumer appliance motor control systems requiring stable component supply with AEC-Q101 validation and halogen-free compliance.
Supply support for SMAJ43AHM3/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific validation.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ISO 7637, IEC 61000-4-2/4/5, and lightning-induced surges is mandatory.
FAQ
What is the clamping voltage of SMAJ43AHM3/I at its rated peak pulse current?
The SMAJ43AHM3/I 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 ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ43AHM3/I maintains this clamping performance across its qualified operating temperature range.
Is SMAJ43AHM3/I qualified for automotive use?
Yes, SMAJ43AHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3_X" (where "X" denotes revision A, B, etc.). This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and ESD, making SMAJ43AHM3/I suitable for automotive powertrain, body electronics, and infotainment systems per Tier 1 supplier requirements.
What does the "HM3" suffix mean in SMAJ43AHM3/I?
The "HM3" suffix in SMAJ43AHM3/I indicates halogen-free, RoHS-compliant construction with matte tin-plated leads meeting J-STD-002 solderability and JESD201 Class 2 whisker resistance. It distinguishes the part from E3 (RoHS only) and HE3/HM3 variants with AEC-Q101 qualification - confirming both environmental compliance and automotive-grade reliability for SMAJ43AHM3/I.
Can SMAJ43AHM3/I be used in bidirectional protection circuits?
No, SMAJ43AHM3/I is a unidirectional TVS diode, identified by the "A" (not "CA") suffix and cathode band marking. For bidirectional operation, Vishay specifies parts like SMAJ43CA. Using SMAJ43AHM3/I in reverse-biased configurations risks permanent failure due to forward conduction beyond its 3.5 V VF rating at 25 A - SMAJ43AHM3/I must be oriented with cathode toward the protected line.
What PCB pad layout is required to achieve the rated 400 W peak pulse power for SMAJ43AHM3/I?
To achieve the full 400 W peak pulse power rating, SMAJ43AHM3/I must be mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in Vishay Document 88390. Smaller pads reduce thermal dissipation and derate PPPM - for example, using 0.1" pads may limit sustainable surge energy by >30%. The SMAJ43AHM3/I datasheet provides exact dimensional drawings for DO-214AC land patterns.
SMAJ43AHM3/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:
- Discontinued at Digi-Key
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ43AHM3/I FAQ
1.How can I place an order for SMAJ43AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43AHM3/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 SMAJ43AHM3/I reliable?
The price and inventory of SMAJ43AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ43AHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ43AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43AHM3/I?
SMAJ43AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43AHM3/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 SMAJ43AHM3/I?
For technical support, including SMAJ43AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43AHM3/I requirements.
6.How does Aetrix verify that SMAJ43AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ43AHM3/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 SMAJ43AHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ43AHM3/I?
All SMAJ43AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43AHM3/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 SMAJ43AHM3/I part is unused and in its original packaging.
Return procedure for SMAJ43AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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