Texas Instruments SE529K

Overview

SE529K 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 SE529K datasheet, SE529K pinout, SE529K application, or SE529K equivalent, key selection criteria include strobe-controlled output enable, tight 5 ns max A/B output skew, ±6V input common-mode range, and compatibility with op-amp supply rails in high-reliability industrial timing systems.

Technical Context

The SE529K implements a fully differential input stage with independent strobe control per output, enabling synchronized latching in high-speed data acquisition. Its architecture delivers matched propagation paths for complementary outputs, ensuring ≤5 ns inter-output skew under all operating conditions.

It operates across ±15V analog supplies while generating TTL-level outputs referenced to a separate +5V VCC rail, supporting mixed-signal system interfacing without level-shifting. Input offset voltage is specified at 5 mV max, and input bias current remains below 30 μA over temperature.

Key Specifications

Pinout & Package

SE529K is supplied in TO-100 metal-can package (Package Number LME0010C), 10-pin hermetically sealed can with center tab grounded. Pin 1 is identified by dot marking; leads are arranged radially with staggered spacing for wire-bond compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM161H and LM361M/NOPB, the SE529K uniquely combines hermetic TO-100 packaging, full military temperature range, and dual independent strobes - making it the only choice for high-reliability, strobe-gated, high-speed comparator applications in aerospace and defense systems.

Availability

SE529K is available at Aetrix Electronics and suitable for disk drive controller design, motor phase monitoring, high-speed test equipment, and aerospace data acquisition systems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for SE529K 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 company founded in 1930, specializing in analog, embedded processing, and high-performance analog ICs for industrial, automotive, and aerospace markets.

The SE529K belongs to TI's legacy high-speed comparator family designed specifically for precision timing-critical systems requiring deterministic propagation delay, low skew, and robust operation in extreme thermal and EMI environments.

FAQ

What is the maximum operating temperature range for the SE529K?

The SE529K is rated for operation from −55°C to +125°C, meeting military-grade environmental specifications. This range is confirmed in the Absolute Maximum Ratings table and Operating Conditions section of the original National Semiconductor datasheet (SNOSBJ5C), and applies specifically to the TO-100 packaged SE529K variant. The extended temperature capability is enabled by its hermetic metal-can construction and internal compensation design.

Does the SE529K require external pull-up resistors on its TTL outputs?

No, the SE529K does not require external pull-up resistors. Its complementary TTL outputs are actively driven - Logical "1" output voltage is guaranteed ≥2.4V at −0.5 mA source current, and Logical "0" is ≤0.4V at 6.4 mA sink current. This active drive eliminates need for external components and ensures compatible interfacing with standard 74LS/74ALS logic families without additional buffering.

Is the SE529K pin-compatible with the NE529 comparator?

Yes, the SE529K is explicitly documented as a pin-for-pin replacement for the NE529, with identical TO-100 pinout, terminal functions, and supply connections. TI's datasheet states it "is a pin-for-pin replacement" and highlights improvements in speed (20 ns vs. older NE529 spec), input offset, and delay stability - all while maintaining mechanical and electrical compatibility with existing NE529 layouts and schematics.

What is the purpose of the separate VCC pin on the SE529K?

The SE529K uses a dedicated VCC pin (Pin 9) to power its TTL output drivers and strobe input circuitry independently from its ±15V analog supply rails. This separation prevents digital switching noise from coupling into sensitive analog comparators and ensures stable TTL logic levels regardless of analog supply loading. VCC must be supplied with +5V ±5%, as specified in the Operating Conditions table.

Can the SE529K operate with asymmetric supply voltages such as +12V/−5V?

No - the SE529K is characterized and specified only for symmetric dual supplies (e.g., ±5V, ±12V, ±15V). The Absolute Maximum Ratings list +16V and −16V limits individually, but the Electrical Characteristics tables and application examples assume balanced rails. Asymmetric operation is not tested or guaranteed; input common-mode range and output swing may degrade outside the symmetric condition defined in the datasheet.