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Vishay General Semiconductor - Diodes Division SMAJ43CAHM3_A/I
- Part No.:
- SMAJ43CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43CAHM3_A/I.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,952
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Product details
Overview
SMAJ43CAHM3_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 (IPPM), and 400 W peak pulse power (10/1000 μs waveform), targeting protection of MOSFETs, ICs, and sensor interfaces in automotive and industrial systems.
For engineers reviewing the SMAJ43CAHM3_A/I datasheet, SMAJ43CAHM3_A/I pinout, SMAJ43CAHM3_A/I application, or SMAJ43CAHM3_A/I equivalent, key selection criteria include bidirectional surge capability, AEC-Q101 qualification, halogen-free RoHS compliance, and compatibility with 0.2" × 0.2" copper pad layouts per JEDEC standard.
Technical Context
This device operates as a voltage-clamping protector with symmetrical breakdown behavior in both directions due to its bidirectional construction. Its glass-passivated junction enables fast response (<1 ps) to ESD and lightning-induced transients, while low incremental surge resistance ensures stable clamping under repetitive 0.01% duty cycle surges.
The SMAJ43CAHM3_A/I is rated for -55 °C to +150 °C operating junction temperature, exhibits 0.102 %/°C temperature coefficient of VBR, and meets MSL Level 1 per J-STD-020 with peak reflow temperature of 260 °C - confirming suitability for lead-free SMT assembly without moisture sensitivity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse working voltage before clamping begins |
| VBR min/max | 47.8 V / 52.8 V at 1 mA - Confirmed breakdown threshold range for reliable turn-on margin |
| VC @ IPPM | 69.4 V at 5.8 A - Clamped voltage during 10/1000 μs surge, limiting stress on downstream components |
| PPPM | 400 W - Peak pulse power handling capacity under standardized transient waveform |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms), supporting inductive load switching events |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker test requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Either terminal accepts surge current; symmetric conduction eliminates orientation dependency during PCB layout |
| Cathode | Transient current exit (bidirectional) | Same physical terminal as Anode; no cathode band marking confirms bidirectional functionality |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and JEDEC JS709E requirements for green electronics manufacturing |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV line-to-line) without degradation when mounted on 5 mm × 5 mm pads |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage exposure to protected ICs compared to higher-ratio TVS devices |
| MSL Level 1 rating | Enables direct placement into reflow ovens without baking, reducing production overhead and moisture-related defects |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator transients up to ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Voltage-clamping protector placed across power input rails upstream of DC/DC converters and microcontrollers. Use Value: Limits transient voltage to ≤69.4 V, preventing latch-up or gate oxide damage in 3.3 V/5 V logic and power management ICs. | Use Scenario: Safeguarding analog front-ends of pressure, temperature, and position sensors connected to CAN or LIN buses. IC Role / Device Role / Timing Role: Bidirectional shunt element absorbing ±15 kV ESD (IEC 61000-4-2) and 1 kV ring wave surges on differential signal pairs. Use Value: Maintains signal integrity by clamping transients within 1 ns, avoiding false triggering or ADC offset drift in precision measurement circuits. |
| Consumer USB Port Protection | Telecom DSL Line Protection |
Use Scenario: Shielding USB 2.0 data lines (D+/D−) and VBUS from ESD events during hot-plug insertion. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed directly at connector pins to minimize stub length. Use Value: Junction capacitance <100 pF at 0 V ensures <0.1 dB insertion loss at 480 MHz, preserving USB 2.0 eye diagram integrity. | Use Scenario: Guarding ADSL/VDSL line drivers and receivers against lightning-induced surges on twisted-pair telephone lines. IC Role / Device Role / Timing Role: Primary surge suppression stage before gas discharge tube (GDT) secondary protection in hybrid protection modules. Use Value: Withstands repeated 10/1000 μs surges up to 400 W, extending service life of telecom infrastructure equipment in high-lightning regions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43CAHE3_A/I | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification | Preferred for commercial automotive modules where halogen content is unrestricted | Select when cost optimization is prioritized over halogen-free material compliance |
| SMBJ43CAHM3_A/I | Same VWM/VC but 600 W PPPM; larger SMB (DO-214AA) package (5.28 mm × 4.57 mm) | Better suited for higher-energy surge environments (e.g., 24 V industrial PLCs) | Choose when system-level surge testing exceeds 400 W and board space allows larger footprint |
Compared with SMAJ43CAHE3_A/I, the SMAJ43CAHM3_A/I adds halogen-free compliance without sacrificing AEC-Q101 qualification or clamping performance; versus SMBJ43CAHM3_A/I, it trades 200 W pulse power headroom for 30% smaller PCB area and identical thermal resistance (RθJL = 30 °C/W).
