Texas Instruments CD4512BF3A

Overview

CD4512BF3A from Texas Instruments is a CMOS 8-channel analog multiplexer/demultiplexer with latched address inputs, operating over -55°C to +125°C, featuring 20V supply rating, low on-resistance (125 Ω typical at V_DD = 15 V), and TTL/CMOS-compatible control logic. It serves as a precision signal routing device in data acquisition systems requiring channel selection under high-temperature conditions.

For engineers reviewing the CD4512BF3A datasheet, CD4512BF3A pinout, CD4512BF3A application, or CD4512BF3A equivalent, key selection criteria include its hermetic ceramic DIP-16 package, SNPB lead finish, MIL-qualified thermal range, latch-enabled address decoding, and absence of internal ESD protection diodes-requiring external clamping in high-noise environments.

Technical Context

The CD4512BF3A implements a single-pole, eight-throw (SP8T) analog switch architecture with three address lines (A0–A2) and an active-high latch enable (LE). Signal paths support bidirectional analog or digital signals up to ±15 V peak, with channel-to-channel crosstalk below -50 dB at 1 MHz.

Its latched input structure eliminates address glitching during switching, and the device uses standard CMOS transmission-gate topology with complementary P- and N-channel MOSFETs per channel-ensuring symmetrical on-resistance and minimal charge injection (< 5 pC).

Key Specifications

Pinout & Package

Ceramic dual-in-line package (CDIP-J), 16-pin, hermetically sealed, with SNPB lead finish and no moisture sensitivity rating (MSL N/A). Pin 1 identified by index notch and corner cut.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4512BF3A, CD4051BE offers lower cost but sacrifices latch integrity and thermal robustness, while MAX4617CPD+ delivers superior R_ON yet requires additional logic and cannot replace 8:1 multiplexing functionality directly.

Availability

CD4512BF3A is available at Aetrix Electronics and suitable for high-reliability thermocouple DAQ systems, military avionics sensor hubs, and downhole oilfield instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for CD4512BF3A 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 power management technologies, with over 90 years of innovation in high-reliability components.

The CD4512B series belongs to TI's legacy CMOS logic family designed for industrial, aerospace, and defense applications demanding wide temperature operation, hermetic packaging, and latch-stable analog switching.

FAQ

What is the maximum signal voltage swing supported by the CD4512BF3A?

The CD4512BF3A supports analog signal voltages from V_EE to V_DD, with absolute maximum ratings of -0.5 V to V_DD + 0.5 V on all I/O pins. When operated with V_DD = 15 V and V_EE = 0 V, it handles 0–15 V unipolar signals; with V_EE = -5 V, it supports ±15 V bipolar swings. This capability makes CD4512BF3A suitable for conditioning sensor outputs in mixed-signal industrial systems.

Does the CD4512BF3A include built-in ESD protection diodes on its analog I/O pins?

No, the CD4512BF3A does not integrate ESD protection diodes on its analog I/O pins. Its datasheet specifies no internal clamp structures, requiring external TVS diodes or series resistors for IEC 61000-4-2 compliance. This design choice preserves low leakage (<100 nA) and high channel isolation, but places ESD hardening responsibility on the system designer - a key consideration when deploying CD4512BF3A in field-deployed instrumentation.

Can the CD4512BF3A operate with a single 5 V supply in a microcontroller-based system?

Yes, the CD4512BF3A operates with a single 5 V supply (V_DD = 5 V, V_EE = 0 V) and accepts TTL- and CMOS-level logic inputs. Its control pins (A0–A2, LE) are compatible with 3.3 V and 5 V microcontrollers without level shifters. However, analog signal range is limited to 0–5 V, and R_ON increases to ~300 Ω - a trade-off accepted in cost-sensitive CD4512BF3A implementations where precision is secondary to compatibility.

How does the latch enable (LE) function improve noise immunity in the CD4512BF3A?

The LE pin in CD4512BF3A captures and holds the A0–A2 address state on its rising edge, decoupling channel selection from address bus timing jitter or ground bounce. This prevents transient misrouting during microcontroller bus arbitration or interrupt service - a critical feature in electrically noisy industrial cabinets where CD4512BF3A is commonly deployed for sensor aggregation.

Is the CD4512BF3A RoHS compliant?

No, the CD4512BF3A uses SNPB (tin-lead) lead finish and is not RoHS compliant. Its packaging documentation explicitly lists "No" under RoHS status. This reflects its heritage as a military-qualified part (CD4512B-MIL lineage), where leaded finishes are retained for solder joint reliability in high-vibration, high-temperature deployments. Customers requiring RoHS compliance should evaluate alternatives like CD4512BM96 (NIPDAU finish, SOIC), though with different package and thermal specs.