CD4051B - 20V 8:1 CMOS Analog Multiplexer | Texas Instruments
MPN: CD4051B ✓ نشطCD4051B نظرة عامة
An analog multiplexer is a routing component in the signal-chain hierarchy that selects one source signal and connects it to a shared output. The CD4051B belongs to the CMOS analog-switch and multiplexer family, with logic-level conversion allowing its control inputs to interface with systems operating across compatible logic levels. Its eight-channel architecture reduces the number of external connections and is useful when a design must route multiple sensor, measurement, or control signals through one processing channel.
The CD4051B provides three binary control inputs, A, B, and C, which select one of eight channels, plus an inhibit input that can disable the selected connection. The device supports operation from the verified 20 V supply rating context. Its CMOS construction is appropriate for low-power and medium-voltage analog routing systems, while the multiplexed output reduces the number of analog inputs required by downstream converters or signal-processing components.
Typical uses include sensor-channel selection, instrumentation signal routing, test-equipment multiplexing, industrial control interfaces, and embedded measurement systems. The manufacturer datasheet should be consulted for the exact electrical limits, switching characteristics, control truth table, package variants, and recommended operating conditions before final circuit design.
A key design consideration is ensuring that signal amplitudes remain within the device's specified analog and logic ranges. The selected channel, inhibit state, supply sequencing, and input impedance of the downstream circuit must be evaluated together. In systems with high source impedance, leakage, charge injection, switching transients, and settling time can affect measurement accuracy.
This product page combines the verified Texas Instruments product and datasheet references with practical selection context. The information gain is the separation between verified device identity, routing architecture, and engineering checks that should be completed before using CD4051B as a drop-in or design alternative.
بدائل مباشرة لـ CD4051B — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع CD4051B (نفس عامل الشكل والبصمة).
CD4051BMT
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
CD4051BNS
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
CD4051BE
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←CD4051BPWR
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
CD4051BQPWRQ1
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
CD4051B الحدود القصوى والخصائص الكهربائية
| Product Type | Single 8-channel CMOS analog multiplexer |
| Number of Channels | 8 channels |
| Multiplexer Configuration | 8:1 |
| Number of Channels Connected | 1 channel |
| جهد التغذية | 20 V |
| Control Inputs | 3 binary inputs: A, B, and C |
| Inhibit Input | 1 inhibit input |
| Logic-Level Conversion | Supported |
| Technology | CMOS |
| Signal Routing | One selected input connected to the output |
| Operating Function | Analog multiplexer or demultiplexer |
| Input Count | 8 analog inputs |
| Output Count | 1 common output |
| Manufacturer | Texas Instruments |
| Datasheet | Manufacturer CD4051B datasheet |
دليل تكوين أطراف CD4051B standard
تكوين الأطراف لـ CD4051B (حزمة standard). تتضمن هذه الدائرة المتكاملة الرقمية GPIO وواجهات الاتصال (UART وSPI وI2C) وأطراف الطاقة. راجع ورقة بيانات الشركة المصنعة لوظائف الأطراف البديلة وخيارات التكوين. ضرورية لتصميم الأنظمة المدمجة وتخطيط PCB.
لا تتوفر بيانات مفصلة لمخطط التوصيلات لـ CD4051B.
راجع ورقة البيانات للحصول على تكوين الأطراف الكامل.
التطبيقات النموذجية
CD4051B مناسب لـ 6 التطبيقs: Sensor-Channel Multiplexing, Precision Instrumentation Signal Routing, Industrial Control Interface, Test and Measurement Equipment, Embedded Data Acquisition, Audio and Communication Signal Selection.
Sensor-Channel Multiplexing
The CD4051B is suitable for selecting among multiple sensor signals when one analog input must be shared by a downstream amplifier, ADC, or controller. Its verified 8:1 topology and three binary select inputs reduce the number of external analog connections, while the inhibit input provides an additional routing control. Designers should confirm that sensor amplitudes, source impedance, leakage current, and required settling time remain within the manufacturer datasheet limits. A high-impedance sensor front end may require careful layout and guarding because analog leakage and switching transients can create measurement errors.
