NJM2903DQ NJR Integrated Circuit (Dual-In-Line Packages) In Stock
NJR NJM2903DQ is a dual single-supply analog voltage comparator IC in a DIP package, operating from 2 V to 36 V or ±1 V to ±18 V, featuring open-collector outputs and input common-mode range down to ground, suitable for level detection, pulse shaping, and logic interfacing circuits.
- Manufacturer
- NJR
- Package
- Dual-In-Line Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- NJM2903DQ Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Dual independent comparators in one package operating from 2 V to 36 V single supply or ±1 V to ±18 V dual supply
- Input common-mode voltage range includes ground potential, enabling direct comparison of signals near the negative rail without extra biasing
- Open-collector output stage compatible with wired-OR configurations and selectable output voltage levels from 1.5 V to 36 V
- Wide temperature range operation from -40°C to +85°C ensures reliable performance in industrial and automotive environments
Applications
The NJM2903DQ dual comparator is widely used in window detector circuits, zero-crossing detectors, and hysteresis-based Schmitt trigger designs where two independent comparator stages share a single package to reduce board space. It is commonly found in battery chargers, motor speed controllers, and power-supply supervisory circuits that compare analog voltage thresholds to generate digital control signals. The open-collector outputs make it straightforward to interface with 3.3 V and 5 V microcontroller logic in mixed-voltage systems.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for NJM2903DQ:
Frequently Asked Questions
What supply voltage range does the NJM2903DQ support, and how does that affect system design flexibility?
The NJM2903DQ operates on a single supply from 2 V to 36 V or a dual supply of ±1 V to ±18 V. This broad voltage range allows it to be used in battery-powered 3 V designs and 24 V industrial systems alike, eliminating the need for separate comparator devices in multi-voltage product families and simplifying component standardization across designs.
How does the open-collector output of the NJM2903DQ enable flexible signal interfacing?
The NJM2903DQ's open-collector outputs allow the output transistor to pull low but require an external pull-up resistor (typically 1 kΩ to 100 kΩ) to set the logic-high level. This means the output logic level can be independently set to any voltage between 1.5 V and 36 V by choosing the pull-up supply, making it easy to interface a 5 V comparator stage directly to a 3.3 V microcontroller GPIO without additional level-shifting circuitry.
For a window comparator design, how many NJM2903DQ packages are needed and what is the typical configuration?
A window comparator requires exactly 2 comparator stages, so a single NJM2903DQ package with its 2 independent comparators is sufficient. One comparator is set with the upper threshold voltage at its non-inverting input and the lower threshold at the inverting input of the second. The two open-collector outputs are wired together (wired-OR) with a single 10 kΩ pull-up resistor, generating a low output only when the input signal falls within the ±voltage window defined by the two 1% resistor dividers.
How does the NJM2903DQ compare to LM393 for a 5 V single-supply sensor threshold detection circuit?
The NJM2903DQ is a functional equivalent to the industry-standard LM393 dual comparator, operating with the same 2 V to 36 V supply range and open-collector outputs. Both have an input offset voltage below 5 mV and response times in the range of 1.3 µs at 5 V supply. Designers using LM393 layouts can substitute NJM2903DQ with no schematic or footprint change on the DIP-8 package, while benefiting from NJR's manufacturing quality and availability from authorized distributors.
Related Guides
ECMF02-4CMX8 Common-Mode Filter with ESD Protection: Selection Guide
Compare ECMF02-4CMX8 vs ECMF02-2AMX6, ECMF04-4HSM10, and other ST ECMF filters. Choose the right 4-channel common-mode filter with ESD protection for USB 2.0.
Jun 20, 2026
AD5204 Quad Digital Potentiometer Selection Guide (2026)
How to choose the right AD5204 quad digital potentiometer: compare 10kΩ vs 100kΩ variants, TSSOP vs SOIC packages, and SPI interface options for your design.
Jun 20, 2026
0402 10uF X5R Decoupling Design Guide for Compact Digital Rails
Application note for using CL05A106MP5NUNC-class 0402 10uF X5R MLCCs in compact digital rail decoupling designs.
Jun 19, 2026
How to Choose an 0805 10uF MLCC for Decoupling and Bulk Capacitance
Selection guide for choosing 0805 10uF MLCCs around CL21A106KOQNNNE, covering derating, dielectric, package, and sourcing checks.
Jun 19, 2026
Why Buy from FindMyChip
About NJR
NJR is a leading electronic component manufacturer. FindMyChip sources NJR ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“Their engineering team helped us find a pin-compatible alternative when our original MCU went EOL.”