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Home > Products > Integrated Circuits (ICs) > Logic > Gates and Inverters

onsemi MM74HCT32MTC

Name: MM74HCT32MTC
Brand: onsemi
SKU: MM74HCT32MTC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MM74HCT32MTC

Manufacturer:: onsemi

Category:: Gates and Inverters

Package:: 14-TSSOP (0.173", 4.40mm Width)

Datasheet:: MM74HCT32MTC.pdf

Description:: IC GATE OR 4CH 2-INP 14TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MM74HCT32MTC from onsemi is a quad 2-input OR gate logic IC fabricated in advanced silicon-gate CMOS technology, providing TTL/LS pinout and threshold compatibility, 10 ns typical propagation delay (tPLH/tPHL), and operation across 4.5 V to 5.5 V supply with –40 °C to +85 °C temperature range. It serves as a low-power, drop-in replacement for 74LS32 in digital control, interface buffering, and combinational logic circuits.

For engineers reviewing the MM74HCT32MTC datasheet, pinout, applications, or equivalent options, key selection considerations include its SOIC-14/TSSOP-14 package options, guaranteed 25 ns max propagation delay over full temperature range, LS-TTL load drive capability (10 loads), and RoHS-compliant Pb-free construction.

Technical Context

The MM74HCT32MTC implements four independent 2-input OR gates using CMOS circuitry with TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and rail-to-rail output swing. Its internal structure includes clamp diodes on all inputs for ESD protection to VCC and GND.

It operates as a level-shifting interface between TTL/NMOS and CMOS systems, supporting mixed-voltage logic design without external pull-ups or level translators. The device draws only 2.0 µA typical quiescent current at 25 °C and sustains ±25 mA DC output current per pin.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Function	Quad 2-input OR gate - provides four independent Boolean OR operations in one package
Supply Voltage Range	4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS systems; no external regulation needed
Propagation Delay	25 ns max (–40 °C to +85 °C) - ensures timing predictability in synchronous control logic
Output Drive	±25 mA per pin - directly drives 10 LS-TTL loads without buffer stages
Input Thresholds	VIH = 2.0 V min, VIL = 0.8 V max - enables reliable interfacing with legacy TTL outputs
Quiescent Current	20 µA max (–40 °C to +85 °C) - supports low-static-power system design
Operating Temperature	–40 °C to +85 °C - qualified for industrial-grade embedded control environments

Pinout & Package

TSSOP-14 WB package (Case 948G), 5.0 mm × 4.4 mm footprint, 0.65 mm pitch, thin-profile surface-mount construction suitable for high-density PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 4, 5, 8, 9, 12, 13	Input A/B of OR gates	Eight total inputs across four OR gates; each pair (e.g., pins 1&2 → pin 3 output) forms one gate
3, 6, 10, 11	OR Gate Outputs	Four independent logic-high/low outputs; fan-out capable of driving 10 LS-TTL loads
7	GND	Ground reference for all logic and power domains; must be low-impedance connection
14	VCC	Positive supply rail (4.5–5.5 V); decoupling capacitor required within 1 cm of this pin

Key Features

Feature	Design Value
TTL/LS pinout and threshold compatibility	Direct replacement for 74LS32 without board redesign or signal conditioning
Low quiescent power consumption	20 µA max ICC enables battery-backed or energy-sensitive control modules
ESD-protected inputs	Internal diodes clamp transients to VCC/GND - eliminates need for external TVS on inputs
High noise immunity	Input hysteresis not specified, but VIH/VIL margins (2.0 V / 0.8 V) provide >1.2 V noise margin at 5 V
Pb-free, Halide-free, RoHS-compliant	Meets IPC-J-STD-609A Class 1 moisture sensitivity; suitable for lead-free reflow (260 °C peak)

