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Vishay General Semiconductor - Diodes Division SMAJ43CAHM3/H
- Part No.:
- SMAJ43CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43CAHM3/H.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,046
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Product details
Overview
SMAJ43CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust ESD and surge protection on signal/power lines. It features 43 V stand-off 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), making it suitable for protecting automotive sensor interfaces and industrial I/O circuits against inductive switching transients.
For engineers reviewing the SMAJ43CAHM3/H datasheet, SMAJ43CAHM3/H pinout, SMAJ43CAHM3/H application, or SMAJ43CAHM3/H equivalent, key selection criteria include its bidirectional polarity, AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, and verified clamping performance under repetitive 0.01% duty cycle surges.
Technical Context
This device operates as a voltage-clamped shunt protector with symmetrical breakdown behavior in both directions due to its bidirectional construction. Its glass-passivated junction ensures stable VBR (47.8–52.8 V at 1 mA) and low incremental surge resistance, enabling fast response (<1 ns) to transients while maintaining low leakage (<1.0 μA at 43 V).
Thermally, it exhibits RθJA = 120 °C/W and RθJL = 30 °C/W, supporting reliable operation up to TJ = +150 °C. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification-critical for automotive-grade deployment in engine control units and ADAS sensor modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe signal line operating margin. |
| VBR min/max | 47.8 V / 52.8 V at 1 mA - Verified breakdown range ensures consistent turn-on across production lots and temperature. |
| VC @ IPPM | 69.4 V at 5.8 A - Clamping voltage limits downstream IC stress during 10/1000 μs surge events per IEC 61000-4-5. |
| PPPM | 400 W (≤78 V) - Peak pulse power rating enables protection against high-energy transients without thermal runaway. |
| ID @ VWM | <1.0 μA - Ultra-low reverse leakage preserves signal integrity and battery life in always-on sensor nodes. |
| TJ max. | +150 °C - Junction temperature rating supports under-hood automotive use and industrial environments with minimal derating. |
| Package | SMA (DO-214AC) - Surface-mount footprint compatible with automated assembly; 5.0 mm × 5.0 mm copper pad layout required for rated PPPM. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; bidirectional configuration has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink (bidirectional) | One terminal of symmetrical PN junction; conducts surge current in either direction when V > |VBR|. |
| Cathode | Transient current sink (bidirectional) | Second terminal of symmetrical PN junction; functionally identical to Anode in CA devices; no band marking. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including powertrain and chassis systems per stress test requirements. |
| Halogen-free & RoHS | HM3 suffix confirms full compliance with JEDEC J-STD-020 MSL level 1 and JESD201 Class 2 whisker resistance. |
| 400 W peak pulse power | Rated for 10/1000 μs waveform at TA = 25 °C on 5.0 mm × 5.0 mm copper pads-meets IEC 61000-4-5 Level 4. |
| Fast response time | <1 ns turn-on enables suppression of ESD events (IEC 61000-4-2) before sensitive CMOS inputs are damaged. |
| Low clamping ratio | VC/VWM = 1.61 - Tight clamping margin minimizes overvoltage exposure to protected ICs like CAN transceivers or ADC front-ends. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
|
Use Scenario: Protecting LIN bus and analog sensor outputs (e.g., pressure, temperature) in engine control modules from load dump and inductive kickback. IC Role / Device Role / Timing Role: Shunt TVS diode placed directly at connector entry point to clamp transients before reaching MCU analog inputs or LIN transceivers. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V sensor signal chains while maintaining <1 μA leakage for low-power sleep modes. |
Use Scenario: Safeguarding RS-485/RS-232 communication lines in PLC backplanes exposed to field wiring surges and ground loop transients. IC Role / Device Role / Timing Role: Bidirectional clamping element across differential pairs or single-ended lines, referenced to local ground plane. Use Value: Enables reliable 250 kbps+ data transmission in noisy factory environments by limiting common-mode spikes to ≤69.4 V. |
| Consumer Power Adapter Input | Telecom Line Card Protection |
|
Use Scenario: Secondary-side DC input protection for USB-C PD adapters and wireless charging controllers against AC line coupling and hot-swap transients. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between rectified DC output and primary-side controller IC supply rail. Use Value: Absorbs 400 W surges without degradation, preserving 12–24 V system stability and avoiding false shutdowns in multi-port adapters. |
Use Scenario: Overvoltage protection on POTS line interface circuits in VoIP gateways and DSLAM line cards subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level shunt protector mounted before hybrid transformer and SLIC IC to limit induced common-mode energy. Use Value: Maintains >60 dB common-mode rejection up to 10 kHz while surviving repeated 10/700 μs telecom surges per ITU-T K.20. |
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/H | Same electrical specs and AEC-Q101 qualification, but RoHS-compliant without halogen-free requirement (E3 vs HM3). | Acceptable for non-automotive industrial designs where halogen-free mandate does not apply. | Select SMAJ43CAHE3/H for cost-sensitive commercial applications lacking automotive or green-material requirements. |
| SMBJ43CAHM3 | Higher 600 W PPPM rating and SMB (DO-214AA) package; same VWM/VC but larger footprint and higher thermal mass. | Better suited for high-reliability power supply rails where 400 W is marginal; requires PCB layout change. | Choose SMBJ43CAHM3 only when surge energy exceeds 400 W or board space allows larger package for improved thermal margin. |
Compared with SMAJ43CAHM3/H, SMAJ43CAHE3/H offers identical protection performance without halogen-free assurance, while SMBJ43CAHM3 delivers higher surge capacity at the cost of increased size and layout impact-making SMAJ43CAHM3/H optimal for space-constrained AEC-Q101-compliant signal-line protection.
