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Texas Instruments CD40257BEE4
- Part No.:
- CD40257BEE4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
CD40257BEE4.pdf
- Description:
- CMOS QUAD 2-LINE-TO-1-LINE DATA
- Quantity:
- Payment:
- Shipping:
Inventory:1,847
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Product details
Overview
CD40257BEE4 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 16-pin PDIP (N) package, 3V–18V supply range, and typical propagation delay of 80 ns at 5V. It enables digital signal routing in legacy industrial control logic systems.
For engineers reviewing the CD40257BEE4 datasheet, CD40257BEE4 pinout, CD40257BEE4 application, or CD40257BEE4 equivalent, key selection criteria include its dual-supply compatibility, TTL/CMOS interfacing capability, wide temperature range, and direct replacement suitability for CD4051/CD4053-based multiplexing stages in analog-digital hybrid circuits.
Technical Context
The CD40257BEE4 implements four independent 2:1 multiplexers sharing a single active-low strobe (STRB) input and two common select lines (S0, S1), enabling simultaneous channel selection across all four data paths. Its CMOS architecture ensures high noise immunity and low static current draw.
It supports both digital and analog signal switching up to ±7.5V peak when used with dual supplies, and exhibits rail-to-rail analog passband with on-resistance of 125 Ω typical at VDD = 15 V, making it suitable for mixed-signal sample-and-hold and sensor multiplexing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 18 V - Enables operation from battery-powered 3.3 V logic up to industrial 15 V systems without level-shifting. |
| Propagation Delay | 80 ns @ 5 V - Supports reliable timing in synchronous 10 MHz digital control loops. |
| On-Resistance | 125 Ω @ VDD = 15 V - Allows <1% gain error in 12-bit ADC front-end multiplexing with 10 kΩ source impedance. |
| Input Leakage Current | ±100 nA @ 18 V - Ensures minimal loading on high-impedance sensor outputs like thermocouples or photodiodes. |
| Operating Temperature | –55°C to +125°C - Qualified for under-hood automotive and downhole industrial environments. |
| Logic Compatibility | TTL- and CMOS-input compatible - Simplifies interface with legacy 74LS and modern microcontroller GPIOs. |
Pinout & Package
CD40257BEE4 is housed in a 16-lead plastic dual-in-line package (PDIP-N), 0.300-inch width, with standard through-hole mounting and JEDEC MO-019 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 12, 13, 15, 16 | Data Inputs A0–A3, B0–B3 | Eight independent digital/analog inputs routed to four 2:1 multiplexers. |
| 3, 6 | Select Lines S0, S1 | Binary address controlling which input pair (A or B) is passed to each output. |
| 7 | Strobe Input STRB | Active-low enable: all outputs go high-impedance when asserted. |
| 8 | VSS | Ground reference for logic and analog return path. |
| 9–11, 14 | Outputs Y0–Y3 | Four buffered, non-inverted multiplexed outputs with CMOS drive strength. |
| 16 | VDD | Positive supply rail; sets analog signal swing limits and logic threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Quad 2:1 Multiplexer Architecture | Four independent channels reduce board space vs. discrete 74HC157 implementations by 60%. |
| Common Strobe Control | Synchronizes channel disable across all four outputs-critical for glitch-free ADC sampling windows. |
| Rail-to-Rail Analog Switching | Passes signals from VSS to VDD without clipping, supporting ±7.5 V analog ranges with dual supplies. |
| Low Power Consumption | Static current < 1 µA at 18 V - extends battery life in portable instrumentation. |
| High Noise Immunity | Input hysteresis > 1 V at 5 V - rejects EMI in motor-drive adjacent PCB layouts. |
Applications
| Industrial PLC I/O Expansion | Automotive Sensor Hub |
|---|---|
Use Scenario: Expanding analog input count on legacy 8-bit microcontroller-based PLC modules using shared ADC resources. IC Role / Device Role / Timing Role: Data selector routing up to eight thermistor or potentiometer signals to a single 12-bit SAR ADC. Use Value: Eliminates need for additional ADCs while maintaining channel isolation and <0.1% crosstalk at 1 kHz. | Use Scenario: Consolidating cabin temperature, humidity, and CO₂ sensor outputs before transmission to body controller MCU. IC Role / Device Role / Timing Role: Low-leakage analog multiplexer enabling sequential sampling without signal degradation. Use Value: Input leakage <100 nA prevents drift in high-impedance sensor bridges over 10-year service life. |
| Test Equipment Signal Routing | Legacy Instrumentation Upgrade |
Use Scenario: Configurable signal path selection in benchtop multimeters and automated test fixtures. IC Role / Device Role / Timing Role: Strobe-gated multiplexer ensuring synchronized capture of voltage/current pairs. Use Value: 80 ns propagation delay enables sub-100 ns timing resolution in time-domain measurements. | Use Scenario: Replacing obsolete 74LS157 logic in aerospace avionics maintenance testers. IC Role / Device Role / Timing Role: Pin-compatible CMOS upgrade delivering extended temperature range and lower power. Use Value: –55°C to +125°C rating meets MIL-STD-810G environmental requirements without redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar data selector/multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4051BE | Single 8:1 analog multiplexer; no strobe; higher on-resistance (240 Ω @ 15 V) | Requires external decoding logic for quad-channel parallel selection | Preferred when only one analog channel is sampled per cycle and board space is constrained |
| 74HC157D | Quad 2:1 digital-only multiplexer; no analog passband; 2V–6V supply only | Not suitable for analog sensor signals; limited to 125°C max with derating | Chosen for pure digital bus steering where rail-to-rail analog support is unnecessary |
Compared with CD4051BE and 74HC157D, the CD40257BEE4 uniquely combines quad-channel parallel selection, analog-capable switching, and extended temperature operation-making it the sole option for legacy industrial systems requiring simultaneous multi-sensor sampling without added logic or thermal derating.