Applications

Industrial PLC I/O Expansion	Legacy System Logic Interface
Use Scenario: Adding discrete OR logic to consolidate multiple sensor fault signals into a single alarm line in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Combinational logic gate aggregating up to four independent binary inputs into one active-HIGH alarm output. Use Value: Eliminates need for discrete diode-OR networks or microcontroller GPIO polling - reduces BOM count and improves deterministic response time (<25 ns).	Use Scenario: Interfacing vintage 74LS-based instrumentation with modern CMOS microcontrollers operating at 5 V. IC Role / Device Role / Timing Role: Level-shifting and fan-out buffer ensuring TTL-compatible voltage thresholds and drive strength for bidirectional control lines. Use Value: Enables direct connection without pull-up resistors or level translators - preserves signal integrity and simplifies layout.
Power Sequencing Control	Digital Panel Indicator Logic
Use Scenario: Generating enable signals for downstream DC-DC converters based on multiple upstream power-good status flags. IC Role / Device Role / Timing Role: OR gate combining PG signals from three LDOs to assert a master "system ready" signal. Use Value: Provides fail-safe startup sequencing with sub-30 ns worst-case latency - critical for FPGA or ASIC power-on initialization.	Use Scenario: Driving LED indicators on front panels where multiple switch inputs (e.g., mode select, test, reset) should illuminate the same status LED. IC Role / Device Role / Timing Role: Wired-OR logic function enabling any of four user inputs to activate a common indicator output. Use Value: Reduces wiring complexity and replaces mechanical jumper configurations - improves field serviceability and reduces assembly errors.

Industrial PLC I/O Expansion

Legacy System Logic Interface

Use Scenario: Adding discrete OR logic to consolidate multiple sensor fault signals into a single alarm line in programmable logic controller backplanes.

IC Role / Device Role / Timing Role: Combinational logic gate aggregating up to four independent binary inputs into one active-HIGH alarm output.

Use Value: Eliminates need for discrete diode-OR networks or microcontroller GPIO polling - reduces BOM count and improves deterministic response time (<25 ns).

Use Scenario: Interfacing vintage 74LS-based instrumentation with modern CMOS microcontrollers operating at 5 V.

IC Role / Device Role / Timing Role: Level-shifting and fan-out buffer ensuring TTL-compatible voltage thresholds and drive strength for bidirectional control lines.

Use Value: Enables direct connection without pull-up resistors or level translators - preserves signal integrity and simplifies layout.

Power Sequencing Control

Digital Panel Indicator Logic

Use Scenario: Generating enable signals for downstream DC-DC converters based on multiple upstream power-good status flags.

IC Role / Device Role / Timing Role: OR gate combining PG signals from three LDOs to assert a master "system ready" signal.

Use Value: Provides fail-safe startup sequencing with sub-30 ns worst-case latency - critical for FPGA or ASIC power-on initialization.

Use Scenario: Driving LED indicators on front panels where multiple switch inputs (e.g., mode select, test, reset) should illuminate the same status LED.

IC Role / Device Role / Timing Role: Wired-OR logic function enabling any of four user inputs to activate a common indicator output.

Use Value: Reduces wiring complexity and replaces mechanical jumper configurations - improves field serviceability and reduces assembly errors.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2-input OR gate applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74HCT32DR	SOIC-14 only; identical AC/DC specs, same 25 ns max tPLH/tPHL, but marking and tape/reel packaging differ	No TSSOP option - unsuitable for space-constrained designs requiring MM74HCT32MTC's 5.0 × 4.4 mm footprint	Select SN74HCT32DR only when SOIC-14 is mandated by legacy layout or procurement policy
74VHC32M	Higher speed (7.5 ns typ), wider VCC range (2–5.5 V), but VIH/VIL thresholds differ (VIH = 3.5 V min at VCC = 5 V)	Not TTL-compatible - requires verified input source compliance with higher VIH; unsuitable for direct 74LS replacement	Choose 74VHC32M only in new designs where 2–5.5 V operation and faster timing outweigh TTL interoperability needs

Compared with SN74HCT32DR and 74VHC32M, the MM74HCT32MTC uniquely delivers TSSOP-14 packaging with guaranteed TTL/LS compatibility and industrial temperature support - making it optimal for retrofitting legacy systems while meeting modern density and compliance requirements.

Availability

MM74HCT32MTC is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy system logic interface, and power sequencing control requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for MM74HCT32MTC 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, logic, and sensing solutions for automotive, industrial, and cloud infrastructure markets.

