MCP602 — Dual Rail-to-Rail Input/Output Operational Amplifier

Overview

The MCP602 (commonly MCP602-I/P in DIP-8 or MCP602-I/SN in SOIC-8) is a low-power, rail-to-rail input and output dual operational amplifier manufactured by Microchip Technology. Fabricated using advanced CMOS processing, it operates from a single supply voltage of $2.7\text{ V}$ to $6.0\text{ V}$ while consuming only $325\ \mu\text{A}$ per amplifier.

With a typical input bias current of just $1\text{ pA}$ , a gain-bandwidth product of $2.8\text{ MHz}$ , and a $2.3\text{ V}/\mu\text{s}$ slew rate, the MCP602 is ideal for 3.3V and 5V microcontroller sensor signal conditioning (photodiodes, piezoelectric sensors, strain gauges, active filters) where true rail-to-rail dynamic range is required.

Quick reference


Op-Amp Type	Dual Rail-to-Rail Input/Output Low-Power CMOS Operational Amplifier
Package	8-Pin DIP (Through-Hole) / SOIC-8 / TSSOP-8
Supply Voltage Range ( $V_{DD}$ )	$2.7\text{ V}$ to $6.0\text{ V}$ DC
Rail-to-Rail Architecture	Full Rail-to-Rail Input ( $V_{SS} - 0.3\text{V}$ to $V_{DD} + 0.3\text{V}$ ) and Output ( $V_{SS} + 50\text{mV}$ to $V_{DD} - 50\text{mV}$ )
Input Bias Current	$1\text{ pA}$ typical at $25^\circ\text{C}$
Gain Bandwidth Product (GBW)	$2.8\text{ MHz}$
Slew Rate	$2.3\text{ V}/\mu\text{s}$
Quiescent Current	$325\ \mu\text{A}$ typical per channel

Pinout (Standard Dual Op-Amp 8-Pin Package)

text

        ┌──────────┐
  VOUTA ─│ 1      8 │─ VDD
  VINA- ─│ 2      7 │─ VOUTB
  VINA+ ─│ 3      6 │─ VINB-
    VSS ─│ 4      5 │─ VINB+
        └──────────┘

Pin	Name	Description
1	`VOUTA`	Operational Amplifier A output
2	`VINA-`	Operational Amplifier A inverting input
3	`VINA+`	Operational Amplifier A non-inverting input
4	`VSS`	Ground reference (0 V) or negative supply rail
5	`VINB+`	Operational Amplifier B non-inverting input
6	`VINB-`	Operational Amplifier B inverting input
7	`VOUTB`	Operational Amplifier B output
8	`VDD`	Positive power supply rail (+2.7V to +6.0V DC)

Specifications

Parameter	Symbol	Min	Typ	Max	Unit	Conditions
Supply Voltage Range	$V_{DD}$	2.7	5.0	6.0	V	Operational range
Input Offset Voltage	$V_{OS}$	—	2.0	4.5	mV	$V_{DD} = 5.0\text{V}, V_{CM} = V_{DD}/2$
Input Bias Current	$I_{B}$	—	1.0	100	pA	$T_A = 25^\circ\text{C}$
Slew Rate	$SR$	—	2.3	—	$\text{V}/\mu\text{s}$
Gain Bandwidth Product	$GBW$	—	2.8	—	MHz
Quiescent Current	$I_Q$	—	325	450	$\mu\text{A}$	Per channel ( $I_O = 0$ )

Common mistakes

Exceeding 6.0V supply rating: Unlike standard LM358 op-amps that accept up to 32V, the MCP602 absolute maximum supply voltage is $7.0\text{ V}$ . Connecting it to a 12V supply will instantly destroy the chip.
Unused op-amp left floating: Unused channels in dual op-amp packages must not be left floating. Wire the unused amplifier as a voltage follower ( $V_{OUT}$ connected to $V_{IN-}$ ) with $V_{IN+}$ connected to mid-supply ( $V_{DD}/2$ ).

Notes

Rail-to-Rail Advantage: Unlike LM358 which clips $1.5\text{ V}$ below $V_{DD}$ , the MCP602 output swings within $50\text{ mV}$ of both supply rails, maximizing ADC input range on 3.3V or 5V microcontrollers.

Interface	Dual Op-Amp Terminals (VINA+, VINA-, VOUTA, VINB+, VINB-, VOUTB)
Package	8-pin PDIP / SOIC-8 / TSSOP-8