Rochester Electronics, LLC CA3098E

The CA3098 compares an input against high and low reference levels, then uses a bistable memory element to retain the resulting state. A programmable bias-current pin lets the designer trade operating current against response behavior. The output stage can sink load current for control applications. This is an analog threshold and control IC, not an ordinary logic Schmitt inverter or a complete relay driver module.

• Dual-reference level detection with memory and built-in hysteresis.
• Programmable operating current through the IBIAS connection.
• Single-supply or split-supply operation within manufacturer limits.
• Output stage intended to sink currents up to the data-sheet maximum.
• Industrial and high-temperature legacy control applications using the 8-pin PDIP E version.

The original Intersil diagram shows two differential amplifiers comparing the input with high and low references, a summing trigger circuit, a flip-flop and a driver/output stage. Hysteresis and the flip-flop reduce unwanted chatter around a threshold. The data sheet quotes up to 16 V single-supply or ±8 V dual-supply operation and up to 150 mA peak output sink capability under its stated conditions. Verify bias selection, load energy and timing against the full tables before use.

The Renesas-hosted Intersil part-number table identifies CA3098E as an 8-lead PDIP, package E8.3. The local catalog package field is blank. A generic 8-DIP entry exists in the local package register, but its corresponding `8-DIP.jpg` is missing. Confirm the E8.3 dimensions, pin-one orientation and through-hole pattern before assembly.

Assembly checks

• Verify E8.3 mechanical dimensions and pin-one mark.
• Check socket or PCB hole pattern against the controlled drawing.
• Apply ESD handling for the obsolete device.

The original 8-pin top view assigns low reference and high reference inputs, +IN, IBIAS, OUT, V+, V- and current-control functions. Use the manufacturer's pin-numbered diagram, application circuits and electrical limits for wiring; the description here is not a replacement for the complete pinout or load-protection design.

Separate recommended-operation, absolute-maximum and load-current conditions must not be conflated. Validate full DC/AC tables for the application circuit.

Renesas marks the original CA3098 obsolete and specifies no recommended replacement. The checked local candidate models CA3098, CA3098E-G and CA3098M were not found in the internal database, so no alternate product link is offered. Any substitute requires electrical qualification of reference thresholds, hysteresis, memory behavior, bias, output load, supply range, temperature and PDIP pinout.

The original Intersil CA3098 data sheet, now hosted by Renesas, provides the CA3098E ordering line, functional diagram, pinout, electrical data and application examples. The local catalog names Rochester Electronics as the current supply source rather than the original circuit designer. Preserve manufacturer provenance and obtain traceable stock documentation for this obsolete component.

• Threshold and level detection in legacy industrial controls.
• Relay, lamp, LED or solenoid switching with suitable external protection.
• Overvoltage, overcurrent and overtemperature trip circuits.
• Time-delay and waveform-generation circuits documented by the manufacturer.

The local catalog lists 3,878 units at USD 14.33, minimum quantity one and no tier ladder. A DigiKey Marketplace exact-code listing for Rochester inventory showed USD 30.15 at ten units, with stock views varying between 3,504 and 3,854 units. Those figures do not validate the local quantity or price. The local values are left unchanged pending a current dated quote, lot and condition confirmation, and a clear separation of Rochester Marketplace stock from local inventory.

Verify supply and bias limits, threshold behavior, output-current conditions, load protection, E8.3 package drawing and exact lot provenance. Restore the local 8-DIP JPG and reconcile current stock and pricing. Keep this draft in manual review with noindex; do not publish until every required check passes.