The MM74HCT32MTC belongs to the HCT logic family designed specifically to bridge TTL and CMOS technologies - delivering pin-and-function compatibility with 74LS devices while reducing power consumption and improving noise immunity.

FAQ

What is the maximum propagation delay of the MM74HCT32MTC over its full operating temperature range?

The MM74HCT32MTC has a guaranteed maximum propagation delay of 25 ns for both tPLH and tPHL across the full –40 °C to +85 °C operating temperature range at VCC = 5.0 V ±10% and CL = 15 pF. This value is specified in the datasheet's AC Characteristics table and ensures predictable timing behavior in industrial control timing paths where jitter or delay variation must be bounded.

Is the MM74HCT32MTC pin-compatible with the 74LS32?

Yes, the MM74HCT32MTC is explicitly designed as a pinout-compatible and functionally equivalent replacement for the 74LS32. Its pin assignments match the standard 14-pin dual-in-line configuration: inputs and outputs align identically, and VCC (pin 14) and GND (pin 7) occupy the same positions. This allows direct substitution in existing 74LS32 layouts without PCB modification.

Does the MM74HCT32MTC support 3.3 V operation?

No, the MM74HCT32MTC is not rated for 3.3 V operation. Its recommended operating supply voltage is strictly 4.5 V to 5.5 V, and absolute maximum VCC is +6.5 V. Operation below 4.5 V may result in undefined logic thresholds, increased propagation delay, or failure to meet VIH/VIL specifications - use 74VHC32 or 74LVC32 for 3.3 V systems.

What package type does the MM74HCT32MTC use, and what are its key mechanical dimensions?

The MM74HCT32MTC uses the TSSOP-14 WB package (Case 948G), measuring 5.0 mm × 4.4 mm with 0.65 mm lead pitch. Its height is 1.20 mm max, and it features gull-wing leads optimized for automated SMT assembly. This thin, compact footprint supports high-density routing and thermal performance superior to SOIC-14 in constrained spaces.

How does the MM74HCT32MTC handle electrostatic discharge on its inputs?

The MM74HCT32MTC includes internal clamp diodes on all inputs connected to VCC and GND, providing ESD protection per ANSI/ESDA/JEDEC JS-001 (HBM). These diodes limit transient voltages to safe levels during handling or system-level ESD events, eliminating the need for external TVS diodes in most industrial environments - though external protection remains advisable for harsh I/O interfaces.

MM74HCT32MTC Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74HCT

Package/Case:: 14-TSSOP (0.173", 4.40mm Width)

Packaging:: Bulk

Product Status:: Obsolete

Logic Type:: OR Gate

Number of Circuits:: 4

Number of Inputs:: 2

Features:: -

Voltage - Supply:: 4.5V ~ 5.5V

Current - Quiescent (Max):: 2 µA

Current - Output High, Low:: 4.8mA, 4.8mA

Input Logic Level - Low:: 0.8V

Input Logic Level - High:: 2V

Max Propagation Delay @ V, Max CL:: 20ns @ 5V, 15pF

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-TSSOP

MM74HCT32MTC FAQ

1.How can I place an order for MM74HCT32MTC through Aetrix?

Please submit a Request for Quotation (RFQ) for MM74HCT32MTC 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 MM74HCT32MTC reliable?

The price and inventory of MM74HCT32MTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM74HCT32MTC is usually 5 days.

3.What payment methods are accepted for MM74HCT32MTC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM74HCT32MTC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MM74HCT32MTC?

MM74HCT32MTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MM74HCT32MTC 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 MM74HCT32MTC?

For technical support, including MM74HCT32MTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM74HCT32MTC requirements.

6.How does Aetrix verify that MM74HCT32MTC is sourced from the original manufacturer or authorized distributors?

All MM74HCT32MTC 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 MM74HCT32MTC meets industry standards.

7.What is the process for return or replacement of MM74HCT32MTC?

All MM74HCT32MTC units undergo pre-shipment inspection (PSI). If there is an issue with MM74HCT32MTC, 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 MM74HCT32MTC part is unused and in its original packaging.

Return procedure for MM74HCT32MTC:

1.Submit a request within 90 days.

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

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