Part A
ADE7858AACPZ
아날로그 디바이스(주)
- Lifecycle
- Active
- Stock
- 3515 PCS
- Series
- 전력 관리(PMIC) - 전력 측정
Replacement verdict
Compatible functional replacement candidate
The ADE7858AACPZ and ADE7868ACPZ are both polyphase energy metering ICs from the same Analog Devices ADE78xx family, sharing an identical LFCSP-40 package, pinout, and 3.3 V supply architecture. The ADE7868ACPZ adds an on-chip temperature sensor channel and a second SPI-capable serial interface option, so it can generally serve as a functional upgrade for the ADE7858AACPZ where the additional temperature measurement and interface flexibility are acceptable, while firmware and register-map validation remain advisable before production substitution.
Package and Pinout
High match
Supply Voltage Range
High match
Integrated Temperature Channel
Validation required
Serial Interface Options
Validation required
Parts at a glance
Part B
ADE7868ACPZ
아날로그 디바이스(주)
- Lifecycle
- Active
- Stock
- 4168 PCS
- Package
- LFCSP-40
- Series
- PMIC - 전력 계량
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADE7858AACPZ | ADE7868ACPZ | Why it matters |
|---|---|---|---|
| Number of Current Input Channels | 3 (three-phase) | 3 (three-phase) plus neutral current input | The ADE7868 adds a dedicated neutral current channel, enabling tamper detection and neutral current monitoring that the ADE7858A cannot perform. |
| On-Chip MCU / DSP Core | No (energy measurement only) | Yes (integrated 8052 MCU core) | The ADE7868 includes an on-chip microcontroller for custom processing and control, while the ADE7858A relies on an external host, affecting system architecture and firmware design. |
| Tamper Detection | Not supported | Supported (via neutral current monitoring) | Tamper detection is a key requirement in utility metering; the ADE7868 supports it while the ADE7858A does not, making them non-substitutable in anti-tamper applications. |
| Package / Pin Count | 40-lead LFCSP | 40-lead LFCSP | Both share the same package footprint, but pin functions differ due to the added neutral channel and MCU, so PCB layout compatibility must be verified. |
| Supply Voltage | 3.3 V (single supply) | 3.3 V (single supply) | Identical supply requirements simplify power design, but the added MCU in the ADE7868 may increase current consumption and thermal considerations. |
| Communication Interface | SPI and I2C | SPI and I2C | Both offer the same host interfaces, but the ADE7868's internal MCU changes how data is accessed and processed by the host system. |
| Energy Measurement Accuracy | Class 0.2 (typical, per datasheet) | Class 0.2 (typical, per datasheet) | Both meet similar accuracy classes for active/reactive energy, so metering accuracy alone does not differentiate them for substitutability. |
| Harmonic / Fundamental Analysis | Supported (fundamental and harmonic components) | Supported (fundamental and harmonic components) | Both provide harmonic analysis capability, which is important for power quality monitoring in advanced metering designs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADE7858AACPZ | ADE7868ACPZ |
|---|---|---|
| Part Status | Active | Active |
| Input Impedance | 400kOhm | 400kOhm |
| Measurement Error | 0.2% | 0.2% |
| Voltage - I / O High | 2V, 2.4V | 2V, 2.4V |
| Voltage - I / O Low | 0.4V, 0.8V | 0.4V, 0.8V |
| Supply Current | 20mA | 20mA |
| Voltage - Supply | 2.8 V ~ 3.7 V | 2.8 V ~ 3.7 V |
| Meter Type | 3 Phase | 3 Phase |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Base Product Number | ADE7858 | - |
| Packaging | Tray | - |
Frequently asked questions
What are the key differences between the ADE7858AACPZ and the ADE7868ACPZ?
Both devices are polyphase energy metering ICs from Analog Devices in a 40-lead LFCSP package. The ADE7858A is a three-phase energy metering IC with serial interfaces (I2C, SPI, and HSDC) and includes three current and three voltage channel inputs. The ADE7868 adds an on-chip temperature sensor and includes a second set of current channel inputs (neutral current) plus a low-power comparator/zero-crossing detection feature, making it suitable for tamper detection and neutral current monitoring. Designers should confirm the exact feature set against the respective datasheets before substitution.
Are the ADE7858AACPZ and ADE7868ACPZ pin-compatible?
Both parts are offered in the same 40-lead LFCSP (CP-40) package, but pin compatibility must be verified pin-by-pin against the official Analog Devices datasheets, because the ADE7868 includes additional functions (such as neutral current inputs and temperature sensor) that may occupy pins differently. Do not assume direct drop-in replacement without confirming the pinout and land pattern from the manufacturer documentation.
Do both devices support the same communication interfaces?
Both the ADE7858A and ADE7868 provide serial communication interfaces including I2C, SPI, and an HSDC (high-speed data capture) port, per Analog Devices documentation. The available interface set should be confirmed against the specific datasheet revision for each part before finalizing a design.
What is the difference in current channel inputs between the two parts?
The ADE7858A provides three current channel inputs (one per phase) and three voltage channel inputs. The ADE7868 provides additional current channel inputs to support neutral current measurement, in addition to the phase current channels. The exact number and configuration of current inputs should be verified from the respective Analog Devices datasheets.
Does the ADE7868ACPZ include features not present in the ADE7858AACPZ?
Yes. The ADE7868 includes an on-chip temperature sensor and a low-power comparator with zero-crossing detection, which are not part of the ADE7858A feature set. These features support applications such as tamper detection and neutral current monitoring. Confirm the complete feature list from the official Analog Devices datasheets before design adoption.
Can the ADE7858AACPZ be used as a direct substitute for the ADE7868ACPZ in an existing design?
Not without validation. Although both are 40-lead LFCSP polyphase metering ICs, the ADE7868 provides additional functions (neutral current inputs, temperature sensor, low-power comparator/zero-crossing detection) that the ADE7858A does not. A direct substitution could remove required functionality or conflict with the PCB layout. Any substitution must be validated against both datasheets and the target application requirements.
Are both devices suitable for polyphase energy metering applications?
Yes. Both the ADE7858A and ADE7868 are polyphase energy metering ICs intended for measuring active, reactive, and apparent energy in three-phase configurations, per Analog Devices product documentation. The specific accuracy specifications and supported metering configurations should be confirmed from each device's datasheet.