TLP7820(B-LF4 - 5V 5kVrms Isolation Amplifier | Toshiba
MPN: TLP7820(B-LF4 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $11.3258 | $11.33 |
| 10 | $11.3258 | $113.26 |
| 100 | $11.3258 | $1,132.58 |
| 500 | $11.3258 | $5,662.90 |
| 1,000 | $11.3258 | $11,325.80 |
TLP7820(B-LF4 Overview
An isolation amplifier is an analog signal-conditioning IC that transfers a low-voltage input across an electrical isolation barrier while electrically separating the input and output grounds. Optically isolated amplifiers use an internal light path or other isolation mechanism to prevent high-voltage ground currents and common-mode transients from reaching the measurement system. This product belongs to the isolation-amplifier family of signal-chain ICs rather than a general-purpose operational amplifier.
The TLP7820 is intended for current sensing in electronic motor drives. In a typical implementation, motor current flows through an external resistor and the resulting analog voltage drop is sensed by the isolation amplifier. Its differential input arrangement helps reject common-mode voltage at the shunt, while the 5000 Vrms isolation rating supports high-side sensing in inverter and motor-control systems. The analog output can be connected to a controller or monitoring ADC after the system designer confirms the required transfer gain, bandwidth, accuracy, and supply conditions.
The verified Toshiba material also references EN IEC 60747-5-5 option (D4) documentation, which is relevant when evaluating isolation-related product qualification requirements. The part is associated with motor phase-current sensing, inverter current sensing, and inverter voltage sensing. The available LCSC listing reports a 5-piece stock example and a starting price of $11.3258, but pricing and inventory are market-dependent and were not provided as a structured XAIPART price schedule.
A practical design must preserve the isolation barrier rather than treating SO8L as an ordinary op-amp package. Keep high-voltage and low-voltage copper regions separated, route the shunt signal as a short differential pair, provide local supply bypassing where the datasheet specifies it, and verify creepage, clearance, capacitor insulation, and system-level withstand requirements. The TLP7820(B-LF4 is best considered for isolated measurement in power-conversion equipment after checking the exact option suffix and datasheet revision.
This page consolidates manufacturer product information, distributor findings, and cross-reference evidence into an engineering-oriented overview. It distinguishes verified information from fields that still require the latest Toshiba datasheet or authorized distributor quote, helping designers evaluate the TLP7820 without substituting unverified ratings or assuming that a similar package implies drop-in compatibility.
Drop-in alternatives for TLP7820(B-LF4 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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TLP7820(B-LF4 Maximum Ratings & Electrical Characteristics
| Product Type | Optically isolated analog-output isolation amplifier |
| Isolation Voltage | 5000 Vrms |
| Supply Voltage Range | 3 V to 5.5 V |
| Nominal Supply Voltage | 5 V |
| Input Configuration | Differential |
| Output Type | Analog |
| Isolation Channel Count | 1 channel |
| Package | SO8L (LF4), 8 pins |
| Package Family | SOIC-8 / SO8L surface-mount family |
| Mounting Type | Surface mount |
| Application Category | Motor phase-current and inverter current/voltage sensing |
| Input Signal | External-resistor voltage drop |
| Isolation Documentation | EN IEC 60747-5-5 option (D4) specification referenced by Toshiba |
TLP7820(B-LF4 soic-8 / so8l surface-mount family Pin Configuration Guide
Pin configuration for TLP7820(B-LF4 (soic-8 / so8l surface-mount family package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for TLP7820(B-LF4.
Refer to the datasheet for full pin configuration.
Typical Applications
TLP7820(B-LF4 is suitable for 6 applications: Motor Phase-Current Sensing, Inverter Current Monitoring, Inverter Voltage Sensing, High-Side Shunt Measurement, Power-Converter Feedback, Industrial Motor-Control Monitoring.
Motor Phase-Current Sensing
The TLP7820(B-LF4 fits phase-current measurement in an electronic motor drive because Toshiba identifies motor phase-current sensing as a primary application. Place the input across an external shunt carrying the motor phase current; the resulting differential voltage represents current without placing the controller-side ground in the high-power path. The device provides analog output and 5000 Vrms isolation in an SO8L package. The design must still verify shunt resistance, input range, gain, bandwidth, common-mode voltage, output scaling, and controller ADC limits against the exact datasheet.
Recommended
Inverter Current Monitoring
Use the TLP7820(B-LF4 when an inverter control system needs an isolated measurement path for a shunt-derived current signal. Its differential input and 5000 Vrms isolation are aligned with power-conversion circuits where switching nodes and ground transients must remain separated from the controller. The analog output can feed a controller ADC or monitoring channel, but the actual scaling depends on the TLP7820 transfer function and the external shunt. Confirm bandwidth, settling behavior, output swing, and ADC input range before selecting resistor values.
