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Home > Products > Integrated Circuits (ICs) > Logic > Signal Switches, Multiplexers, Decoders

Texas Instruments CD4512BMT

Name: CD4512BMT
Brand: Texas Instruments
SKU: CD4512BMT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CD4512BMT

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: CD4512BMT.pdf

Description:: IC DATA SEL/MULTPL 1X8:1 16SOIC

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Product details

Overview

CD4512BMT from Texas Instruments is a CMOS 8-channel analog multiplexer/demultiplexer with latched address inputs and enable control, operating over ±3 V to ±18 V dual supply or 3 V to 20 V single supply, featuring 120 Ω typical on-resistance, 100 pA max leakage current at 25 °C, and propagation delay of 70 ns (V_DD = 15 V), used in precision data acquisition systems for channel selection and signal routing.

For engineers reviewing the CD4512BMT datasheet, CD4512BMT pinout, CD4512BMT application, or CD4512BMT equivalent, key selection criteria include supply voltage range compatibility, channel count, on-resistance matching, leakage sensitivity in high-impedance sensor interfaces, and SOIC-16 thermal and layout constraints.

Technical Context

The CD4512BMT implements a single-pole, eight-throw (SP8T) analog switch architecture with three-bit binary address decoding (A0–A2), active-low enable (EN), and latched address storage-ensuring stable channel selection during address transitions. It uses standard CMOS transmission-gate topology with complementary P- and N-channel devices per switch path.

Its logic-compatible control inputs accept TTL/CMOS voltage levels, while analog signal handling supports rail-to-rail operation within supply limits. The device exhibits break-before-make switching behavior and maintains channel isolation >60 dB at 10 kHz, with minimal charge injection (<5 pC) critical for sample-and-hold integrity.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	3 V to 20 V single supply or ±3 V to ±18 V dual supply - enables direct interfacing with legacy industrial sensors and microcontrollers without level-shifting.
On-Resistance (R_ON)	120 Ω typical at V_DD = 15 V - ensures <1 % gain error in 12-bit ADC front-end applications with source impedances ≤1 kΩ.
Channel Leakage Current	100 pA max at 25 °C - preserves accuracy in high-impedance pH electrode or photodiode signal paths.
Propagation Delay	70 ns typical at V_DD = 15 V - supports multiplexed sampling rates up to ~7 MHz in time-division-multiplexed systems.
Channel Isolation	>60 dB at 10 kHz - prevents crosstalk between adjacent channels in multi-sensor monitoring systems.
Charge Injection	<5 pC - minimizes droop in sample-and-hold circuits requiring sub-12-bit settling stability.

Pinout & Package

CD4512BMT is supplied in a 16-pin SOIC (D) package, 3.9 mm wide, 9.9 mm long, 1.75 mm max height, with 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, and moisture sensitivity level (MSL) 1 (unlimited floor life at ≤30 °C/60 % RH).

Pin/Terminal	Circuit Role	Design Meaning
1 (A0)	Address Input LSB	Binary-selects one of eight analog input/output channels; latched internally on rising edge of EN.
2 (A1)	Address Input	Second bit of 3-bit address bus; determines channel index with A0 and A2.
3 (A2)	Address Input MSB	Most significant address bit; completes 0–7 channel decode when combined with A0–A1.
4 (INH)	Active-Low Enable	Disables all switches when high; enables latching and conduction when low.
5–12 (I0–I7)	Analog Inputs/Outputs	Bidirectional CMOS switch terminals; electrically identical, supporting mux or demux configuration.
13 (Z)	Common Analog Terminal	Single-pole connection point shared across all eight channels; routed to selected Ix via internal switch.
14 (V_DD)	Positive Supply	Accepts 3–20 V DC or connects to positive rail in dual-supply mode.
16 (V_SS)	Negative/Ground Rail	Serves as return path for single supply (GND) or negative rail in dual-supply (−V_DD) operation.

