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Vishay General Semiconductor - Diodes Division SMAJ43AHM3_A/H
- Part No.:
- SMAJ43AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43AHM3_A/H.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ43AHM3_A/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 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 (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive ECUs, industrial sensor interfaces, and DC power rail protection.
For engineers reviewing the SMAJ43AHM3_A/H datasheet, SMAJ43AHM3_A/H pinout, SMAJ43AHM3_A/H application, or SMAJ43AHM3_A/H equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free RoHS-compliant construction (HM3 suffix), low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a unidirectional clamping device, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and stable clamping under repetitive 10/1000 μs surges. Its thermal resistance (RθJA = 120 °C/W) and junction temperature range (–55 °C to +150 °C) support operation in harsh environments including under-hood automotive and industrial control cabinets.
The SMAJ43AHM3_A/H exhibits a positive temperature coefficient of VBR (+0.102 %/°C), ensuring predictable voltage drift across temperature. Its 3.3 W steady-state power dissipation (PD) and 40 A peak forward surge current (IFSM) rating enable robust handling of both transient and short-duration overcurrent events without latch-up or thermal runaway.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC bias margin for protected line. |
| VBR min/max | 47.8 V / 52.8 V at IT = 1 mA - Confirmed breakdown window ensures reliable turn-on within spec across production lot and temperature. |
| VC @ IPPM | 69.4 V at 5.8 A - Clamping voltage under standardized 10/1000 μs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 400 W - Peak pulse power handling capability; validated per Fig. 1 curve with 0.2" × 0.2" copper pad layout. |
| ID @ VWM | 1.0 μA - Reverse leakage at rated stand-off voltage; low value minimizes standby power loss in battery-powered systems. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in high-ambient environments such as engine control modules. |
| 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, MSL Level 1 (260 °C peak reflow), UL 94 V-0 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / low-side connection | Connected to ground or lower-potential node in unidirectional configuration; forms return path during clamping. |
| Cathode | Reverse-biased terminal / high-side connection | Connected to protected line (e.g., 43 V rail); blocks conduction until VWM exceeded, then conducts surge to anode. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces per stress test requirements. |
| Halogen-free & RoHS-compliant (HM3) | Meets JESD201 Class 2 whisker resistance and environmental compliance mandates for Tier 1 automotive supply chains. |
| 400 W peak pulse power (10/1000 μs) | Provides immunity against ISO 7637-2 Pulse 1, 2a, 3a/b, and IEC 61000-4-5 surge events when mounted per recommended pad layout. |
| Glass passivated junction | Ensures stable VBR and low leakage over lifetime; eliminates risk of moisture-induced degradation in humid or condensing environments. |
| Low profile SMA package | 0.208" × 0.157" footprint with 0.090" height enables dense PCB layouts while maintaining thermal performance via lead-frame conduction. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Clamp |
|---|---|
Use Scenario: Protecting 42 V battery-fed microcontroller power inputs in start-stop systems against load dump transients up to 120 V. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between VCC and GND, conducting only during overvoltage events to limit rail excursion. Use Value: Limits peak voltage to ≤69.4 V, preserving MCU functionality and eliminating need for oversized input capacitors or secondary regulators. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure sensors in factory automation from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across signal and return, responding in <1 ns to clamp fast transients before op-amp input stages. Use Value: Maintains signal integrity with <1.0 μA leakage at 43 V, enabling accurate low-current measurement without offset drift. |
| DC-DC Converter Input Stage | OBD-II Diagnostic Interface Protection |
Use Scenario: Safeguarding buck converter input stage against back-EMF from solenoid drivers in HVAC control modules. IC Role / Device Role / Timing Role: Primary transient shunt on 48 V input rail, absorbing 400 W pulses without degradation over >10,000 surge cycles. Use Value: Eliminates need for series fusing or active crowbar circuits, reducing BOM count and board area by 35% vs. discrete Zener+capacitor solutions. |
Use Scenario: Hardening OBD-II CAN bus power pins (VBAT, IGN) against jump-start voltage spikes and alternator ripple in service tools. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12/42 V diagnostic power lines, suppressing transients before they reach USB-to-CAN bridge ICs. Use Value: Enables uninterrupted diagnostics during vehicle cranking; verified to survive 1000+ ISO 16750-2 Test 4a cycles without parameter shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43AHE3_A/H | Same electrical specs, but RoHS-compliant with lead-free solderability (E3 suffix); no halogen-free requirement. | Preferred for commercial/industrial designs where halogen content is not mandated; slightly higher cost for automotive-tier traceability. | Select SMAJ43AHE3_A/H if AEC-Q101 is not required and standard RoHS compliance suffices. |
| SMAJ43A-M3/61 | Identical electrical and thermal specs; differs only in packaging format (61 = 7" reel, 1800 pcs) and base P/N suffix convention. | No functional difference; used interchangeably where tape-and-reel logistics align with SMT line setup. | Choose SMAJ43A-M3/61 when sourcing from distributors with legacy inventory or specific reel-size requirements. |
Compared with SMAJ43AHM3_A/H, SMAJ43AHE3_A/H offers identical protection performance without halogen-free certification, while SMAJ43A-M3/61 provides identical functionality in a different packaging variant - neither is pin-compatible in the sense of mechanical interchangeability beyond shared SMA footprint, but all three share identical electrical behavior and thermal derating curves.
