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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

onsemi MM74C902N

Name: MM74C902N
Brand: onsemi
SKU: MM74C902N
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MM74C902N

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 14-DIP (0.300", 7.62mm)

Datasheet:: MM74C902N.pdf

Description:: IC BUFFER NON-INVERT 15V 14DIP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MM74C902N from Fairchild Semiconductor is a hex non-inverting TTL buffer IC built with complementary MOS technology, operating across 3.0V–15V supply range, delivering 5.0 mA source / 9.0 mA sink drive at 5V, and featuring 54–90 ns propagation delay (logical 0) at 5V. It enables direct CMOS-to-TTL level translation in industrial control logic interfaces.

For engineers reviewing the MM74C902N datasheet, pinout, applications, or equivalent options, key selection criteria include its non-inverting logic function, 14-pin PDIP package, guaranteed 1.0 V noise margin, TTL fan-out of 2, and compatibility with both CMOS input sources and TTL loads at reduced V_CC.

Technical Context

The MM74C902N implements six independent non-inverting buffer stages using CMOS transistor pairs, supporting bidirectional voltage-level translation between CMOS and TTL families. Its input structure accepts TTL-logic thresholds (e.g., V_IN(0) ≤ 1.5 V at V_CC = 4.75 V) while driving standard TTL loads with V_OUT(0) ≤ 0.4 V at I_SINK = 3.2 mA.

It operates over −40°C to +85°C with absolute max V_CC = 18 V and input voltage tolerance up to V_CC + 0.3 V. Power dissipation is rated at 700 mW for the PDIP package, and input capacitance is 5.0 pF per channel.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Function	Hex non-inverting buffer - provides level-shifting signal amplification without polarity inversion
Supply Voltage Range	3.0 V to 15 V - supports mixed-voltage system interfacing and battery-powered operation
Propagation Delay (t_pd0)	54–90 ns at 5 V - defines maximum clock/data rate for synchronous logic staging
Output Sink Current	3.2 mA at V_OUT = 0.4 V - drives one standard TTL input under worst-case low-state loading
Noise Margin	Guaranteed 1.0 V - ensures robust operation in electrically noisy industrial environments
Input Capacitance	5.0 pF - minimizes capacitive loading on upstream CMOS drivers and preserves signal edge integrity
Operating Temperature	−40°C to +85°C - qualified for extended industrial temperature range applications

Pinout & Package

MM74C902N is housed in a 14-lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-011, 0.300" wide, with 0.100" lead pitch and through-hole mounting.

Pin/Terminal	Circuit Role	Design Meaning
1, 3, 4, 5, 6, 8	Input (A1–A6)	CMOS/TTL-compatible digital inputs accepting 0–V_CC logic levels
2, 3, 5, 6, 9, 12	Output (Y1–Y6)	Non-inverted buffered outputs capable of sinking 3.2 mA or sourcing 5.0 mA at 5 V
7	GND	Ground reference for all internal circuitry and I/O
14	V_CC	Positive supply rail, supports 3.0–15 V operation with 18 V absolute maximum rating

Key Features

Feature	Design Value
Wide V_CC range (3.0–15 V)	Enables interoperability across legacy 5 V, modern 3.3 V, and high-voltage industrial logic rails
TTL fan-out of 2	Drives two standard TTL inputs directly without external buffering or pull-up resistors
High noise immunity (0.45 × V_CC typ.)	Reduces susceptibility to EMI-induced glitches in motor-control or relay-driver PCBs
Low input current (±1.0 µA max)	Minimizes loading on high-impedance CMOS sources such as microcontroller GPIO or crystal oscillator outputs
CMOS-to-TTL interface capability	Allows direct connection from CMOS logic (e.g., 74C/74HC) to legacy TTL subsystems without level-shifters