Recommended
Inverter Voltage Sensing
The TLP7820(B-LF4 can support isolated voltage monitoring when the inverter’s sensing element and control electronics require a reinforced isolation barrier. Toshiba lists inverter voltage sensing among the product applications, alongside current sensing. The circuit should present a differential signal within the device’s verified input range and provide a controlled output level to the controller. Because the supplied data does not state input range, gain, accuracy, or bandwidth, the designer must use the manufacturer datasheet and verify the complete divider, protection, filtering, and isolation layout.
Recommended
High-Side Shunt Measurement
The TLP7820(B-LF4 is appropriate for high-side shunt measurement when the sensed conductor is electrically isolated from the low-voltage controller. A shunt generates a small differential voltage proportional to current, while the isolation amplifier transfers a scaled analog signal across the barrier. The verified 5000 Vrms isolation rating is the central fit criterion. Design the shunt and input path for the actual current, confirm common-mode limits and input protection, and maintain the required clearance and creepage between the two domains. Do not infer safety compliance from the isolation rating alone.
Recommended
Power-Converter Feedback
In isolated power-converter feedback, the TLP7820(B-LF4 can transfer a measured shunt or divider voltage to the controller side while maintaining isolation from the switching power stage. This can simplify safety-oriented feedback architecture when the measurement point is referenced to a high-voltage node. The device must be checked for the required signal bandwidth, accuracy, output range, and isolation capacitance. Because the verified snippets do not provide those detailed electrical limits, use the exact Toshiba datasheet and simulate the loop before committing the design.
Recommended
Industrial Motor-Control Monitoring
The TLP7820(B-LF4 fits industrial motor-control monitoring where phase current must be measured across a high-voltage isolation barrier. The one-channel analog-output format can provide a dedicated feedback path to a controller or monitoring circuit, while the SO8L package supports compact surface-mount assembly. Engineers should verify the exact lead pattern, isolation creepage, temperature range, and system insulation requirements for the production enclosure. The manufacturer’s product page identifies motor phase-current sensing as a supported application, but detailed qualification and environmental limits remain datasheet-dependent.
Recommended
Recommended Products Summary
Engineering reference data for TLP7820(B-LF4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLP7820(LF4,E | TLP7820(TP4,E | TLP7820(D4ALF4,E | TLP7820(D4BLF4,E |
|---|---|---|---|---|---|
| Brand | Toshiba | Toshiba | Toshiba | Toshiba | Toshiba |
| Package | SO8L (LF4), 8 pins | SO8L (LF4), 8 pins | 8-SOIC family listing | 8-SOIC family listing | 8-SOIC family listing |
| Primary Application | Motor phase-current and inverter sensing | Current sensing and monitoring | Current sensing and monitoring | Monitoring and control systems | Monitoring and control systems |
Key Differentiators
- Isolation voltage (vs TLP7820(TP4,E)
- Application alignment (vs TLP7820(LF4,E)
- Verified input/output description (vs TLP7820(D4ALF4,E)
Design Notes
Treat the isolation barrier as a controlled layout boundary, not as a normal analog ground separation. Route the input-side shunt and the output-side controller traces independently, avoid copper and stitching vias across the barrier, and verify creepage and clearance against the final working voltage, pollution degree, and applicable insulation requirements. The verified 5000 Vrms rating is a device isolation specification; it does not by itself establish the PCB’s reinforced-insulation capability.
Keep the shunt differential pair short and matched, with a defined return path and protection that does not leak current across the isolation barrier. The TLP7820 is intended for differential voltage sensing, so unequal routing can reduce common-mode rejection and disturb the zero-current reference. Confirm the actual input range, bandwidth, gain, and output swing in the exact Toshiba datasheet before selecting filter values or ADC scaling.
The verified product information supports a 3 V to 5.5 V supply range, but it does not provide a complete recommended decoupling table or current budget. Follow the manufacturer’s pin-specific bypass recommendations and verify supply sequencing, ground references, and the analog-output load. Do not estimate power loss or regulator headroom from a generic 5 V label; use the exact datasheet electrical limits and the controller-side supply design.
Do not substitute TLP7820 family ordering codes solely because they are listed as 8-SO or SOIC devices. The supplied comparison pages do not prove identical pinout, gain, bandwidth, qualification, or isolation details. Before replacing TLP7820(B-LF4, compare the full ordering code, lead geometry, creepage, input/output limits, temperature range, and the manufacturer’s latest datasheet.
Compliance Information
The Toshiba product page references EN IEC 60747-5-5 option (D4) documentation, while comparison snippets mention RoHS details. The supplied data does not provide enough verified information to classify the target as RoHS, REACH, lead-free, halogen-free, conflict-minerals compliant, or AEC-Q100 qualified.
