Texas Instruments LM3916N-1

Overview

LM3916N-1 from Texas Instruments is a logarithmic dot/bar display driver IC that converts analog input voltage into a 10-segment LED bar or moving-dot visual indication with ±0.25 dB absolute accuracy at mid-scale, 3V–25V single-supply operation, and ±35V input tolerance-used in audio VU meters, power level indicators, and battery monitors.

For engineers reviewing the LM3916N-1 datasheet, LM3916N-1 pinout, LM3916N-1 application, or LM3916N-1 equivalent, this page delivers verified technical context, pin-level design meaning, real-world application cards, and two validated alternative parts for logarithmic LED display systems requiring stable threshold accuracy and cascaded dynamic range extension.

Technical Context

The LM3916N-1 integrates a high-impedance input buffer, precision 10-step logarithmic voltage divider (8–17 kΩ total), and ten open-collector NPN output drivers with current regulation via reference pin loading. Its internal 1.25V adjustable reference sets full-scale from 1.2V to 12V independent of supply voltage.

Pin 9 controls mode selection: tied to V+ enables bar graph display; left open enables dot mode. Cascading supports up to 70 dB range using multiple LM3916 or mixed LM3915/LM3916 configurations, with carry logic ensuring seamless transition between devices in dot mode.

Key Specifications

Pinout & Package

LM3916N-1 is housed in an 18-lead plastic dual in-line package (PDIP), with pin 1 at top-left when notch faces upward. Pin functions are validated per TI SNVS762B Rev. March 2013.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar logarithmic LED display driver applications.

Compared with LM3915N-1 and LM3914N-1, the LM3916N-1 uniquely delivers logarithmic response optimized for audio and RF signal representation-its ±0.25 dB mid-scale accuracy and ±35 V input tolerance make it irreplaceable in VU meter and spectrum display designs where perceptual fidelity and robustness are mandatory.

Availability

LM3916N-1 is available at Aetrix Electronics and suitable for audio instrumentation, battery management systems, and RF test equipment requiring stable component supply, long-lifecycle availability, and consistent parametric performance across production batches.

Supply support for LM3916N-1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and digital signal technologies with decades of precision analog IC heritage.

The LM3916N-1 belongs to TI's legacy analog display driver family designed specifically for high-fidelity, zero-software LED-based signal level visualization in professional audio, test & measurement, and industrial monitoring systems.

FAQ

What is the primary function of the LM3916N-1?

The LM3916N-1 is a monolithic logarithmic dot/bar display driver IC that converts an analog input voltage into a 10-segment LED visual output. It features built-in voltage reference, precision resistor ladder, and regulated current outputs-enabling direct LED drive without external current-limiting resistors. The LM3916N-1 is engineered for applications like VU meters and signal strength indicators where perceptually uniform dB scaling is essential.

How does the LM3916N-1 differ from the LM3915N-1 and LM3914N-1?

The LM3916N-1 implements logarithmic 3 dB/step scaling optimized for audio and RF signal representation, whereas the LM3915N-1 uses linear 3 dB/step and the LM3914N-1 uses linear 1 V/step scaling. All three share the same PDIP-18 package and core architecture-including pin-compatible pinout, supply range (3–25 V), and LED current programming method-but only the LM3916N-1 delivers true logarithmic response with ±0.25 dB accuracy at mid-scale.

Can the LM3916N-1 operate from a 3.3 V supply?

Yes, the LM3916N-1 is fully specified to operate from 3 V to 25 V single supply. At 3.3 V, the input buffer accepts signals from GND to 1.8 V, and the internal reference can be configured for full-scale voltages as low as 1.2 V. LED current must be reduced (e.g., to 1–5 mA) to maintain safe power dissipation; the LM3916N-1's current regulation remains functional across the entire supply range.

What is the role of pin 9 on the LM3916N-1?

Pin 9 is the Mode Select input that determines whether the LM3916N-1 operates in bar graph or moving dot display mode. When pin 9 is tied to V+ (within 20 mV), the device enters bar mode-illuminating all LEDs up to and including the active threshold. When pin 9 is left open or pulled ≥200 mV below V+, it enters dot mode-lighting only the single LED corresponding to the active threshold. This hardware-selectable feature requires no external logic or configuration.

Is the LM3916N-1 suitable for cascading multiple displays?

Yes, the LM3916N-1 supports cascading in both bar and dot modes. In dot mode, pin 1 (carry sense) and pin 9 (mode select) enable automatic disabling of the final LED on the lower device when the first LED on the next device activates-ensuring seamless transitions. Cascaded LM3916N-1 units achieve up to 70 dB dynamic range; mixed configurations with LM3915N-1 further extend resolution and range for precision VU and PPM meters.