TLP7920(D4ALF1 - 5kVrms Isolation Amp | Toshiba
料号： TLP7920(D4ALF1 ✓ 量产中TLP7920(D4ALF1 概述
An isolation amplifier is a specialized interface IC that combines signal conditioning with galvanic isolation between an input sensing circuit and an output processing system. In the broader power-management and signal-chain hierarchy, it belongs to the isolation-amplifier and isolated-measurement IC family. Its primary role is to reject large common-mode voltage differences, protect sensitive circuitry, and preserve measurement integrity across high-voltage motor-drive environments.
Verified product information identifies one internal channel, differential output, analog output, 5000 Vrms isolation capability, and an 8-SMD gull-wing package. The analog-output architecture makes the device suitable for systems that require continuous proportional information rather than isolated digital communication. The verified distributor record also identifies the part as an isolation amplifier intended for electronic motor drives.
In a typical implementation, motor current flows through an external shunt resistor and produces a small differential voltage proportional to current. The TLP7920(D4ALF1 conditions that voltage and delivers an isolated analog representation to a controller or monitoring circuit. This arrangement supports motor phase-current control, inverter current sensing, and protection functions where the sensing node can be exposed to substantial switching voltage.
The isolation barrier helps separate the high-voltage sensing domain from the lower-voltage control domain. This separation is particularly valuable in industrial motor inverters, where shunt amplifiers must reject switching transients and common-mode voltage while maintaining a proportional output for measurement. The device can therefore be evaluated for isolation, gain accuracy, bandwidth, input range, output behavior, and temperature performance during design review.
A key engineering consideration is that the complete measurement accuracy depends on the external shunt, input filtering, reference design, and isolation performance in addition to the amplifier itself. Component values should be selected according to the Toshiba application information, and the PCB should preserve the isolation barrier and minimize capacitive coupling across it.
This page combines the verified manufacturer and distributor records, exact pricing evidence, package information, commercial availability, and cross-reference findings. It also distinguishes the SMD TLP7920(D4ALF1 from related DIP-packaged TLP7920 variants so engineers do not treat a different package as a true drop-in replacement.
直接替换替代料： TLP7920(D4ALF1 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
该产品暂无直接替换替代料。
请求替代料TLP7920(D4ALF1 最大额定值与电气特性
| Product Type | Isolation amplifier |
| Number of Channels | 1 circuit |
| 输出类型 | Differential |
| Output Signal | Analog |
| Isolation Voltage | 5000 Vrms |
| 封装 | 8-SMD, gull wing |
| 安装类型 | Surface mount |
| Isolation Technology | Optocoupler-based isolation amplifier |
| Primary Application | Motor phase-current and voltage sensing |
| RoHS Compliance | Compliant |
| Unit Price | 5.3301 USD per unit as of 2026-10-28 |
| Referenced Stock | 5152 pieces as of 2026-10-28 |
TLP7920(D4ALF1 8-smd, gull wing 引脚配置指南
TLP7920(D4ALF1（8-smd, gull wing 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： TLP7920(D4ALF1.
请参阅 数据手册 以查看完整引脚配置。
典型应用
TLP7920(D4ALF1 适用于 6 应用s: Motor Phase-Current Sensing, Inverter Current Protection, Industrial Motor Drive Feedback, Isolated Voltage Measurement, Power-Supply Current Monitoring, Bidirectional Current-Sense Interface.
Motor Phase-Current Sensing
The TLP7920(D4ALF1 fits isolated motor phase-current measurement because the Toshiba documentation identifies motor-drive current sensing as a target application. An external shunt converts phase current into a differential voltage, which the one-channel isolation amplifier converts into a proportional differential analog signal. Its 5000 Vrms isolation rating helps separate the switching-power domain from the controller domain. Final accuracy still depends on shunt tolerance, amplifier gain, reference quality, filtering, and the timing of the control system.
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Inverter Current Protection
The TLP7920(D4ALF1 can support inverter overcurrent monitoring where a shunt-generated differential signal must reach a controller across a high-voltage barrier. The device provides one analog isolation channel with a 5000 Vrms isolation rating, allowing the sensing front end and control circuitry to remain galvanically separated. Designers should verify response time, gain error, output settling, input limits, and common-mode transient performance against the Toshiba data before setting protection thresholds or fault latency.
