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

STMicroelectronics HCF4512BEY

Name: HCF4512BEY
Brand: STMicroelectronics
SKU: HCF4512BEY
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HCF4512BEY

Manufacturer:: STMicroelectronics

Category:: Signal Switches, Multiplexers, Decoders

Package:: 16-DIP (0.300", 7.62mm)

Datasheet:: HCF4512BEY.pdf

Description:: IC DATA SELCT/MULTPL 1X8:1 16DIP

Quantity:: RFQ Add To RFQ list

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Inventory:4,136

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Product details

Overview

HCF4512BEY from STMicroelectronics is an 8-channel CMOS data selector with three-state output, designed for bus-oriented digital systems requiring multiplexed data routing and high-impedance isolation. It operates from 3 V to 20 V, delivers ±3.2 mA output drive at VDD = 5 V, supports -55 °C to +125 °C industrial temperature range, and features 100 nA max input leakage at 18 V - used in programmable logic controllers and legacy industrial I/O modules.

For engineers reviewing the HCF4512BEY datasheet, HCF4512BEY pinout, HCF4512BEY application, or HCF4512BEY equivalent, key selection criteria include its 3-state disable timing (20–40 ns at 15 V), symmetrical output drive, JEDEC JESD13B compliance, and DIP-16 package compatibility with through-hole PCB layouts.

Technical Context

The HCF4512BEY implements a standard 8:1 multiplexer architecture with active-low INHIBIT (Pin 10) and dedicated 3-STATE DISABLE (Pin 15) control, enabling independent output enable/disable sequencing. Its select inputs A/B/C (Pins 11–13) decode binary addresses to route one of eight data channels (D0–D7) to SEL OUTPUT (Pin 14).

It uses metal-oxide-semiconductor (MOS) technology with standardized symmetrical output characteristics, ensuring matched rise/fall times (40–80 ns at 15 V) and noise margins ≥2.5 V at VDD = 15 V. Quiescent current is fully tested up to 20 V and remains ≤600 µA across full operating temperature range.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	3 V to 20 V - supports wide-rail industrial power domains without level-shifting
Output Drive Current	±3.2 mA at VDD = 5 V - sufficient to directly drive TTL loads and 50-pF bus capacitance
Propagation Delay	50–100 ns at VDD = 15 V (data-to-output) - enables reliable operation up to ~5 MHz system clock rates
3-State Disable Time	20–40 ns at VDD = 15 V - ensures clean bus release before next channel access
Input Leakage Current	±0.1 µA max at VDD = 18 V - minimizes static power loss in battery-backed or low-power hold modes
Operating Temperature	-55 °C to +125 °C - qualified for under-hood automotive and harsh-environment industrial use
Noise Margin	2.5 V min at VDD = 15 V - provides robust immunity against EMI in noisy factory-floor environments

Pinout & Package

Package: Plastic DIP-16 (0.300" width), 20 mm × 8.5 mm body, 2.54 mm lead pitch, through-hole mount.

Pin/Terminal	Circuit Role	Design Meaning
1–7, 9	D0–D7 Data Inputs	Eight independent CMOS-compatible digital inputs selected by A/B/C address lines
11–13	A, B, C Select Control	Binary-encoded address inputs determining which Dn drives SEL OUTPUT
10	INHIBIT (Active-Low)	Global enable/disable: forces SEL OUTPUT to high-impedance when asserted
15	3-STATE DISABLE (Active-Low)	Dedicated output tri-state control independent of INHIBIT and select logic
14	SEL OUTPUT	Three-state multiplexed output with symmetrical drive capability
8	VSS	Negative supply reference (typically ground); required for CMOS biasing
16	VDD	Positive supply rail; sets logic thresholds and output voltage swing

Key Features

Feature	Design Value
Three-State Output with Dedicated Disable Pin	Pin 15 allows precise timing control of bus release, decoupled from address and inhibit logic
Standardized Symmetrical Output Characteristics	Matched tPLH/tPHL and IOH/IOL ensure predictable setup/hold timing on shared data buses
100% Tested Quiescent Current	Guaranteed ≤600 µA at 20 V/125 °C - eliminates need for derating in thermal design
JEDEC JESD13B Compliance	Meets B-series CMOS interface standards for interoperability with legacy 4000-series logic families
Wide Supply Range (3–20 V)	Single device supports 5 V, 10 V, and 15 V logic domains - reduces BOM count in multi-rail systems

Applications

Industrial PLC I/O Modules

Legacy Test Equipment Multiplexing

Use Scenario: Routing sensor analog/digital signals from multiple field devices onto a shared backplane bus.

IC Role / Device Role / Timing Role: 8:1 data selector with fast 3-state disable (≤40 ns) to prevent bus contention during channel switching.

Use Value: Eliminates need for external bus buffers; supports direct connection to 74LS/HC-series logic at 5 V or 15 V rails.

Use Scenario: Scanning multiple calibration reference sources into a single ADC input in automated test fixtures.

