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74AC139SCX
onsemi
IC DECODER/DEMUX 1X2:4 16SOIC
35100 Pcs New Original In Stock
Decoder/Demultiplexer 1 x 2:4 16-SOIC
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5.0 / 5.0
- (248 Ratings)
74AC139SCX
Product Overview
7745826
DiGi Electronics Part Number
74AC139SCX-DGManufacturer
onsemi
74AC139SCX
Description
IC DECODER/DEMUX 1X2:4 16SOICInventory
35100 Pcs New Original In Stock
Decoder/Demultiplexer 1 x 2:4 16-SOIC
Quantity
Minimum 1
Minimum 1
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74AC139SCX Technical Specifications
Category
Logic, Signal Switches, Multiplexers, Decoders
Packaging
Cut Tape (CT) & Digi-Reel®
Series
74AC
Product Status
Active
Type
Decoder/Demultiplexer
Circuit
1 x 2:4
Independent Circuits
2
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
74AC139
Datasheet & Documents
HTML Datasheet
74AC139SCX-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
74AC139SCXDKR
74AC139SCXTR
2832-74AC139SCXTR
74AC139SCX-DG
74AC139SCXCT
2156-74AC139SCX-488
Standard Package
2,500
Alternative Parts
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MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
December 02, 2025
포장 과정이 매우 깔끔하고 견고했으며, 배송 추적 덕분에 배송 시간 확인이 편리했습니다.
December 02, 2025
배송이 빠르고, 배송 과정 동안 어떤 문제도 발생하지 않아서 좋아요.
December 02, 2025
每次在Digi購物都很順利，產品都很優質，售後服務也非常到位，值得信賴。
December 02, 2025
Une gamme de produits fiables et à prix abordables qui me conviennent parfaitement.
December 02, 2025
Their price advantage is apparent and helps me save significantly compared to other stores.
December 02, 2025
DiGi Electronics consistently offers good deals that include high-quality, attractive packaging.
December 02, 2025
The delivery was swift, and the packaging quality was superb.
December 02, 2025
I appreciate their quick delivery and the promptness of their customer support.
December 02, 2025
Received my order swiftly, and the product quality is impeccable.
December 02, 2025
You get excellent value for money with DiGi Electronics' well-priced products and quality packaging.
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Frequently Asked Questions (FAQ)
What are the key design-in considerations when using the 74AC139SCX in a mixed-voltage logic system with 3.3V and 5V components?
When integrating the 74AC139SCX into a mixed-voltage system, verify that all input signals are within its 2V to 6V supply range. While the 74AC139SCX can operate at 3.3V or 5V, its CMOS inputs are not inherently 5V-tolerant when VCC is at 3.3V. If 5V signals drive any inputs under 3.3V operation, risk of input damage or latch-up exists. To safely interface with 5V logic, use level translators or ensure the input clamping diodes can handle overvoltage with current-limiting resistors. Always reference the input voltage specifications relative to VCC, not absolute values, and consider power sequencing to avoid floating or back-driven inputs during power-up.
How does the 74AC139SCX compare to the CD74AC139M in terms of reliability and package robustness for industrial applications?
The 74AC139SCX and CD74AC139M are functionally equivalent, both being 74AC-series 2-to-4 decoders in 16-SOIC packages. However, the 74AC139SCX from onsemi often features tighter process controls and superior moisture sensitivity level (MSL1 – unlimited floor life), making it more suitable for harsh industrial environments or reflow processes with prolonged exposure. The CD74AC139M (typically TI) is also reliable but verify moisture rating per batch. For long-term reliability in high-humidity or thermally cycling conditions, the onsemi 74AC139SCX's MSL1 and ROHS3/REACH compliance provide better assurance against delamination or solder joint failure.
Can the 74AC139SCX replace a 74HC139 in a high-speed design without signal integrity risks?
Replacing a 74HC139 with the 74AC139SCX can improve speed due to lower propagation delays and faster rise/fall times in the 74AC family, but it introduces signal integrity risks in legacy 74HC designs. The 74AC139SCX has higher output drive (24mA vs. ~4mA for HC), which may cause ground bounce or EMI in poorly decoupled circuits. Additionally, its faster edges may exacerbate reflections on unterminated traces. To mitigate risks when substituting, ensure proper power supply decoupling (0.1µF ceramic per VCC pin), minimize trace lengths, and verify signal integrity with oscilloscope probing in the final layout. Avoid using 74AC in noise-sensitive analog-heavy boards without filtering.
What thermal and current limitations should be considered when driving multiple loads with the 74AC139SCX outputs?
Although the 74AC139SCX specifies 24mA per output, the total package current and thermal dissipation limit practical drive capability. With two independent 2:4 decoders, avoid exceeding the SOIC-16 package’s maximum junction temperature (Tj) of 150°C. Continuous sourcing of >15mA per output or >70mA total package current without adequate PCB copper heatsinking may cause thermal shutdown or parametric drift. For driving LEDs or high-fanout TTL loads, derate output current to 12-16mA, use series resistors, and ensure supply traces are wide enough. Monitor VCC noise since simultaneous switching outputs can induce droop—use local bypassing at each VCC pin.
What are the key risks when replacing a MC74AC139DR2G with the 74AC139SCX in an existing design, and how can compatibility be confirmed?
The 74AC139SCX and MC74AC139DR2G (from ON Semiconductor and Motorola/Freescale respectively) are pin-to-pin and functionally compatible, both being 74AC139s in 16-SOIC packages. However, key risks include subtle differences in ESD protection, input threshold levels, and timing over temperature. Always confirm that the 74AC139SCX’s propagation delays and enable-to-output timing meet the system’s setup/hold margins. Review the PCB layout for potential parasitic loading due to package sourcing differences. Since both are MSL1 and ROHS3 compliant, no assembly process changes are needed, but validate post-replacement under worst-case conditions (e.g., -40°C, low VCC) to ensure reliable decode operation.
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.
74AC139SCX CAD Models
onsemi 74AC139SCX PCB symbols & footprints
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