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Vishay General Semiconductor - Diodes Division SMAJ43AHM3_A/I
- Part No.:
- SMAJ43AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43AHM3_A/I.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ43AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. 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.
For engineers reviewing the SMAJ43AHM3_A/I datasheet, SMAJ43AHM3_A/I pinout, SMAJ43AHM3_A/I application, or SMAJ43AHM3_A/I equivalent, this device is selected for robust overvoltage protection on DC power rails and signal lines in automotive ECUs, industrial I/O modules, and telecom interface circuits where AEC-Q101 qualification, low-profile mounting, and fast response (<1 ns) are critical.
Technical Context
This TVS diode operates as a clamping-type protector: under normal conditions it presents high impedance (>1 MΩ at 43 V), but switches to low-impedance conduction within <1 ns when reverse voltage exceeds VBR, diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable leakage performance and long-term reliability under repetitive transient stress.
The SMAJ43AHM3_A/I is rated for 40 A peak forward surge current (IFSM, 8.3 ms half-sine), operates across –55 °C to +150 °C junction temperature range, and meets J-STD-020 MSL Level 1 with 260 °C reflow peak. Its halogen-free, RoHS-compliant construction and AEC-Q101 qualification confirm suitability for automotive-grade production environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 48 V systems. |
| VBR (min/max) | 47.8 V / 52.8 V at 1 mA - Confirmed breakdown threshold window; ensures predictable turn-on without premature conduction. |
| VC @ IPPM | 69.4 V at 5.8 A - Clamped voltage during 10/1000 μs surge; limits stress on protected ICs to sub-70 V level. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 μs waveform; supports common IEC 61000-4-5 Level 4 surge immunity. |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms); withstands motor driver back-EMF and relay coil energy dumps. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial enclosures. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.0 mm × 5.0 mm copper pad thermal footprint; optimized for automated placement and reflow. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to system ground or low-side reference; completes clamping loop during transient events. |
| Cathode | Reverse-biased terminal / Protected line connection | Connected to the line being protected (e.g., 48 V rail or CAN_H); conducts only during overvoltage conditions. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for global OEM supply chains and industrial safety standards. |
| 400 W peak pulse power (10/1000 μs) | Provides robust protection against IEC 61000-4-5 surge events without derating below 78 V. |
| Fast response time & low clamping ratio | Sub-1 ns turn-on and VC/VBR ≈ 1.45 ensure minimal overvoltage overshoot on protected nodes. |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking; compatible with high-volume manufacturing processes. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 48 V battery-supplied microcontrollers and gate drivers in electric power steering (EPS) modules from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between 48 V rail and chassis ground to absorb >400 W transients. Use Value: Limits voltage excursion to ≤69.4 V during ISO 7637-2 Pulse 5a events, preventing latch-up or oxide damage in downstream SiC MOSFET drivers. |
Use Scenario: Shielding analog front-end inputs of pressure/temperature sensors in factory automation PLCs from ESD and inductive kickback. IC Role / Device Role / Timing Role: Standoff-rated TVS on 24 V sensor supply line, co-located with RC filter network. Use Value: Maintains signal integrity by clamping transients before they reach precision ADC inputs, with leakage <1 μA at 43 V ensuring minimal offset error. |
| Telecom Data Line Protection | Consumer Power Adapter Output Protection |
|
Use Scenario: Safeguarding RS-485 transceivers in base station remote radio units exposed to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary-level TVS on VCC input of isolated data interface IC, upstream of DC/DC converter. Use Value: Withstands repeated 10/1000 μs surges up to 400 W while maintaining <10 nA leakage at 43 V-critical for low-power sleep modes. |
Use Scenario: Securing the 5 V/12 V output of wall-mounted AC/DC adapters used in smart home hubs against accidental short-circuit transients. IC Role / Device Role / Timing Role: Final-stage overvoltage clamp on secondary-side DC bus, adjacent to USB-PD controller. Use Value: Prevents catastrophic failure of downstream USB-C port controllers during output capacitor fault conditions, with 40 A IFSM tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43AHE3_A/I | Same electrical specs, RoHS-compliant but not halogen-free; uses standard tin plating instead of halogen-free molding compound. | Approved for commercial/industrial use but lacks halogen-free certification required by some automotive Tier 1s. | Select when halogen-free compliance is not mandated and cost optimization is prioritized. |
| SMAJ43A-M3/5A | Identical electrical parameters and halogen-free construction, but supplied in 13" tape-and-reel (7500 pcs) vs. I-pack (7500 pcs); same M3 suffix. | No functional difference; packaging variant only-used for high-volume SMT line feeding with larger reels. | Choose based on assembly line logistics; identical performance and qualification to SMAJ43AHM3_A/I. |
Compared with SMAJ43AHM3_A/I, SMAJ43AHE3_A/I omits halogen-free compliance and may require additional material declarations for automotive programs, while SMAJ43A-M3/5A offers identical performance in an alternate reel format-neither is pin-compatible in the sense of mechanical interchangeability beyond shared DO-214AC footprint.
