Part A
ADE7858AACPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3515 PCS
- Series
- Gestão da Energia (PMIC) - Medição da Energia
Replacement verdict
Compatible functional replacement candidate
The ADE7858AACPZ and ADE7868AACPZ are functionally compatible polyphase energy metering ICs sharing the same LFCSP-40 package, pinout, and core metering architecture, making the ADE7868AACPZ a viable replacement candidate for the ADE7858AACPZ in most designs. The primary distinction lies in the ADE7868AACPZ's integrated on-chip temperature sensor and additional power quality features, which require firmware validation before substitution.
Package Type
High match
Pin Configuration
High match
Core Metering Function
High match
Integrated Temperature Sensor
Validation required
Parts at a glance
Part B
ADE7868AACPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3374 PCS
- Package
- LFCSP-40
- Series
- PMIC - Medição de Energia
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 | ADE7868AACPZ | Why it matters |
|---|---|---|---|
| Number of Current Input Channels | 3 (three-phase) | 3 (three-phase) plus neutral current | The ADE7868A adds a dedicated neutral current channel, enabling tamper detection and neutral current measurement that the ADE7858A cannot perform. |
| On-Chip MCU / DSP Core | No (energy metering only) | Yes (integrated 8052 MCU) | The ADE7868A includes an on-chip microcontroller for local processing and control, while the ADE7858A relies on an external host, affecting system architecture and BOM. |
| Tamper Detection | Not supported | Supported (via neutral current monitoring) | Tamper detection is a key requirement in utility metering; only the ADE7868A provides this capability natively. |
| Package / Pin Count | LFCSP (40-lead) | LFCSP (40-lead) | Both share the same package footprint, but the internal feature set differs, so board-level compatibility must be verified against pin functions. |
| Supply Voltage | 3.3 V (single supply) | 3.3 V (single supply) | Identical supply requirements simplify power design, but the added MCU in the ADE7868A may increase current consumption. |
| Communication Interface | SPI / I2C | SPI / I2C | Both support the same serial interfaces, easing host-side firmware reuse, though register maps and command sets differ. |
| Energy Measurement Accuracy | Class 0.2 (typical) | Class 0.2 (typical) | Both target high-accuracy metering, so accuracy alone does not differentiate them for substitutability. |
| On-Chip Memory (Flash/RAM) | None (no MCU) | Integrated program/data memory for 8052 core | The ADE7868A can store and run firmware locally, enabling standalone operation not possible with the ADE7858A. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADE7858AACPZ | ADE7868AACPZ |
|---|---|---|
| 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 is the primary functional difference between the ADE7858AACPZ and the ADE7868AACPZ?
Both devices are polyphase energy metering ICs from Analog Devices. The ADE7858AACPZ provides active, reactive, and apparent energy measurements plus RMS and power factor readings. The ADE7868AACPZ adds on-chip fundamental and harmonic component separation (fundamental active/reactive power and harmonic active/reactive power) that the ADE7858AACPZ does not provide, making the ADE7868AACPZ suitable for applications requiring harmonic analysis.
Are the ADE7858AACPZ and ADE7868AACPZ pin-to-pin and package compatible?
Yes. Both devices are offered in the same 40-lead LFCSP (CP-40) package with identical pinout assignments, so they are pin-to-pin compatible and share the same PCB land pattern. This allows a common board design to accommodate either device.
Do the ADE7858AACPZ and ADE7868AACPZ share the same serial interface and register map?
Both devices provide an SPI-compatible serial port and an I2C-compatible interface for register access. They share the core metering register architecture, but the ADE7868AACPZ includes additional registers for fundamental and harmonic power data that are not present on the ADE7858AACPZ, so firmware must account for these extra registers when migrating.
What are the supply voltage and reference requirements for these devices?
Both the ADE7858AACPZ and ADE7868AACPZ operate from a single 3.3 V supply (VDD) with a separate digital supply (VDDIO) that supports 3.3 V or 2.5 V logic interfaces. Each device includes an on-chip 1.2 V reference, and an external reference can be connected if required by the application.
Which device should be selected for an application requiring harmonic power analysis?
The ADE7868AACPZ should be selected. Its fundamental and harmonic power computation capability supports harmonic analysis and related power quality measurements, whereas the ADE7858AACPZ provides total active, reactive, and apparent energy without separate fundamental/harmonic separation.
Are the ADE7858AACPZ and ADE7868AACPZ specified over the same operating temperature range?
Yes. Both devices are specified for operation over the industrial temperature range of −40°C to +85°C, allowing either part to be used in the same environmental conditions.
Can the ADE7858AACPZ be replaced by the ADE7868AACPZ without hardware changes?
Hardware replacement is feasible because the two devices are pin-compatible in the same 40-lead LFCSP package. However, firmware must be updated to handle the additional fundamental and harmonic registers of the ADE7868AACPZ, and the design should be validated against the respective datasheets before substitution.