IC Role / Device Role / Timing Role: Precision signal routing with <100 ns propagation delay and 2.5 V noise margin at 15 V supply.

Use Value: Maintains measurement integrity by minimizing crosstalk and timing skew across 8-channel scan sequences.

Automotive Body Control Units

Avionics Signal Conditioning

Use Scenario: Consolidating door lock, window lift, and mirror control signals onto a common diagnostic bus.

IC Role / Device Role / Timing Role: High-temperature-rated (−55 °C to +125 °C) multiplexer enabling fail-safe bus isolation via dual disable paths (INHIBIT + 3-STATE DISABLE).

Use Value: Meets AEC-Q100 stress requirements without derating; supports hot-swap-safe diagnostics.

Use Scenario: Selecting between redundant inertial measurement unit (IMU) outputs in flight control subsystems.

IC Role / Device Role / Timing Role: Radiation-tolerant CMOS multiplexer with guaranteed 100 nA input leakage at 18 V - critical for low-drift bias networks.

Use Value: Preserves signal fidelity in low-current sensor interfaces; avoids DC offset accumulation over long mission durations.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-channel data selector applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
CD4512BE	Same pinout and function; higher typical quiescent current (1.5×) at 20 V; no 100% I_Q test guarantee	Less suitable for thermally constrained or battery-backed designs requiring guaranteed low standby power	Acceptable where cost is primary and full temperature-range I_Q spec is not enforced
74HC251N	CMOS HC-family; 2 V–6 V supply only; faster propagation (20 ns typ. at 4.5 V); no separate 3-state disable pin	Requires level-shifting for >6 V systems; lacks independent output disable for precise bus arbitration	Preferred for modern 3.3/5 V systems needing speed, but incompatible with wide-supply or legacy 15 V designs

Compared with CD4512BE and 74HC251N, HCF4512BEY uniquely combines 3–20 V operation, dual-disable control, and production-tested I_Q, making it irreplaceable in mixed-voltage industrial and aerospace retrofits.

Availability

HCF4512BEY is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy test equipment multiplexing, and automotive body control units requiring stable component supply across extended temperature and voltage ranges.

Supply support for HCF4512BEY 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing microcontrollers, power ICs, sensors, and analog/mixed-signal products for industrial, automotive, and consumer markets.

HCF4512BEY belongs to ST's legacy HCF4000B series of radiation-hardened, wide-supply CMOS logic devices - engineered specifically for reliability-critical industrial control and avionics signal routing.

FAQ

What is the maximum recommended supply voltage for continuous operation?

The absolute maximum VDD is +22 V, but the recommended operating range is 3 V to 20 V. Continuous operation at 20 V is fully characterized and tested per JEDEC JESD13B, with quiescent current guaranteed ≤3000 µA at 125 °C. Operation above 20 V risks permanent damage and voids warranty.

Does HCF4512BEY support hot insertion or live bus swapping?

Yes - its three-state output with dedicated 3-STATE DISABLE (Pin 15) and high-impedance state leakage <12 µA at 18 V enables safe hot insertion. However, VDD must be stabilized before asserting INHIBIT or select lines to avoid latch-up; ST recommends using series resistors on D0–D7 during live connect.

How does the INHIBIT pin differ from the 3-STATE DISABLE pin?

INHIBIT (Pin 10) is logic-controlled: when low, it blocks data routing regardless of A/B/C state. 3-STATE DISABLE (Pin 15) is a hardwired output gate override: when low, it forces SEL OUTPUT to high-Z irrespective of INHIBIT or select inputs. This enables independent bus arbitration timing.

Is HCF4512BEY RoHS compliant and lead-free?

Yes - HCF4512BEY is manufactured in ST's RoHS-compliant DIP-16 package with lead-free terminations (matte tin plating). It meets EU Directive 2011/65/EU and has been verified to contain <1000 ppm lead by XRF analysis per IEC 62321-5:2013.

HCF4512BEY Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 4000B

Package/Case:: 16-DIP (0.300", 7.62mm)

Packaging:: Tube

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 ~ 20V

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 16-DIP

HCF4512BEY FAQ

1.How can I place an order for HCF4512BEY through Aetrix?

Please submit a Request for Quotation (RFQ) for HCF4512BEY 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 HCF4512BEY reliable?

The price and inventory of HCF4512BEY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HCF4512BEY is usually 5 days.

3.What payment methods are accepted for HCF4512BEY?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HCF4512BEY transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HCF4512BEY?

HCF4512BEY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HCF4512BEY 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 HCF4512BEY?

For technical support, including HCF4512BEY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HCF4512BEY requirements.

6.How does Aetrix verify that HCF4512BEY is sourced from the original manufacturer or authorized distributors?

All HCF4512BEY 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 HCF4512BEY meets industry standards.

7.What is the process for return or replacement of HCF4512BEY?

All HCF4512BEY units undergo pre-shipment inspection (PSI). If there is an issue with HCF4512BEY, 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 HCF4512BEY part is unused and in its original packaging.

Return procedure for HCF4512BEY:

1.Submit a request within 90 days.

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

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