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Texas Instruments CD40257BM96E4
- Part No.:
- CD40257BM96E4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD40257BM96E4.pdf
- Description:
- IC MULTIPLEXER 4 X 1:2 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,782
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Product details
Overview
CD40257BM96E4 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, 3V–18V supply range, and TTL/CMOS/MOS logic compatibility. It serves as a bidirectional data routing device in digital control systems requiring signal path selection under enable gating.
For engineers reviewing the CD40257BM96E4 datasheet, CD40257BM96E4 pinout, CD40257BM96E4 application, or CD40257BM96E4 equivalent, key selection criteria include its dual-supply tolerance, guaranteed propagation delay (max 120 ns at 5V), input hysteresis for noise immunity, rail-to-rail output swing, and SOIC-16 package suitability for space-constrained industrial control PCBs.
Technical Context
The CD40257BM96E4 implements four independent 2:1 multiplexers sharing a single active-low strobe (STRB) input that disables all outputs when high. Each channel selects between two digital inputs (A or B) based on a common select line (S), with output polarity matching input logic state.
It uses standard CMOS silicon-gate process technology, ensuring low static current (≤1 µA at 18V), high noise margin (>45% of VDD), and symmetrical rise/fall times. Input thresholds are referenced to VDD/2, enabling reliable operation across its full 3V–18V supply range without external biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3V to 18V - supports direct interface with legacy 5V TTL, modern 3.3V logic, and high-voltage industrial sensors without level-shifting. |
| Propagation Delay (tPD) | 120 ns max at VDD = 5V - enables use in synchronous control loops up to ~4 MHz clock rate with setup/hold margin. |
| Output Drive Capability | ±4.2 mA at VDD = 15V - sufficient to directly drive multiple 74HC inputs or small LED indicators without buffer stages. |
| Input Hysteresis | Typically 0.8V at VDD = 10V - suppresses false switching from slow-rising or noisy control signals like mechanical switch debouncing. |
| Quiescent Current (IDD) | ≤1 µA at VDD = 18V - allows battery-backed operation in low-power monitoring circuits for >10-year shelf life. |
| Operating Temperature | –55°C to +125°C - qualified for under-hood automotive, downhole instrumentation, and military-grade environmental enclosures. |
Pinout & Package
CD40257BM96E4 is housed in a 16-pin Small Outline Integrated Circuit (SOIC) package with 1.27 mm pitch, JEDEC MS-012 compliant, body size 9.9 mm × 3.9 mm × 1.75 mm, moisture sensitivity level 1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 9, 13 | Data Input A (A0–A3) | First input per multiplexer channel; tied to system data bus A-side or sensor primary output. |
| 2, 6, 10, 14 | Data Input B (B0–B3) | Second input per channel; used for redundancy, calibration reference, or alternate signal source. |
| 3, 7, 11, 15 | Output Y (Y0–Y3) | Active-high selected output; drives downstream latch, ADC sample-enable, or display segment driver. |
| 4 | Select Line (S) | Common 2:1 select control; low = route A inputs, high = route B inputs across all four channels. |
| 8 | GND | Logic and power ground reference; must be low-impedance connection to minimize ground bounce in mixed-signal layouts. |
| 16 | VDD | Positive supply rail; decoupling capacitor (0.1 µF ceramic) required within 5 mm for stable high-speed switching. |
| 12 | Strobe (STRB) | Active-low global enable; pulls all outputs to high-impedance when high, enabling bus-sharing or power-gating. |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent 2:1 multiplexing | Four isolated data paths share only S and STRB controls-enables compact routing of parallel sensor pairs or dual-mode I/O banks. |
| Rail-to-rail output swing | Outputs swing within 10 mV of VDD and GND-eliminates need for pull-up resistors in CMOS loads and ensures full logic-level compatibility. |
| 100% tested DC parameters | Every production unit verified for VIL, VIH, VOL, VOH, IIL, IOH across temperature-reduces qualification testing effort for safety-critical designs. |
| High noise immunity | Input hysteresis ≥0.5V typical across full VDD range-tolerates EMI-coupled transients on long traces in motor-drive or RF-adjacent environments. |
Applications
| Industrial PLC I/O Expansion | Automotive Sensor Signal Routing |
|---|---|
Use Scenario: Adding configurable analog/digital input modules to programmable logic controllers where field wiring may connect to either primary or backup sensor sets. IC Role / Device Role / Timing Role: Data selector routing conditioned sensor outputs to ADC input or isolation barrier based on configuration bit or fault status. Use Value: Enables single PCB design to support dual-sensor redundancy schemes without additional logic gates or FPGA resources. | Use Scenario: Managing signal paths from dual oxygen sensors (pre- and post-catalyst) to engine control unit during cold-start and diagnostic modes. IC Role / Device Role / Timing Role: Strobe-controlled multiplexer selecting between upstream/downstream O₂ sensor outputs under ECU command for closed-loop fuel trim calculation. Use Value: Reduces harness complexity by eliminating separate sensor cables and allows shared ADC channel with deterministic timing via STRB synchronization. |
| Military Avionics Mode Switching | Test Equipment Signal Path Calibration |
Use Scenario: Selecting between primary flight control computer outputs and backup guidance signals in fly-by-wire systems during fail-operational transitions. IC Role / Device Role / Timing Role: Quad MUX providing synchronized routing of four critical control axes (pitch, roll, yaw, thrust) with simultaneous strobe disable during mode change. Use Value: Meets DO-254 Level A deterministic timing requirements with <120 ns channel-to-channel skew and guaranteed glitch-free switching. | Use Scenario: Calibrating multi-channel oscilloscope front-ends by routing precision reference voltages or test waveforms into each channel's gain stage. IC Role / Device Role / Timing Role: Channel-selectable reference injection point enabling automated per-channel offset/gain correction without relay-based switching. Use Value: Improves calibration repeatability by removing mechanical contact resistance variation and supporting sub-microsecond switching between calibration steps. |
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; no strobe control; higher on-resistance (120 Ω typ); requires external logic for 2:1 selection logic. | Designed for analog signal switching (e.g., audio, sensor conditioning); not rated for digital bus routing above 1 MHz. | Choose only if analog signal integrity (bandwidth, THD) is prioritized over digital timing control and strobe functionality. |
| 74HC157DR | Quad 2:1 MUX with 2V–6V supply range; faster tPD (19 ns @ 4.5V); no extended temperature rating; no strobe pin-outputs always enabled. | Optimized for commercial-grade 5V digital systems; lacks –55°C support and high-voltage tolerance for industrial transducer interfaces. | Prefer for cost-sensitive consumer electronics where speed matters more than wide VDD range or extreme temperature operation. |
Compared with CD40257BM96E4, CD4053BE trades digital control simplicity for analog performance, while 74HC157DR sacrifices supply flexibility and ruggedness for speed-making CD40257BM96E4 uniquely suited for high-reliability, multi-voltage, strobe-gated digital routing.
