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Vishay General Semiconductor - Diodes Division SMP20A-M3/84A
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- Part No.:
- SMP20A-M3/84A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-220AA
- Datasheet:
-
SMP20A-M3/84A.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO220AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SMP20A-M3/84A from Vishay General Semiconductor is a unidirectional surface-mount TransZORB® transient voltage suppressor in the SMP (DO-220AA) package, rated for 400 W peak pulse power (10/1000 μs), 20 V stand-off voltage, and 32.4 V maximum clamping voltage at 12.3 A peak pulse current. It protects sensitive ICs and MOSFETs against inductive switching transients in industrial and telecom power rails.
For engineers reviewing the SMP20A-M3/84A datasheet, SMP20A-M3/84A pinout, SMP20A-M3/84A application, or SMP20A-M3/84A equivalent, key selection criteria include clamping voltage margin vs. protected device VDS/VCC, IPPM derating above 25 °C, unidirectional polarity alignment with DC bias, and MSL Level 1 reflow compatibility.
Technical Context
This TVS diode operates as a unidirectional clamping device with a breakdown voltage range of 22.2–24.5 V at 1.0 mA test current, ensuring reliable turn-on before system overvoltage damage occurs. Its low 50 °C/W junction-to-lead thermal resistance supports sustained surge handling when mounted on 5.0 mm × 5.0 mm copper pads per terminal.
The device exhibits fast response time and low incremental surge resistance, enabling effective suppression of sub-microsecond transients induced by relay switching or motor commutation. It meets J-STD-020 MSL Level 1 with 260 °C peak reflow profile and is halogen-free, RoHS-compliant, and qualified to JESD 201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 400 W - sustains single high-energy surges without failure under standard waveform conditions |
| Stand-off Voltage (VWM) | 20 V - maximum continuous reverse voltage before significant leakage; sets upper limit for normal operating bias |
| Breakdown Voltage (VBR) | 22.2–24.5 V at 1.0 mA - defines precise turn-on threshold for transient clamping |
| Clamping Voltage (VC) | 32.4 V at 12.3 A - actual voltage seen by protected circuit during worst-case surge event |
| Peak Pulse Current (IPPM) | 12.3 A - maximum non-repetitive surge current the device can safely divert |
| Operating Temperature | –55 °C to +150 °C - enables use in automotive under-hood and industrial control environments |
| Thermal Resistance (Junction-to-Lead) | 50 °C/W - allows efficient heat transfer to PCB copper, critical for repeated surge duty cycles |
Pinout & Package
Package: SMP (DO-220AA), ultra-low-profile surface-mount case with matte tin-plated leads; 1.0 mm typical height; cathode denoted by color band; M3 suffix indicates halogen-free, RoHS-compliant, industrial-grade construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction; connected to system ground or low-side reference | Must be tied to lowest potential node in protected path to enable proper clamping action |
| Cathode | Current exit point during reverse-biased clamping; connected to protected line (e.g., 20 V rail) | Color band identifies this terminal; polarity must match DC bias direction to avoid forward conduction |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 4 surges without derating in compact layouts |
| Unidirectional configuration | Prevents unwanted conduction on negative-going transients while maintaining DC blocking integrity |
| MSL Level 1 moisture sensitivity | Eliminates bake-out requirement prior to reflow, reducing manufacturing cost and cycle time |
| Low 1.0 μA max reverse leakage at VWM | Minimizes standby power loss and avoids false triggering in battery-powered sensor nodes |
| DO-220AA footprint | Offers 30 % smaller board area vs. SMA while retaining comparable surge capability |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of gate drivers and bootstrap circuits against flyback spikes from IGBT/MOSFET switching in variable-frequency drives. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed across DC bus or gate-source terminals to limit voltage overshoot. Use Value: Clamps transients to ≤32.4 V, preventing gate oxide rupture in 25 V-rated drivers and ensuring >2.6 V safety margin below absolute max ratings. |
Use Scenario: Input-stage surge suppression on 24 V/48 V telecom rectifier outputs exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS on secondary-side DC output rails upstream of POL converters and monitoring ICs. Use Value: Absorbs 400 W pulses without degradation, maintaining <1.0 μA leakage at 20 V nominal, preserving efficiency in always-on systems. |
| Automotive Body Control Modules | Industrial PLC I/O Modules |
Use Scenario: Protection of LIN bus transceivers and microcontroller I/O pins against load dump and inductive kickback in 12 V systems. IC Role / Device Role / Timing Role: Localized TVS on each protected signal line, placed adjacent to connector entry points. Use Value: Fast response and low clamping voltage ensure MCU GPIOs remain within ±0.3 V of supply rail during 100 ns transients. |
Use Scenario: Field-side protection of analog input channels (4–20 mA, 0–10 V) against ESD and wiring faults in factory automation controllers. IC Role / Device Role / Timing Role: Series-connected TVS on signal lines entering precision ADC front-ends. Use Value: 32.4 V clamping prevents saturation of 24 V-powered op-amps and preserves 16-bit measurement accuracy under surge stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMP20A-M3/85A | Identical electrical specs; differs only in packaging-10,000-unit 13" tape-and-reel vs. 3,000-unit 7" reel | No functional difference; selected based on production volume and SMT line feeder compatibility | Choose /85A for high-volume automated assembly requiring longer reel lengths and reduced changeover frequency |
| SMAJ20A | Same VWM (20 V) and VC (32.4 V), but larger SMA package (2.5 mm height), higher RθJA (350 °C/W), and lower IPPM (12.1 A) | Less suitable for ultra-thin designs or high-density layouts where 1.0 mm height is mandatory | Select SMAJ20A only if legacy board space or thermal mass permits larger footprint and higher thermal impedance |
Compared with SMP20A-M3/84A, the /85A variant offers identical protection performance with optimized logistics for volume production, while SMAJ20A trades board-area efficiency and thermal performance for broader distributor availability and legacy design reuse.
