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Texas Instruments CD40257BMT
- Part No.:
- CD40257BMT
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD40257BMT.pdf
- Description:
- IC MULTIPLEXER 4 X 1:2 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,023
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Product details
Overview
CD40257BMT from Texas Instruments is a CMOS 4-bit dual 1-of-4 data selector/multiplexer with common strobe control, operating over –55°C to +125°C, featuring 3V–18V supply range, <1µA static current, and TTL/CMOS/LSTTL logic compatibility - used in industrial control logic routing and analog multiplexing interface circuits.
For engineers reviewing the CD40257BMT datasheet, CD40257BMT pinout, CD40257BMT application, or CD40257BMT equivalent, key selection considerations include its dual independent 4:1 select architecture, wide VDD tolerance, low-power static operation, and SOIC-16 packaging for space-constrained embedded timing and signal routing designs.
Technical Context
The CD40257BMT implements two independent 4-input multiplexers sharing a common strobe (G) and dual 2-bit select buses (S0/S1), enabling simultaneous or isolated channel selection. Each section outputs logical AND-OR of selected input (I0–I3) under active-low strobe enable.
It uses standard CMOS silicon-gate process technology, delivering rail-to-rail output swing, high noise immunity (>50% VDD), and symmetrical propagation delays (typ. 60 ns at 5V, 100 ns at 10V). Input thresholds are referenced to VDD/2, ensuring robust interfacing across mixed-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Dual 4:1 data selector/multiplexer with common strobe - enables two independent 4-channel routing paths in one IC |
| Supply Voltage Range | 3V to 18V - supports direct interface with 5V TTL, 3.3V logic, and legacy 12V/15V industrial rails |
| Static Current (IDD) | <1 µA at 25°C - allows battery-backed or ultra-low-power hold-mode operation without significant drain |
| Propagation Delay (tPD) | 60 ns max at VDD = 5V - sufficient for sub-10 MHz digital control sequencing and address decoding |
| Operating Temperature | –55°C to +125°C - qualified for extended-range industrial, aerospace, and downhole instrumentation environments |
| Input Logic Compatibility | TTL, CMOS, LSTTL - accepts standard 0.8V/2.0V thresholds and drives full-rail CMOS loads |
Pinout & Package
CD40257BMT is supplied in a 16-pin SOIC (Small-Outline Integrated Circuit) package, designated as SOIC-D, with 1.27 mm pitch, 10 mm body width, and tape-and-reel or tube delivery options.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5 | Section A inputs I0–I3 | Four data inputs for first 4:1 multiplexer; logic level passed to output YA when selected and strobed |
| 3 | Section A strobe (GA) | Active-low enable: YA = high-impedance unless GA = LOW and valid S0/S1 applied |
| 6, 7 | Section A select lines S0A, S1A | Binary address bus selecting one of four I0–I3 inputs to route to YA |
| 8 | VSS | Ground reference for all internal circuitry and I/O pins |
| 9, 10, 12, 13 | Section B inputs I0–I3 | Four data inputs for second independent 4:1 multiplexer feeding YB |
| 11 | Section B strobe (GB) | Independent active-low enable for Section B - allows asynchronous gating of YB |
| 14, 15 | Section B select lines S0B, S1B | Binary address bus for Section B; electrically isolated from Section A select lines |
| 16 | VDD | Positive supply rail; powers both sections and defines logic threshold and output swing |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4:1 multiplexers | Enables two separate data-routing paths on one die - reduces board area vs. discrete 74HC153 or dual CD4052 implementations |
| Common strobe per section | Allows selective enable/disable of each multiplexer without affecting the other - critical for time-multiplexed sensor readout or gated test signal injection |
| Wide VDD range (3V–18V) | Eliminates level-shifting in mixed-supply systems - interfaces directly with 3.3V microcontrollers and 12V analog front-ends |
| High noise immunity | Input threshold at VDD/2 ±15% ensures reliable operation in noisy industrial enclosures with >2Vpp EMI |
| SOIC-16 package | Standard surface-mount footprint compatible with automated assembly and reflow profiles (MSL Level-1) |
Applications
| Industrial PLC I/O Expansion | Legacy System Bus Multiplexing |
|---|---|
|
Use Scenario: Expanding discrete input points on a programmable logic controller by scanning multiple sensor banks through shared ADC channels. IC Role / Device Role / Timing Role: Dual 4:1 selector routes up to eight field sensors (four per section) to two ADC inputs under microcontroller address control. Use Value: Reduces component count by replacing two CD4052s; leverages shared S0/S1 bus and independent strobes for synchronized or staggered sampling. |
Use Scenario: Sharing a single 8-bit data bus between two peripheral controllers in a retro-computing or test equipment backplane. IC Role / Device Role / Timing Role: Acts as bidirectional bus switch controller - selects either controller's data lines onto common bus using strobe-gated arbitration. Use Value: Enables deterministic bus ownership handoff without contention; SOIC-16 fits tight backplane trace spacing. |
| Analog Signal Routing in Test Equipment | Redundant Sensor Interface for Safety Systems |
|
Use Scenario: Configurable signal path selection in automated test fixtures where DUT analog outputs must be routed to different measurement instruments. IC Role / Device Role / Timing Role: Routes four analog sensor outputs per section to differential amplifier inputs, with strobe-controlled isolation during switching. Use Value: Maintains signal integrity via low-charge-injection CMOS switches; wide VDD supports ±5V op-amp supplies. |
Use Scenario: Monitoring dual redundant temperature or pressure sensors in SIL-2-rated machinery controls, requiring independent validation paths. IC Role / Device Role / Timing Role: Provides physically separated signal selection for two safety channels - each section feeds independent ADCs with independent strobe control. Use Value: Supports fault-tolerant architecture by preventing single-point failure in multiplexer logic; –55°C to +125°C rating matches sensor operating envelope. |
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 |
|---|---|---|---|
| CD4052BM96 | Single 4:1 analog multiplexer with dual differential channels; no independent strobes; requires external logic for dual-section enable control | Limited to analog-only routing; lacks dual independent strobes needed for asynchronous gating of two data paths | Prefer CD40257BMT when discrete strobe control per section is required for time-isolated signal routing |
| 74HC153D | TTL-compatible dual 4:1 multiplexer; 2V–6V supply only; no extended temperature or high-voltage support | Suitable for commercial-grade 5V digital systems only; not rated for –55°C or >6V operation | Choose CD40257BMT for industrial, automotive, or wide-VDD applications beyond HC family limits |
Compared with CD4052BM96 and 74HC153D, the CD40257BMT uniquely delivers dual independent strobes, 3V–18V operation, and extended temperature range - making it the only option among the three qualified for harsh-environment dual-path digital/analog multiplexing without external glue logic.
