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Vishay General Semiconductor - Diodes Division SMAJ43CAHE3/61
- Part No.:
- SMAJ43CAHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43CAHE3/61.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,140
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Product details
Overview
SMAJ43CAHE3/61 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection on signal and power 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 sensor interfaces, industrial I/O modules, and telecom line protection.
For engineers reviewing the SMAJ43CAHE3/61 datasheet, SMAJ43CAHE3/61 pinout, SMAJ43CAHE3/61 application, or SMAJ43CAHE3/61 equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, clamping performance under surge conditions, thermal resistance data, and direct alternative part comparisons for ESD and lightning transient hardening.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, with no polarity marking on the device body. Its silicon avalanche junction provides sub-nanosecond response to transients, low incremental surge resistance (ensuring stable clamping under high di/dt), and meets UL 497B recognition for protector classification.
Designed for surface-mount automated assembly, it complies with J-STD-020 MSL Level 1 (peak reflow 260 °C), features matte tin-plated leads per J-STD-002, and supports repetitive surge duty cycle of 0.01 % - derated above 78 V to 300 W per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping threshold |
| VBR min/max | 47.8 V / 52.8 V at 1 mA - guaranteed avalanche initiation range; ensures consistent turn-on across production lots |
| VC @ IPPM | 69.4 V at 5.8 A - clamped voltage during 10/1000 μs surge; determines protected circuit's maximum transient exposure |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - peak transient energy absorption capability; defines survivability against IEC 61000-4-5 Level 4 surges |
| ID @ VWM | 1.0 μA - reverse leakage at rated stand-off; critical for low-power sensor biasing and battery-backed circuits |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood automotive or enclosed industrial enclosures |
| RθJA | 120 °C/W - thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs board-level thermal design for sustained surge duty |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Case molded to UL 94 V-0 flammability rating; terminals are matte tin-plated for reliable solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | One terminal of symmetrical avalanche junction; conducts during negative transients relative to cathode reference |
| Cathode | Transient current entry (positive polarity) | Other terminal of symmetrical junction; conducts during positive transients - functionally identical to anode in bidirectional mode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - required for engine control, ADAS, and infotainment power rails |
| 400 W peak pulse power | Withstands 10/1000 μs surge waveforms up to 5.8 A without degradation - meets IEC 61000-4-5 Ed. 3 Annex A requirements |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes voltage overshoot during clamping - preserves margin for 48 V system ICs rated to 75 V absolute maximum |
| MSL Level 1 moisture sensitivity | Zero floor life limitation; allows indefinite storage and standard SMT reflow without baking - reduces manufacturing overhead |
| Glass passivated junction | Enhances long-term stability of breakdown voltage and leakage under humidity and thermal stress - critical for 15-year industrial deployments |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog front-ends from load dump and ISO 7637-2 pulses in vehicle cabin modules. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential signal pair or supply rail to limit transient excursions. Use Value: Clamps 43 V nominal bus to ≤69.4 V during 100 A load dump events, preventing damage to 5 V or 3.3 V interface ICs with 75 V abs max rating. | Use Scenario: Safeguarding 4–20 mA current loop inputs in programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Parallel-connected TVS across input terminals to shunt induced lightning-induced transients before reaching precision op-amps. Use Value: Limits transient voltage to 69.4 V while maintaining <1 μA leakage at 43 V - avoids offset error in 24 V-powered instrumentation amplifiers. |
| Telecom Line Protection | Consumer Power Adapter Output |
Use Scenario: Shielding Ethernet PHY magnetics and PoE injectors from induced surges on outdoor cabling per IEC 61000-4-5. IC Role / Device Role / Timing Role: Secondary-stage TVS mounted after gas discharge tube (GDT) to handle residual fast-rising energy. Use Value: Sub-ns response captures residual 1 kV/μs edges after GDT crowbar action, clamping to 69.4 V without follow-on conduction. | Use Scenario: Output rail protection in USB-C PD adapters where secondary-side 20 V output must survive accidental AC line transients. IC Role / Device Role / Timing Role: Final-stage clamp between +20 V output and ground to absorb coupling from primary-side Y-capacitor failure modes. Use Value: Withstands 400 W surges without thermal runaway; RθJA = 120 °C/W allows operation on compact 2-layer PCBs without heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43CA-M3/61 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification | No functional difference; selected when halogen-free compliance is mandated by OEM environmental policy | Choose SMAJ43CA-M3/61 if halogen-free materials are contractually required; otherwise SMAJ43CAHE3/61 offers same performance with broader supply chain traceability. |
| SMBJ43CAHE3/61 | Same VWM/VBR/VC ratings but in SMB (DO-214AA) package - 27 % larger footprint, 20 % higher PPPM (600 W) | Better suited for high-energy industrial surges where board space permits larger package; not drop-in due to different pad layout | Select SMBJ43CAHE3/61 only when 600 W surge margin is needed and PCB layout accommodates 4.6 mm × 3.6 mm vs. 4.2 mm × 2.6 mm SMA footprint. |
Compared with SMAJ43CA-M3/61, the SMAJ43CAHE3/61 offers identical protection performance with standard RoHS compliance; versus SMBJ43CAHE3/61, it trades 200 W peak power headroom for 30 % smaller board area and lower thermal mass - optimizing for space-constrained automotive ECUs and portable telecom gear.