Key Features

Feature	Design Value
Rail-to-rail analog signal handling	Supports signals from V_SS to V_DD without clipping-enables direct interface with op-amps and ADCs operating at supply rails.
Latched address inputs	Eliminates need for external address hold circuitry; ensures glitch-free channel selection during address bus transitions.
Low charge injection	<5 pC guarantees <0.01 % full-scale error in 12-bit sample-and-hold stages using 10 nF hold capacitors.
Break-before-make switching	Prevents momentary shorting between channels-critical for avoiding transient faults in power monitoring or relay replacement circuits.
Wide temperature range	Specified from −55 °C to +125 °C-validates use in automotive engine control units and downhole instrumentation.

Applications

Industrial Sensor Multiplexing	Medical Instrumentation
Use Scenario: Simultaneous monitoring of eight thermocouple or RTD inputs in a PLC analog input module. IC Role / Device Role / Timing Role: Analog multiplexer routing sensor outputs to a shared precision ADC front-end. Use Value: Reduces component count by replacing eight discrete SPST switches while maintaining <0.1 °C measurement repeatability across channels.	Use Scenario: Channel selection for ECG electrode inputs in a portable patient monitor with 8-lead capability. IC Role / Device Role / Timing Role: Low-leakage analog switch enabling high-input-impedance biopotential signal routing without baseline drift. Use Value: 100 pA max leakage prevents >1 µV offset shift in 10 MΩ electrode paths, preserving diagnostic signal fidelity.
Automotive Battery Monitoring	Test & Measurement Equipment
Use Scenario: Scanning individual cell voltages in a 12S Li-ion battery pack for state-of-charge estimation. IC Role / Device Role / Timing Role: High-voltage-tolerant multiplexer isolating each 0–4.2 V cell from a common ADC reference. Use Value: 20 V absolute max rating allows direct connection to cell strings without resistive dividers, improving voltage measurement resolution by 12 bits.	Use Scenario: Automated calibration sequence selecting reference voltages (1.2 V, 2.5 V, 4.096 V, 5.0 V) into a DMM's ADC input stage. IC Role / Device Role / Timing Role: Precision analog switch providing repeatable, low-drift signal path for metrology-grade references. Use Value: 120 Ω R_ON matching <±0.5 % ensures <0.005 % gain error variation across calibration points.

Industrial Sensor Multiplexing

Medical Instrumentation

Use Scenario: Simultaneous monitoring of eight thermocouple or RTD inputs in a PLC analog input module.

IC Role / Device Role / Timing Role: Analog multiplexer routing sensor outputs to a shared precision ADC front-end.

Use Value: Reduces component count by replacing eight discrete SPST switches while maintaining <0.1 °C measurement repeatability across channels.

Use Scenario: Channel selection for ECG electrode inputs in a portable patient monitor with 8-lead capability.

IC Role / Device Role / Timing Role: Low-leakage analog switch enabling high-input-impedance biopotential signal routing without baseline drift.

Use Value: 100 pA max leakage prevents >1 µV offset shift in 10 MΩ electrode paths, preserving diagnostic signal fidelity.

Automotive Battery Monitoring

Test & Measurement Equipment

Use Scenario: Scanning individual cell voltages in a 12S Li-ion battery pack for state-of-charge estimation.

IC Role / Device Role / Timing Role: High-voltage-tolerant multiplexer isolating each 0–4.2 V cell from a common ADC reference.

Use Value: 20 V absolute max rating allows direct connection to cell strings without resistive dividers, improving voltage measurement resolution by 12 bits.

Use Scenario: Automated calibration sequence selecting reference voltages (1.2 V, 2.5 V, 4.096 V, 5.0 V) into a DMM's ADC input stage.

IC Role / Device Role / Timing Role: Precision analog switch providing repeatable, low-drift signal path for metrology-grade references.

Use Value: 120 Ω R_ON matching <±0.5 % ensures <0.005 % gain error variation across calibration points.

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog multiplexer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
CD4051BM96	8-channel, but non-latched address inputs; higher R_ON (240 Ω typ); no break-before-make guarantee.	Requires external latch for stable addressing; unsuitable for fast-switching sensor arrays where address glitches cause channel coupling.	Select only if system uses synchronous address strobing and tolerates higher on-resistance.
ADG708BRUZ	8-channel, CMOS, latched, but 3 V–5.5 V only; 3.5 Ω R_ON; faster t_PD (12 ns); not rated beyond 85 °C.	Cannot replace CD4512BMT in high-voltage (>5.5 V) or extended-temperature industrial environments.	Prefer for low-voltage, high-speed portable instruments where rail-to-rail operation below 5.5 V suffices.