Availability
SMAJ43AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and telecom infrastructure equipment requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMAJ43AHM3_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, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMAJ series is engineered specifically for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where robustness, fast response, and standardized surface-mount form factor are essential.
FAQ
What is the clamping voltage of the SMAJ43AHM3_A/I under a 10/1000 μs surge?
The SMAJ43AHM3_A/I has a maximum clamping voltage (VC) of 69.4 V at 5.8 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured per Figure 1 in Vishay Document 88390 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ43AHM3_A/I maintains this clamping performance across its full operating temperature range and after repeated surges, provided thermal design follows recommended 0.2" × 0.2" copper pads.
Is SMAJ43AHM3_A/I qualified for automotive applications?
Yes, SMAJ43AHM3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in Revision 09-Jan-2024 of Document 88390. This qualification covers stress testing for temperature cycling, humidity bias, mechanical shock, and accelerated life under high-temperature reverse bias-validating its use in engine compartments, ADAS modules, and body control units. The SMAJ43AHM3_A/I also meets MSL Level 1 and RoHS/halogen-free requirements for full automotive supply chain compliance.
How does the breakdown voltage range of SMAJ43AHM3_A/I compare to its stand-off voltage?
The SMAJ43AHM3_A/I has a minimum breakdown voltage (VBR) of 47.8 V and maximum of 52.8 V at 1 mA test current, while its stand-off voltage (VWM) is 43 V. This 4.8–9.8 V margin ensures reliable non-conduction during normal operation-even with 10 % supply tolerance-and guarantees clamping activation only during genuine overvoltage events. The specified VBR window is verified per ANSI/IEEE C62.35 and appears in Table 1 of the SMAJ5.0A–SMAJ188CA datasheet.
What is the thermal resistance of SMAJ43AHM3_A/I, and how does it affect PCB layout?
The SMAJ43AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W, measured on 0.2" × 0.2" copper pads per terminal. To maintain TJ ≤ 150 °C during repetitive surges, PCB layout must provide adequate copper area-minimum 5.0 mm × 5.0 mm per pad-and avoid excessive trace length between the SMAJ43AHM3_A/I cathode/anode and ground/power planes. Thermal vias under pads further reduce RθJA in high-duty-cycle applications.
Can SMAJ43AHM3_A/I be used in bidirectional configurations?
No, SMAJ43AHM3_A/I is a unidirectional TVS diode, as indicated by the "A" suffix (vs. "CA" for bidirectional variants like SMAJ43CA). Its cathode band marking and asymmetric IV curve mean it conducts only in reverse bias-forward conduction is limited to ~3.5 V at 25 A (per Note 6). For bidirectional protection, engineers must select SMAJ43CA or equivalent; substituting SMAJ43AHM3_A/I in CA-designated positions risks failure during positive-going transients on AC-coupled lines.
SMAJ43AHM3_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:
- 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_A/I FAQ
1.How can I place an order for SMAJ43AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43AHM3_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 SMAJ43AHM3_A/I reliable?
The price and inventory of SMAJ43AHM3_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 SMAJ43AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ43AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43AHM3_A/I?
SMAJ43AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43AHM3_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 SMAJ43AHM3_A/I?
For technical support, including SMAJ43AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43AHM3_A/I requirements.
6.How does Aetrix verify that SMAJ43AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ43AHM3_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 SMAJ43AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ43AHM3_A/I?
All SMAJ43AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43AHM3_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 SMAJ43AHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ43AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ43AHM3_A/I Tags
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