Texas Instruments CD4512BNS

Overview

CD4512BNS from Texas Instruments is a CMOS 8-channel analog multiplexer/demultiplexer with latched address inputs and enable control, operating over -55°C to +125°C, supporting single-supply operation up to 20 V, and featuring low on-resistance (125 Ω typical at 15 V), high off-isolation (>70 dB at 1 MHz), and TTL/CMOS-compatible control logic. It serves as a precision signal routing switch in data acquisition systems requiring channel selection under microcontroller supervision.

For engineers reviewing the CD4512BNS datasheet, CD4512BNS pinout, CD4512BNS application, or CD4512BNS equivalent, key selection criteria include its 8:1 analog switching capability, latch-enabled address decoding, supply voltage range (3–20 V), guaranteed monotonicity, and SO package thermal performance for industrial sensor interface designs.

Technical Context

The CD4512BNS implements a dual-rail CMOS transmission gate architecture with buffered address latches and active-low enable, allowing stable channel selection independent of address input transitions. Its internal logic decodes three binary address lines (A0–A2) to select one of eight analog inputs/outputs while maintaining high channel-to-channel isolation.

It operates with rail-to-rail analog signal handling across the full supply range, exhibits no inherent signal inversion, and maintains sub-100 pA leakage current at 25°C - enabling use in high-impedance sensor front-ends and precision measurement paths without loading error.

Key Specifications

Pinout & Package

CD4512BNS is supplied in a 16-lead small-outline (SO) package per JEDEC MO-153, with 1.27 mm pitch, 1.2 mm max height, and gull-wing leads. The package is RoHS-compliant, green, and moisture-sensitive Level-1 (unlimited floor life).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4051BM96 and ADG708BRUZ, the CD4512BNS uniquely combines latched addressing, 20 V operation, and -55°C to +125°C qualification - making it the only option among the three for ruggedized, autonomous multiplexing in unattended remote instrumentation.

Availability

CD4512BNS is available at Aetrix Electronics and suitable for industrial data acquisition, automated test equipment, medical patient monitoring, and aerospace sensor interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD4512BNS 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The CD4512BNS belongs to TI's CD4000B-series CMOS logic family, designed specifically for high-reliability analog signal routing in harsh-environment systems where voltage flexibility, latch stability, and temperature resilience are mandatory.

FAQ

What is the maximum analog signal voltage range supported by the CD4512BNS?

The CD4512BNS supports analog signals from V_SS to V_DD, with V_DD rated from 3 V to 20 V. This rail-to-rail capability allows full-scale signal handling without clipping - for example, ±10 V differential inputs when V_DD = 20 V and V_SS = 0 V. The CD4512BNS maintains this specification across its full -55°C to +125°C operating range, making it suitable for high-voltage industrial transducer interfaces.

Does the CD4512BNS require external pull-up resistors on its address or enable pins?

No, the CD4512BNS features CMOS-compatible input structure with high-impedance, rail-referenced thresholds - inputs A0–A2 and INH have no internal pull-ups or pull-downs and must be actively driven to valid logic levels. Leaving them floating may cause metastability or unintended channel selection. The CD4512BNS datasheet specifies V_IL ≤ 0.5 V and V_IH ≥ V_DD – 1.5 V, so direct connection to microcontroller GPIOs is sufficient without external biasing.

Can the CD4512BNS be used bidirectionally for both multiplexing and demultiplexing?

Yes, the CD4512BNS is fully bidirectional: the common terminal (pin 13, Z) and channel terminals (pins 5–12) have identical on-resistance and capacitance characteristics. Signal flow direction depends solely on external circuit topology - for example, Z can serve as input with I0–I7 as outputs (demux mode), or Z as output with I0–I7 as inputs (mux mode). This symmetry is confirmed in the CD4512BNS functional diagram and verified in TI's application note SBFA005.

What is the recommended PCB layout practice for minimizing crosstalk in CD4512BNS-based designs?

To minimize crosstalk, route analog traces for I0–I7 and Z away from digital lines (A0–A2, INH), use ground guard rings around the CD4512BNS footprint, and place 100 nF ceramic decoupling capacitors within 3 mm of pins 14 (V_DD) and 16 (V_SS). The CD4512BNS SO package's 1.27 mm pitch supports tight spacing, but avoid running sensitive analog traces beneath the device body - instead, use dedicated inner-layer analog planes referenced to clean V_SS.

Is the CD4512BNS compatible with lead-free reflow profiles?

Yes, the CD4512BNS is RoHS-compliant and qualified for lead-free reflow per JEDEC J-STD-020. Its SO package (NS suffix) has Moisture Sensitivity Level 1 (unlimited floor life), and the peak reflow temperature is rated at 260°C. The CD4512BNS withstands standard Pb-free profiles including ramp-to-spike with 60-second dwell above 217°C, provided board-level thermal mass does not exceed IPC-7095 guidelines for SO-16 packages.