Availability
SMP20A-M3/84A is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and automotive body control modules requiring stable component supply, consistent MSL Level 1 compliance, and verified unidirectional clamping behavior.
Supply support for SMP20A-M3/84A 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, and transient protection devices with emphasis on reliability, power density, and application-specific qualification.
The SMP series was engineered for space-constrained, high-surge industrial and automotive systems where low-profile mounting, repeatable clamping, and no-bake reflow are mandatory design requirements.
FAQ
What is the maximum clamping voltage of SMP20A-M3/84A at its rated peak pulse current?
The SMP20A-M3/84A has a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current of 12.3 A using the 10/1000 μs waveform. This value is measured under standardized test conditions with 5.0 mm × 5.0 mm copper pads per terminal and represents the highest voltage the protected circuit will experience during a full-rated surge event. Designers must verify that this clamping level remains below the absolute maximum rating of downstream components.
Is SMP20A-M3/84A suitable for bidirectional transient protection?
No, SMP20A-M3/84A is a unidirectional TVS diode and is not suitable for bidirectional protection. Its design provides clamping only for positive transients relative to the cathode terminal; negative excursions will forward-conduct and may fail catastrophically. For bidirectional applications such as AC lines or differential data buses, a dedicated bidirectional part like SMBJ20CA or an external bridge configuration is required. The SMP20A-M3/84A datasheet explicitly specifies unidirectional polarity.
What does the "M3/84A" suffix indicate in SMP20A-M3/84A?
The "M3" suffix denotes halogen-free, RoHS-compliant construction meeting JESD 201 Class 2 whisker resistance, while "84A" specifies the packaging format: 7-inch diameter plastic tape-and-reel containing 3,000 units. This ordering code ensures traceability to Vishay's qualified industrial-grade manufacturing flow and confirms compliance with lead-free reflow profiles up to 260 °C peak temperature. The full part number SMP20A-M3/84A uniquely identifies this configuration in Vishay's documentation and distribution channels.
How does the thermal resistance of SMP20A-M3/84A affect its surge handling capability?
The SMP20A-M3/84A has a typical junction-to-lead thermal resistance (RθJL) of 50 °C/W, which directly governs how effectively heat from surge events transfers to the PCB copper. When mounted per recommended pad layout (5.0 mm × 5.0 mm pads), this low RθJL enables rapid dissipation of transient energy, allowing the device to sustain multiple surges without thermal runaway. Higher RθJL values would reduce safe repetition rate and require larger copper areas to maintain junction temperature below 150 °C.
Can SMP20A-M3/84A be used in place of SMP18A-M3/84A without redesigning the PCB?
No - although both share the same SMP (DO-220AA) package and pinout, SMP20A-M3/84A has a higher stand-off voltage (20 V vs. 18 V) and clamping voltage (32.4 V vs. 29.2 V), which may exceed the voltage tolerance of circuits designed for SMP18A-M3/84A. Substitution requires verification that all protected components can withstand the increased clamping level and that the higher VBR does not delay turn-on during marginal transients. The SMP20A-M3/84A is not a drop-in replacement for SMP18A-M3/84A without system-level validation.
SMP20A-M3/84A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-220AA
- Series:
- TransZorb®, eSMP®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 12.3A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-220AA (SMP)
SMP20A-M3/84A FAQ
1.How can I place an order for SMP20A-M3/84A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMP20A-M3/84A 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 SMP20A-M3/84A reliable?
The price and inventory of SMP20A-M3/84A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMP20A-M3/84A is usually 5 days.
3.What payment methods are accepted for SMP20A-M3/84A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMP20A-M3/84A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMP20A-M3/84A?
SMP20A-M3/84A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMP20A-M3/84A 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 SMP20A-M3/84A?
For technical support, including SMP20A-M3/84A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMP20A-M3/84A requirements.
6.How does Aetrix verify that SMP20A-M3/84A is sourced from the original manufacturer or authorized distributors?
All SMP20A-M3/84A 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 SMP20A-M3/84A meets industry standards.
7.What is the process for return or replacement of SMP20A-M3/84A?
All SMP20A-M3/84A units undergo pre-shipment inspection (PSI). If there is an issue with SMP20A-M3/84A, 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 SMP20A-M3/84A part is unused and in its original packaging.
Return procedure for SMP20A-M3/84A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMP20A-M3/84A Tags
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