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Vishay General Semiconductor - Diodes Division SMA5J20AHM3/I
- Part No.:
- SMA5J20AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J20AHM3/I.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,232
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Product details
Overview
SMA5J20AHM3/I from Vishay General Semiconductor is a unidirectional 20 V stand-off transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, rated for 500 W peak pulse power, 32.4 V clamping voltage at 15.4 A surge current, and -55 °C to +150 °C operating junction temperature. It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients in automotive and industrial power electronics.
For engineers reviewing the SMA5J20AHM3/I datasheet, SMA5J20AHM3/I pinout, SMA5J20AHM3/I application, or SMA5J20AHM3/I equivalent, key selection criteria include its 20 V reverse stand-off voltage, 22.2–24.5 V breakdown range at 1 mA, 1.0 μA max reverse leakage at VWM, halogen-free RoHS-compliant construction, and AEC-Q101 qualification for automotive use.
Technical Context
This TVS diode operates as a unidirectional clamping device with a cathode-banded polarity marking, utilizing a glass-passivated silicon junction for stable avalanche behavior under 10/1000 μs surge waveforms. Its low incremental surge resistance and fast response time enable effective suppression of ESD and load-dump transients without parasitic turn-on.
The SMA5J20AHM3/I is thermally optimized for surface-mount PCB layouts using 0.2" × 0.2" copper pads per terminal, delivering 80 °C/W junction-to-ambient thermal resistance and supporting repetitive surge events within derated junction temperature limits up to 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 22.2 V / 24.5 V at 1 mA - Confirmed breakdown threshold ensures reliable triggering above system rail |
| VC @ IPPM | 32.4 V at 15.4 A - Clamping voltage defines worst-case overvoltage seen by protected circuitry |
| PPPM | 500 W - Peak pulse power rating for 10/1000 μs waveform determines transient energy handling capacity |
| IFSM | 40 A - Non-repetitive forward surge current rating supports inrush and fault-current events |
| TJ range | -55 °C to +150 °C - Extended junction temperature range enables deployment in under-hood automotive environments |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; polarity indicated by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point during clamping | Connected to system ground or lower-potential node; conducts during reverse-transient suppression |
| Cathode | Reverse-biased terminal during normal operation | Connected to protected line (e.g., 24 V rail or sensor input); initiates avalanche conduction when VWM exceeded |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per stress test requirements |
| Halogen-free & RoHS-compliant | Meets JEDEC JESD201 Class 2 whisker resistance and global environmental compliance mandates for Tier 1 supply chains |
| Low incremental surge resistance | Minimizes voltage overshoot during high-di/dt transients, improving clamping precision for sensitive 3.3 V/5 V logic interfaces |
| MSL Level 1 (260 °C) | Enables standard reflow assembly without moisture sensitivity concerns or bake-out requirements |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V CAN bus power rails and LIN transceivers from load-dump pulses up to 35 V during alternator regulation faults. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery feed and local regulator input to limit transient overvoltage before LDO stage. Use Value: 32.4 V clamping voltage ensures downstream 36 V-rated regulators remain within safe operating area during ISO 7637-2 Pulse 5a events. | Use Scenario: Safeguarding analog outputs of pressure/temperature sensors in PLC modules exposed to relay-coil flyback noise. IC Role / Device Role / Timing Role: Standoff protection on 4–20 mA current-loop transmitter output lines, shunting inductive kickback into ground path. Use Value: 20 V VWM aligns with typical loop-supply headroom while 500 W PPPM handles >100 mJ surges without degradation. |
| Consumer DC Power Adapter Input | Motor Drive Gate Driver Protection |
Use Scenario: Input-stage surge suppression on 19 V laptop adapter secondary side subjected to AC line-induced transients via shared ground paths. IC Role / Device Role / Timing Role: Primary TVS on DC output rail upstream of buck converter, absorbing coupled common-mode spikes from EMI filter leakage. Use Value: Fast response time (<1 ns) and low capacitance (<100 pF at 0 V) prevent signal distortion while maintaining EMC compliance. | Use Scenario: Clamping gate-source voltage of 600 V Si IGBTs in HVAC inverter stages during shoot-through fault recovery. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (cathode tied to gate, anode to source) limiting VGS excursion during Miller-induced oscillation. Use Value: 15.4 A IPPM rating matches typical gate driver short-circuit current capability, enabling robust fault energy absorption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J20AHE3_A/H | Same electrical specs; RoHS-compliant but not halogen-free; AEC-Q101 qualified; uses E3 suffix instead of HM3 | Acceptable for non-halogen-restricted automotive programs; same thermal and clamping performance | Select when halogen-free requirement is waived but AEC-Q101 validation is mandatory |
| SMA5J20A-M3/61 | Identical VWM, VBR, VC, and PPPM; halogen-free RoHS-compliant; not AEC-Q101 qualified; commercial-grade only | Suitable for industrial/commercial systems where automotive qualification is unnecessary | Choose for cost-sensitive non-automotive designs requiring halogen-free compliance without extended reliability testing |
Compared with SMA5J20AHM3/I, SMA5J20AHE3_A/H offers identical automotive qualification but lacks halogen-free status, while SMA5J20A-M3/61 provides halogen-free compliance at commercial-grade reliability-making SMA5J20AHM3/I the sole option meeting both AEC-Q101 and halogen-free mandates simultaneously.
