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onsemi FOD0720R2
- Part No.:
- FOD0720R2
- Manufacturer:
- onsemi
- Category:
- Logic Output Optoisolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
FOD0720R2.pdf
- Description:
- OPTOISO 3.75KV PUSH PULL 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,150
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Product details
Overview
FOD0720R2 from ON Semiconductor (formerly Fairchild) is a high-speed logic gate optocoupler designed for bidirectional signal isolation in industrial digital interfaces. It delivers 25 Mbit/sec data rate, 40 ns max propagation delay, 8 ns pulse width distortion, and 20 kV/µs minimum common-mode transient immunity across a -40°C to +100°C operating range - enabling robust communication in Profibus, DeviceNet, and isolated RS-485 systems.
For engineers reviewing the FOD0720R2 datasheet, pinout, applications, or equivalent options, key selection criteria include verified CMR performance at full temperature range, guaranteed 25 Mbps NRZ timing compliance, dual 5 V CMOS supply compatibility, and UL1577-certified 3750 VACrms isolation - all in an industry-standard SOIC-8 package.
Technical Context
The FOD0720R2 integrates a high-efficiency AlGaAs LED with a monolithic CMOS detector IC containing a photodiode, transimpedance amplifier, and voltage comparator with output driver. Its coplanar Optoplanar packaging ensures precise die alignment and minimized parasitic capacitance (0.2 pF typical).
It operates with separate input (VDD1/GND1) and output (VDD2/GND2) supplies, supports non-return-to-zero (NRZ) encoding, and maintains logic-level compatibility with 4.5–5.5 V CMOS rails on both sides - enabling galvanic isolation without level-shifting circuitry in fieldbus node designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 25 Mbit/sec NRZ - supports full-speed operation in CAN FD and Profibus DP physical layer links |
| Propagation Delay | 21–40 ns - enables sub-40 ns timing budgets for real-time PLC I/O cycle synchronization |
| Pulse Width Distortion | ≤8 ns - preserves duty cycle integrity for clock distribution and synchronous serial interfaces |
| CMR | ≥20 kV/µs - rejects fast transients from motor drives and relay switching in factory automation |
| Isolation Voltage | 3750 VACrms (1 min) - meets UL1577 safety requirements for reinforced insulation in industrial equipment |
| Operating Temperature | -40°C to +100°C - qualified for under-hood and control cabinet environments without derating |
| Supply Voltage | VDD1/VDD2 = 4.5–5.5 V - compatible with standard 5 V logic rails and eliminates need for auxiliary regulators |
Pinout & Package
Package: 8-pin SOIC (Small Outline Integrated Circuit), surface-mount, RoHS-compliant, JEDEC-standard footprint (5.3 mm × 4.4 mm body, 1.27 mm pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD1 | Input-side CMOS supply rail - must be decoupled with 0.1 µF capacitor to Pin 4 |
| 2 | VI | Digital input signal (CMOS-compatible) - accepts 0–5 V logic levels with 2.0 V VIH threshold |
| 3 | LED Anode | Internally connected; must remain unconnected per datasheet - no external bias required |
| 4 | GND1 | Input-side ground reference - forms isolated input domain with Pins 1–4 |
| 5 | GND2 | Output-side ground reference - forms isolated output domain with Pins 5–8 |
| 6 | VO | Digital output signal (CMOS-compatible) - drives 4 mA load with VOL ≤ 0.5 V at 4 mA sink |
| 7 | NC | No internal connection - left floating; no PCB trace or pad required |
| 8 | VDD2 | Output-side CMOS supply rail - must be decoupled with 0.1 µF capacitor to Pin 5 |
Key Features
| Feature | Design Value |
|---|---|
| Optoplanar coplanar packaging | Minimizes inter-die capacitance (0.2 pF) to sustain >20 kV/µs CMR across full temperature range |
| Integrated transimpedance amplifier | Eliminates external gain stages - reduces BOM count and layout sensitivity in high-noise environments |
| CMOS detector IC with comparator | Provides rail-to-rail VO swing (0–5 V) and sharp edge transitions (tR/tF ≤ 5 ns) for clean clock/data recovery |
