My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMA6J18AHM3/5A
- Part No.:
- SMA6J18AHM3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J18AHM3/5A.pdf
- Description:
- TVS DIODE 18VWM 28.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,299
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMA6J18AHM3/5A 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 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR at IT = 1 mA), 28.3 V maximum clamping voltage (VC) at 10/1000 μs 65.9 A pulse, and 600 W peak pulse power rating - deployed to protect MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMA6J18AHM3/5A datasheet, SMA6J18AHM3/5A pinout, SMA6J18AHM3/5A application, or SMA6J18AHM3/5A equivalent, key selection criteria include verified unidirectional polarity, clamping performance under 10/1000 μs and 8/20 μs surge waveforms, thermal resistance (RθJA = 120 °C/W), MSL Level 1 compliance, and halogen-free RoHS-compliant construction per suffix M3.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches to limit transient energy across protected circuit nodes. Its dynamic resistance (RD = 0.292 Ω) and low leakage current (ID ≤ 0.2 μA at VWM) ensure minimal standby loading while delivering fast response to ESD and lightning-induced surges.
Rated for -55 °C to +150 °C junction temperature, it sustains 50 A non-repetitive forward surge current (IFSM) and dissipates 4 W at TA = 50 °C with no heatsink required for typical PCB layouts using 5.0 mm × 5.0 mm copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before conduction begins; defines safe standoff level for 18 V nominal rails. |
| VBR (min/max) | 20.0 V / 22.1 V at IT = 1 mA - Verified avalanche onset range; ensures predictable turn-on margin above VWM. |
| VC @ IPPM | 28.3 V at 65.9 A (10/1000 μs) - Clamping voltage under standard surge; guarantees downstream ICs see ≤28.3 V during transient events. |
| PPPM (10/1000 μs) | 600 W - Peak pulse power handling capacity; supports protection against IEC 61000-4-5 Level 3 surges on 24 V systems. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance; enables thermal design with standard FR-4 PCB copper area without forced cooling. |
| Polarity | Unidirectional - Cathode-band marked; suitable only for DC-biased or positive-polarity transient suppression, not AC line applications. |
| MSL Level | Level 1 (J-STD-020) - No floor life limitation; compatible with standard SMT reflow up to 260 °C peak without baking. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded epoxy case meeting UL 94 V-0; matte tin-plated leads solderable per J-STD-002/JESD 22-B102; cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during forward conduction; connected to lower-potential node in unidirectional configuration. | Enables forward surge current path (IFSM = 50 A); must be routed to ground or return path in clamping topology. |
| Cathode | Current exit during reverse avalanche; connected to protected line (e.g., 18 V rail or signal trace). | Defines clamping reference point; voltage between cathode and anode is limited to ≤28.3 V during transients. |
Key Features
| Feature | Design Value |
|---|---|
| Halogen-free, RoHS-compliant construction | M3 suffix confirms full halogen-free material set and industrial-grade reliability per JEDEC standards. |
| Low-profile SMA package | 0.208" × 0.157" footprint with 0.074" height - enables high-density layout and automated placement on compact PCBs. |
| Clamping efficiency (VC/VBR) | 1.41× (28.3 V / 20.0 V) - Tight ratio ensures minimal overvoltage overshoot during fast transients. |
| Dynamic resistance (RD) | 0.292 Ω - Low impedance during clamping reduces voltage rise under high-current surges (ΔV = RD × IPP). |
| Junction temperature range | -55 °C to +150 °C - Supports operation in harsh environments including industrial motor drives and outdoor telecom enclosures. |
Applications
| Industrial Motor Drive Protection | Telecom Power Rail Clamping |
|---|---|
|
Use Scenario: Suppressing inductive kickback from relay coils and solenoid drivers in PLC I/O modules. IC Role / Device Role / Timing Role: Shunt TVS placed across 24 V DC coil supply to clamp flyback spikes before they reach driver ICs or microcontrollers. Use Value: Limits transient voltage to ≤28.3 V, preventing latch-up or gate oxide damage in 3.3 V/5 V logic interfaces sharing the same ground plane. |
Use Scenario: Protecting 18 V bias rails feeding RF front-end amplifiers in base station power supplies. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between 18 V rail and chassis ground to absorb lightning-induced surges per IEC 61000-4-5. Use Value: Withstands 600 W (10/1000 μs) pulses without degradation, maintaining stable VWM = 18 V for long-term system uptime. |
| Automotive Body Control Module (BCM) | Consumer Sensor Interface Protection |
|
Use Scenario: Safeguarding LIN bus transceivers and window lift motor controllers against load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS installed on 12 V–18 V supply inputs to absorb ISO 7637-2 Pulse 5a surges. Use Value: MSL Level 1 and -55 °C to +150 °C rating ensure robustness through automotive reflow and under-hood thermal cycling. |
Use Scenario: Shielding analog output lines of temperature/humidity sensors in smart home hubs from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-leakage (≤0.2 μA) TVS placed on sensor VOUT traces to prevent false readings or ADC saturation during human-body-model ESD. Use Value: Clamps 8/20 μs surges to ≤33.2 V at 102 A, preserving signal integrity without adding capacitance that would distort <10 kHz sensor bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J18AHE3/5A | Same electrical specs but RoHS-compliant E3 suffix (tin-lead-free, not halogen-free); RθJA identical; MSL Level 1 retained. | No halogen-free requirement; acceptable where industrial grade is sufficient but halogen restriction is not mandated. | Select SMA6J18AHE3/5A if halogen-free certification is unnecessary and cost sensitivity favors standard RoHS over M3. |
| SMCJ18A-M3/57 | Higher-power SMC (DO-214AB) package: 1500 W PPPM (10/1000 μs), VC = 29.2 V at 51.7 A, RθJA = 40 °C/W - larger footprint, higher surge capacity. | Required for >1000 W surge immunity or extended thermal margin in high-power industrial inverters. | Choose SMCJ18A-M3/57 only when 600 W is insufficient and PCB space allows larger SMC package; not drop-in compatible. |
Compared with SMA6J18AHM3/5A, SMA6J18AHE3/5A offers identical protection performance with standard RoHS compliance, while SMCJ18A-M3/57 provides significantly higher surge rating at the cost of larger size and different thermal behavior - neither is pin-compatible, but both serve adjacent design tiers in unidirectional TVS selection.