Availability
SMAJ43CAHE3/61 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O conditioning, and telecom line hardening requiring stable component supply across multi-year production cycles.
Supply support for SMAJ43CAHE3/61 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 application-specific validation.
The SMAJ series targets high-reliability transient suppression in harsh environments; engineered for AEC-Q101 compliance, low clamping ratio, and repeatable surge endurance in automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of the SMAJ43CAHE3/61 under a 10/1000 μs surge?
The SMAJ43CAHE3/61 has a maximum clamping voltage (VC) of 69.4 V at 5.8 A peak pulse current (IPPM) under a 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 standardized surge events. The SMAJ43CAHE3/61 maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is the SMAJ43CAHE3/61 suitable for automotive applications?
Yes, the SMAJ43CAHE3/61 is AEC-Q101 qualified, as confirmed in the Vishay datasheet revision 09-Jan-2024 (document 88390). It undergoes stress testing for temperature cycling, high-temperature reverse bias, and surge endurance per automotive reliability standards. The SMAJ43CAHE3/61 is explicitly designated for use in engine control units, ADAS sensors, and infotainment systems where transient immunity and long-term stability are mandatory.
What does the "HE3" suffix indicate in SMAJ43CAHE3/61?
The "HE3" suffix in SMAJ43CAHE3/61 denotes RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering information table, "HE3" identifies parts that meet both environmental compliance (lead-free, RoHS) and automotive-grade reliability requirements. This distinguishes SMAJ43CAHE3/61 from commercial-grade "E3" variants and halogen-free "HM3" versions - all sharing identical electrical characteristics but differing in qualification scope and material content.
How does the SMAJ43CAHE3/61 differ from unidirectional SMAJ43AHE3/61?
The SMAJ43CAHE3/61 is bidirectional, meaning it clamps transients of either polarity symmetrically across its terminals, with no cathode marking. In contrast, SMAJ43AHE3/61 is unidirectional, featuring a cathode band and conducting only during positive surges relative to that terminal. Their VWM (43 V), VBR (47.8–52.8 V), and VC (69.4 V) are identical, but SMAJ43CAHE3/61 is used where AC-coupled or floating signal lines require protection without polarity constraints.
What is the thermal resistance of the SMAJ43CAHE3/61, and how does it affect PCB layout?
The SMAJ43CAHE3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay thermal characteristics table. This value directly impacts sustained surge handling: for repeated 400 W pulses, adequate copper area and optional internal layer thermal vias are required to prevent junction overheating. Layouts using smaller pads will see higher RθJA and reduced duty-cycle capability.
SMAJ43CAHE3/61 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ43CAHE3/61 FAQ
1.How can I place an order for SMAJ43CAHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43CAHE3/61 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 SMAJ43CAHE3/61 reliable?
The price and inventory of SMAJ43CAHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ43CAHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ43CAHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43CAHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43CAHE3/61?
SMAJ43CAHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43CAHE3/61 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 SMAJ43CAHE3/61?
For technical support, including SMAJ43CAHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43CAHE3/61 requirements.
6.How does Aetrix verify that SMAJ43CAHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ43CAHE3/61 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 SMAJ43CAHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ43CAHE3/61?
All SMAJ43CAHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43CAHE3/61, 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 SMAJ43CAHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ43CAHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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