TLP7820(D4BLF4 - 5kV Isolation Amplifier | Toshiba
料号： TLP7820(D4BLF4 ✓ 量产中TLP7820(D4BLF4 概述
An isolation amplifier is a signal-conditioning IC that transfers an analog measurement across a galvanic-isolation barrier while providing signal amplification and common-mode rejection. The TLP7820 belongs to the optically isolated amplifier category, which is part of the broader interface IC and industrial signal-conditioning hierarchy. Its optical isolation barrier helps protect low-voltage measurement circuitry from high-side motor-drive voltages while preserving accurate current information.
Key device attributes include a one-channel isolation amplifier configuration, analog differential output, 5 V operation, 5000 Vrms isolation rating, and an 8-pin SO8L package. The precision-amplifier-based signal path is intended for DC current measurement rather than general-purpose AC isolation. Differential output helps reject common-mode voltage and noise present across the external shunt, improving measurement fidelity in electrically noisy power-electronic systems.
Toshiba positions the TLP7820 for electronic motor drives where current flows through an external resistor and the resulting analog voltage drop is sensed by the isolation amplifier. The isolation barrier allows the sensor interface to remain electrically separate from the inverter or motor supply. Compared with a discrete shunt amplifier and optocoupler combination, the integrated device can reduce board area and simplify signal-chain assembly, although system-level creepage, capacitance, and layout requirements still require careful review.
Typical applications include motor phase-current monitoring, inverter current sensing, power-converter feedback, industrial motor controls, and isolated DC measurement systems. These systems benefit from the 5000 Vrms isolation capability and analog output while requiring suitable input filtering, supply decoupling, and a low-impedance measurement network.
Designers should follow the manufacturer datasheet for the exact pin assignment, recommended shunt value, input range, output configuration, permissible isolation, and application circuit. PCB creepage and clearance must be maintained across the isolation barrier, and the analog input and output paths should be kept compact and away from high-voltage switching nodes.
This page consolidates verified manufacturer and distributor information, same-family replacement options, application guidance, and design cautions to support faster component selection and PCB implementation of the TLP7820(D4BLF4.
直接替换替代料： TLP7820(D4BLF4 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
TLP7820(TP4,E
✅ 直接替换📋 参考替代料（不在目录中）
TLP7820(B-LF4,E
✅ 直接替换📋 参考替代料（不在目录中）
TLP7820(D4BTP4,E
✅ 直接替换📋 参考替代料（不在目录中）
TLP7820(D4ALF4,E
✅ 直接替换📋 参考替代料（不在目录中）
TLP7820(D4-TP4,E
✅ 直接替换📋 参考替代料（不在目录中）
TLP7820(D4BLF4 最大额定值与电气特性
| Product Type | Optically isolated amplifier |
| Isolation Amplifier Channels | 1 channel |
| 输出类型 | Differential analog output |
| 电源电压 | 5 V |
| Isolation Voltage | 5000 Vrms |
| 封装 | SO8L, 8-pin |
| 安装类型 | Surface mount |
| Primary Application | Motor phase-current and voltage sensing |
| Application Sector | Industrial motor drives and inverters |
| Input Signal | Differential analog voltage across an external shunt resistor |
| Signal Chain | Optical isolation and precision current-signal amplification |
| RoHS 状态 | Compliant |
| VDE Recognition | Available |
| Manufacturer Datasheet Document | TLP7820 E 20260527 |
TLP7820(D4BLF4 so8l, 8-pin 引脚配置指南
TLP7820(D4BLF4（so8l, 8-pin 封装）的引脚配置。 该模拟元件具有输入、输出和电源引脚。请参阅制造商数据手册以了解失调调零、补偿和使能引脚配置。适用于信号调理和放大器电路。
暂无详细引脚数据： TLP7820(D4BLF4.
请参阅 数据手册 以查看完整引脚配置。
典型应用
TLP7820(D4BLF4 适用于 6 应用s: Motor Phase-Current Monitoring, Inverter Current Sensing, Industrial Motor-Control Feedback, Isolated DC Current Measurement, Power-Converter Feedback, Isolated Voltage Sensing.
Motor Phase-Current Monitoring
The TLP7820(D4BLF4 fits motor phase-current monitoring because the Toshiba manufacturer page identifies it as an isolation amplifier for electronic motor drives. An external shunt resistor converts phase current into a differential analog voltage, while the device's one-channel 5 V signal path and 5000 Vrms isolation separate the measurement from the inverter environment. This arrangement supports closed-loop motor control without connecting the low-voltage controller directly to the high-side power stage. The principal design trade-off is that accuracy and bandwidth depend on the shunt value, input network, input range, and isolation capacitance specified in the manufacturer datasheet, none of which were available in the supplied excerpt.
Inverter Current Sensing
The TLP7820(D4BLF4 is suitable for inverter current sensing where a differential analog measurement must cross from a switching power circuit into a controller. Its verified 5000 Vrms isolation capability, differential output, and 5 V operation align with isolated gate-driver and motor-control architectures. Placing the amplifier across a shunt or suitable current-sense network allows the controller to monitor phase current without a high-voltage direct connection. Layout must preserve creepage and clearance across the isolation barrier, while the analog traces should remain short and separated from high-dV/dt switching nodes to prevent coupling errors.