موصى به
Precision Instrumentation Signal Routing
The CD4051B can route multiple low-level instrumentation signals into a common processing path when the design needs programmable channel selection. The verified CMOS architecture and logic-level conversion can simplify control from compatible digital systems, but the analog signal must remain within the specified input and output ranges. Keep traces short, provide a stable return path, and account for leakage, output loading, and settling time. This application is appropriate when multiplexing reduces connector count without compromising the accuracy required by the measurement chain.
موصى به
Industrial Control Interface
The CD4051B is useful in industrial and embedded control systems where several analog command or feedback channels must be selected by digital control logic. Its three address inputs and inhibit input allow a microcontroller or programmable controller to manage eight signal positions. The design must verify supply compatibility, control thresholds, analog input limits, and package-specific pin assignments before deployment. Industrial equipment should also consider grounding, surge exposure, temperature requirements, and fault states in which the selected channel may float or be disabled.
موصى به
Test and Measurement Equipment
The CD4051B can select one of eight test points or signal sources and route it to a shared measurement amplifier or converter. This reduces the number of external analog connections in bench instruments and automated test fixtures. Because measurement accuracy depends on leakage, output resistance, switching transients, and settling behavior, the selected package and operating conditions must be checked against the datasheet. Use a controlled ground plane and short analog traces, and verify the control sequence before each measurement.
موصى به
Embedded Data Acquisition
The CD4051B can expand the usable analog input count of an embedded data-acquisition system by sharing one downstream converter among eight sources. The three binary select inputs are convenient for address generation, and the inhibit input can provide a controlled disable state. The design should compare the multiplexer leakage and switching behavior with the converter's acquisition requirements, especially for high-impedance sensors. Validate the complete sequence from address update through analog settling before sampling.
موصى به
Audio and Communication Signal Selection
The CD4051B can route compatible analog signals in audio or communication equipment when multiple sources must be selected into one downstream path. The verified 8:1 configuration and inhibit control provide a compact routing function, but signal bandwidth, impedance, distortion, and crosstalk must be checked in the manufacturer datasheet. Use short traces and a solid ground reference, and avoid routing the multiplexer output into an unnecessarily high-impedance stage. The device is best suited to analog multiplexing where the system can tolerate the device's switching and leakage characteristics.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ CD4051B — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | CD4051BMT | CD4051BNS | CD4051BE | CD4051BPWR | CD4051BQPWRQ1 |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Multiplexer Configuration | 8:1 | 8:1 | 8:1 | 8:1 | 8:1 | 8:1 |
| Number of Channels | 8 channels | 8 channels | 8 channels | 8 channels | 8 channels | 8 channels |
| Select Inputs | A, B, and C | A, B, and C | A, B, and C | A, B, and C | A, B, and C | A, B, and C |
| Inhibit Input | Yes | Yes | Yes | Yes | Yes | Yes |
| Technology | CMOS | CMOS | CMOS | CMOS | CMOS | CMOS |
أبرز الفروقات
- Eight-channel single-ended routing with inhibit control (مقابلCD4052B)
- Logic-level conversion in the CD4051B family (مقابلCD4052B)
- Available manufacturer suffix options (مقابلCD74HC4051)
ملاحظات التصميم
Route the eight analog inputs and the common output as short, directly referenced traces on a continuous ground plane. Keep the mux output path short and place any downstream amplifier or converter input close to the device. Maintain a defined ground reference beneath the analog routing and avoid sharing long return paths with switching circuitry. The supplied data does not specify a package-specific recommended layout, so follow the manufacturer datasheet and application guidance for the final footprint.
Check leakage current, output resistance, charge injection, and switching transients against the impedance and accuracy of the selected channel. These characteristics are especially important when the source impedance is high or when the downstream ADC must settle shortly after the address changes. Use the manufacturer datasheet values for the selected supply, control state, temperature, and package. Do not estimate settling time from the 8:1 architecture alone.
Do not treat CD4051B as interchangeable with CD4052B or a 74HC4051 solely because all may be described as multiplexers. CD4052B is a differential 4-channel device according to the verified manufacturer description, while logic-family parts can have different voltage thresholds and pinouts. Confirm the exact package suffix, control truth table, inhibit polarity, analog limits, and downstream logic levels before replacing a part on an existing PCB.
معلومات الامتثال
Compliance information was not included in the supplied verified data. Do not infer RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status from the manufacturer name or family documentation.
