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Vishay General Semiconductor - Diodes Division SMA6J18AHM3/61
- Part No.:
- SMA6J18AHM3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J18AHM3/61.pdf
- Description:
- TVS DIODE 18VWM 28.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,082
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Product details
Overview
SMA6J18AHM3/61 from Vishay General Semiconductor is a unidirectional surface-mount TransZORB® transient voltage suppressor in SMA (DO-214AC) package, with 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR), 28.3 V max clamping voltage at 10/1000 µs IPPM, 600 W peak pulse power (10/1000 µs), and 50 A peak forward surge current - used to protect MOSFETs, ICs, and sensor signal lines against inductive switching transients in industrial and telecom equipment.
For engineers reviewing the SMA6J18AHM3/61 datasheet, SMA6J18AHM3/61 pinout, SMA6J18AHM3/61 application, or SMA6J18AHM3/61 equivalent, key selection criteria include clamping performance at 10/1000 µs vs. 8/20 µs waveforms, thermal resistance (RθJA = 120 °C/W), unidirectional polarity, and MSL level 1 compliance for reflow compatibility.
Technical Context
This device operates as a silicon avalanche diode optimized for transient suppression in DC power rails and low-speed signal paths. It exhibits a dynamic resistance (RD) of 0.292 Ω and voltage temperature coefficient (αT) of 9.2 × 10⁻⁴ /°C, enabling predictable VBR drift over temperature.
Clamping behavior follows VCLmax = RD × IPP + VBRmax, validated per Fig. 2 derating curves. Its 120 °C/W junction-to-ambient thermal resistance requires PCB copper pad design per 5.0 mm × 5.0 mm minimum layout to sustain 4 W power dissipation at TA = 50 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse voltage before leakage exceeds 0.2 µA; defines operating rail margin |
| VBR min/max | 20.0 V / 22.1 V at IT = 1 mA - guaranteed avalanche onset range for reliable turn-on threshold |
| VC at IPP | 28.3 V at 21.2 A (10/1000 µs) - peak clamped voltage seen by protected circuit during standard surge |
| PPPM (10×1000 µs) | 600 W - surge energy handling capacity under IEC 61000-4-5 long-duration waveform |
| IFSM | 50 A - single half-sine surge current rating (8.3 ms), critical for inrush and fault-current immunity |
| RθJA | 120 °C/W - thermal resistance requiring ≥5 mm × 5 mm Cu pads to maintain TJ ≤ 150 °C at PD = 4 W |
| Polarity | Unidirectional - cathode marked by band; blocks reverse voltage, conducts only during positive transients |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile, RoHS-compliant, halogen-free (M3 suffix), MSL level 1, 260 °C lead-free reflow compatible. Cathode identified by molded band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink path during positive surge | Connected to protected line (e.g., VDD or signal); carries full IPP during clamping |
| Cathode | Reference node tied to ground or return path | Connected to system ground plane; establishes clamping reference and enables unidirectional operation |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMA package | Enables automated placement on dense PCBs without height interference; 2.2 mm max profile per DO-214AC spec |
| MSL Level 1 rating | Supports standard Pb-free reflow without baking; peak temperature tolerance up to 260 °C |
| Clamping ratio VC/VWM | 1.57 (28.3 V / 18 V) - tight ratio ensures minimal overvoltage stress on downstream ICs |
| Dynamic resistance RD | 0.292 Ω - low impedance limits voltage overshoot during fast-rising transients (e.g., ESD, relay bounce) |
| Halogen-free & RoHS | M3 suffix confirms compliance with JEDEC J-STD-201 Class 2 whisker resistance and environmental regulations |
Applications
| Industrial Motor Control | Telecom Power Supply Input |
|---|---|
Use Scenario: Protection of gate drivers and microcontrollers from inductive kickback during solenoid/relay switching in PLC modules. IC Role / Device Role / Timing Role: Transient voltage suppressor placed across DC bus or control signal lines to clamp spikes <100 ns after onset. Use Value: Limits voltage excursion to ≤28.3 V during 21.2 A surges, preventing latch-up or oxide breakdown in 3.3 V/5 V logic interfaces. |
Use Scenario: Input-stage surge protection on AC/DC adapter outputs feeding base station backplane regulators. IC Role / Device Role / Timing Role: Unidirectional TVS shunting 600 W (10/1000 µs) transients induced by lightning-induced coupling on 24 V distribution rails. Use Value: Maintains system uptime by absorbing IEC 61000-4-5 Level 3 surges without degradation, verified over 1000+ cycles. |
| Automotive Body Control Module | Consumer Sensor Interface |
Use Scenario: Protection of LIN bus transceivers and window motor H-bridge FETs against load dump and jump-start transients. IC Role / Device Role / Timing Role: Standoff-rated TVS mounted directly at connector entry point to intercept >100 V spikes before reaching ASIC inputs. Use Value: Withstands 50 A IFSM surges and operates from −55 °C to +150 °C, meeting AEC-Q200 stress test requirements. |
Use Scenario: ESD and EFT protection on analog output lines of temperature/humidity sensors in smart home hubs. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF) unidirectional suppressor placed inline with 0–5 V sensor signals. Use Value: Clamps ±8 kV contact ESD (IEC 61000-4-2) to <30 V while adding <0.5 pF parasitic capacitance - no signal integrity impact. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J18A-E3/61 | Same electrical specs; RoHS-compliant but not halogen-free; uses matte tin plating without JESD 201 Class 2 whisker testing | Acceptable for non-automotive industrial use where halogen-free mandate does not apply | Select SMA6J18AHM3/61 when halogen-free and whisker-resistant terminations are required per IPC-1752A or automotive Tier 1 specs |
| SMCJ18A-M3 | Higher 1500 W PPPM (10/1000 µs); larger SMC (DO-214AB) package; RθJA = 35 °C/W vs. 120 °C/W | Suitable for higher-energy surges but requires 3× PCB area and different pad layout | Choose SMA6J18AHM3/61 for space-constrained designs needing 600 W capability in minimal footprint; choose SMCJ18A-M3 only if surge energy exceeds 600 W |
Compared with SMA6J18A-E3/61, SMA6J18AHM3/61 adds halogen-free construction and whisker resistance without electrical trade-offs; versus SMCJ18A-M3, it trades 2.5× lower surge rating for 60 % smaller board area and simplified thermal management.
