MC1489DG - Quad EIA-232D Line Receiver | onsemi
MPN: MC1489DG ✓ ActiveMC1489DG Overview
An EIA-232D line receiver is an interface circuit that converts bipolar RS-232 signals into digital logic levels. It belongs to the receiver category within the broader RS-232 interface IC family. Because RS-232 uses voltage levels and signal conventions that differ from TTL and CMOS logic, a receiver is required between a physical communications port and the digital electronics that process the data.
The MC1489DG's four independent receiver sections allow one package to serve several communications channels or several distinct RS-232 ports. Its plus or minus 30 V input signal range provides margin for the voltage excursions encountered in EIA-232D systems. The 3.0 kOhm to 7.0 kOhm input-resistance range identifies the device as a bipolar line receiver rather than a low-voltage CMOS transceiver.
The 14-pin SOIC is a surface-mount package suitable for conventional PCB assembly and automated production. Its 0.154 inch pitch matches the widely used narrow-body SOIC footprint family, while the 3.90 mm body width supports compact placement compared with older through-hole receiver packages. Each receiver channel requires the correct external connection and signal conditioning defined by the system interface.
Typical uses include RS-232 links between industrial equipment and computers, legacy peripheral ports, point-of-sale equipment, data acquisition systems, and embedded-control consoles. The quad organization is especially useful where four RS-232 inputs must be accepted without installing four separate receiver packages. Designers should still verify channel direction, grounding, signal polarity, and timing against the circuit being interfaced.
A key design consideration is that MC1489DG is a receive-only interface. It does not provide the transmit functions required for a complete bidirectional RS-232 port. A separate line driver or transceiver is needed for outbound data. Board design must also preserve adequate spacing and signal return paths so large RS-232 voltage transitions do not create unwanted coupling into nearby low-level circuits.
This product page combines manufacturer interface information, package details, application guidance, and focused replacement comparisons for engineers evaluating the MC1489DG in legacy and industrial RS-232 equipment.
Drop-in alternatives for MC1489DG — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
MC1489AD
✅ Drop-In📋 Reference alternative (not in catalog)
SN75C189D
✅ Drop-In📋 Reference alternative (not in catalog)
MC1489DG Specifications
| Receiver Configuration | 4 channels |
| Interface Standard | EIA-232D |
| Input Resistance | 3.0 kOhm to 7.0 kOhm |
| Input Signal Range | plus or minus 30 V |
| Package | 14-SOIC |
| Number of Pins | 14 pins |
| Package Width | 3.90 mm |
| Lead Pitch | 0.154 inch |
| Mounting Type | Surface mount |
| Device Type | Quad line receiver |
| Architecture | Monolithic |
MC1489DG 3.90 mm Pin Configuration Guide
Pin configuration for MC1489DG (3.90 mm package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for MC1489DG.
Refer to the datasheet for full pin configuration.
Typical Applications
MC1489DG is suitable for 6 applications: Legacy RS-232 Data Acquisition, Industrial Control Console, Point-of-Sale Peripheral Interface, Embedded Equipment Configuration Port, Data Communications Test Equipment, Security and Access Control Interface.
Legacy RS-232 Data Acquisition
The MC1489DG is appropriate for receiving up to four bipolar EIA-232D signals in laboratory and industrial data-acquisition equipment. Its documented input signal range of plus or minus 30 V accommodates the voltage excursions associated with RS-232, while its four-channel monolithic organization reduces the number of separate receiver packages. According to the onsemi MC1489 datasheet, the input resistance spans 3.0 kOhm to 7.0 kOhm. The design should preserve the receiver ground reference, route each interface away from sensitive analog circuitry, and use the manufacturer pin configuration when assigning the four channels.
Recommended
Industrial Control Console
The MC1489DG can provide four receive channels for an industrial control console that accepts commands or status signals from older RS-232 equipment. Its 14-SOIC package supports compact surface-mount assembly, and the plus or minus 30 V input range provides compatibility with standard bipolar RS-232 signaling. The four receiver channels are useful when several ports share one logic board. Engineers should maintain separation between interface traces, provide a stable signal ground, and verify that the host interface timing remains compatible with the MC1489 output characteristics before production release.