Availability
SMA6J18AHM3/5A is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control modules, and consumer sensor interfaces requiring stable component supply, halogen-free compliance, and MSL Level 1 manufacturability.
Supply support for SMA6J18AHM3/5A 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, precision, and high-volume manufacturability.
The SMA6JxxA series is part of Vishay's Transient Voltage Suppressor family, engineered specifically for robust, low-profile, surface-mount surge protection in industrial, automotive, and telecom power and signal lines.
FAQ
What is the clamping voltage of SMA6J18AHM3/5A under a 10/1000 μs surge?
The SMA6J18AHM3/5A has a maximum clamping voltage (VC) of 28.3 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 65.9 A. This value is measured per the test conditions specified in the Vishay datasheet (Document Number: 89460), with device mounted on 5.0 mm × 5.0 mm copper pads. The SMA6J18AHM3/5A maintains this clamping performance across its qualified temperature range.
Is SMA6J18AHM3/5A suitable for bidirectional transient suppression?
No, the SMA6J18AHM3/5A is strictly unidirectional, as confirmed by Vishay's documentation stating "Available in unidirectional polarity only" and specifying cathode-band marking. It conducts only in reverse avalanche mode and does not suppress negative-going transients on AC-coupled lines. For bidirectional protection, a dedicated symmetric TVS like SMA6J18CA must be selected instead of SMA6J18AHM3/5A.
What does the "M3" suffix indicate in SMA6J18AHM3/5A?
The "M3" suffix in SMA6J18AHM3/5A denotes halogen-free, RoHS-compliant, industrial-grade construction per Vishay's material categorization standard. It confirms compliance with JEDEC JESD201 Class 2 whisker testing and UL 94 V-0 flammability rating. This distinguishes it from the "E3" variant, which is RoHS-compliant but not halogen-free - a critical distinction for environmental compliance in EU and Asia-Pacific markets.
Can SMA6J18AHM3/5A be used on a 24 V DC system?
Yes, the SMA6J18AHM3/5A is commonly applied on 24 V DC systems where transient clamping is needed - its 18 V stand-off voltage (VWM) provides adequate margin below 24 V nominal, and its 28.3 V clamping voltage remains safely below typical 30 V absolute maximum ratings of many DC-DC controllers and interface ICs. System validation must confirm that worst-case surge energy stays within the 600 W (10/1000 μs) rating of the SMA6J18AHM3/5A.
What is the thermal resistance of SMA6J18AHM3/5A, and how does it affect PCB layout?
The SMA6J18AHM3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on PCBs with 5.0 mm × 5.0 mm copper pads per terminal. This value assumes no external heatsinking; exceeding 4 W power dissipation (at TA = 50 °C) requires increased copper area or thermal vias. Layout must maintain minimum pad dimensions and avoid excessive trace length to preserve thermal and surge-current integrity for the SMA6J18AHM3/5A.
SMA6J18AHM3/5A 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)
SMA6J18AHM3/5A FAQ
1.How can I place an order for SMA6J18AHM3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J18AHM3/5A 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 SMA6J18AHM3/5A reliable?
The price and inventory of SMA6J18AHM3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J18AHM3/5A is usually 5 days.
3.What payment methods are accepted for SMA6J18AHM3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J18AHM3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J18AHM3/5A?
SMA6J18AHM3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J18AHM3/5A 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 SMA6J18AHM3/5A?
For technical support, including SMA6J18AHM3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J18AHM3/5A requirements.
6.How does Aetrix verify that SMA6J18AHM3/5A is sourced from the original manufacturer or authorized distributors?
All SMA6J18AHM3/5A 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 SMA6J18AHM3/5A meets industry standards.
7.What is the process for return or replacement of SMA6J18AHM3/5A?
All SMA6J18AHM3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J18AHM3/5A, 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 SMA6J18AHM3/5A part is unused and in its original packaging.
Return procedure for SMA6J18AHM3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6J18AHM3/5A Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
