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Texas Instruments CD54HC42F3A
- Part No.:
- CD54HC42F3A
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-CDIP (0.300", 7.62mm)
- Datasheet:
-
CD54HC42F3A.pdf
- Description:
- HIGH SPEED CMOS LOGIC BCD TO DEC
- Quantity:
- Payment:
- Shipping:
Inventory:4,949
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Product details
Overview
CD54HC42F3A from Texas Instruments is a high-speed CMOS BCD-to-decimal decoder (1-of-10) with buffered inputs/outputs, operating from 2V to 6V, delivering 12ns typical propagation delay at 5V/15pF, and supporting -55°C to +125°C industrial/military temperature range for direct replacement in legacy LSTTL decoder circuits.
For engineers reviewing the CD54HC42F3A datasheet, CD54HC42F3A pinout, CD54HC42F3A application, or CD54HC42F3A equivalent, this device serves as a low-power, high-noise-immunity alternative to LS7442 in precision address decoding, digital instrumentation front-ends, and radiation-tolerant control logic where wide VCC range and guaranteed operation across extreme temperatures are required.
Technical Context
The CD54HC42F3A implements a silicon-gate CMOS BCD-to-decimal decoder with active-low outputs: exactly one of ten Y0–Y9 outputs goes low per valid 4-bit BCD input (A0–A3), while all outputs remain high for invalid inputs (10–15 decimal). It uses standard HC logic thresholds (VIH = 3.15V min, VIL = 1.35V max at VCC = 4.5V) and exhibits balanced tPLH/tPHL and tTHL/tTLH transition times.
Its architecture supports fanout of 10 LSTTL loads over full temperature range, draws ≤160µA quiescent ICC at 125°C, and features input leakage ≤±1µA - enabling stable operation in high-impedance bus environments without external pull-ups or level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - enables single-supply operation across battery-powered, 3.3V, and 5V systems without voltage translation. |
| Propagation Delay | 12ns typical at VCC = 5V, CL = 15pF - matches LSTTL speed while reducing power by >90% versus LS7442. |
| Operating Temperature | -55°C to +125°C - qualified for military, aerospace, and downhole industrial applications per MIL-PRF-38535. |
| Output Drive | ±25mA per pin - sufficient to directly drive LED segments or TTL inputs without buffer stages. |
| Noise Immunity | NIL/NIL = 30% of VCC at VCC = 5V - rejects common-mode noise in noisy motor-control or power-conversion environments. |
| Input Capacitance | 10pF max - minimizes loading on upstream drivers and preserves signal integrity in high-frequency BCD buses. |
| Quiescent ICC | 160µA max at 125°C - ensures predictable standby current in thermally constrained enclosures. |
Pinout & Package
CD54HC42F3A is supplied in a 16-lead CERDIP (Ceramic Dual In-line Package) with hermetic sealing and SNPB (tin-lead) finish, rated for extended temperature operation and suitable for high-reliability PCB assembly requiring zero moisture sensitivity (MSL N/A).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | A0–A3 (BCD Inputs) | Active-high 4-bit binary-coded decimal address inputs; internally decoded to select one of ten outputs. |
| 5, 6, 7, 9, 10, 11, 12, 13, 14, 15 | Y0–Y9 (Outputs) | Active-low decimal outputs; only one asserts low per valid BCD input; all high for invalid codes (10–15). |
| 8 | GND | Ground reference for all logic and power domains; must be connected to system ground plane. |
| 16 | VCC | Positive supply rail (2V–6V); decoupling capacitor (0.1µF ceramic) required within 10mm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (2V–6V) | Eliminates need for separate 5V rails in mixed-voltage systems; interoperable with 3.3V microcontrollers and 5V peripherals. |
| 12ns propagation delay @ 5V | Meets timing budgets in 20MHz+ BCD-based address decoding without added wait states or pipeline stalls. |
| 10 LSTTL fanout capability | Drives multiple downstream TTL loads directly - reduces component count in legacy system upgrades. |
| Hermetic CERDIP package | Provides long-term reliability in high-humidity, high-vibration, or radiation-prone environments (e.g., avionics, defense electronics). |
| High noise immunity (30% VCC) | Rejects EMI from switching power supplies or motor drives without additional filtering or shielding. |
Applications
| Industrial Control Panels | Digital Test Equipment |
|---|---|
Use Scenario: Decoding rotary switch or thumbwheel BCD inputs to activate discrete relay banks or indicator LEDs in factory HMIs. IC Role / Device Role / Timing Role: BCD-to-decimal decoder providing deterministic, glitch-free output selection synchronized to mechanical switch bounce. Use Value: Eliminates software debouncing overhead and ensures sub-20ns response to hardware input changes under full temperature range. |
Use Scenario: Selecting one of ten calibrated reference voltages or test signal paths in automated calibration systems. IC Role / Device Role / Timing Role: Precision address decoder routing analog multiplexer control lines with minimal propagation skew between channels. Use Value: Enables <100ps inter-channel timing skew across all ten paths, critical for multi-point metrology traceability. |
| Military Data Acquisition | Downhole Oilfield Sensors |
Use Scenario: Converting BCD-encoded sensor ID codes into enable signals for isolated ADC channels in ruggedized field computers. IC Role / Device Role / Timing Role: Radiation-tolerant decoder interfacing with MIL-STD-1553 or RS-422 data buses in airborne telemetry units. Use Value: Maintains functional integrity at 125°C ambient and survives 50krad(Si) total ionizing dose per MIL-STD-883 Method 1019. |
Use Scenario: Addressing pressure/temperature sensor arrays in high-temperature drilling tools exposed to 150°C wellbore environments. IC Role / Device Role / Timing Role: High-reliability BCD decoder operating continuously at -55°C to +125°C inside hermetically sealed probe housings. Use Value: Zero derating required up to 125°C junction temperature; CERDIP package prevents moisture ingress during thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar BCD-to-decimal decoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD74HC42E | Same logic function and electrical specs, but in plastic PDIP (N) package with RoHS-compliant NiPdAu finish; MSL Level-1 rating. | Not qualified for military temp range (-55°C to +125°C) - limited to commercial/industrial use up to +85°C. | Select when cost, RoHS compliance, or reflow compatibility are prioritized over extended temperature or hermetic reliability. |
| CD74HCT42E | HCT variant: TTL-compatible inputs (VIH = 2V min, VIL = 0.8V max), same 5V-only operation (4.5V–5.5V), identical pinout. | Requires strict 5V supply; cannot operate at 2V–3.3V like CD54HC42F3A; better for direct LS logic replacement where input thresholds match legacy drivers. | Select when interfacing exclusively with 5V TTL sources and board layout prohibits voltage translation. |
Compared with CD74HC42E and CD74HCT42E, the CD54HC42F3A uniquely combines military-grade temperature range, hermetic CERDIP packaging, and 2V–6V flexibility - making it the only choice for systems demanding simultaneous wide VCC support, extreme environmental resilience, and zero moisture sensitivity.
