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Vishay General Semiconductor - Diodes Division SMP12A-M3/85A
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- Part No.:
- SMP12A-M3/85A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-220AA
- Datasheet:
-
SMP12A-M3/85A.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO220AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,997
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Product details
Overview
SMP12A-M3/85A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in the eSMP® Series, designed for clamping voltage transients on power and signal lines. It features a 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown voltage (VBR), 400 W peak pulse power (10/1000 μs), 20.1 A peak pulse current (IPPM), and 19.9 V maximum clamping voltage (VC) at rated surge current - deployed in consumer, industrial, and telecom electronics for IC and MOSFET protection.
For engineers reviewing the SMP12A-M3/85A datasheet, SMP12A-M3/85A pinout, SMP12A-M3/85A application, or SMP12A-M3/85A equivalent, key selection criteria include unidirectional polarity, DO-220AA package compatibility, 1.0 mm profile for space-constrained PCBs, MSL Level 1 rating, and verified 400 W surge capability per JEDEC standards.
Technical Context
This TVS diode operates as a fast-acting shunt clamp during overvoltage events, with sub-nanosecond response time and low incremental surge resistance to minimize voltage overshoot. Its unidirectional configuration provides reverse-biased transient suppression while allowing forward conduction up to 2.5 V at 25 A.
Thermal performance is defined by 50 °C/W junction-to-lead and 250 °C/W junction-to-ambient thermal resistance, requiring minimum 5.0 mm × 5.0 mm copper pads per terminal for rated 400 W pulse handling. The device is rated for continuous operation from –55 °C to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum reverse working voltage before clamping begins; sets operating margin for protected circuitry. |
| VBR min/max | 13.3 V / 14.7 V - breakdown occurs within this range at 1 mA test current; defines turn-on threshold consistency. |
| VC @ IPPM | 19.9 V - clamped voltage at 20.1 A peak pulse; determines worst-case stress on downstream components. |
| PPPM | 400 W - peak pulse power handling with 10/1000 μs waveform; validates robustness against IEC 61000-4-5 surges. |
| IFSM | 40 A - non-repetitive forward surge current (10 ms half-sine); supports inrush or fault-current tolerance. |
| TJ max | +150 °C - maximum junction temperature; enables use in high-ambient industrial environments with proper layout. |
Pinout & Package
Package: SMP (DO-220AA), surface-mount, halogen-free, RoHS-compliant, MSL Level 1, 1.0 mm typical height, matte tin-plated leads, cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance return in unidirectional clamp configuration. |
| Cathode | Clamping node / protected line connection | Connected to line under protection; conducts during reverse overvoltage to clamp to VC. |
Key Features
| Feature | Design Value |
|---|---|
| Very low profile (1.0 mm) | Enables integration into ultra-thin portable and automotive modules without height interference. |
| 400 W peak pulse power (10/1000 μs) | Meets IEC 61000-4-5 Level 3 surge immunity requirements for industrial interfaces. |
| Low incremental surge resistance | Minimizes dynamic voltage overshoot during fast-rising transients (<1 ns rise time). |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly without preconditioning or special handling. |
Applications
| USB Power Delivery Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protects USB-C VBUS line from ESD and load-dump induced transients during hot-plug and adapter switching. IC Role / Device Role: Unidirectional shunt TVS placed between VBUS and chassis ground. Use Value: Clamps to ≤19.9 V at 20.1 A, preventing damage to USB PD controller and port protection ICs rated ≤20 V. |
Use Scenario: Shields LIN bus transceivers and microcontroller I/O pins from inductive switching spikes in door lock actuators. IC Role / Device Role: Localized transient suppressor mounted directly at connector entry point. Use Value: Responds in <1 ns to 100 V/μs edges, limiting voltage seen by 5 V logic to safe levels per ISO 7637-2 Pulse 1/2a. |
| Industrial PLC Digital Input Card | Telecom Base Station Sensor Interface |
|
Use Scenario: Guards 24 V DC digital input channels against field-wiring induced surges and relay contact bounce. IC Role / Device Role: Primary overvoltage clamp on each channel's input node before signal conditioning. Use Value: Handles repeated 400 W pulses without degradation, supporting >100,000 surge cycles in factory automation environments. |
Use Scenario: Safeguards analog sensor inputs (e.g., temperature, humidity) connected to remote radio units exposed to lightning-induced coupling. IC Role / Device Role: First-stage protection on differential sensor lines prior to instrumentation amplifier. Use Value: 19.9 V clamping ensures sensor signal chain remains within ADC input range despite ±1 kV common-mode transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMP12A-M3/84A | Same electrical specs; differs only in packaging - 3000-piece 7" tape vs. 10,000-piece 13" tape. | Identical functional use; selected for smaller batch prototyping or lower inventory turnover. | Choose when reel size or base quantity aligns with production planning or evaluation needs. |
| SMAJ12A | DO-214AC package (higher profile: 2.3 mm), 400 W rating, VWM = 12 V, VC = 19.9 V - same clamping but larger footprint and thermal resistance. | Used where board space allows larger package and higher RθJA (350 °C/W) is acceptable. | Select if legacy SMA layout exists or thermal derating margins permit higher ambient operation. |
Compared with SMP12A-M3/85A, the /84A variant offers identical protection performance in a smaller reel format ideal for NPI, while SMAJ12A delivers equivalent clamping in a less space-efficient package with reduced thermal efficiency - making SMP12A-M3/85A optimal for high-density, thermally constrained designs.
