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74AC157SCX
onsemi
IC MULTIPLEXER 4 X 2:1 16SOIC
5403 Pcs New Original In Stock
Multiplexer 4 x 2:1 16-SOIC
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*Quantity
Minimum 1
Minimum 1
5.0 / 5.0
- (180 Ratings)
74AC157SCX
Product Overview
7745820
DiGi Electronics Part Number
74AC157SCX-DGManufacturer
onsemi
74AC157SCX
Description
IC MULTIPLEXER 4 X 2:1 16SOICInventory
5403 Pcs New Original In Stock
Multiplexer 4 x 2:1 16-SOIC
Quantity
Minimum 1
Minimum 1
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365 - Day Quality Guarantee - Every part fully backed.
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74AC157SCX Technical Specifications
Category
Logic, Signal Switches, Multiplexers, Decoders
Packaging
-
Series
74AC
Product Status
Obsolete
Type
Multiplexer
Circuit
4 x 2:1
Independent Circuits
1
Current - Output High, Low
24mA, 24mA
Voltage Supply Source
Single Supply
Voltage - Supply
2V ~ 6V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-SOIC (0.154", 3.90mm Width)
Supplier Device Package
16-SOIC
Base Product Number
74AC157
Datasheet & Documents
HTML Datasheet
74AC157SCX-DG
Environmental & Export Classification
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Standard Package
2,500
Alternative Parts
View DetailsPART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
December 02, 2025
The delivery was faster than expected, which was a pleasant surprise.
December 02, 2025
Efficient logistics processes at DiGi Electronics lead to higher customer satisfaction.
December 02, 2025
I find their prices very fair, especially considering the quality of support they provide.
December 02, 2025
Every interaction with their logistics team was handled with efficiency and courtesy.
December 02, 2025
It's wonderful to see a company prioritizing eco-friendly packaging without raising costs.
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Frequently Asked Questions (FAQ)
Can the 74AC157SCX be used as a drop-in replacement for the CD74AC157M in a high-noise industrial system, and what design risks should I evaluate?
While the 74AC157SCX and CD74AC157M are functionally equivalent and both part of the 74AC series, direct drop-in replacement in high-noise environments requires care. The 74AC157SCX has identical logic functionality and pinout to the CD74AC157M, but differences in packaging and manufacturer-specific process variations may affect EMI susceptibility. To mitigate risk, verify timing margins, confirm PCB layout supports clean signal routing (e.g. minimized trace lengths, ground shielding), and test under worst-case noise conditions. Also ensure single-supply voltage (2V to 6V) operation fits your system, as the 74AC157SCX does not support dual supplies.
Is the 74AC157SCX reliable for long-term use in new designs given its obsolete status, and what are the supply chain risks?
The 74AC157SCX is marked as obsolete, meaning onsemi no longer manufactures it. While available stock (5300 pcs) may suffice for short production runs or legacy system repairs, long-term reliability in new designs is risky due to potential supply shortages. For new designs, consider actively supported alternatives like the MC74AC157DR2G or NLV74AC157DR2G, which offer similar specs with better availability and lifecycle support. If using 74AC157SCX, secure lifetime buys and qualify second sources to avoid production disruption.
How does the 74AC157SCX perform when switching between analog signals, and are there risks of distortion or leakage current at 5V supply?
The 74AC157SCX is designed as a digital multiplexer and is not optimized for analog signal routing. While it can pass small-swing analog signals in a pinch, using it in this way risks distortion due to non-linear on-resistance, signal-dependent propagation delay, and leakage currents (up to 1µA at 85°C). At a 5V supply, CMOS input leakage may affect high-impedance sources. For analog multiplexing, use purpose-built analog switches like the CD4052 or TS5A23157. If forced to use 74AC157SCX, keep signal amplitudes within 0.2V to VCC-0.2V and source impedance below 50Ω to reduce errors.
When replacing the 74AC157SCX with the 74AHC157D,118 in a low-power battery application, what are the power and speed trade-offs I should consider?
Replacing the 74AC157SCX with the 74AHC157D,118 in a battery-powered system involves key trade-offs. The 74AHC157D offers lower quiescent current (typically 4µA vs. up to 40µA for 74AC157SCX), improving battery life. However, AHC series has slower propagation delays (~9ns vs. ~5ns for AC at 5V), which may affect high-speed signal paths. Also, the 74AHC157D has tighter input voltage thresholds, making it more sensitive to noisy or slowly rising signals. For battery systems, the 74AHC157D,118 is generally preferable if speed is not critical and clean logic levels are ensured.
What PCB layout guidelines are critical when integrating the 74AC157SCX in a mixed-signal design to avoid crosstalk and signal integrity issues?
When integrating the 74AC157SCX in mixed-signal systems, crosstalk and signal integrity risks are heightened due to its 24mA drive strength and fast edge rates. Key layout practices include: (1) placing 0.1µF ceramic decoupling capacitors within 5mm of each VCC pin to suppress ground bounce, (2) avoiding routing high-speed digital traces under sensitive analog lines, (3) maintaining consistent impedance and minimizing stubs on select and data lines, and (4) using a solid ground plane with short return paths. Due to the 16-SOIC package's lead pitch (1.27mm), ensure adequate spacing to prevent solder bridging during reflow. These steps reduce EMI and ensure reliable operation under full-load switching conditions.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
74AC157SCX CAD Models
onsemi 74AC157SCX PCB symbols & footprints
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