Texas Instruments CD4098BF

Overview

CD4098BF from Texas Instruments is a dual monostable multivibrator IC in a 16-lead ceramic dual-in-line package (CDIP), operating across -55°C to +125°C, with TTL/CMOS-compatible inputs, independent trigger and reset control per section, and propagation delay of 300 ns typical at 5 V. It serves in precision timing, pulse shaping, and debouncing circuits for aerospace and industrial control systems.

For engineers reviewing the CD4098BF datasheet, CD4098BF pinout, CD4098BF application, or CD4098BF equivalent, key selection considerations include its hermetic CDIP packaging for high-reliability environments, dual independent monostable operation with retriggerable capability, and compatibility with legacy 4000B-series logic voltage levels and timing constraints.

Technical Context

The CD4098BF implements two identical, independently operable monostable multivibrators, each with separate A and B trigger inputs, reset input, Q and Q̅ outputs, and external RC timing network connections. Each section supports both edge-triggered (A) and level-triggered (B) activation modes.

Timing is set by external R and C components connected to pins 1–2 (Section 1) and pins 13–14 (Section 2), with output pulse width determined by τ ≈ 0.45 × R × C. The device uses standard CMOS silicon-gate technology and exhibits rail-to-rail output swing with low static current draw (≤ 100 nA at 5 V).

Key Specifications

Pinout & Package

CD4098BF is housed in a 16-lead ceramic dual-in-line package (CDIP, J suffix), with 0.3-inch body width, 0.1-inch lead pitch, and hermetic glass-seal construction suitable for high-reliability and space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual monostable multivibrator applications.

Compared with JM38510/17504BEA, CD4098BF offers identical performance and packaging but lacks formal QML-38535 certification; compared with CD4098BE, CD4098BF provides superior environmental robustness via ceramic hermetic seal and extended temperature support, at the cost of RoHS compliance.

Availability

CD4098BF is available at Aetrix Electronics and suitable for aerospace avionics, military communications, and industrial motion control requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for CD4098BF 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 logic ICs with leadership in high-reliability and industrial-grade components.

The CD4000B series - including CD4098BF - was designed for robust, low-power digital timing and control in mission-critical systems where latch-up immunity, wide voltage operation, and temperature resilience are mandatory.

FAQ

What is the maximum operating temperature for CD4098BF?

The CD4098BF is rated for continuous operation from -55°C to +125°C. This extended temperature range is enabled by its ceramic dual-in-line package (CDIP) and CMOS process design, making it suitable for deployment in engine compartments, avionics bays, and other thermally demanding environments where the CD4098BF must maintain timing accuracy without derating.

Does CD4098BF support retriggerable monostable operation?

Yes, the CD4098BF supports fully retriggerable operation on both monostable sections. When a new trigger is applied during an active output pulse, the CD4098BF restarts the timing cycle from that instant - a behavior confirmed in the Harris Semiconductor datasheet SCHS065C. This ensures reliable pulse stretching in applications like switch debouncing or event synchronization where input jitter is present.

Is CD4098BF RoHS compliant?

No, CD4098BF is not RoHS compliant. Its lead finish is SnPb (tin-lead), as specified in TI's Packaging Information document for orderable part CD4098BF. This leaded finish meets MIL-STD-883 requirements for high-reliability solder joints but excludes it from RoHS-restricted applications unless exempted under Annex III or VII.

Can CD4098BF replace CD4098BE in an existing design?

CD4098BF can replace CD4098BE electrically and pin-for-pin, but requires validation of thermal and environmental requirements. While both share identical logic function, timing specs, and pinout, CD4098BF uses a hermetic CDIP package rated for -55°C to +125°C, whereas CD4098BE uses a plastic DIP rated only to +85°C. The CD4098BF also uses SnPb leads versus RoHS-compliant NiPdAu on CD4098BE.

What external components are required for CD4098BF timing operation?

The CD4098BF requires two external RC networks - one per monostable section - connected to Pins 1–2 (Section 1) and Pins 15–16 (Section 2). Each network sets output pulse width using τ ≈ 0.45 × R × C. Resistors should be ≤ 10 MΩ and capacitors ≥ 10 pF for stable operation; values are selected based on desired timing resolution and temperature stability requirements for the CD4098BF implementation.