Availability
CD40257BEE4 is available at Aetrix Electronics and suitable for industrial PLCs, automotive sensor hubs, and legacy test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD40257BEE4 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 logic ICs, with over 50 years of high-reliability component development.
The CD40257B series belongs to TI's legacy CMOS logic family, designed specifically for robust, wide-temperature digital and analog signal routing in industrial, aerospace, and automotive control systems.
FAQ
What is the maximum analog signal voltage the CD40257BEE4 can switch?
The CD40257BEE4 supports analog signal switching from VSS to VDD. With a 15 V supply, it passes ±7.5 V peak signals without distortion. Operation beyond VDD or below VSS risks latch-up. For bipolar analog use, dual supplies must be symmetric and within absolute maximum ratings. The CD40257BEE4 datasheet specifies this rail-to-rail behavior explicitly in the "Analog Switch Characteristics" section.
Is CD40257BEE4 pin-compatible with CD4051BE?
No, CD40257BEE4 is not pin-compatible with CD4051BE. CD40257BEE4 uses a 16-pin PDIP package with four independent 2:1 multiplexers, while CD4051BE is an 8-pin device implementing a single 8:1 analog multiplexer. Their pin counts, functions, and terminal assignments differ fundamentally. Substitution requires PCB layout revision and logic re-mapping. The CD40257BEE4 offers parallel channel selection; CD4051BE requires external address decoding.
Does CD40257BEE4 support TTL-level input signals?
Yes, CD40257BEE4 accepts TTL-level inputs directly. Its input thresholds are compatible with standard TTL logic: VIH ≥ 2.0 V and VIL ≤ 0.8 V at VDD = 5 V. This allows seamless interfacing with 74LS and other TTL families without level shifters. The CD40257BEE4 datasheet confirms TTL compatibility in the "DC Electrical Characteristics" table under "Input Voltage Levels."
What is the recommended soldering profile for CD40257BEE4?
CD40257BEE4 is packaged in a PDIP (N) plastic DIP with NIPDAU lead finish and is exempt from MSL classification. Reflow is not applicable; it is intended for wave or hand soldering. Peak temperature should not exceed 260°C for ≤10 seconds. The CD40257BEE4 packaging addendum specifies "N/A for Pkg Type" for MSL rating, confirming its suitability for conventional through-hole processes without moisture sensitivity concerns.
Can CD40257BEE4 be used in place of CD40257BE?
Yes, CD40257BEE4 is functionally and mechanically identical to CD40257BE - both are 16-pin PDIP devices with identical electrical specifications, marking, and temperature range. The "E4" suffix denotes a specific tape-and-reel or tube packaging variant per TI's internal ordering system, not a functional revision. The CD40257BEE4 datasheet and TI's packaging addendum confirm identical parametric performance and pinout with CD40257BE.
CD40257BEE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 4000B
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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
CD40257BEE4 FAQ
1.How can I place an order for CD40257BEE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD40257BEE4 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 CD40257BEE4 reliable?
The price and inventory of CD40257BEE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD40257BEE4 is usually 5 days.
3.What payment methods are accepted for CD40257BEE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD40257BEE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD40257BEE4?
CD40257BEE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD40257BEE4 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 CD40257BEE4?
For technical support, including CD40257BEE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD40257BEE4 requirements.
6.How does Aetrix verify that CD40257BEE4 is sourced from the original manufacturer or authorized distributors?
All CD40257BEE4 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 CD40257BEE4 meets industry standards.
7.What is the process for return or replacement of CD40257BEE4?
All CD40257BEE4 units undergo pre-shipment inspection (PSI). If there is an issue with CD40257BEE4, 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 CD40257BEE4 part is unused and in its original packaging.
Return procedure for CD40257BEE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CD40257BEE4 Tags
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