MC3437L - Hex Bus Receiver with Input Hysteresis | Motorola
MPN: MC3437L ✗ End of LifeMC3437L Overview
A bus receiver is an interface IC that converts a digital logic signal into a cleaner, standardized receiver output. The MC3437L belongs to the receiver and transceiver category, providing six receiver channels rather than a general-purpose analog function. Input hysteresis creates a defined transition region between low and high input levels, helping prevent output chatter when a noisy or slowly changing signal crosses the logic threshold.
The verified search data specifically identifies the MC3437 as a Hex Bus Receiver with Input Hysteresis. The MC3437L ordering variant is shown by DigiKey as a 0/6 Receiver in a 16-CDIP package. The available source data does not provide detailed input thresholds, propagation delays, supply-voltage limits, output levels, temperature ratings, or absolute maximum ratings, so those values are not inferred here.
Typical uses include digital control buses, computer peripheral interfaces, industrial equipment, communications equipment, and legacy systems where a six-channel receiver is useful. The CDIP package supports through-hole PCB assembly and may be preferred for repair, prototyping, and systems that use conventional DIP-compatible footprints. Actual signal integrity and system compatibility require checking the original manufacturer datasheet and the host bus voltage and timing.
When replacing MC3437L, verify the exact pinout, logic polarity, supply requirements, propagation delay, and input thresholds before substitution. Do not assume that a similarly named transceiver or receiver is pin-compatible. The available source data does not establish lifecycle status, detailed electrical ratings, or a verified five-part drop-in replacement set.
Drop-in alternatives for MC3437L — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
MC3437
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC3437L Specifications
| Device Type | Hex bus receiver |
| Receiver Configuration | 6 receiver channels |
| Input Feature | Input hysteresis |
| Logic Classification | 0/6 receiver |
| Package | 16-pin CDIP |
| Mounting Type | Through-hole |
| Manufacturer | Motorola |
| Product Function | Digital bus signal reception and conditioning |
| RoHS Status | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | not_applicable |
| Pin Count | 16 pins |
MC3437L 16-pin cdip Pin Configuration Guide
Pin configuration for MC3437L (16-pin cdip 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 MC3437L.
Refer to the datasheet for full pin configuration.
Typical Applications
MC3437L is suitable for 6 applications: Digital Bus Signal Conditioning, Legacy Computer Peripheral Interface, Industrial Control Interface, Communications Equipment, Embedded Control Systems, Instrumentation and Test Equipment.
Digital Bus Signal Conditioning
The MC3437L is suitable for receive-only digital bus interfaces where six signals need conditioning before reaching downstream logic. Its verified input-hysteresis feature helps separate recognized logic states when the bus contains moderate noise or ringing. Install the receiver close to the connector or bus routing so the input traces remain short, and terminate or bias the bus according to the original system specification. Before layout release, confirm the MC3437L pinout, supply voltage, logic thresholds, and propagation delay from the manufacturer datasheet, since those values are not included in the supplied web data.
Recommended
Legacy Computer Peripheral Interface
The MC3437L can be used in legacy computer peripheral cards and interface boards that require multiple digital receive channels. Its 16-pin CDIP package is convenient for through-hole repair and prototype assembly, while input hysteresis helps reduce uncertain switching near a logic threshold. The designer should confirm that the peripheral bus voltage and timing fall within the original MC3437 specifications. The supplied results identify the package and receiver function but do not establish operating voltage, temperature, or timing, so bench validation is required before production use.
Recommended
Industrial Control Interface
The MC3437L may fit a legacy industrial control interface when the system uses a compatible digital bus and requires six receiver channels. Input hysteresis is useful in environments where the receiver must distinguish logic states despite electrical noise. However, the supplied data does not verify industrial temperature range, ESD performance, supply tolerance, or isolation, so it should not be approved for new safety- or mission-critical equipment without reviewing the original datasheet. Add input filtering and protection only after checking the receiver’s specified voltage and timing limits.
Recommended
Communications Equipment
The MC3437L can be considered for receive-side digital signaling in older communications equipment where six bus lines must be converted into stable logic levels. Its input hysteresis helps reduce false transitions caused by coupling or ringing, while the CDIP package supports through-hole maintenance. The part should be used only when the original system’s voltage levels and timing match the MC3437 specification. The supplied sources do not provide modern protocol, isolation, or electromagnetic-compatibility ratings, so those system requirements need separate verification.
Recommended
Embedded Control Systems
The MC3437L can serve as a receive-only front end in a legacy embedded control system that presents several digital status or command lines to a controller. Its six-channel organization reduces the number of separate receiver packages, and hysteresis provides a degree of noise tolerance. Because the verified data does not specify supply voltage, input thresholds, propagation delay, or temperature range, the component should be selected only from a controlled bill of materials with an approved original datasheet. Verify signal direction and pin numbering before connecting it to a microcontroller or programmable logic device.
Recommended
Instrumentation and Test Equipment
The MC3437L may be used in legacy instrumentation or test equipment to receive multiple digital control or status lines from a remote bus. Input hysteresis can improve repeatability when the source is electrically noisy, and the 16-pin CDIP format is practical for repair-oriented instruments. Before using it in a new measurement platform, verify the receiver’s noise margin, timing, supply range, and environmental ratings against the original manufacturer documentation. Do not infer modern instrument suitability from the distributor category alone.
Recommended
Recommended Products Summary
Engineering reference data for MC3437L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC3437 |
|---|---|---|
| Device Function | Hex bus receiver with input hysteresis | Hex bus receiver family device; exact suffix specification not provided |
| Package | 16-pin CDIP | 16-pin CDIP package family; exact suffix package confirmation required |
| Brand | Motorola | Motorola |
Key Differentiators
- Receive-only hexadecimal architecture (vs SN75176BD)
- Input hysteresis for switching stability (vs MAX232D)
- Through-hole legacy integration (vs MAX232D)
Design Notes
Place the MC3437L close to the bus connector or the point where the received signals enter the board. Keep input traces short, route a continuous ground reference beneath or beside the interface, and avoid placing the receiver behind long unprotected stubs. Because the verified data does not specify input capacitance or thresholds, validate the physical layout with the original datasheet and the target bus’s edge rate.
Do not treat a six-channel transceiver as a substitute for the receive-only MC3437L. Channel count alone does not establish pin compatibility, logic polarity, supply voltage, or propagation timing. Confirm the complete 16-pin pinout, input thresholds, output levels, and enable or direction behavior from the manufacturer documentation before modifying an existing board.
The verified input-hysteresis feature can improve noise immunity, but it does not replace proper bus termination or filtering. Check the source voltage, rise and fall times, trace length, return path, and termination strategy against the original interface specification. Use scope measurements at the receiver pins when validating a legacy board, especially if the bus is long or shares power paths with switching circuitry.
Compliance Information
The supplied source data does not provide verified RoHS, REACH, lead-free, halogen-free, conflict-minerals, or other compliance declarations. MC3437L is an interface IC and is not presented as an automotive-qualified part in the supplied evidence.
