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Texas Instruments CD40109BF3A
- Part No.:
- CD40109BF3A
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
CD40109BF3A.pdf
- Description:
- CMOS QUAD LOW-TO-HIGH VOLTAGE LE
- Quantity:
- Payment:
- Shipping:
Inventory:4,767
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Product details
Overview
CD40109BF3A from Texas Instruments is a quad low-to-high (and high-to-low) CMOS level-shifting buffer with independent VCC and VDD supplies, supporting bidirectional voltage translation across 3 V–15 V logic domains, featuring unrestricted power-up sequencing and input swing down to 0.7×VCC - used in mixed-voltage industrial control interfaces.
For engineers reviewing the CD40109BF3A datasheet, CD40109BF3A pinout, CD40109BF3A application, or CD40109BF3A equivalent, key selection considerations include supply sequence independence, dual-rail operation (VCC > VDD or VDD > VCC), output voltage range (–0.5 V to VDD + 0.5 V), and ceramic DIP-16 packaging for high-reliability legacy systems.
Technical Context
The CD40109BF3A implements four independent level-shifting channels using buffered CMOS transmission gates with separate VCC (low-voltage logic) and VDD (high-voltage logic) rails. Each channel accepts inputs referenced to VSS and outputs referenced to VDD, enabling translation without bootstrapping or external biasing.
No power-supply sequencing constraints apply: VCC, VDD, and input signals may be applied in any order. Input signal amplitude must swing between VSS and ≥0.7×VCC; VCC may exceed VDD, permitting high-to-low shifting mode, and inputs may exceed both VCC and VDD within absolute maximum ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range (VCC) | 3 V to 15 V - supports 3.3 V, 5 V, and 12 V low-side logic domains. |
| Supply Voltage Range (VDD) | 3 V to 15 V - independently configurable high-side rail, compatible with TTL, CMOS, or discrete logic levels. |
| Output Voltage Range | –0.5 V to VDD + 0.5 V - enables robust interfacing with downstream devices tolerant of slight overvoltage/undervoltage. |
| Input Logic Threshold | ≥0.7 × VCC - ensures reliable recognition of low-voltage logic HIGH even under marginal VCC conditions. |
| Operating Temperature | –55 °C to +125 °C - qualified for extended industrial and military-grade environments. |
| Package Type | Ceramic Dual-In-Line Package (CDIP), 16-pin - hermetically sealed, moisture-resistant, and suitable for high-reliability aerospace and defense applications. |
Pinout & Package
Ceramic Dual-In-Line Package (CDIP), 16-pin, with 0.3-inch body width, 0.1-inch lead pitch, and SNPB (tin-lead) terminations. Hermetic seal and MIL-STD-883 compliance support long-term reliability in harsh environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 7 | Input A1–A4 | Low-voltage logic inputs referenced to VSS and VCC; accept 0.7×VCC threshold-compatible signals. |
| 2, 4, 6, 8 | Output Y1–Y4 | Level-shifted outputs referenced to VDD; swing from –0.5 V to VDD + 0.5 V for wide interface margin. |
| 9 | VSS | Common ground reference for all inputs and internal circuitry. |
| 10 | VDD | High-voltage supply rail (3–15 V); defines output logic HIGH level and output drive capability. |
| 11 | VCC | Low-voltage supply rail (3–15 V); sets input logic thresholds and internal biasing - independent of VDD. |
| 12–16 | No Connect / Reserved | Unused pins; left unconnected per TI datasheet - no internal connection or function. |
Key Features
| Feature | Design Value |
|---|---|
| Unrestricted Power-Up Sequencing | VCC, VDD, and input signals may be applied in any order - eliminates need for power-supply supervisors or sequencing ICs. |
| Bidirectional Level Translation | Supports both low-to-high (VCC < VDD) and high-to-low (VCC > VDD) modes - single device replaces two dedicated translators. |
| Wide Supply Flexibility | VCC and VDD independently set from 3 V to 15 V - accommodates legacy 5 V/12 V systems and modern 3.3 V/5 V hybrids. |
