SN74HC42NSRE4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The SN74HC42NSRE4 is a high-speed CMOS 4-line to 10-line BCD decimal decoder from Texas Instruments' HC/UH family, decoding 4-bit binary-coded-decimal inputs into 10 active-low outputs in a 16-pin SOIC package. It is RoHS and REACH compliant and suits address decoding, display driving, and digital signal routing in industrial and consumer logic systems.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- SN74HC42NSRE4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 4-line BCD to 10-line decimal decoder with active-low outputs for direct load driving
- HC/UH CMOS family with 50 pF load capacitance rating for reliable high-speed switching
- 16-pin SOIC-16 package compatible with standard SMT assembly and 1.27 mm pitch footprints
- JESD-609 e4 rating confirms Pb-free, RoHS-compliant construction
- Low output sink current (4 mA) allows direct LED segment or logic bus interfacing
- Wide supply voltage range typical of HC family for 3.3 V and 5 V mixed-logic designs
Applications
The SN74HC42NSRE4 is commonly used in address decoding for memory and peripheral selection in embedded controller boards, where converting a 4-bit BCD bus address to 10 individual chip-select lines simplifies system architecture. It also drives seven-segment display multiplexers and numeric keypads in industrial HMI panels and consumer appliances that require BCD-to-decimal conversion logic.
Specifications
| Pbfree Code | Yes |
| YTEOL | 0 |
| Family | HC/UH |
| Input Conditioning | STANDARD |
| JESD-30 Code | R-PDSO-G16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | DECIMAL DECODER/DRIVER |
| Max I(ol) | 0.004A |
| Number of Functions | 1 |
| Output Polarity | INVERTED |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP16,.3 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 50mA |
| Prop. Delay@Nom-Sup | 38ns |
| Propagation Delay (tpd) | 190ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN74HC42NSRE4:
Frequently Asked Questions
How many outputs does the SN74HC42NSRE4 decode from its 4-bit BCD input?
The SN74HC42NSRE4 decodes a 4-bit BCD input into 10 active-low outputs, covering decimal values 0 through 9. Inputs that represent invalid BCD codes (10–15) cause all 10 outputs to remain high, providing automatic invalid-code rejection useful in fault-tolerant digital systems.
What load capacitance is the SN74HC42NSRE4 rated for, and how does this affect signal integrity at higher speeds?
The device is characterized at a load capacitance of 50 pF, which aligns with typical PCB trace and logic gate loads in the HC/UH family. Exceeding this capacitance increases propagation delay and may reduce noise margin, so designers driving long traces or heavily loaded buses should buffer the outputs to maintain signal integrity above a few megahertz.
Is the SN74HC42NSRE4 reaching end of life, and what should procurement teams consider?
The SN74HC42NSRE4 carries a YTEOL value of 0, indicating it is at or near its end-of-life milestone. Procurement teams planning new designs should evaluate pin-compatible replacement devices such as the SN74HC42D or equivalent 16-pin SOIC BCD decoders that remain in active production with YTEOL ratings above 5 years.
Can the SN74HC42NSRE4 be used in both 3.3 V and 5 V logic systems?
The HC-family CMOS process supports a supply voltage range that spans 3.3 V through 5 V systems, making the SN74HC42NSRE4 compatible with mixed-voltage boards. Output drive levels track supply voltage, so ensure the downstream logic inputs accept the specific V_OH/V_OL levels produced at the chosen rail before mixing 3.3 V and 5 V signals.
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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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