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Vishay General Semiconductor - Diodes Division SMAJ43AHM3/H
- Part No.:
- SMAJ43AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43AHM3/H.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,811
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Product details
Overview
SMAJ43AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features 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 - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ43AHM3/H datasheet, SMAJ43AHM3/H pinout, SMAJ43AHM3/H application, or SMAJ43AHM3/H equivalent, key selection criteria include its AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, 150 °C max junction temperature, low incremental surge resistance, and suitability for inductive load switching and ESD protection in 12 V/24 V DC systems.
Technical Context
This TVS diode operates as a unidirectional clamping device: reverse-biased during normal operation, it remains high-impedance until transient voltage exceeds VBR, then avalanches to limit voltage across protected circuitry. Its glass-passivated junction ensures stable breakdown and fast response (<1 ns), while the SMA package supports automated SMT placement and meets MSL level 1 (260 °C reflow).
The SMAJ43AHM3/H is rated for 400 W peak pulse power (10/1000 μs) up to 78 V; above that threshold, derating applies to 300 W. Its thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), requiring appropriate PCB copper pad area (0.2" × 0.2") for full power handling per Vishay's test conditions.
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 defining turn-on consistency |
| VC @ IPPM | 69.4 V at 5.8 A - clamped voltage seen by protected circuit during worst-case 10/1000 μs surge |
| PPPM | 400 W - peak transient energy absorption capability under standard waveform, critical for IEC 61000-4-5 compliance |
| ID @ VWM | 1.0 μA - leakage current at stand-off voltage, ensuring minimal standby power loss and signal integrity |
| TJ max. | +150 °C - maximum junction temperature enabling use in under-hood automotive environments |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with cathode band marking, compatible with JEDEC MS-013 |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL level 1 compliant. Cathode indicated by band on body; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts avalanche current to ground during overvoltage events |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path to complete clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensors under stress conditions |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations without compromising thermal or electrical performance |
| 400 W peak pulse power (10/1000 μs) | Supports robust protection against ISO 7637-2 pulse 1/2a/2b and IEC 61000-4-5 surge events |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage stress on downstream components compared to higher-ratio suppressors |
| Fast response time (<1 ns) | Engages before sensitive semiconductor junctions experience destructive voltage overshoot |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply rails in body control modules from load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and LDO input to clamp transients before regulation stage. Use Value: Limits voltage to ≤69.4 V during 400 W surges, preventing damage to 36 V-rated regulators and microcontrollers. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC analog inputs. IC Role / Device Role / Timing Role: TVS mounted at sensor connector to shunt ESD and cable discharge events before signal conditioning circuitry. Use Value: 1.0 μA leakage preserves mV-level signal accuracy; 69.4 V clamping prevents ADC saturation or op-amp latch-up. |
| DC Motor Drive Gate Protection | Telecom Power Supply Input Stage |
Use Scenario: Shielding N-channel MOSFET gate drivers from flyback voltage induced by brushed DC motor commutation. IC Role / Device Role / Timing Role: TVS placed between gate driver output and MOSFET gate to clamp negative-going spikes below -0.7 V and positive surges to ≤69.4 V. Use Value: Fast <1 ns response prevents gate oxide breakdown; SMA footprint allows placement within 2 mm of driver IC. |
Use Scenario: Front-end surge suppression on 48 V telecom rectifier outputs feeding base station backplane. IC Role / Device Role / Timing Role: Primary clamping device on DC input bus, coordinated with MOVs and fuses for multi-stage protection. Use Value: 43 V VWM matches nominal 48 V system with 10 % margin; 400 W rating handles repeated lightning-induced surges per GR-1089-CORE. |
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/H | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs HM3) | Lacks halogen-free certification required for some automotive Tier 1 programs | Select when halogen-free requirement is not mandated and cost optimization is prioritized |
| SMBJ43A-H | Higher 600 W PPPM rating; SMB package (DO-214AA), larger footprint and 150 °C TJ rating | Better suited for higher-energy surges; requires PCB layout change due to larger body and lead spacing | Choose when system-level surge testing exceeds 400 W or when thermal margin is constrained |
Compared with SMAJ43AHM3/H, SMAJ43AHE3/H offers identical protection performance without halogen-free assurance, while SMBJ43A-H provides greater surge capacity at the cost of board space and compatibility - making SMAJ43AHM3/H optimal for space-constrained, AEC-Q101–mandated 43 V rail protection.
Availability
SMAJ43AHM3/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom power supplies requiring stable component supply with AEC-Q101 qualification and halogen-free compliance.
Supply support for SMAJ43AHM3/H 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade validation.
The SMAJ series was developed specifically for high-reliability transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where consistent clamping, low leakage, and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SMAJ43AHM3/H under a 10/1000 μs surge?
The SMAJ43AHM3/H has a maximum clamping voltage (VC) of 69.4 V at 5.8 A peak pulse current under the standardized 10/1000 μs waveform. This value is measured per Fig. 1 in Vishay document 88390 and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMAJ43AHM3/H qualified for automotive applications?
Yes, SMAJ43AHM3/H is AEC-Q101 qualified, as confirmed by the "HM3" suffix in its ordering code and explicit note in Vishay's datasheet revision 09-Jan-2024. This qualification covers stress tests including HTGB, HTRB, TCT, and ESD, validating its use in engine control, infotainment, and ADAS subsystems where reliability under thermal and mechanical stress is essential.
How does the HM3 suffix differ from E3 in SMAJ43A variants?
The HM3 suffix denotes halogen-free, RoHS-compliant construction with whisker-resistant matte tin plating, whereas E3 indicates RoHS-compliant but non-halogen-free material. Both meet JESD201 Class 2 whisker testing, but only HM3 satisfies strict automotive and green-electronics mandates requiring bromine/chlorine restrictions - a distinction clearly defined in Vishay's ordering information table on page 3 of document 88390.
What is the thermal resistance of SMAJ43AHM3/H, and how does it affect PCB layout?
SMAJ43AHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W. To achieve rated 400 W pulse power, Vishay specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal - underscoring that insufficient copper area will cause thermal derating and reduced surge capability in real-world layouts.
Can SMAJ43AHM3/H be used in bidirectional configurations?
No, SMAJ43AHM3/H is unidirectional only, as indicated by the "A" (not "CA") suffix and cathode band marking. Bidirectional operation requires the "CA" variant (e.g., SMAJ43CA), which lacks polarity marking and exhibits symmetrical breakdown in both directions. Using SMAJ43AHM3/H in reverse-biased AC paths would result in forward conduction and failure.
SMAJ43AHM3/H 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/H FAQ
1.How can I place an order for SMAJ43AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43AHM3/H 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/H reliable?
The price and inventory of SMAJ43AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ43AHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ43AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43AHM3/H?
SMAJ43AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43AHM3/H 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/H?
For technical support, including SMAJ43AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43AHM3/H requirements.
6.How does Aetrix verify that SMAJ43AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ43AHM3/H 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/H meets industry standards.
7.What is the process for return or replacement of SMAJ43AHM3/H?
All SMAJ43AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43AHM3/H, 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/H part is unused and in its original packaging.
Return procedure for SMAJ43AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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