Availability
CD40257BMT is available at Aetrix Electronics and suitable for industrial control systems, test instrumentation, and safety-critical sensor interface designs requiring stable component supply across long product lifecycles.
Supply support for CD40257BMT 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 company founded in 1930, specializing in analog, embedded processing, and logic ICs for industrial, automotive, and aerospace markets.
The CD40257BMT belongs to TI's legacy CD4000B series of radiation-tolerant, wide-supply CMOS logic devices - designed specifically for high-reliability, extended-temperature digital routing and control in mission-critical systems.
FAQ
What is the function of the strobe pins on the CD40257BMT?
The CD40257BMT has two independent strobe inputs: pin 3 (GA) for Section A and pin 11 (GB) for Section B. Both are active-low enables - when HIGH, the corresponding output (YA or YB) enters high-impedance state regardless of select inputs. This allows asynchronous disabling of each multiplexer section without affecting the other, supporting time-gated signal routing in CD40257BMT-based designs.
Does the CD40257BMT support analog signal switching?
Yes, the CD40257BMT supports analog multiplexing within its specified voltage range (VSS to VDD). Its CMOS transmission gates pass signals linearly with low on-resistance (typ. 125 Ω at 15V), minimal charge injection (<1 pC), and rail-to-rail capability - making it suitable for DC-coupled sensor signal routing in CD40257BMT applications up to ~1 MHz bandwidth.
What is the maximum clock or data rate supported by the CD40257BMT?
The CD40257BMT is not a clocked device but a combinatorial multiplexer. Its usable data rate depends on propagation delay and load capacitance. At VDD = 10V, tPD is typically 100 ns, supporting reliable operation up to ~5 MHz for clean digital waveforms with ≤50 pF load. For analog signals, bandwidth is limited by on-resistance and stray capacitance - typically ≤1 MHz for 1 kΩ source impedance in CD40257BMT configurations.
Is the CD40257BMT pin-compatible with the CD4052 or 74HC153?
No, the CD40257BMT is not pin-compatible with CD4052 (16-pin, but different pinout and single-section architecture) or 74HC153 (16-pin but incompatible strobe/select mapping and supply limitations). The CD40257BMT uses unique dual-strobe, dual-select topology - PCB layout must be designed specifically for CD40257BMT's pin assignment and functional partitioning.
What temperature grades are available for the CD40257BMT?
The CD40257BMT is offered in the standard industrial/military-extended grade: –55°C to +125°C. This rating applies to all active SOIC (M-suffix) variants including CD40257BMT. It is not available in commercial (0°C to +70°C) or automotive AEC-Q100 grades - the CD40257BMT specification is defined exclusively for extended-temperature operation per the TI CD4000B family datasheet SCHS108C.
CD40257BMT 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:
- Discontinued at Digi-Key
- 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
CD40257BMT FAQ
1.How can I place an order for CD40257BMT through Aetrix?
Please submit a Request for Quotation (RFQ) for CD40257BMT 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 CD40257BMT reliable?
The price and inventory of CD40257BMT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD40257BMT is usually 5 days.
3.What payment methods are accepted for CD40257BMT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD40257BMT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD40257BMT?
CD40257BMT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD40257BMT 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 CD40257BMT?
For technical support, including CD40257BMT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD40257BMT requirements.
6.How does Aetrix verify that CD40257BMT is sourced from the original manufacturer or authorized distributors?
All CD40257BMT 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 CD40257BMT meets industry standards.
7.What is the process for return or replacement of CD40257BMT?
All CD40257BMT units undergo pre-shipment inspection (PSI). If there is an issue with CD40257BMT, 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 CD40257BMT part is unused and in its original packaging.
Return procedure for CD40257BMT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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