Applications

Industrial PLC I/O Expansion	Legacy Microcontroller Bus Interface
Use Scenario: Interfacing 5 V CMOS microcontroller GPIO to 5 V TTL peripheral chips (e.g., 74LS series shift registers) in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Non-inverting level translator and current amplifier ensuring valid TTL logic thresholds and fan-out compliance. Use Value: Eliminates need for discrete resistor networks or additional buffer ICs, reducing BOM count and layout area.	Use Scenario: Driving multiple TTL address latches from a single CMOS microprocessor data bus in retro-computing or instrumentation systems. IC Role / Device Role / Timing Role: Hex buffer providing simultaneous signal conditioning and load isolation across six parallel data lines. Use Value: Maintains signal integrity under 3.2 mA per output load while preserving <90 ns timing margins for 1 MHz bus operation.
Automated Test Equipment (ATE) Signal Conditioning	Electromechanical Control Panel Interface
Use Scenario: Buffering TTL-compatible test pattern generators before distribution to DUT (device-under-test) stimulus channels. IC Role / Device Role / Timing Role: Signal repeater with deterministic propagation delay and noise margin for synchronized stimulus delivery. Use Value: Ensures sub-100 ns skew control across six parallel test signals, critical for timing-sensitive parametric testing.	Use Scenario: Isolating pushbutton or switch matrix inputs from a central CMOS controller in factory HMI panels with long cable runs. IC Role / Device Role / Timing Role: Input conditioner converting noisy mechanical contact closures into clean, debounced-compatible logic levels. Use Value: Leverages 1.0 V guaranteed noise margin to suppress contact bounce and EMI without external RC filtering.

Industrial PLC I/O Expansion

Legacy Microcontroller Bus Interface

Use Scenario: Interfacing 5 V CMOS microcontroller GPIO to 5 V TTL peripheral chips (e.g., 74LS series shift registers) in programmable logic controller backplanes.

IC Role / Device Role / Timing Role: Non-inverting level translator and current amplifier ensuring valid TTL logic thresholds and fan-out compliance.

Use Value: Eliminates need for discrete resistor networks or additional buffer ICs, reducing BOM count and layout area.

Use Scenario: Driving multiple TTL address latches from a single CMOS microprocessor data bus in retro-computing or instrumentation systems.

IC Role / Device Role / Timing Role: Hex buffer providing simultaneous signal conditioning and load isolation across six parallel data lines.

Use Value: Maintains signal integrity under 3.2 mA per output load while preserving <90 ns timing margins for 1 MHz bus operation.

Automated Test Equipment (ATE) Signal Conditioning

Electromechanical Control Panel Interface

Use Scenario: Buffering TTL-compatible test pattern generators before distribution to DUT (device-under-test) stimulus channels.

IC Role / Device Role / Timing Role: Signal repeater with deterministic propagation delay and noise margin for synchronized stimulus delivery.

Use Value: Ensures sub-100 ns skew control across six parallel test signals, critical for timing-sensitive parametric testing.

Use Scenario: Isolating pushbutton or switch matrix inputs from a central CMOS controller in factory HMI panels with long cable runs.

IC Role / Device Role / Timing Role: Input conditioner converting noisy mechanical contact closures into clean, debounced-compatible logic levels.

Use Value: Leverages 1.0 V guaranteed noise margin to suppress contact bounce and EMI without external RC filtering.

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex non-inverting buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LS240N	Bipolar TTL design; fixed 5 V supply only; higher power consumption (25 mA typical I_CC); 15 ns t_pd	Requires dedicated 5 V rail; unsuitable for multi-voltage or battery-operated systems	Select when ultra-low propagation delay is prioritized over supply flexibility and power efficiency
74HC126N	CMOS-based; 2–6 V supply range; 7.8 mA output drive; 15–25 ns t_pd; no guaranteed TTL input compatibility	Limited to 5 V or lower systems; requires external pull-ups for open-drain TTL interfacing	Select for high-speed, low-power 3.3 V designs where native TTL input thresholds are not required

Compared with SN74LS240N and 74HC126N, the MM74C902N uniquely supports 3–15 V operation, delivers guaranteed TTL input compatibility without external components, and maintains industrial temperature range qualification - making it optimal for mixed-rail legacy upgrades and ruggedized control hardware.

