Texas Instruments LM529CN

Overview

LM529CN from Texas Instruments is a high-speed differential comparator with complementary TTL outputs, ±15V dual-supply operation, 20 ns max propagation delay, and low 3 ns delay variation over 5–500 mV input overdrive - used in disk file zero-crossing detection and flash ADC front-ends.

For engineers reviewing the LM529CN datasheet, LM529CN pinout, LM529CN application, or LM529CN equivalent, key selection criteria include strobe-enabled output control, tight 5 ns max A/B output skew, ±6V input common-mode range, and compatibility with op-amp supply rails in real-time analog signal conditioning systems.

Technical Context

The LM529CN implements a fully differential input stage with independent strobe control per output, enabling gated comparison windows in time-critical sampling circuits. Its complementary TTL outputs drive fanout-1 loads with 2.4 V min VOH at −0.5 mA and 0.4 V max VOL at 6.4 mA sink current.

It operates across ±5V to ±15V supplies with VCC = 5 V, delivering 14 ns typical propagation delay (tpd(0)/tpd(1)) and 2 ns typical inter-output delay skew - optimized for minimal timing uncertainty in high-resolution data acquisition.

Key Specifications

Pinout & Package

LM529CN is supplied in a 14-pin PDIP (Plastic Dual In-line Package) with 0.3-inch body width and through-hole mounting. Pin 1 is marked by a notch or dot; package conforms to JEDEC MS-001 standard.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed differential comparator applications.

Compared with LM529CN, LM361N/NOPB offers identical functionality with active supply chain support and updated packaging, while LM161H/NOPB adds extended temperature capability without sacrificing speed or precision - both retain pin-for-pin compatibility and require no schematic or layout revision.

Availability

LM529CN is available at Aetrix Electronics and suitable for disk drive controllers, flash ADC subsystems, PWM timing monitors, and motor phase detection requiring stable component supply and long-term obsolescence management.

Supply support for LM529CN 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 high-performance signal chain solutions with over 50 years of innovation in precision analog ICs.

The LM529CN belongs to TI's legacy high-speed comparator family designed for real-time analog decision-making in data acquisition, storage, and motion control systems where nanosecond timing fidelity is critical.

FAQ

What is the maximum operating supply voltage for the LM529CN?

The LM529CN supports ±15 V maximum supply rails (V+ and V−), with absolute maximum ratings of +16 V and −16 V respectively. Exceeding these limits risks permanent damage. The device is specified for reliable operation at ±5 V to ±15 V, making it compatible with standard op-amp power domains without additional regulation. LM529CN maintains full AC performance across this range, including 20 ns max propagation delay at ±10 V.

Does the LM529CN support independent enable control for each output?

Yes, the LM529CN provides two dedicated strobe inputs - STB A (Pin 3) and STB B (Pin 10) - each controlling one complementary TTL output independently. When a strobe pin is pulled low, its corresponding output enters high-impedance state; when high, the output responds to the differential input. This enables flexible timing arbitration in multi-channel systems. LM529CN's strobe thresholds (VIL = 0.8 V, VIH = 2.0 V) match standard 5 V TTL logic levels.

What is the input common-mode voltage range of the LM529CN?

The LM529CN accepts input common-mode voltages from −6 V to +6 V relative to V−, independent of supply voltage within its operating range. This wide range allows direct interfacing with high-swing sensors or op-amp outputs without attenuation or level shifting. The specification is verified across temperature and process corners, and LM529CN maintains <5 mV input offset voltage throughout this range, ensuring consistent threshold accuracy.

Is the LM529CN pin-compatible with newer TI comparators like the LM361 series?

Yes, the LM529CN is pin-compatible with the LM361N/NOPB and LM161H/NOPB in the 14-pin PDIP package - all share identical pin assignments, electrical characteristics, and functional behavior. TI explicitly states LM529CN is a predecessor to LM361 with "pin-for-pin replacement" status. LM529CN users can migrate to LM361N/NOPB without PCB redesign, benefiting from active manufacturing and RoHS compliance while retaining identical timing and drive capability.

What thermal considerations apply to the LM529CN in continuous operation?

The LM529CN has a maximum power dissipation of 600 mW and operates from 0°C to +70°C. At full ±15 V supply and 5 V VCC, typical total supply current is ~20 mA, yielding ~300 mW dissipation - well within safe limits for standard PDIP mounting on FR-4 with 1–2 cm² copper pour. No heatsink is required, but thermal vias under the GND (Pin 6) and V− (Pin 5) pads improve reliability. LM529CN's thermal impedance is not specified separately, but junction-to-ambient rise remains <20°C under typical board conditions.