| UL1577 certified isolation | 3750 VACrms withstand voltage validated for 1 minute - satisfies reinforced insulation requirements per IEC 61800-5-1 |
| Extended temperature operation | Guaranteed 25 Mbps performance from -40°C to +100°C - no derating needed for industrial control cabinets |
Applications
| Industrial Fieldbus Interface | Programmable Logic Controller I/O |
|---|---|
|
Use Scenario: Isolating RS-485 transceiver control lines in Profibus DP slave nodes exposed to motor drive noise. IC Role / Device Role / Timing Role: Signal-level galvanic isolator for TXEN, DE, and data lines - preserving NRZ timing integrity at 12 Mbps. Use Value: 20 kV/µs CMR prevents false triggering during 400 V bus switching transients; 40 ns propagation delay enables tight timing margins in cyclic data exchange. |
Use Scenario: Isolating digital input/output signals between CPU backplane and field-side terminal blocks in modular PLC chassis. IC Role / Device Role / Timing Role: High-speed logic gate coupler for 24 V DC input sensing and 5 V CMOS output driving - supporting 1 ms scan cycles. Use Value: Dual 5 V supply domains eliminate level-shifters; 8 ns PWD ensures accurate sampling of fast edge-triggered inputs in motion control applications. |
| Isolated Data Acquisition | Motor Drive Control Interface |
|
Use Scenario: Isolating SPI or parallel data paths between ADC front-end and host MCU in high-voltage power metering systems. IC Role / Device Role / Timing Role: Bidirectional digital isolator for conversion-ready strobes and data valid signals - maintaining 25 Mbps throughput. Use Value: 0.2 pF isolation capacitance minimizes crosstalk between measurement and processing domains; 3750 VACrms rating satisfies IEC 62053 creepage requirements. |
Use Scenario: Isolating PWM gate drive enable/disable signals between DSP controller and IGBT driver stage in servo inverters. IC Role / Device Role / Timing Role: Fast-response logic isolator for fault-clear and dead-time control signals - ensuring safe turn-on/turn-off sequencing. Use Value: 40 ns max tPHL/tPLH guarantees <100 ns total isolation latency; 20 kV/µs CMR suppresses dV/dt-induced shoot-through in 600 V DC link environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed logic gate optocoupler applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLP2362(TP,E | 20 Mbps max data rate; 60 ns max propagation delay; 15 kV/µs CMR; same SOIC-8 package | Limited to lower-speed industrial networks (e.g., Modbus RTU); not suitable for 25 Mbps Profibus DP | Select when cost sensitivity outweighs speed requirement and CMR margin can be relaxed by 5 kV/µs |
| ACPL-K49T-000E | 50 Mbps data rate; 25 ns max propagation delay; 35 kV/µs CMR; SOIC-8 with enhanced creepage | Supports higher-speed protocols (e.g., EtherCAT) and harsher EMI environments; requires tighter layout controls | Choose for next-generation drives requiring >25 Mbps or >30 kV/µs immunity - verify PCB creepage spacing per IEC 61800-5-1 |
Compared with TLP2362(TP,E and ACPL-K49T-000E, the FOD0720R2 delivers optimal balance of 25 Mbps performance, 20 kV/µs CMR, and proven field reliability in established industrial fieldbus deployments - without requiring layout redesign or thermal derating.
Availability
FOD0720R2 is available at Aetrix Electronics and suitable for industrial fieldbus interfaces, programmable logic controller I/O modules, and isolated data acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for FOD0720R2 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
ON Semiconductor (formerly Fairchild Semiconductor) is a global semiconductor manufacturer specializing in power management, analog, sensor, and discrete solutions for automotive, industrial, and cloud power applications.
The FOD0720R2 belongs to ON Semiconductor's high-speed optocoupler product line, engineered specifically for noise-immune digital isolation in industrial automation and motor control systems where timing fidelity and safety certification are critical.
FAQ
What is the maximum data rate supported by the FOD0720R2?
