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Vishay General Semiconductor - Diodes Division SMPC28AN-M3/H
- Part No.:
- SMPC28AN-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- TO-277, 3-PowerDFN
- Datasheet:
-
SMPC28AN-M3/H.pdf
- Description:
- TVS DIODE 28VWM 45.4VC TO277A
- Quantity:
- Payment:
- Shipping:
Inventory:5,685
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Product details
Overview
SMPC28AN-M3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in the SMPC (TO-277A) package, designed for robust clamping of voltage transients on power and signal lines. It features a 28.0 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR), 45.4 V maximum clamping voltage (VC) at 33.0 A peak pulse current, and 1500 W peak pulse power (10/1000 μs). It is widely used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial control systems.
For engineers reviewing the SMPC28AN-M3/H datasheet, SMPC28AN-M3/H pinout, SMPC28AN-M3/H application, or SMPC28AN-M3/H equivalent, key selection criteria include unidirectional polarity, 1.1 mm profile for space-constrained PCB layouts, AEC-Q101 qualification status (via HM3 suffix), thermal resistance (RθJA ≤ 100 °C/W), and compatibility with automated SMT placement per J-STD-002.
Technical Context
This TVS diode operates as a unidirectional clamp, conducting only when reverse-biased beyond its breakdown threshold. Its low incremental surge resistance and fast response time enable effective suppression of inductive switching spikes and ESD events without affecting normal circuit operation below VWM = 28.0 V.
The device uses a planar junction structure in an SMPC (TO-277A) package with dual anodes and a common cathode - confirmed by the eSMP® Series pin diagram. Thermal performance is characterized per JEDEC 51-2A (RθJA) and 51-14 (RθJM), supporting reliable operation up to TJ = 150 °C with derating above TA = 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28.0 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin for protected circuits. |
| VBR min/max | 31.1 V / 34.4 V at IT = 1.0 mA - Confirmed breakdown range ensures predictable turn-on behavior under transient stress. |
| VC @ IPPM | 45.4 V at 33.0 A (10/1000 μs) - Clamping voltage limits downstream component stress during surge events. |
| PPPM | 1500 W - Peak pulse power handling capacity determines survivability against standardized lightning/surge waveforms. |
| RθJA | ≤ 100 °C/W - Junction-to-ambient thermal resistance on FR4 PCB with 2 oz copper defines required board-level thermal management. |
| Polarity | Unidirectional - Requires correct orientation (cathode band marked) to protect against negative-going transients only. |
| Package | SMPC (TO-277A) - Surface-mount, low-profile (1.1 mm height), dual-anode/common-cathode configuration for high-current routing. |
Pinout & Package
SMPC28AN-M3/H uses the SMPC (TO-277A) package: a 3-terminal surface-mount outline conforming to JEDEC TO-277A, with 1.1 mm typical height, matte tin-plated leads, and cathode band marking. The package supports automated placement and meets MSL Level 1 (260 °C reflow peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode 1 | Primary current path anode | Connected to protected line (e.g., power rail or signal trace); shares cathode with Anode 2 for parallel conduction capability. |
| Anode 2 | Secondary current path anode | Enables higher surge current sharing; both anodes conduct simultaneously during clamping to reduce localized heating. |
| Cathode | Common clamping node | Connected to ground or low-impedance return path; marked by visible band; carries full IPPM during transient event. |
Key Features
| Feature | Design Value |
|---|---|
| Very low profile (1.1 mm) | Enables use in ultra-thin consumer and automotive ECUs where Z-height is constrained by mechanical housing or shielding. |
| Unidirectional clamping | Prevents false triggering on positive DC bias while providing precise protection against negative transients on power/signal lines. |
| AEC-Q101 qualified option | SMPC28AN-M3/H is industrial grade; AEC-Q101 version requires HM3 suffix (e.g., SMPC28ANHM3/H), validated for automotive underhood environments. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a), improving system immunity margin. |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for global electronics manufacturing without compromising surge performance. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs in engine control units against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between VCC and GND to limit transient overvoltage to ≤45.4 V during ISO 16750-2 load dump events. Use Value: Prevents latch-up or permanent damage to MCU supply pins by clamping within 1 ns while sustaining 1500 W peak power. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) of pressure sensors exposed to ESD and inductive coupling in factory automation. IC Role / Device Role / Timing Role: Bidirectional protection not required; unidirectional SMPC28AN-M3/H placed across signal and return to suppress negative transients induced by relay switching. Use Value: Maintains signal integrity below 28.0 V stand-off while limiting clamping voltage to 45.4 V, preserving ADC input range and avoiding saturation. |
| Telecom DC Power Interface | Consumer Device USB Port Protection |
|
Use Scenario: Shielding 24 V DC input ports of PoE-powered network switches from surges caused by nearby lightning-induced ground potential rise. IC Role / Device Role / Timing Role: Primary front-end TVS on main DC input, coordinated with upstream fuse and downstream DC-DC converter input capacitance. Use Value: Absorbs 1500 W pulses without degradation, enabling compliance with IEC 61000-4-5 Level 4 (4 kV line-earth) when combined with appropriate layout. |
Use Scenario: Adding secondary-level surge protection on VBUS line of USB-C ports in portable monitors to supplement internal port controller ESD diodes. IC Role / Device Role / Timing Role: Standoff voltage (28.0 V) exceeds USB 3.1 VBUS max (20 V), ensuring no interference during normal operation while clamping >28 V faults. Use Value: 1.1 mm height allows placement adjacent to USB connector without interfering with mating height; matte tin terminations ensure solder joint reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-M3/86A | Same VWM (28 V), but SMA package (higher RθJA ≈ 140 °C/W), lower PPPM (400 W), single-anode construction. | Limited to lower-energy transients; less suitable for automotive load dump or industrial 1500 W surge standards. | Select SMAJ28A-M3/86A only if board space allows larger footprint and thermal budget permits higher junction temperature rise. |
| SMCJ28A-M3/86A | Same VWM (28 V), DO-214AB package, higher RθJA (~105 °C/W), same 1500 W PPPM, but single-anode topology. | Lower current sharing capability vs. dual-anode SMPC28AN-M3/H; may exhibit higher localized heating under repeated surges. | Choose SMCJ28A-M3/86A when legacy DO-214AB footprint is fixed, but expect reduced long-term reliability in high-cycle surge environments. |
Compared with SMAJ28A-M3/86A and SMCJ28A-M3/86A, SMPC28AN-M3/H delivers superior thermal performance via dual-anode current sharing and lower-profile mounting - critical for automotive and dense industrial PCBs where Z-height and thermal density are constrained.