| Robust Output Drive | Output swing extends ±0.5 V beyond VDD/VSS rails - improves noise immunity when driving capacitive or mismatched loads. |
| MIL-Grade Packaging Option | F3A suffix denotes ceramic DIP package with SNPB leads and –55 °C to +125 °C rating - compliant with MIL-PRF-38535 Class K. |
Applications
| Industrial PLC I/O Interface | Aerospace Avionics Data Bus |
|---|---|
|
Use Scenario: Interfacing 3.3 V microcontroller GPIOs to 12 V field actuators and sensors in programmable logic controllers. IC Role / Device Role / Timing Role: Level-shifting buffer translating control signals between isolated voltage domains while maintaining timing integrity and noise margin. Use Value: Eliminates external pull-ups, level-shifter ICs, or discrete transistor arrays - reduces BOM count and PCB area in space-constrained DIN-rail modules. |
Use Scenario: Bridging 5 V ARINC 429 transmitter logic to 12 V analog conditioning circuitry in flight control computers. IC Role / Device Role / Timing Role: Bidirectional voltage translator ensuring signal fidelity across mixed-supply avionics subsystems without introducing propagation delay skew. Use Value: Ceramic DIP packaging and –55 °C to +125 °C operation meet DO-160E environmental stress requirements for airborne equipment. |
| Military Radio Baseband Interface | Legacy Test Equipment Signal Conditioning |
|
Use Scenario: Coupling 3 V FPGA I/O banks to 5 V or 12 V RF front-end control lines in SDR transceivers operating under MIL-STD-810H conditions. IC Role / Device Role / Timing Role: Isolated logic-level translator enabling safe, glitch-free communication between digital baseband and high-voltage RF subsystems. Use Value: Unrestricted supply sequencing prevents latch-up during cold-start or brownout recovery - critical for mission-critical comms hardware. |
Use Scenario: Retrofitting aging 15 V TTL-based automated test equipment with modern 3.3 V pattern generators and logic analyzers. IC Role / Device Role / Timing Role: Voltage-domain bridge preserving signal edge rates and DC logic compatibility across decades-old instrumentation platforms. Use Value: F3A ceramic package ensures long-term stability and solder-joint reliability in high-cycle thermal environments typical of production test labs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar level-shifting applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD40109BE | Plastic DIP-16 package (PDIP), NIPDAU finish, RoHS-compliant, same electrical specs. | Limited to commercial/industrial temp range (–40 °C to +85 °C); not rated for extended temperature or hermetic sealing. | Select CD40109BE only for cost-sensitive, non-mission-critical applications where plastic packaging suffices. |
| SN74LVC4245APWR | 8-bit bidirectional translator, 1.65–5.5 V rails, TSSOP-24, auto-direction sensing, lower propagation delay (3.5 ns). | Designed for high-speed digital buses (e.g., I²C, SPI); lacks extended temperature and hermetic packaging. | Choose SN74LVC4245APWR for high-density, high-speed digital interfaces; CD40109BF3A remains preferred for ruggedized, wide-voltage, or legacy-compatible designs. |
Compared with CD40109BE and SN74LVC4245APWR, the CD40109BF3A uniquely combines ceramic hermetic packaging, –55 °C to +125 °C operation, unrestricted supply sequencing, and true bidirectional voltage translation across 3–15 V rails - making it irreplaceable in aerospace, defense, and long-lifecycle industrial systems.
Availability
CD40109BF3A is available at Aetrix Electronics and suitable for industrial PLC I/O interfaces, aerospace avionics data buses, and military radio baseband systems requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for CD40109BF3A 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 CD40109BF3A belongs to TI's legacy CMOS logic family, designed specifically for robust voltage-level translation in mixed-supply systems where power sequencing control, wide voltage tolerance, and long-term reliability are mandatory.
