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Vishay General Semiconductor - Diodes Division SMAJ43CAHM3/I
- Part No.:
- SMAJ43CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43CAHM3/I.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,343
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Product details
Overview
SMAJ43CAHM3/I 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 standoff 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 - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ43CAHM3/I datasheet, SMAJ43CAHM3/I pinout, SMAJ43CAHM3/I application, or SMAJ43CAHM3/I equivalent, this device serves as a halogen-free, AEC-Q101-qualified transient protector for bidirectional signal lines where low clamping voltage, fast response (<1 ns), and MSL Level 1 reflow compatibility are critical selection criteria.
Technical Context
The SMAJ43CAHM3/I operates as a bidirectional avalanche diode, symmetrically clamping both positive and negative transients above its reverse standoff voltage of 43 V. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1 μA at VWM), while its low incremental surge resistance enables effective energy diversion during ESD or lightning-induced surges.
Designed for surface-mount assembly on standard PCB copper pads (0.2" × 0.2"), it delivers 400 W peak pulse power up to 78 V and derates to 300 W above that threshold. Thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), supporting reliable operation within -55 °C to +150 °C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal swing margin for protected line. |
| VBR min/max | 47.8 V / 52.8 V at 1 mA - Confirmed breakdown range ensuring predictable turn-on across production lot and temperature. |
| VC @ IPPM | 69.4 V at 5.8 A - Clamping voltage under 10/1000 μs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 400 W - Peak pulse power handling capability; validates protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges. |
| IPPM | 5.8 A - Peak pulse current corresponding to VC; used to size PCB trace width and verify layout survivability. |
| TJ max | +150 °C - Maximum junction temperature; supports under-hood automotive use with minimal thermal derating. |
| Package | SMA (DO-214AC) - Standardized 2-pin SMD outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height; compatible with automated pick-and-place. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking - both terminals are electrically symmetrical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Either terminal conducts when voltage exceeds ±VBR; no cathode band marking required for bidirectional types. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signal lines without polarity concerns. |
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics requiring reliability under thermal cycling and vibration. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets environmental compliance requirements for global OEM supply chains and end-of-life recycling mandates. |
| MSL Level 1 (260 °C peak) | Supports lead-free reflow soldering without moisture sensitivity limitations - no baking required prior to assembly. |
| 400 W peak pulse power (≤78 V) | Provides robust immunity against ISO 7637-2 pulse 1/2a/3a and IEC 61000-4-5 combination wave surges in industrial environments. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting LIN bus or 12 V power rail inputs in door modules and lighting controllers from load dump and inductive switching transients. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between power rail and ground, responding within <1 ns to suppress spikes exceeding 43 V. Use Value: Limits voltage seen by downstream LDOs and microcontrollers to ≤69.4 V, preventing latch-up or gate oxide damage during 100 V/50 ms load dump events. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) in pressure or temperature transmitters exposed to field wiring surges. IC Role / Device Role / Timing Role: Placed differentially across signal and return lines to clamp common-mode transients while preserving DC accuracy. Use Value: Maintains signal integrity below 69.4 V clamping level, avoiding saturation of op-amps and ADC front-ends during 1 kV EFT bursts. |
| Consumer USB Port ESD Protection | Telecom Data Line Surge Suppression |
|
Use Scenario: Adding secondary-level surge defense on USB VBUS and D+/D− lines in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS shunting ESD strikes (IEC 61000-4-2 ±15 kV contact) to ground before reaching USB PHY. Use Value: Delivers sub-1 ns response with <1 μA leakage at 43 V, ensuring no impact on USB 2.0 signal rise time or eye diagram integrity. |
Use Scenario: Protecting RS-485 transceivers in base station backhaul equipment connected to outdoor cabling. IC Role / Device Role / Timing Role: Mounted across differential pair (A/B) and ground to absorb induced lightning surges per ITU-T K.20/K.21. Use Value: Handles 400 W transient energy without degradation, maintaining communication uptime during multi-kA surge events on telecom infrastructure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43CAHE3/I | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | Preferred for commercial-grade automotive modules where halogen content is unrestricted. | Select when cost sensitivity outweighs halogen-free requirement and full AEC-Q101 validation is mandatory. |
| SMBJ43CAHM3/I | Same VWM/VC, but SMB package (DO-214AA) offers higher 600 W PPPM and lower RθJA (90 °C/W). | Better suited for high-energy surge environments (e.g., industrial motor drives) where PCB space allows larger footprint. | Choose when system-level surge testing exceeds 400 W and thermal management requires lower junction-to-ambient resistance. |
Compared with SMAJ43CAHM3/I, SMAJ43CAHE3/I omits halogen-free certification but retains identical clamping performance and automotive qualification, whereas SMBJ43CAHM3/I trades compactness for higher surge capacity and improved thermal dissipation - guiding selection based on space constraints, environmental compliance, and worst-case surge severity.