Availability
SMPC28AN-M3/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface design, and telecom DC input hardening requiring stable component supply and consistent surge performance across production batches.
Supply support for SMPC28AN-M3/H 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, efficiency, and application-specific optimization.
The SMPC series was developed to address demand for low-profile, high-power TVS solutions in automotive and industrial applications - delivering 1500 W surge capability in a 1.1 mm height package with AEC-Q101-qualified variants.
FAQ
What is the polarity configuration of SMPC28AN-M3/H?
SMPC28AN-M3/H is a unidirectional TVS diode with dual anodes and a common cathode, as shown in the eSMP® Series pin diagram. The cathode is marked by a band on the package body. This configuration enables high-current surge handling while maintaining low clamping voltage - critical for protecting sensitive components on DC power rails where only negative-going transients require suppression.
Is SMPC28AN-M3/H AEC-Q101 qualified?
No - SMPC28AN-M3/H carries the industrial-grade M3 suffix. For AEC-Q101 qualification, the part must use the HM3 suffix (e.g., SMPC28ANHM3/H), which is explicitly listed in the ordering table and qualified for automotive underhood applications per AEC-Q101 Rev H. Always verify suffix and datasheet revision when selecting for automotive use.
What is the maximum clamping voltage of SMPC28AN-M3/H at rated surge current?
The maximum clamping voltage (VC) of SMPC28AN-M3/H is 45.4 V at 33.0 A peak pulse current (10/1000 μs waveform), as specified in the Electrical Characteristics table. This value defines the upper voltage limit imposed on protected circuitry during worst-case transient events and must be compared against the absolute maximum ratings of downstream ICs.
Can SMPC28AN-M3/H be used in bidirectional protection circuits?
No - SMPC28AN-M3/H is strictly unidirectional and conducts only when reverse-biased beyond its breakdown voltage. For bidirectional protection (e.g., AC lines or differential signals), a separate bidirectional TVS such as SMBJ28CA-M3/86A or a back-to-back unidirectional pair would be required. Using SMPC28AN-M3/H in reverse-bias-only configurations avoids unintended conduction during normal operation.
What is the thermal resistance specification for SMPC28AN-M3/H on standard FR4 PCB?
SMPC28AN-M3/H has a maximum junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on a standard FR4 PCB with 2 oz copper and the recommended pad layout per the datasheet. This value assumes no additional heatsinking and must be applied with derating curves (Fig. 2) when ambient temperature exceeds 25 °C to ensure TJ remains ≤150 °C.
SMPC28AN-M3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- TO-277, 3-PowerDFN
- Series:
- TransZorb®, eSMP®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 33A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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:
- TO-277A (SMPC)
SMPC28AN-M3/H FAQ
1.How can I place an order for SMPC28AN-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMPC28AN-M3/H 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 SMPC28AN-M3/H reliable?
The price and inventory of SMPC28AN-M3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMPC28AN-M3/H is usually 5 days.
3.What payment methods are accepted for SMPC28AN-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMPC28AN-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMPC28AN-M3/H?
SMPC28AN-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMPC28AN-M3/H 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 SMPC28AN-M3/H?
For technical support, including SMPC28AN-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMPC28AN-M3/H requirements.
6.How does Aetrix verify that SMPC28AN-M3/H is sourced from the original manufacturer or authorized distributors?
All SMPC28AN-M3/H 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 SMPC28AN-M3/H meets industry standards.
7.What is the process for return or replacement of SMPC28AN-M3/H?
All SMPC28AN-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMPC28AN-M3/H, 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 SMPC28AN-M3/H part is unused and in its original packaging.
Return procedure for SMPC28AN-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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