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
- Price
- From $0.2147(MOQ 2000)
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of NJM2903DQ?
- 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
What is NJM2903DQ used for?
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) |
What are equivalent replacements for NJM2903DQ?
Compatible alternatives and drop-in replacements for NJM2903DQ:
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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.
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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.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 2000+ | $0.2664 | $532.84 |
| 4000+ | $0.2169 | $867.48 |
| 6000+ | $0.2158 | $1294.62 |
| 8000+ | $0.2147 | $1717.28 |
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