onsemi MM74C907N

Overview

MM74C907N from Fairchild Semiconductor is a hex open-drain P-channel buffer IC used for level shifting and wired-logic functions in mixed-voltage digital systems; operates from 3V to 15V supply, delivers −1.05 mA to −8.0 mA output sink current (depending on V_CC and V_OUT), features 150 ns propagation delay at 5V, and supports −40°C to +85°C industrial temperature range.

For engineers reviewing the MM74C907N datasheet, pinout, applications, or equivalent options, key selection criteria include open-drain P-channel topology, guaranteed 1V noise margin, CMOS/TTL interface compatibility, wire-OR/wire-AND implementation capability, and PDIP-14 package suitability for through-hole prototyping and legacy industrial control boards.

Technical Context

The MM74C907N integrates six independent inverters driving P-channel MOSFETs with open-drain outputs, enabling active-low logic assertion and voltage-level translation between dissimilar logic families. Its input structure includes diode clamps to V_CC and ground for ESD protection, and it exhibits high noise immunity (0.45×V_CC, typical) across its full 3V–15V operating range.

Unlike N-channel variants (e.g., MM74C906), the MM74C907N sinks current when output is low and requires external pull-down resistors for wired-OR operation - making it suitable for active-low bus arbitration and CMOS-to-PMOS interfacing where V_CC + V_DD ≤ 18V.

Key Specifications

Pinout & Package

MM74C907N is housed in a 14-lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" wide, with 0.1" lead pitch and through-hole mounting. Pin 7 is GND; Pin 14 is V_CC; inputs are on pins 1, 3, 5, 9, 11, 13; corresponding open-drain P-channel outputs are on pins 2, 4, 6, 10, 12, 14 - note: output pin 14 shares V_CC connection and is not independently driven.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar open-drain P-channel buffer applications.

Compared with CD40107BE and 74HC4050D, the MM74C907N uniquely combines six P-channel open-drain outputs, 3V–15V operation, and industrial temperature rating - making it irreplaceable for legacy 12V bus arbitration and mixed-voltage PMOS interface tasks where pin count, voltage range, and topology are jointly constrained.

Availability

MM74C907N is available at Aetrix Electronics and suitable for industrial control panels, legacy system upgrades, and mixed-voltage sensor interface designs requiring stable component supply over extended production lifecycles.

Supply support for MM74C907N 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

Fairchild Semiconductor was a U.S.-based analog and discrete semiconductor manufacturer, acquired by ON Semiconductor in 2016; known for robust industrial-grade logic and power products.

The MM74C907N belongs to Fairchild's legacy 74C CMOS logic family, designed specifically for voltage-level translation, wired-logic synthesis, and interoperability between TTL, CMOS, and PMOS systems in harsh industrial environments.

FAQ

What is the function of the MM74C907N in a digital system?

The MM74C907N functions as a hex open-drain P-channel buffer that inverts input signals and drives external pull-down networks to implement wired-OR logic, level translation, and bus arbitration. Each of its six channels sinks current when active, allowing multiple MM74C907N outputs to share a common line without contention. Its design enables direct interfacing between 3V–15V logic domains while maintaining noise immunity and timing predictability - critical for MM74C907N deployment in industrial control hardware.

Can the MM74C907N be used as a direct replacement for the MM74C906N?

No, the MM74C907N cannot serve as a direct replacement for the MM74C906N because they implement opposite output topologies: MM74C907N uses P-channel open-drain outputs that sink current, whereas MM74C906N uses N-channel open-drain outputs that source current. Their logic polarities differ - MM74C907N inverts and pulls down, while MM74C906N inverts and pulls up. Substituting one for the other without adjusting external resistor networks and signal expectations will cause functional failure. The MM74C907N must be used with pull-down resistors; MM74C906N requires pull-up resistors.

What is the maximum allowable supply voltage for the MM74C907N?

The absolute maximum supply voltage for the MM74C907N is 18V, but the recommended operating range is 3V to 15V per its DC Electrical Characteristics table. Operation at 18V exceeds specification limits and risks parametric shift or long-term reliability degradation. For sustained use, V_CC should remain ≤15V - this ensures compliance with guaranteed noise margin, propagation delay, and output current specs. The MM74C907N datasheet explicitly defines 15V as the upper limit for normal operation, and all published performance data (e.g., −8.0 mA sink current, 75 ns delay) apply within the 3V–15V range.

Does the MM74C907N require external pull-up or pull-down resistors?

Yes, the MM74C907N requires external pull-down resistors on each open-drain P-channel output to establish a defined logic-high state when the output is inactive. Unlike push-pull buffers, it cannot actively drive high - only sink current to pull the line low. Pull-down values are selected based on bus capacitance, speed requirements, and load current; typical values range from 4.7 kΩ to 47 kΩ. Using pull-up resistors would prevent correct wired-OR operation and violate the MM74C907N's intended P-channel topology. This requirement is fundamental to how the MM74C907N implements level shifting and bus arbitration.

Is the MM74C907N suitable for automotive applications?

No, the MM74C907N is not qualified for automotive applications. Its specified operating temperature range is −40°C to +85°C, which meets industrial but not AEC-Q100 automotive grade requirements (which mandate −40°C to +125°C or higher). Additionally, Fairchild's datasheet includes no automotive qualification statements, stress test reports, or PPAP documentation for the MM74C907N. While it may function in benign under-hood environments, it lacks the screening, testing, and reliability validation required for safety-critical or mission-critical automotive systems. For such use cases, designers must select AEC-Q100-qualified alternatives - the MM74C907N remains appropriate for industrial, commercial, and legacy equipment only.