Texas Instruments CD4098BF3A

Overview

CD4098BF3A 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 output pulse widths programmable via external RC networks. It serves as a precision timing element in digital logic systems requiring stable, repeatable one-shot pulses.

For engineers reviewing the CD4098BF3A datasheet, CD4098BF3A pinout, CD4098BF3A application, or CD4098BF3A equivalent, key selection considerations include its military-grade hermetic CDIP packaging, wide temperature range, dual independent monostable operation, and compatibility with legacy 4000B-series logic families in high-reliability industrial and aerospace timing circuits.

Technical Context

The CD4098BF3A implements two identical, independently operable monostable multivibrators in a single IC. Each section features separate positive-edge-trigger (A) and negative-edge-trigger (B) inputs, active-low reset, and complementary Q and Q̅ outputs. Timing is determined solely by external R and C components connected to each section's RC pins.

No internal timing elements are present; all pulse width generation relies on user-selected RC networks. The device uses standard CMOS silicon-gate technology, ensuring low static power consumption (<1 µA at 5 V), high noise immunity, and rail-to-rail output swing compatible with both CMOS and TTL loads.

Key Specifications

Pinout & Package

CD4098BF3A is supplied in a 16-lead hermetic ceramic dual-in-line package (CDIP-J), with 0.3-inch body width, 0.1-inch lead pitch, and SNPB (tin-lead) solder finish. The package is non-RoHS compliant and rated for high-reliability, long-lifetime deployments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4098BF3A, JM38510/17504BEA offers identical functionality with formal QML pedigree for defense programs, while CD4098BE provides a lower-cost, RoHS-compliant alternative for less demanding environments - neither is pin-compatible without verifying board layout clearance for CDIP vs PDIP footprint differences.

Availability

CD4098BF3A is available at Aetrix Electronics and suitable for industrial motion control, aerospace avionics, and defense radar systems requiring stable component supply, long-lifecycle support, and hermetic packaging integrity.

Supply support for CD4098BF3A 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-reliability logic solutions, with over 50 years of heritage in precision timing and radiation-tolerant design.

The CD4098B family was developed to deliver rugged, temperature-stable monostable timing in legacy and upgrade paths for military, aerospace, and critical infrastructure systems relying on 4000-series CMOS architecture.

FAQ

What is the maximum operating frequency of the CD4098BF3A?

The CD4098BF3A does not operate at a fixed clock frequency; it is a monostable multivibrator whose output pulse width is determined by external RC components. Its propagation delay is typically 300 ns at 10 V, enabling reliable triggering up to ~1 MHz in repetitive one-shot configurations. The CD4098BF3A itself contains no internal oscillator and responds only to edge-trigger events.

Is the CD4098BF3A RoHS compliant?

No, the CD4098BF3A is not RoHS compliant. It uses a tin-lead (SNPB) lead finish and is packaged in a hermetic ceramic dual-in-line (CDIP-J) case, which falls under RoHS exemption 7a. This makes the CD4098BF3A suitable for high-reliability applications where leaded finishes are required for solder joint integrity and thermal fatigue resistance.

Can the CD4098BF3A replace the MC14528 in existing designs?

Yes, the CD4098BF3A is functionally equivalent to the MC14528 and shares identical pinout, timing behavior, and electrical specifications. Both devices implement dual edge-triggerable monostables with independent RC timing. However, the CD4098BF3A uses TI's 4000B-series process and operates across a wider voltage range (3–18 V vs. 5–15 V), making the CD4098BF3A a direct functional upgrade in most MC14528 applications.

What is the purpose of the dual trigger inputs (A and B) on each section of the CD4098BF3A?

Each section of the CD4098BF3A has two trigger inputs: A accepts positive-edge transitions and B accepts negative-edge transitions. This allows flexible synchronization to either rising or falling edges of incoming signals without external inverters. In the CD4098BF3A, only one trigger input per section should be used at a time to avoid metastability; unused inputs must be tied to V_DD or V_SS.

Does the CD4098BF3A require external components to function?

Yes, the CD4098BF3A requires external resistors and capacitors connected to its RC pins to define output pulse width (t_W ≈ 0.45 × R × C). It also requires a 0.1 µF ceramic decoupling capacitor between V_DD (pin 16) and V_SS (pin 8). No pull-up or pull-down resistors are needed on trigger or reset inputs due to built-in CMOS input structure - the CD4098BF3A functions autonomously once powered and configured.