STMicroelectronics HCF40109BEY

Overview

HCF40109BEY from STMicroelectronics is a quad low-to-high voltage level shifter IC in 16-pin DIP package, enabling bidirectional level translation between independent VCC (up to 20 V) and VDD (up to 22 V) domains. It supports independent three-state outputs with separate enable controls per channel, operates with VCC exceeding VDD, and delivers symmetrical output characteristics with <100 nA input leakage at 18 V.

For engineers reviewing the HCF40109BEY datasheet, HCF40109BEY pinout, HCF40109BEY application, or HCF40109BEY equivalent, key selection criteria include supply sequence independence, dual-direction level shifting capability (L→H and H→L), guaranteed 300 ns propagation delay at 5 V → 10 V, and operation across -55 °C to +125 °C industrial temperature range.

Technical Context

HCF40109BEY implements four independent CMOS-based level-shifting channels, each with dedicated input (A–D), output (E–H), and enable (EN A–D) terminals. Its architecture allows unrestricted power-up sequencing: VCC, VDD, and input signals may be applied in any order without latch-up or damage.

The device supports both low-to-high (e.g., 5 V logic driving 15 V load) and high-to-low (e.g., 15 V signal translated down to 5 V domain) translation modes. Each output features standardized symmetrical drive strength (±1.5 mA min at VDD = 5 V), with quiescent current fully tested up to 20 V and specified from -55 °C to +125 °C.

Key Specifications

Pinout & Package

Package: 16-pin plastic DIP (Dual In-line Package), 0.3 inch body width, 2.54 mm pitch, JEDEC MS-001 compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad level-shifting applications.

Compared with CD40109BE and TXS0104E, HCF40109BEY uniquely supports unrestricted supply sequencing, operation up to 20 V, and full industrial temperature qualification - making it the only option for robust, high-voltage, mixed-supply system interfacing where reliability and timing predictability are critical.

Availability

HCF40109BEY is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and motor drive gate bias interfaces requiring stable component supply across extended temperature and mixed-voltage domains.

Supply support for HCF40109BEY 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, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

HCF40109BEY belongs to the HCF4000B series of radiation-hardened, high-voltage CMOS logic devices - engineered specifically for robust level translation in mixed-supply industrial control and automotive subsystems.

FAQ

Can HCF40109BEY operate with VCC higher than VDD?

Yes - the device explicitly permits VCC to exceed VDD, enabling high-to-low level shifting (e.g., 15 V input translated to 5 V output). This is confirmed in the functional description and absolute maximum ratings, where VCC and VDD are independently rated up to 20 V and 22 V respectively, with no interdependency constraints.

What is the maximum capacitive load supported at 15 V VDD?

HCF40109BEY is characterized with CL = 50 pF in dynamic testing, and its output drive capability (IOL = +3.6 mA min at VDD = 15 V) supports typical loads up to 100 pF while maintaining specified propagation delays and transition times. Layout-dependent parasitics should remain below 15 pF for worst-case timing compliance.

Is Pin 12 (NC) required to be left floating?

Yes - Pin 12 is internally unconnected per the mechanical and functional documentation. It must neither be tied to VDD, VSS, nor driven externally. PCB layout guidelines recommend leaving it unpopulated or optionally grounded only for mechanical stability, never for electrical function.

Does HCF40109BEY support hot-swap insertion?

Yes - due to its supply-sequence independence and absence of power-on reset requirements, HCF40109BEY can be inserted into a live backplane where VDD is already present, and VCC and inputs are applied later. This behavior is guaranteed by design and verified in JEDEC JESD13B compliance testing.