Texas Instruments CD4512BM

Overview

CD4512BM from Texas Instruments is a CMOS 8-channel analog multiplexer/demultiplexer with latched address inputs, operating over -55°C to +125°C, supporting ±5 V to ±20 V dual-supply or 10 V to 20 V single-supply operation, and featuring low on-resistance (125 Ω typical at V_DD − V_SS = 15 V), high off-isolation (>70 dB at 1 MHz), and TTL/CMOS-compatible control logic - used in precision data acquisition systems for channel selection prior to ADC sampling.

For engineers reviewing the CD4512BM datasheet, CD4512BM pinout, CD4512BM application, or CD4512BM equivalent, key selection criteria include supply voltage range compatibility, channel count, latch-enabled address decoding, on-resistance matching across channels, and SOIC-16 thermal and layout constraints in mixed-signal PCB designs.

Technical Context

The CD4512BM implements an 8:1 analog multiplexer with three binary address inputs (A0–A2) and a latch enable (LE) that freezes address selection independently of input transitions, enabling glitch-free channel switching synchronized to system timing. It uses standard CMOS transmission gate architecture with complementary P- and N-channel MOSFETs per switch path.

Its dual-supply capability allows true bipolar signal handling (±10 V input range with ±15 V supplies), while the latched address interface eliminates race conditions during dynamic address changes - critical in microcontroller-driven sensor arrays where address lines may toggle asynchronously with sample timing.

Key Specifications

Pinout & Package

CD4512BM is housed in a 16-pin SOIC (D) package, 7.5 mm × 5.0 mm body, 1.25 mm maximum height, with 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, and moisture sensitivity level 1 (unlimited floor life at ≤30°C/60% RH).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4512BM, CD4051BM96 offers cost savings but sacrifices timing robustness, while ADG708BRUZ delivers superior R_ON and speed at the expense of voltage range and temperature qualification - making CD4512BM uniquely suited for ruggedized, high-voltage, latch-synchronized analog routing.

Availability

CD4512BM is available at Aetrix Electronics and suitable for industrial data acquisition, automotive sensor consolidation, and programmable gain amplifier designs requiring stable component supply across extended temperature and high-voltage analog signal chains.

Supply support for CD4512BM 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 specializing in analog and embedded processing technologies, with leadership in precision analog, power management, and high-reliability ICs.

The CD4512BM belongs to TI's CD4000B-series CMOS logic family, designed specifically for robust, wide-supply-range analog switching in harsh-environment instrumentation and control systems.

FAQ

What is the maximum analog signal voltage range supported by the CD4512BM?

The CD4512BM supports analog input signals from V_SS to V_DD. With ±15 V dual supplies, it handles ±10 V signals; with 15 V single supply, it accommodates 0 V to 10 V. Exceeding V_SS or V_DD risks latch-up. The CD4512BM datasheet specifies absolute maximum ratings of V_DD − V_SS ≤ 20 V and input voltage within supply rails.

Does the CD4512BM require external pull-up resistors on its address or control pins?

No, the CD4512BM has CMOS-compatible inputs with high impedance and built-in ESD protection diodes. Address inputs A0–A2 and control pins LE and INH accept standard TTL or CMOS logic levels directly. External pull-ups are unnecessary unless system-level noise immunity or default-state assurance is required - the CD4512BM itself does not mandate them.

Can the CD4512BM be used in a single-supply configuration with a 3.3 V microcontroller interface?

The CD4512BM is not optimized for 3.3 V logic - its minimum recommended V_DD − V_SS is 10 V, and logic thresholds scale with supply. Driving LE or A0–A2 with 3.3 V signals while V_DD = 15 V may cause unreliable latching. For 3.3 V systems, consider level-shifting or selecting a modern low-voltage mux like the TMUX1108 - the CD4512BM requires ≥10 V total supply headroom.

What is the purpose of the INH (Inhibit) pin on the CD4512BM?

The INH pin is an active-high global disable that turns off all internal analog switches regardless of address or latch state. When INH = high, Z is disconnected from all I0–I7 channels, presenting high-impedance isolation. This allows safe reconfiguration, power sequencing, or fault shutdown without signal leakage - a key safety feature in the CD4512BM for fail-safe analog routing.

Is the CD4512BM pin-compatible with other members of the CD45xxB multiplexer family?

No - the CD4512BM (8:1 latched) has different pin functions than CD4511B (BCD-to-7-segment), CD4515B (4-bit latch), or CD4516B (presettable counter). Even within mux variants, CD4512BM differs from CD4514B (16:1) and CD4051B (8:1 unlatched) in pin assignment. Pinout verification must be performed per device; the CD4512BM SOIC-16 layout is unique to its latched 8-channel function.