推荐
Industrial Motor Drive Feedback
The TLP7920(D4ALF1 is appropriate for industrial motor-drive feedback systems that require an analog, isolated representation of a shunt voltage. Unlike a digital isolation link, the verified analog-output architecture provides a continuous measurement signal suitable for current control loops. The one-channel format suits designs where each phase or selected branch requires an isolated sensor. PCB creepage, isolation-barrier clearance, shunt placement, grounding, and filtering must be designed together to preserve both measurement quality and isolation integrity.
推荐
Isolated Voltage Measurement
Toshiba identifies the TLP7920 family for both motor-current and voltage sensing, allowing the TLP7920(D4ALF1 to be evaluated for isolated differential-voltage measurement. The 5000 Vrms isolation barrier is useful when the measured voltage is referenced to a high-side or switching node and must not be electrically connected to the control ground. The engineer must verify the actual input differential range, input impedance, gain, offset, bandwidth, and output limits from the official datasheet before defining the divider and analog front end.
推荐
Power-Supply Current Monitoring
The TLP7920(D4ALF1 may be used to monitor current in an isolated power-conversion branch when the sensing arrangement produces a differential voltage proportional to load current. The device's one-channel differential analog output can feed a controller input or external measurement circuit. Compared with putting a high-side current sensor directly on the controller ground, the verified 5000 Vrms isolation rating can simplify the grounding boundary. Applications still require shunt selection, input filtering, output scaling, and verification that the operating points remain inside the datasheet limits.
推荐
Bidirectional Current-Sense Interface
The verified differential output of the TLP7920(D4ALF1 makes it a candidate for current-sense interfaces that must represent positive or negative current around a zero reference. This is useful in regenerative drives, braking systems, and bidirectional converters where the shunt can produce either polarity. The practical circuit must establish the correct reference, account for input and output common-mode limits, and preserve adequate bandwidth for control-loop requirements. These electrical details were not present in the supplied excerpts and must be confirmed from the complete Toshiba documentation.
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推荐产品汇总
工程参考数据： TLP7920(D4ALF1 ——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 | TLP7920(D4,F | TLP7920(D4-A,F | TLP7920(D4-TP1,F |
|---|---|---|---|---|
| Package | 8-SMD, gull wing | DIP-8 - not drop-in | DIP-8 - not drop-in | DIP-8, gull wing - not drop-in |
| Brand | Toshiba | Toshiba | Toshiba | Toshiba |
| Drop-In Status | Reference device | No - different package | No - different package | No - different package and output type |
关键差异点
- Surface-mount implementation （对比 TLP7920(D4,F)
- Differential output description （对比 TLP7920(D4-TP1,F)
- Motor-drive current-sensing positioning （对比 TLP7920(D4-A,F)
设计说明
Treat the isolation barrier as a controlled PCB feature rather than ordinary signal routing. Keep copper, components, and test pads from crossing between the input-side and output-side ground domains, and maintain the creepage and clearance required by the application and applicable safety standard. Because the exact package pinout was not included in the supplied records, verify every connection against the official Toshiba package drawing before release.
Place the external shunt and any input filtering directly at the TLP7920(D4ALF1 input pins to minimize loop area and susceptibility to motor-switching transients. Use a differential return strategy that controls common-mode voltage and keeps sensor traces short. Component values and filter corners should be derived from the official input-range and bandwidth data rather than from the distributor excerpts alone.
Design the input and output supplies for the exact range, sequencing, and decoupling requirements stated in the Toshiba documentation. The supplied evidence does not identify the supply voltage or quiescent current, so no capacitor value or dissipation calculation can be verified. Confirm those values, then check startup behavior and output settling to ensure the downstream controller never samples an invalid analog level during power-up.
Do not substitute the related TLP7920(D4,F or TLP7920(D4-A,F solely because the base family name is similar. The verified records identify DIP-8 alternatives, while the target is an 8-SMD gull-wing device; another comparison also distinguishes amplifier and differential outputs. A replacement must satisfy footprint, pinout, output topology, isolation rating, gain, bandwidth, input range, supply requirements, and temperature-range requirements.
合规信息
RoHS compliance is stated in the supplied cross-reference record. No verified REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declaration was provided. AEC-Q100 is marked not applicable because no automotive qualification evidence was supplied and the product is not described as an automotive-qualified device.
