Bipolar transistors

Diodes

ESD protection, TVS, filtering and signal conditioning

MOSFETs

SiC MOSFETs

GaN FETs

IGBTs

Analog & Logic ICs

Automotive qualified products (AEC-Q100/Q101)

74HCS251

Applications

Nexperia's demultiplexers are available in multiple logic families with 1, 2, 3 and 4 input lines and 2, 4, 8 and 16 output lines reducing the bit width of interface busses. They can be used as decoders by activating one of several mutually-exclusive output lines, based on the digital code present at the binary-weighted inputs. A typical use of decoders is in memory addressing in automotive applications such as display clusters, global positioning systems and keyless entry systems; allowing several memory devices to share a common data bus by ensuring that only one memory device is enabled at a time.

Digital decoders / demultiplexers are available in standard SO, TSSOP and leadless DQFN packages for PCB space saving. Nexperia's digital decoders / demultiplexers are fully specified from -40 °C to 125 °C.

Features and benefits

  • Multiple input enable for easy expansion or independent controls
  • Integrated input latch to store the address of decoder lines
  • Ideal for memory chip select decoding
  • Asynchronous and synchronous load options
  • Overvoltage tolerant input options
  • Inverting and non-inverting output options
  • 3-stage outputs
  • High frequency
  • Can be cascaded

Applications

  • Selection of memory banks and peripherals
  • I/O expansion

Parametrics

Type number VCC (V) Logic switching levels Power dissipation considerations Tamb (°C) Package name
74HCS251BQ 2.0 - 6.0 CMOS low -40~125 DHVQFN16
74HCS251D 2.0 - 6.0 CMOS low -40~125 SO16
74HCS251PW 2.0 - 6.0 CMOS low -40~125 TSSOP16

Package

Type number Orderable part number, (Ordering code (12NC)) Status Marking Package Package information Reflow-/Wave soldering Packing
74HCS251BQ 74HCS251BQX
(935692422115)		 Active S251 SOT763-1
DHVQFN16
(SOT763-1) 		SOT763-1 SOT763-1_115
74HCS251D 74HCS251DJ
(935692424118)		 Active 74HCS251D SOT109-1
SO16
(SOT109-1) 		SOT109-1 SO-SOJ-REFLOW
SO-SOJ-WAVE
WAVE_BG-BD-1
SOT109-1_118
74HCS251PW 74HCS251PWJ
(935692420118)		 Active S251 SOT403-1
TSSOP16
(SOT403-1) 		SOT403-1 SSOP-TSSOP-VSO-WAVE
SOT403-1_118

Environmental information

Type number Orderable part number Chemical content RoHS RHF-indicator
74HCS251BQ 74HCS251BQX 74HCS251BQ rohs rhf rhf
74HCS251D 74HCS251DJ 74HCS251D rohs rhf rhf
74HCS251PW 74HCS251PWJ 74HCS251PW rohs rhf rhf
Quality and reliability disclaimer

Documentation (16)

File name Title Type Date
AN90063 Questions about package outline drawings Application note 2025-10-22
SOT763-1 3D model for products with SOT763-1 package Design support 2019-10-03
SOT109-1 3D model for products with SOT109-1 package Design support 2020-01-22
SOT403-1 3D model for products with SOT403-1 package Design support 2020-01-22
74hcs251 74HCS251 IBIS model IBIS model 2025-10-30
Nexperia_package_poster Nexperia package poster Leaflet 2020-05-15
DHVQFN16_SOT763-1_mk plastic, dual in-line compatible thermal enhanced very thin quad flat package; 16 terminals; 0.5 mm pitch; 3.5 mm x 2.5 mm x 0.85 mm body Marcom graphics 2017-01-28
SO16_SOT109-1_mk plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.35 mm body Marcom graphics 2017-01-28
TSSOP16_SOT403-1_mk plastic, thin shrink small outline package; 16 leads; 0.65 mm pitch; 5 mm x 4.4 mm x 1.1 mm body Marcom graphics 2017-01-28
SOT763-1 plastic, leadless dual in-line compatible thermal enhanced very thin quad flat package; 16 terminals; 0.5 mm pitch; 3.5 mm x 2.5 mm x 1 mm body Package information 2023-05-11
SOT109-1 plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.75 mm body Package information 2023-11-07
SOT403-1 plastic, thin shrink small outline package; 16 leads; 5 mm x 4.4 mm x 1.2 mm body Package information 2023-11-08
SO-SOJ-REFLOW Footprint for reflow soldering Reflow soldering 2009-10-08
SO-SOJ-WAVE Footprint for wave soldering Wave soldering 2009-10-08
WAVE_BG-BD-1 Wave soldering profile Wave soldering 2021-09-08
SSOP-TSSOP-VSO-WAVE Footprint for wave soldering Wave soldering 2009-10-08

Support

If you are in need of design/technical support, let us know and fill in the answer form we'll get back to you shortly.

Models

File name Title Type Date
SOT763-1 3D model for products with SOT763-1 package Design support 2019-10-03
SOT109-1 3D model for products with SOT109-1 package Design support 2020-01-22
SOT403-1 3D model for products with SOT403-1 package Design support 2020-01-22
74hcs251 74HCS251 IBIS model IBIS model 2025-10-30

Ordering, pricing & availability

Sample

As a Nexperia customer you can order samples via our sales organization.

If you do not have a direct account with Nexperia our network of global and regional distributors is available and equipped to support you with Nexperia samples. Check out the list of official distributors.