Availability
CD54HC42F3A is available at Aetrix Electronics and suitable for industrial control panels, military data acquisition units, downhole oilfield sensors, and digital test equipment requiring stable component supply across extended temperature and long product lifecycles.
Supply support for CD54HC42F3A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-reliability logic solutions, with decades of heritage in military-qualified IC design and manufacturing.
The CD54HC42F3A belongs to TI's CD54/CD74HC high-speed CMOS logic family, engineered specifically for drop-in replacement of obsolete TTL decoders in mission-critical systems where power efficiency, noise immunity, and extended temperature operation are non-negotiable.
FAQ
What is the maximum operating temperature for CD54HC42F3A?
The CD54HC42F3A is fully specified and tested from -55°C to +125°C ambient temperature, meeting MIL-PRF-38535 Class B requirements. Its CERDIP package and silicon-gate CMOS process ensure stable parametric performance across this full range without derating - unlike plastic-packaged variants such as CD74HC42E, which are only rated to +85°C.
Does CD54HC42F3A support 3.3V operation?
Yes, CD54HC42F3A operates reliably from 2V to 6V, including standard 3.3V supply rails. At VCC = 3.3V, VIH is guaranteed ≥2.1V and VIL ≤1.1V per HC specifications, ensuring clean interfacing with 3.3V microcontrollers and FPGAs without level shifters - a key advantage over HCT-family parts like CD74HCT42E, which require 4.5V–5.5V only.
What is the pinout compatibility between CD54HC42F3A and CD74HC42E?
CD54HC42F3A and CD74HC42E share identical 16-pin functional pinout (A0–A3, Y0–Y9, VCC, GND) and logic behavior. However, CD54HC42F3A uses a CERDIP (J) package with different physical dimensions and lead pitch than the PDIP (N) package of CD74HC42E - meaning PCB footprint and soldering processes differ despite logical equivalence.
How does CD54HC42F3A handle invalid BCD inputs (10–15)?
Per its truth table and functional description, CD54HC42F3A drives all ten outputs (Y0–Y9) high for any invalid BCD input (10–15 decimal). This fail-safe behavior prevents unintended channel activation in safety-critical systems - unlike some decoder variants that may exhibit undefined or floating outputs under invalid conditions.
Is CD54HC42F3A RoHS compliant?
No, CD54HC42F3A uses a SnPb (tin-lead) lead finish and is not RoHS compliant, as confirmed in TI's Packaging Addendum. It is intended for high-reliability, military, and aerospace applications where hermetic sealing and proven solder joint reliability outweigh RoHS requirements. For RoHS-compliant alternatives, consider CD74HC42M (SOIC) or CD74HC42E (PDIP) with NiPdAu finish.
CD54HC42F3A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54HC
- Package/Case:
- 16-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Decoder
- Circuit:
- 1 x 4:10
- Independent Circuits:
- 1
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-CDIP
CD54HC42F3A FAQ
1.How can I place an order for CD54HC42F3A through Aetrix?
Please submit a Request for Quotation (RFQ) for CD54HC42F3A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CD54HC42F3A reliable?
The price and inventory of CD54HC42F3A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD54HC42F3A is usually 5 days.
3.What payment methods are accepted for CD54HC42F3A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD54HC42F3A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD54HC42F3A?
CD54HC42F3A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD54HC42F3A order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CD54HC42F3A?
For technical support, including CD54HC42F3A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD54HC42F3A requirements.
6.How does Aetrix verify that CD54HC42F3A is sourced from the original manufacturer or authorized distributors?
All CD54HC42F3A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CD54HC42F3A meets industry standards.
7.What is the process for return or replacement of CD54HC42F3A?
All CD54HC42F3A units undergo pre-shipment inspection (PSI). If there is an issue with CD54HC42F3A, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CD54HC42F3A part is unused and in its original packaging.
Return procedure for CD54HC42F3A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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