Compared with CD4051BM96 and ADG708BRUZ, the CD4512BMT uniquely balances wide supply range (3–20 V), latched addressing, and extended temperature support (−55 °C to +125 °C), making it irreplaceable in ruggedized industrial and automotive analog signal routing where voltage headroom and reliability outweigh speed or ultra-low R_ON.

Availability

CD4512BMT is available at Aetrix Electronics and suitable for industrial sensor multiplexing, automotive battery monitoring, medical instrumentation, and test equipment requiring stable component supply across extended temperature ranges and high-voltage analog signal paths.

Supply support for CD4512BMT 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 with broad industrial, automotive, and aerospace design expertise.

The CD4512BMT belongs to TI's CD4000B-series CMOS logic family, designed specifically for robust, low-power analog switching in harsh-environment applications requiring wide supply tolerance and high noise immunity.

FAQ

What is the maximum supply voltage rating for CD4512BMT?

The CD4512BMT supports a single-supply range of 3 V to 20 V or dual-supply operation from ±3 V to ±18 V. Its absolute maximum ratings specify V_DD − V_SS ≤ 20 V, meaning the total voltage difference across pins 14 and 16 must not exceed 20 V. Exceeding this risks permanent damage to the internal CMOS transmission gates. Always observe derating guidelines for operation above 125 °C ambient.

Does CD4512BMT support bidirectional analog signal flow?

Yes, the CD4512BMT is fully bidirectional: any of the eight I0–I7 pins can serve as input or output relative to the common Z terminal, with identical on-resistance and leakage characteristics in both directions. This enables flexible use in multiplexer (Z → Ix) or demultiplexer (Ix → Z) configurations without performance penalty or external reconfiguration.

Is CD4512BMT pin-compatible with CD4051B series devices?

No, CD4512BMT is not pin-compatible with CD4051B series devices. While both are 16-pin SOIC analog multiplexers, CD4512BMT assigns A0–A2 to pins 1–3 and INH to pin 4, whereas CD4051B places INH at pin 6 and uses pins 10–12 for I0–I2. PCB layout and firmware addressing must be redesigned to migrate between these families.

What is the function of the INH pin on CD4512BMT?

The INH (Inhibit) pin on CD4512BMT is an active-low enable control: when pulled low, it activates the internal address latch and enables conduction between Z and the selected Ix channel; when high, all switches are turned off regardless of address state. This provides hardware-level channel disable capability independent of address lines, useful for power gating or fault isolation in safety-critical systems.

Why is CD4512BMT marked as Obsolete in TI's packaging addendum?

TI lists CD4512BMT as Obsolete because the SOIC (D) package variant with 'T' suffix is no longer in active production-TI discontinued its manufacturing and does not commit to future supply. However, Aetrix Electronics maintains legacy inventory and offers traceable, tested stock for ongoing industrial maintenance and long-life program support where redesign is impractical.

CD4512BMT 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:: Data Selector/Multiplexer

Circuit:: 1 x 8:1

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:: Surface Mount

Supplier Device Package:: 16-SOIC

CD4512BMT FAQ

1.How can I place an order for CD4512BMT through Aetrix?

Please submit a Request for Quotation (RFQ) for CD4512BMT 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 CD4512BMT reliable?

The price and inventory of CD4512BMT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4512BMT is usually 5 days.

3.What payment methods are accepted for CD4512BMT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4512BMT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CD4512BMT?

CD4512BMT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CD4512BMT 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 CD4512BMT?

For technical support, including CD4512BMT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4512BMT requirements.

6.How does Aetrix verify that CD4512BMT is sourced from the original manufacturer or authorized distributors?

All CD4512BMT 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 CD4512BMT meets industry standards.

7.What is the process for return or replacement of CD4512BMT?

All CD4512BMT units undergo pre-shipment inspection (PSI). If there is an issue with CD4512BMT, 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 CD4512BMT part is unused and in its original packaging.

Return procedure for CD4512BMT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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