Availability
SMAJ43CAHM3/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, consumer USB peripherals, and telecom data line interfaces requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ43CAHM3/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 optimization.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping, AEC-Q101 validation, and halogen-free compliance are mandatory.
FAQ
What does the 'HM3' suffix indicate in SMAJ43CAHM3/I?
The HM3 suffix denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. SMAJ43CAHM3/I meets JESD201 Class 2 whisker resistance and MSL Level 1 reflow profile (260 °C peak), making it suitable for automotive and high-reliability industrial applications where material compliance and thermal robustness are essential. This distinguishes SMAJ43CAHM3/I from non-HM3 variants like SMAJ43CA-E3.
Is SMAJ43CAHM3/I unidirectional or bidirectional?
SMAJ43CAHM3/I is a bidirectional TVS diode, as confirmed by the 'CA' suffix and absence of cathode band marking. It clamps transients equally in both polarities - ideal for protecting AC-coupled lines, differential buses (e.g., RS-485), or power rails subject to reverse-voltage events. Its symmetric VBR range (47.8–52.8 V) and identical forward/reverse characteristics validate true bidirectional operation.
What is the maximum clamping voltage of SMAJ43CAHM3/I under surge conditions?
The maximum clamping voltage (VC) of SMAJ43CAHM3/I is 69.4 V at 5.8 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during standardized surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Can SMAJ43CAHM3/I be used in place of SMAJ43A (unidirectional)?
No - SMAJ43CAHM3/I is bidirectional and lacks polarity marking, while SMAJ43A is unidirectional with cathode identification. Substituting SMAJ43CAHM3/I for SMAJ43A may cause improper clamping on DC-biased lines or interfere with forward conduction paths. Use SMAJ43CAHM3/I only where bidirectional protection is explicitly required and circuit topology supports symmetrical clamping.
Does SMAJ43CAHM3/I meet automotive qualification standards?
Yes, SMAJ43CAHM3/I is AEC-Q101 qualified, as indicated by the 'HM3' suffix per Vishay's ordering nomenclature. This certification validates its performance under accelerated stress tests including temperature cycling, humidity bias HAST, and mechanical shock - confirming suitability for automotive powertrain, chassis, and body electronics applications per ISO/TS 16949 requirements.
SMAJ43CAHM3/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:
- -
- 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/I FAQ
1.How can I place an order for SMAJ43CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43CAHM3/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/I reliable?
The price and inventory of SMAJ43CAHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMAJ43CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43CAHM3/I?
SMAJ43CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43CAHM3/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/I?
For technical support, including SMAJ43CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43CAHM3/I requirements.
6.How does Aetrix verify that SMAJ43CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ43CAHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMAJ43CAHM3/I?
All SMAJ43CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43CAHM3/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/I part is unused and in its original packaging.
Return procedure for SMAJ43CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ43CAHM3/I Tags
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