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Vishay General Semiconductor - Diodes Division SMPC85AN-M3/I
- Part No.:
- SMPC85AN-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- TO-277, 3-PowerDFN
- Datasheet:
-
SMPC85AN-M3/I.pdf
- Description:
- TVS DIODE 85VWM 137VC TO277A
- Quantity:
- Payment:
- Shipping:
Inventory:3,150
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Product details
Overview
SMPC85AN-M3/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in the SMPC (TO-277A) package, designed for high-energy surge protection of sensitive electronics. It features a 85 V stand-off voltage (VWM), 94.4–104 V breakdown voltage (VBR), 1500 W peak pulse power (PPPM), 10.9 A peak pulse current (IPPM), and clamps to 137 V at rated surge - ideal for protecting automotive sensor signal lines and industrial I/O interfaces against inductive switching transients.
For engineers reviewing the SMPC85AN-M3/I datasheet, SMPC85AN-M3/I pinout, SMPC85AN-M3/I application, or SMPC85AN-M3/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification (via HM3 suffix variants), MSL Level 1 moisture sensitivity, and thermal resistance RθJA ≤ 100 °C/W on FR4 PCB - all critical for automotive-grade board-level ESD and surge resilience validation.
Technical Context
This TVS diode operates as a clamping device that remains non-conductive below its 85 V stand-off voltage and rapidly transitions to low-impedance conduction when transient voltages exceed its 94.4–104 V breakdown range. Its unidirectional configuration enables protection of DC-biased signal or power rails where reverse polarity is not expected.
The SMPC85AN-M3/I uses a silicon avalanche junction optimized for fast response (< 1 ns) and low incremental surge resistance, delivering consistent clamping performance under 10/1000 μs surge waveforms. Its TO-277A package supports automated placement and provides thermal path optimization via cathode-side mounting - validated by RθJM ≤ 3 °C/W per JEDEC 51-14 TDIM testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC bias margin for protected line. |
| VBR min/max | 94.4 V / 104 V at 1 mA test current - specifies guaranteed avalanche onset window for predictable clamping threshold. |
| VC at IPPM | 137 V - clamped voltage during 10.9 A, 10/1000 μs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 1500 W - peak pulse power handling capability under standard 10/1000 μs waveform; defines single-event surge energy capacity. |
| RθJA | ≤ 100 °C/W - junction-to-ambient thermal resistance on FR4 with 2 oz copper; sets power derating limit above 25 °C ambient. |
| Polarity | Unidirectional - protects only positive-going transients on cathode-grounded configurations; requires correct orientation in circuit. |
| MSL Level | Level 1 per J-STD-020 - no floor life limitation; supports standard reflow without dry-pack or baking requirements. |
Pinout & Package
Package: SMPC (TO-277A), surface-mount, 3-terminal configuration with cathode band marking. Dimensions: 4.80 × 3.70 × 1.10 mm (L × W × H), compliant with JEDEC TO-277A outline. Matte tin-plated leads meet J-STD-002 solderability and JESD22-B102 whisker resistance Class 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode 1 & Anode 2 | Parallel anode connections | Internally tied anodes provide dual-path current sharing to reduce effective surge resistance and improve thermal distribution. |
| Cathode | Common cathode terminal | Single cathode node serves as reference/ground connection; marked by band; must be connected to system ground or lowest potential rail. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile height | 1.1 mm typical - enables use in space-constrained automotive ECUs and portable industrial sensors without mechanical interference. |
| AEC-Q101 qualified variant | HM3 suffix versions available - certified for automotive applications including engine control, ADAS sensor interfaces, and body electronics. |
| Halogen-free & RoHS-compliant | M3 suffix - meets environmental compliance for industrial and consumer end equipment without compromising surge robustness. |
| Fast response time | < 1 ns - ensures clamping activation prior to damage threshold of protected MOSFETs, microcontrollers, or CAN transceivers. |
| Low incremental surge resistance | Enables tighter VC-VBR margin - reduces overshoot during fast-rising transients like ISO 7637-2 Pulse 1/2a/5a. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting LIN/CAN bus nodes and analog sensor outputs (e.g., pressure, temperature) in engine bay modules exposed to load dump and inductive kick. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between signal line and chassis ground to shunt surge energy away from MCU input pins and level-shifter ICs. Use Value: Clamps 137 V at 10.9 A while maintaining 85 V stand-off - preserves signal integrity during 12 V system operation and withstands ISO 16750-2 load dump surges. |
Use Scenario: Safeguarding PLC digital input channels and RS-485 transceiver data lines against field-induced transients in factory automation systems. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input rails and differential data pairs, mounted directly at connector entry point. Use Value: 1500 W PPPM rating handles repetitive 10/1000 μs surges per IEC 61000-4-5 Level 3, enabling reliable operation in electrically noisy plant environments. |
| Power Supply Input Protection | Consumer Device Port Protection |
Use Scenario: Secondary surge suppression on DC input stage of industrial power supplies after primary MOV or gas discharge tube. IC Role / Device Role / Timing Role: Fast-acting secondary clamp limiting residual voltage to < 140 V during high-energy events, protecting downstream rectifiers and PWM controllers. Use Value: Low RθJA (≤100 °C/W) and 1.25 W steady-state PD allow sustained operation under elevated ambient temperatures up to +105 °C. |