Recommended
Point-of-Sale Peripheral Interface
The MC1489DG suits point-of-sale and peripheral systems that retain an EIA-232D receive port while using modern control electronics internally. Four independent receiver channels can handle multiple incoming peripheral signals in one 14-SOIC package, and the input signal range of plus or minus 30 V supports the voltage levels expected from the communications port. According to the onsemi MC1489 datasheet, the device is designed for data-terminal and data-communications equipment. Layout should use short return paths and controlled connector grounding to prevent interface transients from coupling into the main digital system.
Recommended
Embedded Equipment Configuration Port
The MC1489DG can be used as the receive section of an embedded equipment configuration or service port connected to a legacy service terminal. Its four receiver channels allow one package to monitor several RS-232 inputs, while the narrow-body SOIC format conserves board area. The plus or minus 30 V input range and 3.0 kOhm to 7.0 kOhm input-resistance range are the principal compatibility characteristics identified by onsemi. Designers should confirm logic levels, enable behavior, and channel polarity in the manufacturer pin table and should not use the receiver alone as a transmit driver.
Recommended
Data Communications Test Equipment
The MC1489DG is suitable for test and measurement equipment that must interrogate or monitor multiple EIA-232D-compatible devices. Four integrated receiver channels simplify channel allocation across a test fixture, while the surface-mount 14-SOIC package supports automated assembly. According to the onsemi MC1489 datasheet, the receiver accepts plus or minus 30 V signals and was designed for data-terminal and data-communications interfaces. For bench instrumentation, keep test-return currents controlled, use a common signal ground with the equipment under test, and validate logic thresholds against every peripheral that can be connected.
Recommended
Security and Access Control Interface
The MC1489DG can support legacy access-control readers, alarm panels, or security equipment that expose an RS-232 receive interface. Its four receiver channels provide a compact way to accept multiple status inputs, and the rated input signal range of plus or minus 30 V suits the bipolar communications environment. The onsemi MC1489 datasheet identifies the MC1489 as a monolithic quad EIA-232D line receiver. Installation practice should include protected connector routing, reliable equipment grounding, and verification of enable polarity so inactive inputs do not create unintended system states.
Recommended
Recommended Products Summary
Engineering reference data for MC1489DG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC1489AD | SN75C189D |
|---|---|---|---|
| Brand | onsemi | onsemi | Texas Instruments |
| Package | 14-SOIC | 14-SOIC | 14-SOIC |
| Receiver Channels | 4 channels | 4 channels | 4 channels |
| Interface Standard | EIA-232D | EIA-232D family | EIA-232-F |
| Lead Pitch | 0.154 inch | 0.154 inch | 0.154 inch |
Key Differentiators
- Four EIA-232D receiver channels in one package (vs SN75C189D)
- Direct onsemi family migration path (vs MC1489AD)
- Established bipolar receiver specification (vs SN75C189D)
Design Notes
Assign the four MC1489DG receiver inputs directly from the numbered manufacturer pin diagram and keep connector-side traces away from clocks, sensor inputs, and precision analog paths. RS-232 inputs can transition through a plus or minus 30 V range, so a short return path and an uninterrupted interface ground are important. Place any protection components at the connector boundary and keep their current path away from the receiver and downstream logic sections.
Do not treat the plus or minus 30 V input signal range as the IC supply rating or connect those voltages to a 5 V or 3.3 V rail. The MC1489DG is receive-only, so each bidirectional port also requires a line driver. Before substituting a different receiver, compare pin functions, enable polarity, input thresholds, hysteresis, supply requirements, and temperature ratings; matching the 14-SOIC outline alone does not guarantee functional interchangeability.
Route each EIA-232D receive line as a driven signal with its associated ground reference, and avoid sharing long return paths with switching or high-current loads. Place the receiver near the connector when cable transients are likely, allowing short protected traces and more separation from sensitive logic downstream. Validate the completed assembly for receiver chatter, false transitions, and susceptibility to adjacent switching activity rather than relying only on nominal threshold measurements.
Follow the manufacturer land pattern for the 14-pin, 0.154 inch pitch SOIC and verify the exact pin-one orientation during footprint creation. The package body is approximately 3.90 mm wide, so mechanical clearance around the leads and connector should be checked for assembly tooling. Use thermal relief and via placement appropriate for normal leaded-package soldering, while observing the manufacturer's reflow profile and moisture-handling requirements for the ordered device.
Compliance Information
The MC1489DG is an industrial legacy EIA-232D interface receiver; no specific RoHS, REACH, halogen-free, conflict-minerals, or AEC-Q100 status is stated in the available manufacturer information. Verify current environmental declarations with onsemi for the exact ordering code and shipment configuration.