FAQ
What is the primary function of the CD40109BF3A?
The CD40109BF3A is a quad CMOS level-shifting buffer that translates logic signals between two independent voltage domains (VCC and VDD), supporting both low-to-high and high-to-low translation. Its core function is to enable interoperability between 3 V–15 V logic families without requiring strict power-up sequencing - a capability confirmed in the Harris/TI SCHS099B datasheet. The CD40109BF3A achieves this using independent supply rails and input thresholds tied to VCC.
Does the CD40109BF3A require specific power-supply sequencing?
No - the CD40109BF3A explicitly permits arbitrary application order of VCC, VDD, and input signals, as stated in the SCHS099B datasheet. This eliminates dependency on power-supply supervisors or sequencing circuits. The CD40109BF3A remains functional and latch-up free regardless of whether VCC powers up before VDD, after VDD, or simultaneously - a key differentiator from earlier level shifters.
What is the meaning of the "F3A" suffix in CD40109BF3A?
The "F3A" suffix identifies the CD40109BF3A as a ceramic dual-in-line package (CDIP) variant with tin-lead (SNPB) leads, conforming to MIL-PRF-38535 Class K reliability standards. Per TI's packaging addendum, F3A denotes a 16-pin hermetic ceramic DIP supplied in tubes of 25 units, rated for –55 °C to +125 °C operation - distinguishing it from plastic (E), SOIC (NSR), or TSSOP (PW) variants.
Can the CD40109BF3A translate signals when VCC exceeds VDD?
Yes - the CD40109BF3A operates as a high-to-low level shifter when VCC > VDD, as documented in the SCHS099B datasheet. In this mode, inputs referenced to the higher VCC rail are translated to outputs swinging between VSS and VDD. This bidirectional flexibility allows one CD40109BF3A to replace separate low-to-high and high-to-low translators in hybrid voltage systems.
What are the absolute maximum ratings for input voltage on the CD40109BF3A?
The CD40109BF3A allows input signals to exceed both VCC and VDD, provided they remain within the device's absolute maximum ratings: –0.5 V to VDD + 0.5 V for outputs, and –0.5 V to VDD + 0.5 V for inputs (per TI's absolute maximum ratings table). Critically, inputs must swing between VSS and at least 0.7 × VCC to guarantee logic recognition - a requirement verified in the functional description of the CD40109BF3A datasheet.
CD40109BF3A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 4000B
- Package/Case:
- Packaging:
- Tube
- Product Status:
- Active
- Translator Type:
- Voltage Level
- Channel Type:
- Unidirectional
- Number of Circuits:
- 4
- Channels per Circuit:
- -
- Voltage - VCCA:
- 3 V ~ 18 V
- Voltage - VCCB:
- 3 V ~ 18 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Tri-State
- Data Rate:
- -
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-CDIP (0.300", 7.62mm)
CD40109BF3A FAQ
1.How can I place an order for CD40109BF3A through Aetrix?
Please submit a Request for Quotation (RFQ) for CD40109BF3A 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 CD40109BF3A reliable?
The price and inventory of CD40109BF3A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD40109BF3A is usually 5 days.
3.What payment methods are accepted for CD40109BF3A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD40109BF3A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD40109BF3A?
CD40109BF3A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD40109BF3A 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 CD40109BF3A?
For technical support, including CD40109BF3A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD40109BF3A requirements.
6.How does Aetrix verify that CD40109BF3A is sourced from the original manufacturer or authorized distributors?
All CD40109BF3A 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 CD40109BF3A meets industry standards.
7.What is the process for return or replacement of CD40109BF3A?
All CD40109BF3A units undergo pre-shipment inspection (PSI). If there is an issue with CD40109BF3A, 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 CD40109BF3A part is unused and in its original packaging.
Return procedure for CD40109BF3A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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