CD74HCT259M96E4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
CD74HCT259M96E4 is an 8-bit addressable latch with 1-to-8 demultiplexer function from Texas Instruments in the HCT family, accepting TTL-level inputs at 5 V. It routes a single data input to one of 8 latched outputs selected by a 3-bit address, with 4 mA output drive in a 16-pin SOIC package. Available from stock worldwide for output port expansion and serial-to-parallel data distribution in 5 V TTL-compatible systems.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- CD74HCT259M96E4 Datasheet PDF
- Category
- Integrated Circuit
- 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 CD74HCT259M96E4?
- 1-to-8 demultiplexer followed by D-latch on each output, allowing a single serial data line to set any of 8 independent latched outputs via a 3-bit address
- HCT family TTL-compatible inputs accept 5 V logic signals from microcontrollers and CPUs without level-shifting, with 4 mA output drive at 50 pF load
- 16-pin SOIC SMT package with e4 RoHS halogen-free rating, combining demux and latch functions to reduce external chip count in I/O expansion designs
What is CD74HCT259M96E4 used for?
The CD74HCT259M96E4 is used in I/O port expansion circuits where a microcontroller with limited GPIO pins needs to drive 8 independent control or status outputs using only a 3-bit address bus plus one data line. It is also applied in LED matrix drivers and relay control panels where individual output state retention between updates is required, since each latch holds its last written value until overwritten. The HCT TTL-input compatibility makes it a direct replacement for older 74LS259 parts in legacy 5 V systems without requiring any circuit modification.
What are the specifications of CD74HCT259M96E4?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Additional Feature | 1:8 DMUX FOLLOWED BY LATCH |
| Family | HCT |
| JESD-30 Code | R-PDSO-G16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | D LATCH |
| Max I(ol) | 0.004A |
| Number of Bits | 4 |
| Number of Functions | 1 |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 0.08mA |
| Prop. Delay@Nom-Sup | 49ns |
| Propagation Delay (tpd) | 57ns |
| Qualification Status | Not Qualified |
| Schmitt Trigger | NO |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Trigger Type | LOW LEVEL |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Mexico |
Where can I find the CD74HCT259M96E4 datasheet?
CD74HCT259M96E4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for CD74HCT259M96E4?
Compatible alternatives and drop-in replacements for CD74HCT259M96E4:
D Latch, HCT Series, 4-Func, Low Level Triggered, 8-Bit, True Output, CMOS, PDSO16
D Latch, HCT Series, 4-Func, Low Level Triggered, 8-Bit, True Output, CMOS, PDSO16
Frequently Asked Questions
How does the CD74HCT259M96E4 combine demultiplexer and latch functions to reduce GPIO pin count?
The CD74HCT259M96E4 routes a single data input (D) to one of 8 output latches selected by a 3-bit address (A0, A1, A2). Only 4 signal lines—data plus 3 address bits—are needed to independently set all 8 outputs over time, versus 8 dedicated GPIO lines for direct control. Each latch retains its last written state, so the microcontroller only needs to update the output that has changed.
What output drive current does the CD74HCT259M96E4 provide, and what loads can it directly drive?
The CD74HCT259M96E4 delivers a maximum output low current (I_OL) of 4 mA per output at 5 V supply and 50 pF load. This is sufficient to directly drive standard CMOS and TTL logic inputs, small signal LEDs through a 470 Ω to 1 kΩ series resistor, or opto-coupler inputs with appropriate forward current. For higher current loads such as relay coils or larger LEDs, a transistor driver stage is recommended.
How does the HCT family's TTL-compatible input threshold of the CD74HCT259M96E4 benefit legacy 5 V system designs?
The HCT input threshold is typically 1.6 V (high) and 0.8 V (low), identical to TTL logic levels, allowing the CD74HCT259M96E4 to directly interface with 5 V TTL outputs from older microprocessors, PLDs, and 74LS-series logic without any pull-up resistors or level translators. This makes it a pin-compatible, drop-in upgrade for 74LS259 in legacy industrial boards where CMOS voltage thresholds would cause false switching.
Can the CD74HCT259M96E4 be used to replace a 74LS259 in an existing PCB design without circuit modification?
Yes, the CD74HCT259M96E4 is functionally and pin-compatible with the 74LS259, sharing the same 16-pin SOIC footprint, 5 V supply, TTL-level input thresholds, and 1-to-8 addressable latch logic. The HCT CMOS version consumes far less quiescent current—typically under 80 µA versus several milliamps for 74LS259—reducing system power dissipation and heat without any PCB or firmware changes.
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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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