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74F138PC
onsemi
IC DECODER/DEMUX 1X3:8 16DIP
3613 Pcs New Original In Stock
Decoder/Demultiplexer 1 x 3:8 16-PDIP
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Minimum 1
5.0 / 5.0
- (286 Ratings)
74F138PC
Product Overview
7745842
DiGi Electronics Part Number
74F138PC-DGManufacturer
onsemi
74F138PC
Description
IC DECODER/DEMUX 1X3:8 16DIPInventory
3613 Pcs New Original In Stock
Decoder/Demultiplexer 1 x 3:8 16-PDIP
Quantity
Minimum 1
Minimum 1
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74F138PC Technical Specifications
Category
Logic, Signal Switches, Multiplexers, Decoders
Packaging
-
Series
74F
Product Status
Obsolete
Type
Decoder/Demultiplexer
Circuit
1 x 3:8
Independent Circuits
1
Current - Output High, Low
1mA, 20mA
Voltage Supply Source
Single Supply
Voltage - Supply
4.5V ~ 5.5V
Operating Temperature
0°C ~ 70°C
Mounting Type
Through Hole
Package / Case
16-DIP (0.300", 7.62mm)
Supplier Device Package
16-PDIP
Base Product Number
74F138
Datasheet & Documents
HTML Datasheet
74F138PC-DG
Environmental & Export Classification
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
74F138PC-NDR
74F138
Standard Package
25
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
항상 신뢰할 수 있는 품질과 세심한 사후 지원이 좋습니다.
December 02, 2025
디지 일렉트로닉스의 제품은 항상 신뢰할 만하고 추천할 만합니다.
December 02, 2025
物流配送速度快，包裝完整，避免了我擔心的延遲問題，非常棒的購物體驗。
December 02, 2025
Support staff are knowledgeable and genuinely care about customer needs.
December 02, 2025
Clear and honest pricing policies are truly appreciated and make the process smoother.
December 02, 2025
Excellent support team that is always ready to assist after purchase.
December 02, 2025
The sturdy packaging minimized waste while maximizing protection, aligning with eco-values.
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Frequently Asked Questions (FAQ)
Can the 74F138PC be used in a modern 5V TTL design, and what are the risks given its obsolete status?
Yes, the 74F138PC can still function reliably in 5V TTL logic designs since it operates within the 4.5V to 5.5V supply range and is compatible with standard TTL voltage levels. However, because the 74F138PC is marked as obsolete, the primary risk is long-term supply chain instability—designs may face production interruptions once current inventories (3,552 pcs) are depleted. For new designs, consider drop-in replacements like the SN74F138N, which offers the same functionality with potentially better availability. Always verify timing and drive capability compatibility, as newer alternatives may have slight differences in propagation delay despite pin-to-pin equivalence.
What are the key design-in considerations when replacing a 74HC138 with the 74F138PC in a demux circuit?
When substituting a 74HC138 with the 74F138PC, ensure the system uses a 5V supply—unlike the wide 2V–6V range of 74HC, the 74F138PC requires a strict 4.5V–5.5V single supply. More critically, the 74F series has faster propagation delays (~3ns typical) but higher power consumption and significant ground bounce risks due to abrupt current transitions. The 74F138PC is also TTL-input compatible, whereas 74HC expects CMOS-level inputs; if driving from 3.3V or low-current CMOS outputs, signal integrity may be compromised. Use series resistors or buffers if input thresholds are marginal. Also, verify fan-out limits—74F can drive up to 10 LSTTL loads but fewer CMOS loads due to dynamic power constraints.
How does the output drive strength of the 74F138PC compare to newer logic families, and what are the implications for signal integrity?
The 74F138PC provides 1mA drive high and 20mA drive low, which is sufficient for driving multiple LSTTL inputs but weaker than many modern high-drive logic devices. This asymmetry can lead to slow rising edges when driving capacitive loads above 50pF, increasing susceptibility to noise. In dense PCB layouts, fast falling edges may cause ground bounce due to high peak sink currents. To maintain signal integrity, limit capacitive loading, use series termination resistors (22–47Ω), and ensure low-inductance ground paths. For driving longer traces or higher fan-outs, buffer the outputs with a 74F07 or similar open-collector driver. Avoid direct interface with modern low-voltage receivers without level shifting.
Is the SN74F138N a reliable second-source substitute for the 74F138PC, and are there any design compatibility risks?
Yes, the SN74F138N from Texas Instruments is a reliable second-source replacement for the 74F138PC, offering identical functionality, pinout, and specifications (3:8 decoder/demultiplexer, 16-DIP, 4.5V–5.5V supply, 1mA/20mA drive). Both operate within 0°C to 70°C and support through-hole mounting. Design compatibility is high, but validate timing performance: TI’s SN74F138N may have slightly different propagation delays or enable timing margins. Always cross-check worst-case timing in your application, especially in cascaded demux configurations. Also, ensure PCB footprint tolerances accommodate minor package variations between manufacturers. For long-term reliability, TI's active production status offers better assurance than onsemi’s obsolete 74F138PC.
What are the thermal and reliability implications of using the 74F138PC in a high-cycle switching application?
The 74F138PC, based on F-type TTL logic, has higher dynamic power dissipation compared to CMOS equivalents, especially in high-frequency or continuously switching applications. Although the device has no specified maximum switching frequency, power increases linearly with toggle rate due to internal capacitance and current surges during transitions. In high-cycle use (e.g., >10MHz address decoding), localized heating can occur even within the 0°C to 70°C rating, potentially reducing long-term reliability. Mitigate risks by minimizing unused enable pin transitions, adding small bypass capacitors (0.1µF ceramic) at VCC, and ensuring adequate board-level airflow. Avoid operating at max ambient temperature with sustained high activity—consider lifetime derating to extend MTBF, particularly in industrial environments.
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.
74F138PC CAD Models
onsemi 74F138PC PCB symbols & footprints
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