Availability
SMAJ43AHM3_A/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and DC power system hardening requiring stable component supply, long-term lifecycle assurance, and AEC-Q101-compliant traceability.
Supply support for SMAJ43AHM3_A/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 qualification.
The SMAJ series was developed specifically for high-energy transient suppression in automotive and industrial power systems, balancing clamping precision, surge endurance, and SMT manufacturability in compact packages.
FAQ
What is the clamping voltage of the SMAJ43AHM3_A/H under a 10/1000 μs surge?
The SMAJ43AHM3_A/H has a maximum clamping voltage (VC) of 69.4 V at 5.8 A peak pulse current (IPPM), measured per the 10/1000 μs waveform defined in IEC 61000-4-5. This value is guaranteed across the full operating temperature range and represents the upper bound of voltage seen by downstream circuitry during surge events - critical for validating IC overvoltage tolerance margins in designs using the SMAJ43AHM3_A/H.
Is the SMAJ43AHM3_A/H AEC-Q101 qualified?
Yes, the SMAJ43AHM3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code structure: the "HM3" suffix denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. This qualification covers stress tests including HTGB, HTRB, TCT, and ESD per AEC-Q101 Rev D, making the SMAJ43AHM3_A/H suitable for automotive powertrain and chassis applications.
What does the "HM3" suffix mean in SMAJ43AHM3_A/H?
The "HM3" suffix in SMAJ43AHM3_A/H indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Specifically, "H" denotes the halogen-free material set, "M3" confirms RoHS compliance and JESD201 Class 2 whisker resistance, and the "_A/H" denotes packaging revision and reel size (7" diameter, 1800 pcs). This distinguishes it from E3 (RoHS only) and HE3 (RoHS + AEC-Q101) variants - all sharing identical electrical specs but differing in compliance scope.
Can the SMAJ43AHM3_A/H be used in bidirectional configurations?
No, the SMAJ43AHM3_A/H is a unidirectional TVS diode, as indicated by the "A" (not "CA") suffix and presence of cathode band marking. Bidirectional operation requires the "CA" variant (e.g., SMAJ43CA), which lacks polarity marking and supports symmetrical clamping in both directions. Using SMAJ43AHM3_A/H in bidirectional circuits would result in forward conduction during negative transients, potentially damaging the device or failing to protect.
What is the thermal resistance of the SMAJ43AHM3_A/H?
The SMAJ43AHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on the minimum recommended 0.2" × 0.2" copper pads per terminal, and a junction-to-lead resistance (RθJL) of 30 °C/W. These values define its steady-state power dissipation limit (3.3 W at TA = 50 °C) and must be applied in thermal simulations for high-duty-cycle or high-ambient applications - especially relevant in under-hood automotive deployments of the SMAJ43AHM3_A/H.
SMAJ43AHM3_A/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:
- 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/H FAQ
1.How can I place an order for SMAJ43AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43AHM3_A/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_A/H reliable?
The price and inventory of SMAJ43AHM3_A/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_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ43AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43AHM3_A/H?
SMAJ43AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43AHM3_A/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_A/H?
For technical support, including SMAJ43AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43AHM3_A/H requirements.
6.How does Aetrix verify that SMAJ43AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ43AHM3_A/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_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ43AHM3_A/H?
All SMAJ43AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43AHM3_A/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_A/H part is unused and in its original packaging.
Return procedure for SMAJ43AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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