Industrial Motor-Control Feedback
Industrial motor controls can use the TLP7820(D4BLF4 to acquire an isolated analog current signal for regulation, protection, or diagnostics. The one-channel optically isolated amplifier provides a compact bridge between a shunt-based sensing stage and a 5 V control domain, avoiding a separate precision amplifier and optocoupler arrangement. The 5000 Vrms isolation rating supports reinforced separation in suitable PCB constructions, although working voltage, pollution degree, and creepage remain system-level constraints. Engineers should verify the exact input range and gain from the current Toshiba datasheet before selecting the external shunt and signal-conditioning values.
Isolated DC Current Measurement
The TLP7820(D4BLF4 can be applied to isolated DC current measurement when the measured current passes through an external resistor and the resulting differential voltage lies within the device's specified input range. Its 5 V supply and differential analog output simplify connection to a low-voltage sampling or control system while maintaining a 5000 Vrms isolation barrier. This topology is useful in power-converter feedback and laboratory instrumentation. The verified data does not expose gain or input-voltage limits, so input scaling, shunt power dissipation, and amplifier bandwidth must be established from the manufacturer documentation before production release.
Power-Converter Feedback
The TLP7820(D4BLF4 fits isolated power-converter feedback where the controller needs accurate information from a high-side current-sense network. The device's differential analog output helps preserve measurement integrity when the shunt voltage is small relative to switching-related common-mode voltage. Its optical isolation and 5000 Vrms rating provide a defined separation between the power domain and 5 V control electronics. Compared with an optocoupler-only feedback path, the integrated amplifier can offer a more direct analog signal representation. PCB isolation geometry, capacitor selection, and grounding must still be validated against the Toshiba application circuit and the end-product safety standard.
Isolated Voltage Sensing
The Toshiba product page lists motor phase-current and voltage sensing among the TLP7820(D4BLF4's intended applications. For isolated voltage sensing, the input network must scale the voltage into the range accepted by the isolation amplifier while preserving the required measurement accuracy. The differential output and 5000 Vrms isolation can then transfer the measurement to a 5 V processing domain. Because the supplied verified excerpt does not state the complete input range, gain, or accuracy limits, engineers should use the current TLP7820 datasheet as the controlling document and prototype the divider, filtering, and isolation layout before production.
工程参考数据： TLP7820(D4BLF4 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | TLP7820(TP4,E | TLP7820(B-LF4,E | TLP7820(D4BTP4,E | TLP7820(D4ALF4,E | TLP7820(D4-TP4,E |
|---|---|---|---|---|---|---|
| Package | SO8L (LF4), 8-pin | SO8L (LF4), 8-pin | SO8L (LF4), 8-pin | SO8L (LF4), 8-pin | SO8L (LF4), 8-pin | SO8L (LF4), 8-pin |
| Brand | Toshiba Semiconductor and Storage | Toshiba Semiconductor and Storage | Toshiba Semiconductor and Storage | Toshiba Semiconductor and Storage | Toshiba Semiconductor and Storage | Toshiba Semiconductor and Storage |
| Product Type | Optically isolated amplifier | Optically isolated amplifier | Optically isolated amplifier | Optically isolated amplifier | Optically isolated amplifier | Optically isolated amplifier |
| Channel Count | 1 channel | 1 channel | 1 channel | 1 channel | 1 channel | 1 channel |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V | 5 V |
| Isolation Voltage | 5000 Vrms | 5000 Vrms | 5000 Vrms | 5000 Vrms | 5000 Vrms | 5000 Vrms |
| Output Type | Differential analog output | Differential amplifier output | Differential amplifier output | Differential amplifier output | Differential amplifier output | Differential amplifier output |
| Primary Application | Motor phase-current and voltage sensing | Current sensing | Current sensing | Current sensing | Current sensing | Current sensing |
| RoHS Status | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
关键差异点
- Purpose-built isolated current-measurement signal path （对比 TLP7820(B-LF4,E)
- Verified manufacturer alignment for motor-drive sensing （对比 TLP7820(TP4,E)
- Differential analog output for shunt measurement （对比 TLP7820(D4-TP4,E)
设计说明
Treat the isolation boundary as a safety-critical layout constraint. Maintain the creepage, clearance, slotting, coating, and pad-spacing requirements from the current Toshiba datasheet and the applicable end-product standard. The 5000 Vrms component rating does not by itself define the PCB working voltage. Place the shunt and input network on the isolated side, keep the analog output and supply circuitry on the logic side, and avoid placing copper that bridges the barrier unless the approved design explicitly permits it.
Use the manufacturer's typical application circuit and pin assignment as the PCB baseline. Keep the shunt connections and amplifier input traces short and pair the differential inputs symmetrically. Route the traces away from motor-switching nodes, gate-drive outputs, inductors, and transformers, because capacitive coupling can inject error even when the nominal signal is differential. A solid uninterrupted ground or return arrangement on each isolated side should be reviewed together with the isolation capacitance and system grounding architecture.
Do not infer input range, gain, accuracy, bandwidth, or thermal limits from the distributor category labels; those values were not supplied in the verified excerpts. Before releasing the design, verify the current TLP7820 datasheet for the D4BLF4 ordering code, the recommended shunt network, input and output saturation, supply decoupling, allowable common-mode voltage, and operating temperature. Also confirm that the selected suffix matches the PCB footprint and lead arrangement.
合规信息
RoHS compliance is stated in the verified Mouser listing, and the same listing identifies VDE recognition. REACH, lead-free status, halogen-free status, conflict-minerals status, and automotive qualification were not present in the supplied verified data. The isolation amplifier is not presented as an AEC-Q100-qualified automotive device.
