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

STMicroelectronics M74HC368B1R

Name: M74HC368B1R
Brand: STMicroelectronics
SKU: M74HC368B1R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M74HC368B1R

Manufacturer:: STMicroelectronics

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 16-DIP (0.300", 7.62mm)

Datasheet:: M74HC368B1R.pdf

Description:: IC BUFFER INVERT 6V 16DIP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

M74HC368B1R from STMicroelectronics is a high-speed CMOS hex bus buffer with three-state non-inverting outputs, featuring six independent buffers split into two enable-controlled groups (G1 for four channels, G2 for two), 9 ns typical propagation delay at 6 V, ±6 mA output drive, and operation across 2–6 V supply range. It serves in bidirectional data bus interfacing for microcontroller peripheral expansion and memory address latching.

For engineers reviewing the M74HC368B1R datasheet, M74HC368B1R pinout, M74HC368B1R application, or M74HC368B1R equivalent, key selection criteria include dual-enable 3-state control logic, symmetrical output impedance, wide VCC tolerance, high noise immunity (28% VCC), and DIP-16 package compatibility with legacy 74-series layouts.

Technical Context

The M74HC368B1R implements six non-inverting buffer channels with independent 3-state control: pins 1 (G1) enables buffers 1Y–4Y, and pin 15 (G2) enables 5Y–6Y. All outputs enter high-impedance state when respective enable inputs are high.

Designed using silicon gate C2MOS technology, it delivers balanced tPLH/tPHL delays (≤22 ns max at 6 V, CL = 50 pF), supports input rise/fall times up to 1000 ns at 2 V, and integrates input protection diodes against ESD and transient overvoltage.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	2 V to 6 V - Enables direct interface with 3.3 V and 5 V logic systems without level shifters.
tPD (Typ.)	9 ns at VCC = 6 V - Supports >50 MHz bus toggle rates in low-latency data path applications.
IOL / IOH	±6 mA min - Drives standard TTL loads and multiple CMOS inputs while maintaining rail-to-rail VOH/VOL.
VNIH / VNIL	28% VCC min - Provides robust noise margin against ground bounce and crosstalk in dense PCB layouts.
ICC (Max)	4 µA at TA = 25°C - Enables ultra-low static power in battery-backed or always-on control logic.
Output Enable Time	9 ns typ. (tPZL/tPZH at 6 V) - Allows rapid bus arbitration and time-multiplexed peripheral access.
Input Capacitance	10 pF max - Minimizes loading on upstream drivers and preserves signal integrity at high frequencies.

Pinout & Package

Package: Plastic DIP-16 (0.300" width), JEDEC MS-001, body dimensions 20.0 × 8.5 × 3.3 mm.

Pin/Terminal	Circuit Role	Design Meaning
1, 15	G1, G2	Active-low 3-state enable inputs - G1 controls Y1–Y4; G2 controls Y5–Y6; both must be low for output assertion.
2,4,6,10,12,14	1A–6A	Non-inverting data inputs - Directly connected to upstream logic sources; 10 pF max input capacitance limits driver load.
3,5,7,9,11,13	1Y–6Y	Buffered non-inverting outputs - Drive downstream loads with ±6 mA capability; enter high-Z when G1/G2 = high.
8	GND	Logic ground reference - Shared return path for all I/O and supply currents; requires low-impedance PCB plane.
16	VCC	Positive supply rail - Must be decoupled locally with ≥100 nF ceramic capacitor to suppress switching noise.

Key Features

Feature	Design Value
Dual independent 3-state enables	Separate G1/G2 control allows selective activation of 4-channel and 2-channel bus segments without gating logic.
Symmetrical output drive	\|IOH\| = IOL = 6 mA min ensures matched rise/fall times and consistent timing margins across voltage rails.
Wide VCC tolerance	2–6 V operation supports mixed-voltage system design and brown-out resilience down to 2 V.
High noise immunity	VNIH/VNIL = 28% VCC min reduces false triggering from simultaneous switching noise in multi-buffer configurations.
ESD-protected inputs	Integrated diode clamps withstand ±2 kV HBM - eliminates need for external TVS in moderate-noise industrial environments.

Applications

Microcontroller Bus Expansion

Memory Address Latching

Use Scenario: Expanding GPIO count of an STM32F4 MCU to drive 16-bit parallel LCD and SD card interface simultaneously.

IC Role / Device Role / Timing Role: Hex buffer isolates MCU pins from capacitive bus loading and enables time-multiplexed access via G1/G2 toggling.

Use Value: Eliminates timing skew between display and storage control lines by ensuring matched tPLH/tPHL ≤22 ns and 9 ns typical delay.

Use Scenario: Latching 12-bit address lines from an 8051-based embedded controller to static RAM and EPROM chips.

IC Role / Device Role / Timing Role: Non-inverting buffer with 3-state outputs acts as address bus driver during write cycles and disconnects during read cycles.

Use Value: Prevents bus contention with 6 mA drive strength and <100 ns enable/disable times, supporting 12 MHz CPU clock timing.

