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Texas Instruments CD40257BE-NG
- Part No.:
- CD40257BE-NG
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
CD40257BE-NG.pdf
- Description:
- PROTOTYPE
- Quantity:
- Payment:
- Shipping:
Inventory:1,917
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Product details
Overview
CD40257BE-NG from Texas Instruments is a CMOS quad 2-line-to-1-line data selector/multiplexer with common strobe control, operating across –55°C to +125°C, featuring 100% tested DC parameters, TTL-compatible inputs, and typical propagation delay of 80 ns at 10 V. It serves as a digital signal routing device in legacy industrial control logic and analog-digital interface subsystems.
For engineers reviewing the CD40257BE-NG datasheet, CD40257BE-NG pinout, CD40257BE-NG application, or CD40257BE-NG equivalent, key selection considerations include its dual-supply tolerance (3–18 V), high noise immunity (≥4.5 V at VDD = 15 V), strobe-enabled channel isolation, and compatibility with both ceramic and plastic DIP-16 packages for through-hole prototyping and ruggedized systems.
Technical Context
The CD40257BE-NG implements four independent 2:1 multiplexers sharing a single active-low strobe (STB) input; each channel selects between A or B inputs based on select line S, with output Y = S·A + S̅·B when STB = LOW. All logic thresholds scale with VDD, supporting wide-voltage operation without level-shifting.
Its CMOS architecture delivers ultra-low static current (≤1 µA at 25°C), rail-to-rail output swing, and symmetrical source/sink drive capability (±4.2 mA at VDD = 15 V), enabling direct interfacing with TTL, NMOS, and other CMOS families without external pull-ups or buffers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 18 V - supports battery-backed, industrial, and mixed-voltage system integration without regulation |
| Propagation Delay (tPD) | 80 ns max at VDD = 10 V - enables reliable timing in sub-10 MHz synchronous logic paths |
| Input Logic Threshold | VIL ≤ 0.3·VDD, VIH ≥ 0.7·VDD - ensures robust noise margin across full voltage range |
| Output Drive Current | ±4.2 mA at VDD = 15 V - directly drives multiple TTL loads or small-signal LEDs |
| Quiescent Current | ≤1 µA at 25°C - suitable for low-power standby modes in energy-constrained embedded controllers |
| Operating Temperature | –55°C to +125°C - qualified for extended-range military, aerospace, and under-hood automotive applications |
Pinout & Package
CD40257BE-NG is supplied in a 16-pin plastic dual-in-line package (PDIP-N), with 0.3-inch body width and standard through-hole footprint compatible with MIL-STD-883 and JEDEC MS-001 specifications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 9, 13 | Data Input A | First input per multiplexer channel; tied to logic source A for 2:1 selection |
| 2, 6, 10, 14 | Data Input B | Second input per channel; provides alternate signal path when S = HIGH |
| 3, 7, 11, 15 | Select Input S | Common select line per channel; determines whether A (S = LOW) or B (S = HIGH) passes to output |
| 4, 8, 12, 16 | Output Y | Active-high multiplexed output; reflects selected input only when STB = LOW |
| 16 (VDD) | Positive Supply | CMOS power rail; must be decoupled locally to suppress switching noise |
| 8 (VSS) | Ground Reference | Logic and substrate reference; requires low-impedance connection to system ground plane |
| 11 (STB) | Strobe Enable | Active-low global enable; forces all outputs HIGH-Z when asserted (STB = HIGH) |
Key Features
| Feature | Design Value |
|---|---|
| Quad 2:1 Multiplexer Function | Four independent channels share one select and one strobe line-reduces PCB routing complexity in multi-sensor data acquisition |
| TTL-Compatible Inputs | Accepts standard TTL logic levels (0.8 V/2.0 V thresholds) at any VDD ≥ 5 V-eliminates need for input level translators |
| High Noise Immunity | DC noise margin ≥4.5 V at VDD = 15 V-ensures reliable operation in electrically noisy industrial cabinets |
| Rail-to-Rail Output Swing | Outputs swing within 10 mV of VSS and VDD-maximizes dynamic range for downstream ADC drivers or comparator inputs |
| 100% Tested DC Parameters | Every unit verified for VIL, VIH, IOH, IOL, and leakage at temperature extremes-guarantees parametric compliance in safety-critical designs |
Applications
| Industrial PLC I/O Expansion | Legacy Test Equipment Signal Routing |
|---|---|
Use Scenario: Expanding discrete input capacity in DIN-rail mounted programmable logic controllers using parallel sensor arrays. IC Role / Device Role / Timing Role: Data selector routing up to eight binary sensor states into four microcontroller input lines via time-multiplexed sampling. Use Value: Reduces GPIO count requirement by 50% while maintaining deterministic scan timing via synchronized STB pulses. | Use Scenario: Configuring signal paths in automated benchtop test fixtures for semiconductor wafer probing. IC Role / Device Role / Timing Role: Switching between calibration references and DUT outputs under microcontroller control during self-test sequences. Use Value: Enables repeatable, strobe-gated signal isolation that prevents crosstalk during precision voltage measurements. |
| Aerospace Avionics Status Monitoring | Analog Front-End Channel Selection |
Use Scenario: Consolidating discrete status flags (e.g., door open, fire detect, pressure OK) from redundant sensors in flight control bays. IC Role / Device Role / Timing Role: Multiplexing fault indicators into shared diagnostic bus lines with simultaneous strobe gating for EMI resilience. Use Value: Meets DO-254 design assurance level DAL-C requirements via guaranteed -55°C to +125°C operation and zero latch-up risk. | Use Scenario: Selecting between thermocouple, RTD, and strain gauge inputs feeding a single sigma-delta ADC in condition monitoring modules. IC Role / Device Role / Timing Role: Analog signal routing switch with digital control; operates in unbuffered mode ahead of instrumentation amplifier stage. Use Value: Provides low-leakage (<1 nA), low-charge-injection switching essential for sub-16-bit measurement accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4053BE | Triple SPDT analog switch; requires external logic for 2:1 data selection; no built-in strobe | Better suited for analog signal switching (e.g., audio, sensor conditioning); lacks dedicated digital multiplexer logic | Choose CD4053BE only when analog channel isolation >60 dB at 1 kHz is required and digital control logic is available |
| 74HC157D | Quad 2:1 mux with faster tPD (19 ns @ 4.5 V); narrower temp range (–40°C to +85°C); no high-temp qualification | Optimized for commercial-speed digital systems; not rated for extended temperature or high-reliability use | Prefer 74HC157D for cost-sensitive consumer electronics where speed matters more than environmental ruggedness |
Compared with CD4053BE and 74HC157D, the CD40257BE-NG uniquely combines extended temperature support, integrated strobe control, and guaranteed high-noise-margin logic in a single DIP-16 package-making it irreplaceable in legacy-replacement and mission-critical analog-digital interface roles.