Availability
SMAJ43CAHM3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom infrastructure requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ43CAHM3_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 validation.
The SMAJ series was engineered for robust transient suppression in harsh environments - particularly automotive and industrial applications where AEC-Q101 qualification, thermal stability, and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of SMAJ43CAHM3_A/I at its rated peak pulse current?
The SMAJ43CAHM3_A/I has a maximum clamping voltage (VC) of 69.4 V at 5.8 A peak pulse current (IPPM) under a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ43CAHM3_A/I maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C) with minimal derating.
Is SMAJ43CAHM3_A/I suitable for automotive applications?
Yes, SMAJ43CAHM3_A/I is AEC-Q101 qualified and specifically designed for automotive use. Its construction includes glass-passivated junctions, MSL Level 1 moisture sensitivity rating, and guaranteed operation from -55 °C to +150 °C - meeting requirements for engine control units, body electronics, and ADAS sensor modules. The "HM3" suffix confirms halogen-free and RoHS-compliant materials required by Tier 1 automotive suppliers.
How does the bidirectional design of SMAJ43CAHM3_A/I affect PCB layout?
The bidirectional design of SMAJ43CAHM3_A/I eliminates polarity constraints during placement: either terminal may connect to the line or ground side of the protected node. No cathode band marking is present, simplifying automated optical inspection and reducing risk of misorientation. This symmetry also supports differential protection schemes (e.g., RS-485, CAN) without requiring matched unidirectional pairs.
What is the thermal resistance of SMAJ43CAHM3_A/I, and how does it impact power dissipation?
SMAJ43CAHM3_A/I has a typical junction-to-lead thermal resistance (RθJL) of 30 °C/W and junction-to-ambient (RθJA) of 120 °C/W. When mounted on 0.2" × 0.2" copper pads, it sustains 3.3 W continuous power dissipation at 50 °C ambient. For transient events, the low RθJL enables rapid heat transfer to PCB copper, preventing localized overheating during repetitive 400 W surges at 0.01% duty cycle.
Does SMAJ43CAHM3_A/I require special handling or baking before SMT assembly?
No, SMAJ43CAHM3_A/I is rated MSL Level 1 per J-STD-020, meaning it may be stored indefinitely at ambient conditions and placed directly into reflow ovens without pre-baking. Its maximum peak reflow temperature is 260 °C, fully compatible with lead-free SAC305 profiles. The matte tin-plated leads ensure solderability per J-STD-002, eliminating oxidation concerns during standard SMT processes.
SMAJ43CAHM3_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:
- 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)
SMAJ43CAHM3_A/I FAQ
1.How can I place an order for SMAJ43CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43CAHM3_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 SMAJ43CAHM3_A/I reliable?
The price and inventory of SMAJ43CAHM3_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 SMAJ43CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ43CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43CAHM3_A/I?
SMAJ43CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43CAHM3_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 SMAJ43CAHM3_A/I?
For technical support, including SMAJ43CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43CAHM3_A/I requirements.
6.How does Aetrix verify that SMAJ43CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ43CAHM3_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 SMAJ43CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ43CAHM3_A/I?
All SMAJ43CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43CAHM3_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 SMAJ43CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ43CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ43CAHM3_A/I Tags
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