The FOD0720R2 supports a maximum data rate of 25 Mbit/sec using non-return-to-zero (NRZ) coding. This specification is guaranteed across the full operating temperature range (-40°C to +100°C) and under recommended supply conditions (VDD1/VDD2 = 4.5–5.5 V). The FOD0720R2 achieves this performance through its optimized AlGaAs LED and integrated CMOS detector architecture - making it suitable for high-speed industrial fieldbus applications such as Profibus DP and DeviceNet.
Does the FOD0720R2 require external current-limiting resistors on the input side?
No, the FOD0720R2 does not require external current-limiting resistors on the input side because it incorporates an integrated CMOS driver that regulates LED current internally. Input VI is directly CMOS-compatible (0–5 V logic levels), and the device draws only 6.5–10.0 mA IDD1L under logic-low conditions. This eliminates the need for discrete biasing components and simplifies PCB layout - a key advantage over older optocoupler architectures requiring external resistor networks.
What safety certifications does the FOD0720R2 hold?
The FOD0720R2 is certified to UL1577 (File #E90700, Volume 2) for 3750 VACrms isolation voltage for 1 minute, and complies with IEC60747-5-2 (pending approval at time of datasheet publication). These certifications validate its suitability for reinforced insulation in industrial equipment per IEC 61800-5-1 and other functional safety standards. The FOD0720R2's Optoplanar packaging and 0.2 pF isolation capacitance further support its use in safety-critical signal isolation paths.
Can the FOD0720R2 operate with different supply voltages on input and output sides?
Yes, the FOD0720R2 supports independent input (VDD1) and output (VDD2) supply rails, each rated for 4.5–5.5 V. This allows true galvanic isolation between domains - for example, interfacing a 5 V microcontroller I/O with a 5 V RS-485 transceiver while maintaining separation. Both supplies must be decoupled with 0.1 µF capacitors (VDD1–GND1 and VDD2–GND2), and Pin 3 (LED anode) must remain unconnected as specified in the FOD0720R2 datasheet.
How does the FOD0720R2 compare to the FOD0721R2 in terms of pulse width distortion?
The FOD0720R2 has a maximum pulse width distortion (PWD) of 8 ns, whereas the FOD0721R2 is specified at 6 ns - both measured under identical test conditions (PW = 40 ns, CL = 15 pF). This 2 ns difference reflects tighter internal timing matching in the FOD0721R2's detector IC, making it preferable for ultra-low-jitter clock distribution. However, the FOD0720R2's 8 ns PWD remains fully adequate for most industrial data transmission protocols including Profibus DP and DeviceNet, where jitter tolerance exceeds 10 ns.
FOD0720R2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Channels:
- 1
- Inputs - Side 1/Side 2:
- 1/0
- Voltage - Isolation:
- 3750Vrms
- Common Mode Transient Immunity (Min):
- 20kV/µs
- Input Type:
- Logic
- Output Type:
- Push-Pull, Totem Pole
- Current - Output / Channel:
- 10 mA
- Data Rate:
- 25Mbps
- Propagation Delay tpLH / tpHL (Max):
- 40ns, 40ns
- Rise / Fall Time (Typ):
- 5ns, 4.5ns
- Voltage - Forward (Vf) (Typ):
- -
- Current - DC Forward (If) (Max):
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 100°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
FOD0720R2 FAQ
1.How can I place an order for FOD0720R2 through Aetrix?
Please submit a Request for Quotation (RFQ) for FOD0720R2 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 FOD0720R2 reliable?
The price and inventory of FOD0720R2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FOD0720R2 is usually 5 days.
3.What payment methods are accepted for FOD0720R2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FOD0720R2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FOD0720R2?
FOD0720R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FOD0720R2 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 FOD0720R2?
For technical support, including FOD0720R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FOD0720R2 requirements.
6.How does Aetrix verify that FOD0720R2 is sourced from the original manufacturer or authorized distributors?
All FOD0720R2 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 FOD0720R2 meets industry standards.
7.What is the process for return or replacement of FOD0720R2?
All FOD0720R2 units undergo pre-shipment inspection (PSI). If there is an issue with FOD0720R2, 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 FOD0720R2 part is unused and in its original packaging.
Return procedure for FOD0720R2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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