Availability
CD40257BM96E4 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive sensor signal routing, and military avionics mode switching requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD40257BM96E4 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.
CD40257BM96E4 belongs to TI's CD4000B series of radiation-tolerant, high-voltage CMOS logic devices designed for mission-critical control systems where supply flexibility, temperature resilience, and deterministic switching behavior are mandatory.
FAQ
What is the maximum clock frequency supported by CD40257BM96E4 in a synchronous multiplexing application?
The CD40257BM96E4 does not operate on a clock signal-it is a combinational logic device with propagation delay specified at 120 ns maximum at VDD = 5V. Its effective maximum toggle rate depends on system setup/hold timing; for clean 2:1 selection with 50 ns margins, it supports control signal transitions up to approximately 4 MHz. The CD40257BM96E4 datasheet confirms this limit via tPD and tW (minimum pulse width) specifications.
Does CD40257BM96E4 support mixed-voltage operation, such as 5V inputs driving a 12V-powered CD40257BM96E4?
Yes, CD40257BM96E4 supports mixed-voltage interfacing: inputs are fully compatible with TTL (0.8V/2.0V thresholds) and CMOS logic levels across its entire 3V–18V supply range. A 5V-input signal applied to a CD40257BM96E4 powered at 12V will be correctly interpreted, and outputs swing rail-to-rail at 12V-enabling direct interface between legacy 5V subsystems and higher-voltage control domains without level shifters.
Is CD40257BM96E4 pin-compatible with CD4053BE or other CD4000-series multiplexers?
No, CD40257BM96E4 is not pin-compatible with CD4053BE: CD40257BM96E4 uses a 16-pin SOIC layout with dedicated A/B/Y/STRB/S pins, while CD4053BE is a 16-pin SOIC with three independent SPDT analog switches, different pin assignments, and no strobe function. Pin mapping differs entirely-PCB redesign is required for substitution. Always verify pinout diagrams before replacement.
What is the purpose of the strobe (STRB) pin on CD40257BM96E4, and how should it be used in practice?
The strobe (STRB) pin on CD40257BM96E4 is an active-low global output enable that places all four Y outputs in high-impedance state when asserted high. This allows CD40257BM96E4 to share a common data bus with other devices or implement power-gated signal routing. In practice, tie STRB low for normal operation; drive it high during system reset, standby, or when isolating downstream circuitry-ensuring no contention on shared lines.
Can CD40257BM96E4 be used in analog signal switching applications, such as audio or sensor conditioning paths?
CD40257BM96E4 is characterized and specified only for digital logic-level switching-not analog signal routing. Its on-resistance (typ. 125 Ω at VDD = 15V) and charge injection (±0.5 pC) are uncharacterized for analog use, and no bandwidth, THD, or crosstalk data is provided in the CD40257BM96E4 datasheet. For analog paths, TI recommends CD4053BE or TS5A23157; CD40257BM96E4 should be limited to digital data selection tasks.
CD40257BM96E4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 4000B
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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-SOIC
CD40257BM96E4 FAQ
1.How can I place an order for CD40257BM96E4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD40257BM96E4 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 CD40257BM96E4 reliable?
The price and inventory of CD40257BM96E4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD40257BM96E4 is usually 5 days.
3.What payment methods are accepted for CD40257BM96E4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD40257BM96E4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD40257BM96E4?
CD40257BM96E4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD40257BM96E4 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 CD40257BM96E4?
For technical support, including CD40257BM96E4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD40257BM96E4 requirements.
6.How does Aetrix verify that CD40257BM96E4 is sourced from the original manufacturer or authorized distributors?
All CD40257BM96E4 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 CD40257BM96E4 meets industry standards.
7.What is the process for return or replacement of CD40257BM96E4?
All CD40257BM96E4 units undergo pre-shipment inspection (PSI). If there is an issue with CD40257BM96E4, 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 CD40257BM96E4 part is unused and in its original packaging.
Return procedure for CD40257BM96E4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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