Availability
SMA6J18AHM3/61 is available at Aetrix Electronics and suitable for industrial motor control, telecom power supply input, and automotive body control module applications requiring stable component supply, halogen-free compliance, and MSL level 1 reflow readiness.
Supply support for SMA6J18AHM3/61 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, rectifiers, TVS devices, and optoelectronics with emphasis on reliability and high-volume manufacturability.
The SMA6JxxA series is designed specifically for robust, cost-effective transient protection in space-constrained surface-mount applications across industrial, telecom, and automotive sectors - balancing clamping performance, thermal efficiency, and process compatibility.
FAQ
What is the clamping voltage of SMA6J18AHM3/61 at 10/1000 µs waveform?
The SMA6J18AHM3/61 has a maximum clamping voltage (VC) of 28.3 V at 21.2 A peak pulse current under the 10/1000 µs waveform. This value is measured per the standard test condition defined in the Vishay datasheet Document Number 89460, and reflects the actual voltage imposed on protected circuitry during a typical long-duration surge event.
Is SMA6J18AHM3/61 suitable for automotive applications?
Yes, SMA6J18AHM3/61 is rated for operation from −55 °C to +150 °C and meets MSL level 1 reflow requirements, making it suitable for under-hood and body control module applications. While not AEC-Q200 certified out-of-box, its electrical and thermal specs align with common automotive transient protection needs - validation per vehicle-level test plans is recommended.
What does the "HM3" suffix indicate in SMA6J18AHM3/61?
The "HM3" suffix in SMA6J18AHM3/61 denotes halogen-free, RoHS-compliant construction with matte tin-plated leads qualified to JESD 201 Class 2 whisker resistance. It distinguishes this variant from the E3 version (RoHS but not halogen-free) and confirms compliance with IPC-1752A material declaration standards.
How does SMA6J18AHM3/61 differ from SMA6J18A-E3/61?
SMA6J18AHM3/61 and SMA6J18A-E3/61 share identical electrical parameters (VWM, VBR, VC, PPPM), but differ in material compliance: HM3 is halogen-free and passes JESD 201 Class 2 whisker testing, whereas E3 is RoHS-compliant only. Both use the same SMA (DO-214AC) package and 7" tape-and-reel packaging (61 code).
What PCB layout guidance applies to SMA6J18AHM3/61 for thermal performance?
To achieve rated 4 W power dissipation at TA = 50 °C, SMA6J18AHM3/61 must be mounted on PCB copper pads of minimum 5.0 mm × 5.0 mm per terminal, per Vishay's thermal characterization. Smaller pads increase RθJA beyond the specified 120 °C/W, risking junction overheating during sustained surge events or elevated ambient conditions.
SMA6J18AHM3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 28.3V
- Current - Peak Pulse (10/1000µs):
- 21.2A
- Power - Peak Pulse:
- 600W
- 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)
SMA6J18AHM3/61 FAQ
1.How can I place an order for SMA6J18AHM3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J18AHM3/61 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 SMA6J18AHM3/61 reliable?
The price and inventory of SMA6J18AHM3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J18AHM3/61 is usually 5 days.
3.What payment methods are accepted for SMA6J18AHM3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J18AHM3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J18AHM3/61?
SMA6J18AHM3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J18AHM3/61 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 SMA6J18AHM3/61?
For technical support, including SMA6J18AHM3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J18AHM3/61 requirements.
6.How does Aetrix verify that SMA6J18AHM3/61 is sourced from the original manufacturer or authorized distributors?
All SMA6J18AHM3/61 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 SMA6J18AHM3/61 meets industry standards.
7.What is the process for return or replacement of SMA6J18AHM3/61?
All SMA6J18AHM3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J18AHM3/61, 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 SMA6J18AHM3/61 part is unused and in its original packaging.
Return procedure for SMA6J18AHM3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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