Texas Instruments CD40109BPWRE4

Overview

CD40109BPWRE4 from Texas Instruments is a quad low-to-high (and high-to-low) CMOS level translator IC with independent dual-supply operation, supporting VCC up to 18 V and VDD up to 15 V, input swing ≥0.7×VCC, and output voltage range of –0.5 V to VDD +0.5 V. It enables bidirectional level shifting in mixed-voltage digital systems such as 3.3 V/5 V interfacing between microcontrollers and legacy peripherals.

For engineers reviewing the CD40109BPWRE4 datasheet, CD40109BPWRE4 pinout, CD40109BPWRE4 application, or CD40109BPWRE4 equivalent, this page delivers verified supply sequencing freedom, unrestricted relative voltage magnitude support, and TSSOP-16 package-specific layout guidance for robust mixed-rail interface design.

Technical Context

The CD40109BPWRE4 implements four independent, non-inverting level-shifting channels using CMOS transistor pairs per channel, each with separate VCC (low-side) and VDD (high-side) supply pins. Input signals swing between VSS and ≥0.7×VCC, and outputs swing rail-to-rail from –0.5 V to VDD +0.5 V.

No power-up sequencing constraints exist: VCC, VDD, and inputs may be applied in any order. When VCC > VDD, the device operates as a high-to-low shifter-confirmed by functional specification in SCHS099B. All channels share common VSS but have isolated VCC/VDD domains.

Key Specifications

Pinout & Package

TSSOP-16 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm lead pitch, 1.2 mm max height, exposed pad not present, pin 1 marked by index area per JEDEC MO-153.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar level translation applications.

Compared with SN74LVC4245APWR and TXS0104EPWR, the CD40109BPWRE4 uniquely supports arbitrary VCC/VDD ratios, eliminates direction-control logic, guarantees –0.5 V to VDD +0.5 V output compliance, and maintains full functionality across –55 °C to +125 °C - making it the only option for high-reliability, wide-voltage, sequence-agnostic level translation.

Availability

CD40109BPWRE4 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and medical diagnostic equipment requiring stable component supply across extended temperature and mixed-voltage environments.

Supply support for CD40109BPWRE4 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 logic solutions, with over 90 years of innovation in high-reliability components.

The CD40109B series was designed specifically for robust, sequence-independent voltage translation in harsh industrial and automotive environments - emphasizing supply flexibility, rail-to-rail output fidelity, and extended temperature resilience.

FAQ

What is the maximum allowable voltage difference between VCC and VDD for CD40109BPWRE4?

The CD40109BPWRE4 permits any voltage difference between VCC and VDD as long as both remain within their respective absolute maximum ratings: VCC ≤ 18 V and VDD ≤ 15 V. No functional limitation exists on Δ(VCC − VDD); the device operates correctly whether VCC exceeds VDD (enabling high-to-low translation) or vice versa. This is explicitly confirmed in the SCHS099B datasheet section on supply voltage relationships.

Does CD40109BPWRE4 require external pull-up or pull-down resistors on its inputs or outputs?

No, the CD40109BPWRE4 does not require external pull-up or pull-down resistors. Its CMOS inputs have high impedance and negligible leakage, and its outputs are actively driven rail-to-rail (–0.5 V to VDD +0.5 V). External resistors are unnecessary unless needed for specific system-level noise immunity or bus-termination requirements unrelated to the CD40109BPWRE4's internal operation.

Can CD40109BPWRE4 translate signals from 15 V logic down to 3.3 V logic reliably?

Yes, CD40109BPWRE4 can reliably translate 15 V logic down to 3.3 V logic when configured in high-to-low mode (VCC = 3.3 V, VDD = 15 V). The device accepts inputs up to VDD and drives outputs referenced to VCC. Input threshold remains ≥0.7×VCC (≥2.31 V), ensuring clean switching with 15 V inputs via internal clamping and level-sensing circuitry - fully validated in the CD40109B datasheet.

Is CD40109BPWRE4 pin-compatible with other CD40109B variants like CD40109BNSR or CD40109BE?

No, CD40109BPWRE4 is not pin-compatible with CD40109BNSR (SOP-16) or CD40109BE (PDIP-16), despite identical electrical functionality and pin numbering. The TSSOP-16 (PW) package has different lead pitch (0.65 mm), body dimensions (4.4 mm × 5.0 mm), and thermal pad configuration. PCB layout must be redesigned for mechanical fit and soldering reliability - no direct PCB replacement is possible.

What is the recommended decoupling strategy for CD40109BPWRE4 in high-noise industrial applications?

For high-noise industrial use, place a 100 nF X7R ceramic capacitor between VCC and VSS, and another 100 nF capacitor between VDD and VSS, each located ≤3 mm from the respective supply pins. Add a 4.7 µF tantalum or polymer capacitor near the device for bulk filtering. Ensure VSS return paths are low-inductance and avoid shared traces between VCC and VDD grounds to prevent cross-domain noise coupling in the CD40109BPWRE4.