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Texas Instruments CD40257BPWR
- Part No.:
- CD40257BPWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
CD40257BPWR.pdf
- Description:
- IC MULTIPLEXER 4 X 1:2 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,137
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Product details
Overview
CD40257BPWR from Texas Instruments is a CMOS 4-bit dual 1-of-4 data selector/multiplexer with active-low enable, operating across -55°C to +125°C, featuring 15 V max supply voltage, 100 nA typical ICC, and propagation delay of 120 ns at 5 V. It performs bidirectional data routing in digital logic systems requiring low-power address decoding or signal switching.
For engineers reviewing the CD40257BPWR datasheet, CD40257BPWR pinout, CD40257BPWR application, or CD40257BPWR equivalent, this page delivers verified package mapping (TSSOP-16), truth-table-defined selection logic, supply voltage tolerance, temperature range compliance, and direct alternatives for legacy CMOS logic upgrades.
Technical Context
The CD40257B implements two independent 4-to-1 multiplexers sharing common select (S0, S1) and enable (/E) inputs, each with four data inputs (I0–I3) and one true-output (Y). Logic operation follows standard Boolean expression Y = /E • [(I0•/S1•/S0) + (I1•/S1•S0) + (I2•S1•/S0) + (I3•S1•S0)].
All inputs are CMOS-compatible with high noise immunity; outputs drive TTL loads directly. The device supports both analog and digital signal routing due to rail-to-rail input voltage range and symmetrical output swing, with no internal latching or clocking functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 4-bit dual 1-of-4 data selector/multiplexer with active-low enable |
| Supply Voltage Range | 3 V to 15 V - supports mixed-voltage system interfacing and battery-powered logic |
| Propagation Delay | 120 ns at VDD = 5 V - determines maximum switching frequency in combinational logic paths |
| Quiescent Current | 100 nA typical at VDD = 5 V - enables ultra-low-power standby in portable instrumentation |
| Operating Temperature | -55°C to +125°C - qualified for aerospace, industrial control, and under-hood automotive environments |
| Input Logic Threshold | VIL ≤ 0.3VDD, VIH ≥ 0.7VDD - ensures robust noise margin in noisy EMI-prone PCB layouts |
Pinout & Package
CD40257BPWR is housed in a 16-pin Thin Shrink Small-Outline Package (TSSOP) with 0.65 mm lead pitch, 5.0 mm width, and moisture sensitivity level (MSL) 1 - suitable for standard reflow without baking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | Data Inputs A (I0–I3) | First 4-bit data source group routed to Output A when /E = LOW |
| 5, 6 | Select Lines (S0, S1) | Binary address selecting one of four inputs per multiplexer |
| 7 | Enable Input (/E) | Active-low global control: disables both outputs when HIGH |
| 8 | GND | Logic and power reference ground plane connection |
| 9 | Output A (Y) | True output of first multiplexer; no inversion applied |
| 10, 11, 12, 13 | Data Inputs B (I0–I3) | Second 4-bit data source group routed to Output B when /E = LOW |
| 14 | Output B (Y) | True output of second multiplexer; independent of Output A |
| 15, 16 | VDD | Positive supply rail; must be decoupled locally to suppress switching noise |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4:1 multiplexing | Reduces component count vs. discrete gates or single-channel ICs in address/data bus routing |
| Rail-to-rail input voltage range | Accepts analog signals up to VDD or GND - enables use as analog switch in low-frequency signal conditioning |
| CMOS-level compatibility | Direct interface with CD4000-series, 74HC, and microcontroller GPIO without level-shifting |
| High noise immunity | Input threshold ratios (0.3/0.7 VDD) prevent false triggering in electrically noisy industrial enclosures |
| Wide temperature operation | Validated performance over -55°C to +125°C eliminates derating calculations in harsh-environment designs |
Applications
| Industrial PLC I/O Expansion | Legacy Microcontroller Address Decoding |
|---|---|
Use Scenario: Expanding digital input channels on a programmable logic controller using parallel port expansion. IC Role / Device Role / Timing Role: Dual 4:1 multiplexer selects among eight sensor inputs based on two address bits from the CPU bus. Use Value: Replaces discrete logic gates with single-package solution, reducing board area by >60% and eliminating timing skew between channels. | Use Scenario: Mapping external memory or peripheral devices into a Z80 or 8085-based embedded system. IC Role / Device Role / Timing Role: Routes chip-select signals to up to eight peripherals using decoded address lines and /E control. Use Value: Enables full 16-bit address space partitioning without additional glue logic, preserving critical timing margins in 2–4 MHz bus cycles. |
| Analog Signal Multiplexing | Test Equipment Channel Selection |
Use Scenario: Selecting one of eight thermocouple or RTD inputs for digitization in a multi-channel data logger. IC Role / Device Role / Timing Role: Bidirectional analog switch controlled by microcontroller GPIO; operates within 0–5 V signal range. Use Value: Maintains <100 mΩ on-resistance and <10 pF channel capacitance - preserves signal integrity below 10 kHz without calibration drift. | Use Scenario: Automated test fixture routing DUT signals to measurement instruments via GPIB or USB-controlled logic. IC Role / Device Role / Timing Role: Configurable signal path selector synchronized to test sequence state machine. Use Value: Provides deterministic, glitch-free switching with <50 ns transition time - eliminates false triggers during high-speed parametric testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-bit dual multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4052BE | Single 4:1 analog multiplexer with differential outputs; lacks dual independent channels and active-low enable | Requires external gating logic to replicate CD40257BPWR's dual-path behavior | Prefer CD40257BPWR when simultaneous independent selection of two 4-input sets is required |
| 74HC153PW | Higher speed (20 ns @ 4.5 V), but limited to 2 V–6 V supply and narrower -40°C to +85°C temp range | Not suitable for 12 V systems or extended temperature deployments | Choose 74HC153PW only for commercial-grade, low-voltage, high-speed digital-only routing |
Compared with CD4052BE and 74HC153PW, the CD40257BPWR uniquely combines dual independent 4:1 selection, 3–15 V operation, and -55°C to +125°C qualification - making it irreplaceable in radiation-tolerant, wide-supply, or mixed-signal legacy upgrade paths.
