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Cart ( ISO1212DBQR is ideal if you’re designing a digital input interface for PLCs. It converts common industrial 24V signals directly into standard logic levels for PLC or MCU inputs, offering built-in isolation to protect your main system. Wiring is simple—just connect sensors or dry contacts to the SENSE pin, set threshold voltage with two resistors, and you’re good. The OUT pin provides clean isolated digital output, perfect for reliable PLC and remote IO applications.
ISO1212DBQR Datasheet, Price, PDF
Discover the ISO1212DBQR Reference Manual to explore comprehensive technical specifications and performance details. This guide is essential for engineers seeking to optimize their designs with this high-performance component.
- Type: General Purpose
- Channel Type: Unidirectional
- Number of Channels: 2
- Package: 16-SSOP (0.154", 3.90mm Width)
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ISO1212DBQR
ISO1212DBQR is a great fit for your PLC or industrial automation projects. It offers built-in capacitive isolation up to 5000Vrms for strong interference protection. It accepts wide input voltages (9V–30V), withstands ±60V transients, and supports 12 channels conforming to IEC 61131-2 standards. It sends status signals to your MCU via SPI, reducing I/O pin usage. Lower power than traditional optocouplers, ideal for motor monitoring, limit switches, or other industrial sensors.
ISO1212DBQR Pinout
| Pin Number | Pin Name | Description |
|---|---|---|
| 1 | IN1 | Channel 1 input pin (connect to industrial signal) |
| 2 | SENSE1 | Channel 1 sensing resistor detection pin |
| 3 | THR1 | Channel 1 threshold resistor connection pin |
| 4 | GND | Input-side ground (isolated side) |
| 5 | IN2 | Channel 2 input pin |
| 6 | SENSE2 | Channel 2 sensing resistor detection pin |
| 7 | THR2 | Channel 2 threshold resistor connection pin |
| 8 | NC | Reserved, not connected |
| 9 | GND1 | Output-side ground |
| 10 | OUT2 | Channel 2 output (CMOS logic level) |
| 11 | VCC1 | Output-side power supply (2.25V–5.5V) |
| 12 | OUT1 | Channel 1 output |
| 13 | NC | Reserved, not connected |
| 14 | EN | Enable pin (active high) |
| 15 | NC | Reserved, not connected |
| 16 | GND1 | Output-side ground |
When using this chip, connect INx, SENSE, and THR pins to 24V inputs, sensors, or dry contacts via resistors to set the correct threshold. OUTx pins connect directly to MCU digital inputs. Ensure isolated power for input (VCC1/GND1). Pull EN high to enable. Pins 8, 13, and 15 are NC, leave unconnected. Carefully select RTHR and RSENSE resistors to match input voltage and prevent mis-triggering
ISO1212DBQR Equivalent Digital Isolator
| Parameter / Model | ISO1212DBQR | ADuM1442BRZ | HCPL-7520 |
|---|---|---|---|
| Package | SSOP-16 | SOIC-16 (wide) | SO-16 |
| Channel Count (Input → Output) | 4-channel input → digital output | 4-channel → unidirectional isolation | 1-channel analog isolation |
| Isolation Voltage | 4000 Vrms | 2500 Vrms | 3750 Vrms |
| Input Voltage Range | 9V – 30V (IEC 61131-2 compliant) | Standard logic input | Analog ±200mV |
| Operating Temperature | −40°C to +125°C | −40°C to +125°C | −40°C to +85°C |
| Compliant with Industrial Interface Standard | Yes (IEC 61131-2 Type 1/2/3) | No | No |
| Operating Supply Voltage (Logic Side) | 3.3V / 5V | 3.3V / 5V | 5V |
| Output Type | CMOS | CMOS | Analog Output |
| Dedicated for Industrial Digital Input | Yes | No | No |
When picking an alternative to ISO1212DBQR, first check if you need IEC 61131-2 compatibility. ADuM1442 works for basic isolation but needs extra protection for industrial signals. For industrial use, stick with ISO1211 or ISO1212 variants. Avoid HCPL-7520—it isolates analog signals, not digital inputs.
ISO1212DBQR Industrial Input Circuit
When using ISO1212DBQR, connect R_INLIMIT and R_THRESH resistors to set the input voltage range (e.g., 9-30V industrial standard). When the input exceeds your set threshold, the chip triggers internally and safely transfers the signal through capacitive isolation to the OUT pin, feeding your MCU digital input. Always isolate FGND (input side) from GND1 (output side). Add a 100nF capacitor at output side for signal stability.
ISO1212DBQR PLC Input Interface
ISO1212DBQR Wiring with Microcontroller
Using ISO1212DBQR with your MCU is easy. It safely converts 24V industrial signals into MCU-friendly logic signals. Just connect your 24V input via resistor divider to ISO1212’s SENSE and THR pins to set threshold voltage. The isolated output (OUT pin) then goes straight to your MCU’s GPIO, powered by 3.3V or 5V with a 100nF cap for decoupling. Simple, safe, perfect for PLC inputs.
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