Texas Instruments CD4098BMT

Overview

CD4098BMT from Texas Instruments is a dual monostable multivibrator IC in 16-pin SOIC (D) package, operating over -55°C to +125°C, with CMOS-compatible input thresholds and independent trigger/reset control per section. It delivers precise one-shot timing for pulse shaping and debouncing in industrial control logic.

For engineers reviewing the CD4098BMT datasheet, CD4098BMT pinout, CD4098BMT application, or CD4098BMT equivalent, key selection criteria include its dual independent monostable architecture, TTL/CMOS input compatibility, wide temperature range, and SOIC packaging for space-constrained PCB layouts.

Technical Context

The CD4098BMT implements two identical, independently triggered monostable multivibrators with Schmitt-trigger inputs and complementary Q/Q̅ outputs. Each section features separate A and B trigger inputs, an active-low reset (R̅), and timing controlled by external RC networks connected to C_EXT and R_EXT pins.

Timing pulse width is determined by τ ≈ 0.7 × R_EXT × C_EXT, with guaranteed operation across supply voltages from 3 V to 18 V and propagation delays under 400 ns at 5 V. The device is functionally identical to the CD4098B family and compatible with MC14528 in timing behavior and pin assignment.

Key Specifications

Pinout & Package

CD4098BMT is supplied in a 16-pin SOIC (D) package, 3.9 mm body width, 1.75 mm height max, with standard 1.27 mm pitch and gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4098BMT, CD4098BM96 offers production-ready packaging and lifecycle support, while MC14528BD provides military qualification and marginally tighter input hysteresis - both retain full functional equivalence for timing-critical monostable use cases.

Availability

CD4098BMT is available at Aetrix Electronics and suitable for industrial sensor interface, motor control timing, and legacy system signal conditioning requiring stable component supply and long-term obsolescence management.

Supply support for CD4098BMT 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 logic solutions, with decades of heritage in CMOS logic design and industrial-grade reliability.

The CD4098BMT belongs to TI's legacy CD4000B series of buffered CMOS logic devices, engineered for robust operation in harsh environments and designed to replace earlier 4000-series variants with improved noise immunity and wider supply tolerance.

FAQ

What is the supply voltage range supported by the CD4098BMT?

The CD4098BMT operates across a supply voltage range of 3 V to 18 V DC. This wide range allows direct integration into mixed-voltage systems, including battery-powered equipment and industrial controllers with unregulated rails. All timing parameters and input thresholds scale proportionally with V_DD, ensuring consistent behavior across the full range. The CD4098BMT maintains specified propagation delay and output drive capability throughout this span.

Is the CD4098BMT pin-compatible with other CD4098B variants?

Yes, the CD4098BMT is fully pin-compatible with all CD4098B variants in the same SOIC-16 package, including CD4098BM and CD4098BM96. Pin assignments for V_DD, V_SS, triggers, resets, outputs, and timing terminals are identical across these versions. The CD4098BMT shares the same die and functional specification - only packaging, marking, and lifecycle status differ.

Does the CD4098BMT require external components to operate?

Yes, the CD4098BMT requires external RC networks for timing: one resistor and one capacitor per monostable section connected to dedicated C_EXT and R_EXT pins. No external clock or power supply filtering is mandatory, but decoupling capacitors (e.g., 0.1 µF ceramic near V_DD/V_SS) are recommended for noise suppression. The CD4098BMT contains no internal timing elements and relies entirely on these external components for pulse width definition.

What is the maximum operating temperature for the CD4098BMT?

The CD4098BMT is rated for operation from -55°C to +125°C ambient temperature. This extended range is verified per TI's characterization and qualifies the device for deployment in demanding environments such as under-hood automotive modules, industrial motor drives, and aerospace subsystems. The CD4098BMT maintains full functionality and parameter compliance across this entire temperature span without derating.

Can the CD4098BMT be used as a missing-pulse detector?

Yes, the CD4098BMT can implement a missing-pulse detector by configuring one monostable section as a retriggerable one-shot: the incoming pulse train drives the A input, while the Q output is fed back to the B input. If pulses arrive faster than the timing interval, the output remains high; if a pulse is missed, the output falls after τ expires. This configuration uses only the CD4098BMT and two external resistors - no additional logic required.