Availability
SMP12A-M3/85A is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, and telecom sensor interfaces requiring stable component supply, long-term lifecycle support, and consistent MSL Level 1 compliance.
Supply support for SMP12A-M3/85A 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 protection devices with emphasis on reliability, precision, and application-specific optimization.
The eSMP® Series, including SMP12A-M3/85A, was engineered for high-efficiency transient suppression in space-constrained, high-reliability applications across automotive, industrial, and communications markets.
FAQ
What is the clamping voltage of SMP12A-M3/85A at its rated peak pulse current?
The SMP12A-M3/85A exhibits a maximum clamping voltage (VC) of 19.9 V when subjected to its rated peak pulse current (IPPM) of 20.1 A using a 10/1000 μs waveform. This value is measured under standardized test conditions with 5.0 mm × 5.0 mm copper pads per terminal and defines the upper voltage limit imposed on protected circuitry during surge events.
Is SMP12A-M3/85A suitable for bidirectional transient protection?
No - SMP12A-M3/85A is a unidirectional TVS diode, intended for suppression of reverse-polarity transients only. It conducts in reverse bias above VBR and blocks forward current up to 2.5 V at 25 A. For bidirectional protection, a symmetric device such as SMBJ12CA or an external series diode configuration would be required.
What does the "/85A" suffix indicate in SMP12A-M3/85A?
The "/85A" suffix denotes the preferred packaging option: 13-inch diameter plastic tape and reel containing 10,000 units. This contrasts with "/84A", which specifies a 7-inch reel of 3,000 units. Both share identical electrical, thermal, and mechanical characteristics - only the reel size and quantity differ.
Does SMP12A-M3/85A meet RoHS and halogen-free requirements?
Yes - SMP12A-M3/85A carries the "M3" suffix, confirming it is halogen-free, RoHS-compliant, and qualified to industrial grade standards. The molding compound meets UL 94 V-0 flammability rating, and terminals are matte tin plated per J-STD-002 and JESD 22-B102.
How does the thermal resistance of SMP12A-M3/85A affect PCB layout?
SMP12A-M3/85A has a typical junction-to-ambient thermal resistance (RθJA) of 250 °C/W, which requires adherence to the recommended 5.0 mm × 5.0 mm copper pad area per terminal to achieve rated 400 W pulse performance. Reducing pad size increases thermal impedance and necessitates derating per Figure 2 in the datasheet to avoid junction overheating.
SMP12A-M3/85A 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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 20.1A
- 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)
SMP12A-M3/85A FAQ
1.How can I place an order for SMP12A-M3/85A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMP12A-M3/85A 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 SMP12A-M3/85A reliable?
The price and inventory of SMP12A-M3/85A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMP12A-M3/85A is usually 5 days.
3.What payment methods are accepted for SMP12A-M3/85A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMP12A-M3/85A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMP12A-M3/85A?
SMP12A-M3/85A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMP12A-M3/85A 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 SMP12A-M3/85A?
For technical support, including SMP12A-M3/85A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMP12A-M3/85A requirements.
6.How does Aetrix verify that SMP12A-M3/85A is sourced from the original manufacturer or authorized distributors?
All SMP12A-M3/85A 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 SMP12A-M3/85A meets industry standards.
7.What is the process for return or replacement of SMP12A-M3/85A?
All SMP12A-M3/85A units undergo pre-shipment inspection (PSI). If there is an issue with SMP12A-M3/85A, 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 SMP12A-M3/85A part is unused and in its original packaging.
Return procedure for SMP12A-M3/85A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMP12A-M3/85A Tags
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