Industrial I/O Module

Legacy System Interface Adapter

Use Scenario: Level-shifting and buffering digital sensor outputs (e.g., rotary encoder quadrature signals) in a PLC backplane.

IC Role / Device Role / Timing Role: Signal conditioner that translates 24 V sensed logic to 5 V CMOS-compatible levels via external resistive dividers and internal buffering.

Use Value: 28% VCC noise margin ensures reliable operation in electrically noisy factory environments with >1 kV EFT immunity.

Use Scenario: Interfacing a modern ARM-based controller to legacy ISA-bus peripherals requiring 74LS368-compatible timing and pinout.

IC Role / Device Role / Timing Role: Drop-in replacement for obsolete 74LS368 with identical pin mapping, truth table, and enable logic polarity.

Use Value: Maintains backward compatibility while reducing quiescent current from 15 mA (LS) to 4 µA (HC), cutting module standby power by >99.9%.

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex 3-state buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74HC368N	Same logic function, pinout, and AC specs; TI version has slightly higher ICC (8 µA max) and lower tPD (8 ns typ. at 6 V).	Identical DIP-16 footprint; validated for TI-reference designs with SN74HC series timing libraries.	Select when sourcing from TI-authorized channels or requiring TI-specific qualification documentation.
74VHC368N	Higher speed (tPD = 5.5 ns typ.), lower input capacitance (4 pF), but narrower VCC range (2–5.5 V) and no -55°C rating.	Better suited for high-frequency data acquisition front-ends where sub-10 ns delay is critical and 6 V operation is unnecessary.	Prefer for new designs targeting >100 MHz bus rates, provided supply stays ≤5.5 V and temperature stays ≥-40°C.

Compared with SN74HC368N and 74VHC368N, the M74HC368B1R offers extended -55°C operation, tighter ICC control (4 µA max), and full 6 V tolerance-making it optimal for aerospace, automotive under-hood, and industrial control applications demanding wide temperature and voltage margins.

Availability

M74HC368B1R is available at Aetrix Electronics and suitable for microcontroller bus expansion, memory address latching, industrial I/O modules, and legacy system interface adapters requiring stable component supply across extended temperature and voltage ranges.

Supply support for M74HC368B1R 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with vertical manufacturing capabilities.

The M74HC368B1R belongs to ST's high-speed HC logic family, engineered for pin- and function-compatible upgrades of legacy 74LS devices in industrial control, instrumentation, and embedded computing systems.

FAQ

Is M74HC368B1R compatible with 5 V TTL logic inputs?

Yes. With VIH = 3.15 V min and VIL = 1.35 V max at VCC = 4.5 V, the M74HC368B1R accepts standard 5 V TTL input thresholds. Its input structure tolerates voltages up to VCC + 0.5 V, enabling safe interfacing with 5 V TTL outputs even when VCC = 5 V.

What is the maximum capacitive load this device can drive reliably?

The M74HC368B1R is characterized for CL = 50 pF and 150 pF in AC testing. At 6 V, it maintains tPLH/tPHL ≤22 ns with 50 pF and ≤27 ns with 150 pF. For reliable operation beyond 150 pF, add series termination or reduce edge rate using input RC filtering to avoid overshoot and ringing.

Can G1 and G2 be tied together for single-enable operation?

Yes. Connecting pins 1 and 15 to a common enable signal configures all six buffers as a unified 3-state group. This preserves full functionality and timing specs, simplifying control logic in applications requiring simultaneous bus enable/disable without channel segmentation.

Does this part support hot-swap or live-insertion?

No. The M74HC368B1R lacks powered-off protection or Ioff specification. Applying input signals while VCC = 0 V may forward-bias internal protection diodes, causing excessive current flow. Always power VCC before asserting inputs in hot-swap scenarios.

M74HC368B1R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74HC

Package/Case:: 16-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Logic Type:: Buffer, Inverting

Number of Elements:: 2

Number of Bits per Element:: 2, 4 (Hex)

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 7.8mA, 7.8mA

Voltage - Supply:: 2V ~ 6V

Operating Temperature:: -55°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 16-DIP

M74HC368B1R FAQ

1.How can I place an order for M74HC368B1R through Aetrix?

Please submit a Request for Quotation (RFQ) for M74HC368B1R 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 M74HC368B1R reliable?

The price and inventory of M74HC368B1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC368B1R is usually 5 days.

3.What payment methods are accepted for M74HC368B1R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC368B1R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M74HC368B1R?

M74HC368B1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M74HC368B1R 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 M74HC368B1R?

For technical support, including M74HC368B1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC368B1R requirements.

6.How does Aetrix verify that M74HC368B1R is sourced from the original manufacturer or authorized distributors?

All M74HC368B1R 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 M74HC368B1R meets industry standards.

7.What is the process for return or replacement of M74HC368B1R?

All M74HC368B1R units undergo pre-shipment inspection (PSI). If there is an issue with M74HC368B1R, 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 M74HC368B1R part is unused and in its original packaging.

Return procedure for M74HC368B1R:

1.Submit a request within 90 days.

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

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