Availability

MM74C902N is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy microcontroller bus interface, and automated test equipment signal conditioning requiring stable component supply and long-term obsolescence management.

Supply support for MM74C902N 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 semiconductor company specializing in analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; known for robust industrial-grade logic and interface products.

The MM74C902N belongs to Fairchild's 74C CMOS logic family, designed specifically to bridge voltage and logic-level gaps between CMOS and TTL systems in industrial control, instrumentation, and retro-computing applications.

FAQ

What is the logic function of the MM74C902N?

The MM74C902N is a hex non-inverting buffer - it provides six independent, unmodified logic-level pass-through channels. Each input drives a corresponding output with identical logic state, enabling signal isolation, fan-out expansion, and CMOS-to-TTL level translation without polarity inversion. This behavior is confirmed in the device's logic diagram and DC electrical characteristics table.

Does the MM74C902N support 3.3 V operation?

Yes, the MM74C902N supports 3.0 V to 15 V supply operation, including 3.3 V. At V_CC = 3.3 V, its input thresholds meet TTL-compatible levels (V_IN(0) ≤ 0.8 V, V_IN(1) ≥ V_CC − 1.5 V ≈ 1.8 V), and output drive remains functional - though sink/source currents scale downward versus 5 V operation. Full specifications at 3.3 V are derived from interpolation of published 5 V and 10 V data points.

What is the maximum operating temperature for the MM74C902N?

The MM74C902N is rated for continuous operation from −40°C to +85°C ambient temperature. This industrial temperature range is explicitly stated in the "Operating Temperature Range (T_A)" section of the datasheet and applies to both PDIP (N14A) and SOIC (M14A) packages. Operation beyond +85°C risks parametric degradation and is not guaranteed.

Can the MM74C902N drive standard TTL loads directly?

Yes, the MM74C902N is specified to drive standard TTL loads directly: at V_CC = 4.75 V, it guarantees V_OUT(0) ≤ 0.4 V with I_SINK = 3.2 mA and V_OUT(1) ≥ 2.4 V with I_SOURCE = −800 µA. These values satisfy the input requirements of 74LS-series TTL devices, confirming true TTL compatibility without external components.

Is the MM74C902N pin-compatible with the MM74C901N?

Yes, the MM74C902N and MM74C901N share identical 14-pin PDIP (N14A) packaging and pinout - both feature six independent buffers with matching input/output assignments. The sole functional difference is logic polarity: MM74C901N is inverting, MM74C902N is non-inverting. No PCB redesign is needed when substituting between them for functional evaluation or polarity adjustment.

MM74C902N Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74C

Package/Case:: 14-DIP (0.300", 7.62mm)

Packaging:: Bulk

Product Status:: Obsolete

Logic Type:: Buffer, Non-Inverting

Number of Elements:: 6

Number of Bits per Element:: 1

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 5mA, 9mA

Voltage - Supply:: 3V ~ 15V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 14-MDIP

MM74C902N FAQ

1.How can I place an order for MM74C902N through Aetrix?

Please submit a Request for Quotation (RFQ) for MM74C902N on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MM74C902N reliable?

The price and inventory of MM74C902N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM74C902N is usually 5 days.

3.What payment methods are accepted for MM74C902N?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM74C902N transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MM74C902N?

MM74C902N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MM74C902N order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MM74C902N?

For technical support, including MM74C902N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM74C902N requirements.

6.How does Aetrix verify that MM74C902N is sourced from the original manufacturer or authorized distributors?

All MM74C902N products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MM74C902N meets industry standards.

7.What is the process for return or replacement of MM74C902N?

All MM74C902N units undergo pre-shipment inspection (PSI). If there is an issue with MM74C902N, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MM74C902N part is unused and in its original packaging.

Return procedure for MM74C902N:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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