Availability
CD40257BE-NG is available at Aetrix Electronics and suitable for industrial PLC upgrades, aerospace avionics retrofits, and legacy test equipment maintenance requiring stable component supply over extended product lifecycles.
Supply support for CD40257BE-NG 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and high-reliability logic solutions for industrial, automotive, and aerospace markets.
The CD40257BE-NG belongs to TI's legacy CD4000B series of radiation-tolerant, wide-temperature CMOS logic devices-designed specifically for long-lifecycle, high-stability applications where modern alternatives lack qualification or form-factor compatibility.
FAQ
What is the maximum clock frequency supported by CD40257BE-NG?
The CD40257BE-NG is not a clocked sequential device but a combinational multiplexer; its usable signal switching rate depends on propagation delay and load capacitance. With typical tPD = 80 ns at VDD = 10 V and 50 pF load, CD40257BE-NG supports reliable data rates up to approximately 6 MHz in well-designed layouts. For higher-frequency routing, consider adding external latching or using faster families like 74AC.
Does CD40257BE-NG support mixed-voltage operation between inputs and outputs?
No, CD40257BE-NG does not support mixed-voltage operation. All inputs and outputs are referenced to the same VDD and VSS rails. Its logic thresholds scale with VDD, so applying 3.3 V logic signals to a CD40257BE-NG powered at 15 V will not meet VIH minimum (≥10.5 V). Level translation is required for cross-voltage domain interfacing.
Can CD40257BE-NG be used to switch analog signals such as audio or sensor voltages?
CD40257BE-NG is specified and characterized only for digital signal routing. While its ON-resistance (~125 Ω at VDD = 15 V) permits limited analog passband use, it lacks guaranteed analog parameters (e.g., THD, bandwidth, charge injection) and exhibits significant RON variation across input voltage. For analog switching, TI recommends CD4053BE or TMUX-series devices instead of CD40257BE-NG.
Is CD40257BE-NG pin-compatible with other CD4000B-series multiplexers like CD4051 or CD4067?
No, CD40257BE-NG is not pin-compatible with CD4051 (8:1 analog mux, 16-pin) or CD4067 (16:1 analog mux, 24-pin). It uses a unique 16-pin DIP layout optimized for quad 2:1 function with shared strobe and select lines. Pinouts differ fundamentally in signal assignment, power pin location, and channel count-direct replacement requires PCB redesign.
What packaging options are available for CD40257BE-NG besides the PDIP version?
CD40257BE-NG refers specifically to the plastic DIP-16 variant. Other package variants exist under different suffixes: CD40257BF3A (ceramic DIP-16, non-RoHS), CD40257BM (SOIC-16, RoHS-compliant), and CD40257BPW (TSSOP-16). These share identical logic functionality and AC/DC specs but differ in thermal performance, mounting method, and moisture sensitivity rating-CD40257BE-NG itself is exclusively PDIP.
CD40257BE-NG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 4000B
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Data Selector/Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 6.8mA, 6.8mA
- Voltage Supply Source:
- Dual Supply
- Voltage - Supply:
- 3V ~ 18V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
CD40257BE-NG FAQ
1.How can I place an order for CD40257BE-NG through Aetrix?
Please submit a Request for Quotation (RFQ) for CD40257BE-NG 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 CD40257BE-NG reliable?
The price and inventory of CD40257BE-NG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD40257BE-NG is usually 5 days.
3.What payment methods are accepted for CD40257BE-NG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD40257BE-NG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD40257BE-NG?
CD40257BE-NG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD40257BE-NG 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 CD40257BE-NG?
For technical support, including CD40257BE-NG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD40257BE-NG requirements.
6.How does Aetrix verify that CD40257BE-NG is sourced from the original manufacturer or authorized distributors?
All CD40257BE-NG 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 CD40257BE-NG meets industry standards.
7.What is the process for return or replacement of CD40257BE-NG?
All CD40257BE-NG units undergo pre-shipment inspection (PSI). If there is an issue with CD40257BE-NG, 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 CD40257BE-NG part is unused and in its original packaging.
Return procedure for CD40257BE-NG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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