Availability
SMA5J20AHM3/I is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, consumer DC power adapter input, and motor drive gate driver protection requiring stable component supply across production lifecycles.
Supply support for SMA5J20AHM3/I 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, MOSFETs, and TVS devices with emphasis on high-reliability, high-power-density solutions.
The SMA5J series is designed specifically for high-energy transient suppression in space-constrained automotive and industrial applications, combining AEC-Q101 qualification, halogen-free materials, and industry-standard DO-214AC packaging.
FAQ
What is the clamping voltage of the SMA5J20AHM3/I under maximum surge conditions?
The SMA5J20AHM3/I has a maximum clamping voltage (VC) of 32.4 V at 15.4 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuits during transient events. The SMA5J20AHM3/I maintains this clamping performance across its full operating temperature range and is validated per ANSI/IEEE C62.35 standards.
Is the SMA5J20AHM3/I qualified for automotive applications?
Yes, the SMA5J20AHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88875. It undergoes stress testing for temperature cycling, humidity bias, mechanical shock, and high-temperature operating life per AEC-Q101 requirements. This qualification makes the SMA5J20AHM3/I suitable for under-hood and chassis-mounted automotive electronics where reliability under harsh environmental conditions is critical.
What does the "HM3" suffix indicate in SMA5J20AHM3/I?
The "HM3" suffix in SMA5J20AHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. "H" indicates AEC-Q101 qualification, "M3" specifies halogen-free and RoHS-compliant materials per JEDEC JESD201 Class 2 whisker resistance. This distinguishes it from E3 (RoHS only) and HE3 (AEC-Q101 + RoHS, not halogen-free) variants. The SMA5J20AHM3/I meets both automotive reliability and green manufacturing mandates.
What is the thermal resistance of the SMA5J20AHM3/I in standard mounting conditions?
The SMA5J20AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, per datasheet 88875. This value assumes standard FR-4 PCB layout and natural convection cooling. For higher power dissipation or elevated ambient temperatures, thermal design must account for derating curves shown in Figure 2 of the datasheet to maintain TJ ≤ 150 °C.
How does the SMA5J20AHM3/I compare to bidirectional TVS diodes like SMA5J20CA?
The SMA5J20AHM3/I is unidirectional and intended for DC line protection with defined polarity (cathode band), whereas SMA5J20CA is bidirectional and used in AC or symmetrical signal-line applications. SMA5J20AHM3/I has a 20 V stand-off voltage and clamps only in reverse bias; SMA5J20CA clamps equally in both directions with ~20 V symmetric VWM. Their electrical parameters differ-SMA5J20CA has higher ID leakage and different VBR tolerance-and they are not interchangeable without circuit redesign.
SMA5J20AHM3/I 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 15.4A
- Power - Peak Pulse:
- 500W
- 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)
SMA5J20AHM3/I FAQ
1.How can I place an order for SMA5J20AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J20AHM3/I 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 SMA5J20AHM3/I reliable?
The price and inventory of SMA5J20AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J20AHM3/I is usually 5 days.
3.What payment methods are accepted for SMA5J20AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J20AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J20AHM3/I?
SMA5J20AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J20AHM3/I 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 SMA5J20AHM3/I?
For technical support, including SMA5J20AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J20AHM3/I requirements.
6.How does Aetrix verify that SMA5J20AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMA5J20AHM3/I 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 SMA5J20AHM3/I meets industry standards.
7.What is the process for return or replacement of SMA5J20AHM3/I?
All SMA5J20AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J20AHM3/I, 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 SMA5J20AHM3/I part is unused and in its original packaging.
Return procedure for SMA5J20AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA5J20AHM3/I Tags
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