Availability
SMAJ43CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial I/O modules, and telecom line card protection requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ43CAHM3/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 is engineered specifically for high-speed transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where repeatable clamping and AEC-Q101 compliance are mandatory.
FAQ
What does the 'HM3' suffix indicate in SMAJ43CAHM3/H?
The HM3 suffix in SMAJ43CAHM3/H denotes halogen-free, RoHS-compliant construction and full AEC-Q101 qualification. This means the device meets automotive reliability standards-including temperature cycling, humidity testing, and mechanical shock-and contains no brominated flame retardants or chlorine-based compounds, satisfying strict environmental mandates for Tier 1 automotive suppliers. SMAJ43CAHM3/H is certified for under-hood deployment.
How does SMAJ43CAHM3/H differ from unidirectional SMAJ43A variants?
SMAJ43CAHM3/H is bidirectional, meaning it clamps symmetrically in both polarities with no cathode marking, whereas unidirectional SMAJ43A has a cathode band and only protects against reverse-polarity surges. SMAJ43CAHM3/H is used on AC-coupled or floating lines like RS-485, LIN, or antenna feeds, while SMAJ43A suits DC-biased rails such as 5 V microcontroller I/O. Their VWM, VC, and PPPM ratings are otherwise identical.
What is the maximum clamping voltage of SMAJ43CAHM3/H under surge conditions?
The maximum clamping voltage (VC) of SMAJ43CAHM3/H is 69.4 V at 5.8 A peak pulse current (IPPM), measured with a 10/1000 μs waveform. This value is guaranteed across the full operating temperature range (−55 °C to +150 °C) and defines the upper voltage limit imposed on protected circuitry during transient events-critical for ensuring compatibility with 3.3 V, 5 V, or 12 V logic interfaces.
Can SMAJ43CAHM3/H be used in place of SMAJ40CAHM3/H?
No-SMAJ43CAHM3/H is not a direct replacement for SMAJ40CAHM3/H due to differing stand-off voltages (43 V vs 40 V) and corresponding breakdown ranges (47.8–52.8 V vs 44.4–49.1 V). Substituting SMAJ43CAHM3/H may result in premature clamping on nominal 40 V systems or insufficient protection margin on 43 V rails. Always verify VWM alignment with system operating voltage before interchange.
What PCB layout guidance applies to SMAJ43CAHM3/H for rated 400 W performance?
To achieve the full 400 W peak pulse power rating, SMAJ43CAHM3/H must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, per Vishay's datasheet Fig. 1 and Note (2). Smaller pads cause thermal derating; for example, 0.1" × 0.1" pads reduce PPPM to ~200 W. Thermal vias under pads and internal ground planes further improve sustained surge handling in SMAJ43CAHM3/H layouts.
SMAJ43CAHM3/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:
- -
- 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/H FAQ
1.How can I place an order for SMAJ43CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43CAHM3/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 SMAJ43CAHM3/H reliable?
The price and inventory of SMAJ43CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ43CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ43CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43CAHM3/H?
SMAJ43CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43CAHM3/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 SMAJ43CAHM3/H?
For technical support, including SMAJ43CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43CAHM3/H requirements.
6.How does Aetrix verify that SMAJ43CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ43CAHM3/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 SMAJ43CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ43CAHM3/H?
All SMAJ43CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43CAHM3/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 SMAJ43CAHM3/H part is unused and in its original packaging.
Return procedure for SMAJ43CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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