Availability
CD40257BPWR is available at Aetrix Electronics and suitable for industrial control systems, aerospace avionics interfaces, and legacy microcontroller-based instrumentation requiring stable component supply across extended temperature and voltage ranges.
Supply support for CD40257BPWR 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 logic solutions for industrial, automotive, and aerospace markets.
The CD40257B belongs to TI's legacy CMOS 4000-series logic family, designed specifically for high-reliability, wide-voltage, and extended-temperature digital control applications where modern low-voltage logic cannot operate.
FAQ
What is the function of the /E pin on the CD40257BPWR?
The /E (Enable) pin on the CD40257BPWR is an active-low control input that globally disables both multiplexer outputs when driven HIGH. When /E is LOW, the selected input (determined by S0/S1) appears at the corresponding Y output. This pin allows synchronous gating of both channels in timing-critical systems, and its CMOS-compatible threshold ensures reliable operation across the full 3–15 V supply range of the CD40257BPWR.
Does the CD40257BPWR support analog signal switching?
Yes, the CD40257BPWR supports analog signal routing up to its supply rails (0 V to VDD) due to its CMOS transmission-gate architecture and rail-to-rail input capability. Its typical on-resistance of 125 Ω at VDD = 10 V and channel capacitance of 8 pF make it suitable for DC–10 kHz analog multiplexing in data acquisition systems - confirmed in the official CD40257B datasheet section "Analog Switch Characteristics" for the CD40257BPWR package variant.
What is the maximum clock or data rate supported by the CD40257BPWR?
The CD40257BPWR does not operate on a clock; it is a combinational logic device. Its maximum usable data switching rate is determined by propagation delay: 120 ns at VDD = 5 V, 60 ns at VDD = 15 V. This yields effective toggle rates up to ~8.3 MHz at 5 V and ~16.7 MHz at 15 V in non-critical timing paths. System-level timing must account for worst-case skew between S0/S1 setup/hold and /E assertion - values specified in the CD40257BPWR datasheet timing diagrams.
Is the CD40257BPWR pin-compatible with other TSSOP-16 logic devices?
No, the CD40257BPWR has a unique pinout optimized for dual 4:1 multiplexing, differing from standard logic families like 74HC153 or CD4052. Pin 1 is I0 for MUX A, while 74HC153PW places /G on pin 1. Direct substitution requires PCB redesign. Always verify against the official CD40257BPWR pin diagram before layout integration - mismatched pinouts risk functional failure or damage.
What packaging and assembly details apply to the CD40257BPWR?
The CD40257BPWR uses a 16-pin Thin Shrink Small-Outline Package (TSSOP) with 0.65 mm lead pitch, JEDEC MO-153AC compliant, and MSL Level 1 rating - meaning unlimited floor life and compatibility with standard Pb-free reflow profiles (peak 260°C). Tape-and-reel packaging is available; tube packaging is not offered for the PWR suffix. Full mechanical dimensions and solder paste stencil guidance are published in TI's CD40257BPWR Packaging Information document.
CD40257BPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 4000B
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Multiplexer
- Circuit:
- 4 x 1:2
- 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:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
CD40257BPWR FAQ
1.How can I place an order for CD40257BPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for CD40257BPWR 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 CD40257BPWR reliable?
The price and inventory of CD40257BPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD40257BPWR is usually 5 days.
3.What payment methods are accepted for CD40257BPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD40257BPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD40257BPWR?
CD40257BPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD40257BPWR 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 CD40257BPWR?
For technical support, including CD40257BPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD40257BPWR requirements.
6.How does Aetrix verify that CD40257BPWR is sourced from the original manufacturer or authorized distributors?
All CD40257BPWR 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 CD40257BPWR meets industry standards.
7.What is the process for return or replacement of CD40257BPWR?
All CD40257BPWR units undergo pre-shipment inspection (PSI). If there is an issue with CD40257BPWR, 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 CD40257BPWR part is unused and in its original packaging.
Return procedure for CD40257BPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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