Use Scenario: ESD and surge protection on USB-C or HDMI port power pins in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Unidirectional TVS on VBUS line to suppress contact discharge (IEC 61000-4-2 ±15 kV) and cable discharge events. Use Value: 1.1 mm profile fits tight board spacing near connectors; MSL Level 1 eliminates pre-reflow handling constraints in high-volume SMT lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85A-E3/5A (Vishay) | DO-214AC package; lower PPPM (400 W); higher RθJA (~150 °C/W); same VWM/VBR range. | Less suitable for high-energy automotive transients; better for cost-sensitive consumer ports with lower surge exposure. | Select SMAJ85A-E3/5A only if board space allows larger footprint and surge requirement is ≤ 400 W. |
| 1.5KE85A (ON Semiconductor) | DO-201AD axial lead; 1500 W PPPM; 137 V VC; but not surface-mount, not AEC-Q101 qualified, MSL not defined. | Requires through-hole assembly; unsuitable for automated SMT production or automotive qualification programs. | Choose 1.5KE85A only for prototyping or legacy through-hole designs where rework tolerance outweighs production efficiency needs. |
Compared with SMAJ85A-E3/5A and 1.5KE85A, the SMPC85AN-M3/I delivers identical clamping performance in a compact, AEC-Q101-capable SMT package with superior thermal management - making it the preferred choice for volume automotive and industrial applications requiring zero layout change and full process compatibility.
Availability
SMPC85AN-M3/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and power supply input surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMPC85AN-M3/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, TVS devices, and optoelectronics with emphasis on reliability, ruggedness, and application-specific qualification.
The SMPC series was developed to deliver high-power, low-profile TVS protection for automotive and industrial environments where AEC-Q101 compliance, MSL Level 1 handling, and precise clamping control are mandatory.
FAQ
What is the maximum clamping voltage of the SMPC85AN-M3/I under rated surge conditions?
The SMPC85AN-M3/I clamps to 137 V when subjected to its rated 10.9 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured with cathode mounted to heatsink per datasheet test condition and defines the upper voltage limit imposed on protected circuitry during surge events. The SMPC85AN-M3/I maintains this clamping performance consistently across its specified operating temperature range.
Is the SMPC85AN-M3/I AEC-Q101 qualified?
No - the SMPC85AN-M3/I carries the industrial-grade M3 suffix and is not AEC-Q101 qualified. However, the functionally identical SMPC85ANHM3/I variant (with HM3 suffix) is fully AEC-Q101 qualified and shares the same electrical and mechanical specifications. For automotive applications requiring qualification, SMPC85ANHM3/I is the designated part number.
What does the "I" suffix indicate in SMPC85AN-M3/I?
The "I" suffix in SMPC85AN-M3/I denotes the packaging format: 13-inch diameter plastic tape and reel, with a base quantity of 6500 units per reel. This contrasts with the "H" suffix, which indicates 7-inch tape and reel (1500 units). Both share identical electrical, thermal, and mechanical characteristics - only the delivery format differs.
Can SMPC85AN-M3/I be used in bidirectional protection circuits?
No - the SMPC85AN-M3/I is strictly unidirectional and must be oriented with its cathode band toward the system ground or reference plane. It does not conduct in reverse bias beyond its specified leakage current. For bidirectional protection, a separate symmetrical TVS array or back-to-back configuration would be required - neither of which is supported by the SMPC85AN-M3/I's internal structure.
What is the thermal resistance junction-to-ambient for SMPC85AN-M3/I on standard PCB?
The SMPC85AN-M3/I 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. This value is measured per JEDEC 51-2A and is used to calculate allowable power dissipation at elevated ambient temperatures - for example, derating to ~0.75 W at TA = 70 °C.
SMPC85AN-M3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- TO-277, 3-PowerDFN
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 10.9A
- 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)
SMPC85AN-M3/I FAQ
1.How can I place an order for SMPC85AN-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMPC85AN-M3/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 SMPC85AN-M3/I reliable?
The price and inventory of SMPC85AN-M3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMPC85AN-M3/I is usually 5 days.
3.What payment methods are accepted for SMPC85AN-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMPC85AN-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMPC85AN-M3/I?
SMPC85AN-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMPC85AN-M3/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 SMPC85AN-M3/I?
For technical support, including SMPC85AN-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMPC85AN-M3/I requirements.
6.How does Aetrix verify that SMPC85AN-M3/I is sourced from the original manufacturer or authorized distributors?
All SMPC85AN-M3/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 SMPC85AN-M3/I meets industry standards.
7.What is the process for return or replacement of SMPC85AN-M3/I?
All SMPC85AN-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMPC85AN-M3/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 SMPC85AN-M3/I part is unused and in its original packaging.
Return procedure for SMPC85AN-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMPC85AN-M3/I Tags
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