CD74HC640E Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock

Name: CD74HC640E
Brand: Texas Instruments
SKU: CD74HC640E
Availability: InStock

The CD74HC640E is a high-speed CMOS octal inverting bidirectional bus transceiver from Texas Instruments with 3-state outputs, direction control, and a 20-pin DIP package. It operates from 2 V to 6 V and drives loads up to 50 pF at typical propagation delays under 10 ns. Available from stock with worldwide shipping.

ACTIVEIntegrated CircuitVerified Jun 2026

Package / Visual Reference

CD74HC640EDual-In-Line Packages

Quick Facts

Manufacturer: Texas Instruments
Package: Dual-In-Line Packages
Pin Count: 20
Lifecycle: ACTIVE
Datasheet: CD74HC640E Datasheet PDF
Category: Integrated Circuit
Price: From $1.8750(MOQ 1)
Temp Range: -55.0°C to 125.0°C
RoHS: Compliant
Lead Time: 3–7 business days
Shipping: DHL Express · Worldwide

What are the key features of CD74HC640E?

8 inverting bidirectional channels with common direction control enabling full-duplex 8-bit data-bus isolation in a single IC
3-state outputs with 50 pF drive capability and sub-10 ns propagation delay for high-speed CMOS bus interfaces
2 V to 6 V supply range in a 20-pin DIP package supporting legacy-compatible breadboard and through-hole prototyping

What is CD74HC640E used for?

The CD74HC640E is used in 8-bit microprocessor bus buffers, memory interface boards, and backplane data-bus drivers where bidirectional signal flow and 3-state isolation are needed. Its CMOS HC family compatibility allows direct interfacing with 3.3 V to 5 V logic systems without level translators. The through-hole 20-pin DIP package makes it a popular choice for educational prototyping platforms and industrial control boards with socketed logic ICs.

What are the specifications of CD74HC640E?

Pbfree Code	Yes
YTEOL	15
Additional Feature	WITH DIRECTION CONTROL
Control Type	COMMON CONTROL
Count Direction	BIDIRECTIONAL
Family	HC/UH
JESD-30 Code	R-PDIP-T20
JESD-609 Code	e4
Load Capacitance (CL)	50pF
Logic IC Type	BUS TRANSCEIVER
Max I(ol)	0.0078A
Number of Bits	8
Number of Functions	8
Number of Ports	2
Output Characteristics	3-STATE
Output Polarity	INVERTED
Package Body Material	PLASTIC/EPOXY
Package Equivalence Code	DIP20,.3
Package Shape	RECTANGULAR
Package Style	IN-LINE
Packing Method	TUBE
Power Supply Current-Max (ICC)	0.16mA
Prop. Delay@Nom-Sup	20ns
Propagation Delay (tpd)	135ns
Qualification Status	Not Qualified
Schmitt Trigger	NO
Supply Voltage-Max (Vsup)	6V
Supply Voltage-Min (Vsup)	2V
Supply Voltage-Nom (Vsup)	6V
Surface Mount	NO
Technology	CMOS
Temperature Grade	MILITARY
Terminal Finish	Nickel/Palladium/Gold (Ni/Pd/Au)
Terminal Form	THROUGH-HOLE
Terminal Pitch	2.54mm
Terminal Position	DUAL
Package	Dual-In-Line Packages

Compliance & Regulatory

RoHS Status	Compliant
Lead-Free	Yes (Pb-Free)
ECCN	EAR99
HTS Code	8542.39.00.90
Country of Origin	Malaysia

Where can I find the CD74HC640E datasheet?

CD74HC640E Datasheet Download

Official datasheet from Texas Instruments

What are equivalent replacements for CD74HC640E?

Compatible alternatives and drop-in replacements for CD74HC640E:

CD74HC640EE4Texas Instruments

Bus Transceiver, HC/UH Series, 1-Func, 8-Bit, Inverted Output, CMOS, PDIP20

View Part →

Compare all alternatives & request quotes →

Frequently Asked Questions

How many bidirectional channels does CD74HC640E provide and how is data direction controlled?

The CD74HC640E provides 8 inverting bidirectional channels controlled by a single direction pin (DIR) and an output-enable pin (OE). Setting DIR low passes data from bus B to bus A, while DIR high reverses the flow, allowing full 8-bit bidirectional transfers at propagation delays typically under 10 ns.

What supply voltage range does CD74HC640E support and is it compatible with 3.3 V logic systems?

The CD74HC640E operates from 2 V to 6 V, making it compatible with both 3.3 V and 5 V logic systems. However, because it is an HC-family device, mixing 3.3 V and 5 V domains may require checking datasheet VOH/VIH thresholds or using an HCT variant for guaranteed 5 V TTL-input compatibility.

When would CD74HC640E be preferred over a non-inverting bus transceiver such as 74HC245 in a system design?

CD74HC640E inverts data on each channel, making it suitable when the downstream bus logic requires inverted polarity, such as in active-low memory read/write schemes or when cascading two inverting transceivers to restore polarity across a long bus segment exceeding 50 pF capacitive load.

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About Texas Instruments

Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.

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AvailabilityIn Stock

Reference Price (USD)

From $1.8750

Buy from 1pc · Factory-direct pricing

Qty.	Unit Price	Ext. Price
1+	$3.7500	$3.75
4+	$2.5000	$10.00
11+	$1.8750	$20.63

pcs

Unit price: $3.7500 · Total: $3.75

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Lead Time3-7 business days

MOQFrom 1 piece

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OriginChina (Authorized)

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CD74HC640E Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock

What are the key features of CD74HC640E?

What is CD74HC640E used for?

What are the specifications of CD74HC640E?

Compliance & Regulatory

Where can I find the CD74HC640E datasheet?

What are equivalent replacements for CD74HC640E?

Frequently Asked Questions

How many bidirectional channels does CD74HC640E provide and how is data direction controlled?

What supply voltage range does CD74HC640E support and is it compatible with 3.3 V logic systems?

When would CD74HC640E be preferred over a non-inverting bus transceiver such as 74HC245 in a system design?

Related Guides

CSD87313DMS Synchronous Buck Power Stage Design Guide

STEF05SGR eFuse Selection Guide for 5 V Overcurrent Protection

C0402C103K3RACTU Selection Guide: Choosing a 10 nF 0402 MLCC

STM32H753VIT6 MCU Selection Guide: Memory, Package, Connectivity, and Security

Why Buy from FindMyChip

About Texas Instruments

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