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Texas Instruments CD4056BF3A
- Part No.:
- CD4056BF3A
- Manufacturer:
- Texas Instruments
- Category:
- Display Drivers
- Package:
- 16-CDIP (0.300", 7.62mm)
- Datasheet:
-
CD4056BF3A.pdf
- Description:
- CMOS BCD TO 7-SEGMENT LCD DECODE
- Quantity:
- Payment:
- Shipping:
Inventory:2,271
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Product details
Overview
CD4056BF3A from Texas Instruments is a CMOS BCD-to-7-segment latch/decoder/driver IC designed for direct LED display interfacing. It features latched BCD input, active-low segment outputs, 15 V maximum supply voltage, -55°C to +125°C operating temperature range, and ceramic dual-in-line (CDIP) package with tin-lead (SNPB) finish.
For engineers reviewing the CD4056BF3A datasheet, CD4056BF3A pinout, CD4056BF3A application, or CD4056BF3A equivalent, this device is selected for high-reliability industrial panel meters, military-grade instrumentation displays, and legacy aerospace systems requiring hermetic packaging and extended temperature operation.
Technical Context
The CD4056BF3A integrates a 4-bit BCD latch, decoder logic, and seven high-current open-drain N-channel drivers in a single monolithic CMOS structure. Its segment outputs sink up to 1.5 mA per segment at VDD = 15 V, enabling direct drive of common-anode LED displays without external transistors.
Input latching occurs on the rising edge of the STROBE signal, isolating the decoder from input changes during display update. The BLANK input provides active-low blanking control independent of latched data, supporting multiplexed display architectures with precise timing control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | CMOS - ensures low static power consumption and high noise immunity in noisy industrial environments |
| Supply Voltage Range | 3 V to 15 V - supports wide-range battery and rail-flexible systems without level-shifting |
| Output Type | Open-drain N-channel - enables direct connection to common-anode LEDs with external pull-up resistors |
| Segment Drive Current | 1.5 mA min per output at VDD = 15 V - sufficient for standard LED segments without external drivers |
| Operating Temperature | -55°C to +125°C - qualified for military, avionics, and downhole instrumentation applications |
| Package Type | Ceramic DIP (CDIP), 16-pin - hermetic seal provides moisture resistance and long-term reliability under thermal cycling |
| Lead Finish | SnPb (SNPB) - compatible with legacy soldering processes and exempt from RoHS for military use |
Pinout & Package
CD4056BF3A is housed in a 16-pin ceramic dual-in-line package (CDIP, suffix F3A) with 0.3-inch body width and 0.1-inch lead pitch. The package is hermetically sealed and rated for harsh-environment operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A) | BCD Input A (LSB) | Active-high latched BCD bit; must be stable before STROBE rising edge |
| 2 (B) | BCD Input B | Active-high latched BCD bit; part of 4-bit binary-coded decimal word |
| 3 (C) | BCD Input C | Active-high latched BCD bit; determines decoded segment pattern |
| 4 (D) | BCD Input D (MSB) | Active-high latched BCD bit; completes 4-bit input for digits 0–9 |
| 5 (BLANK) | Active-Low Blank Control | Forces all segment outputs high (off) when logic low; overrides latched data |
| 6 (STROBE) | Latch Enable | Rising-edge triggered; captures current BCD inputs into internal latch |
| 7 (VSS) | Ground | Reference for all logic and output circuits; requires low-impedance connection |
| 8 (a) | Segment a Output | Open-drain N-channel driver for top horizontal LED segment |
| 9 (b) | Segment b Output | Open-drain N-channel driver for upper-right vertical LED segment |
| 10 (c) | Segment c Output | Open-drain N-channel driver for lower-right vertical LED segment |
| 11 (d) | Segment d Output | Open-drain N-channel driver for bottom horizontal LED segment |
| 12 (e) | Segment e Output | Open-drain N-channel driver for lower-left vertical LED segment |
| 13 (f) | Segment f Output | Open-drain N-channel driver for upper-left vertical LED segment |
| 14 (g) | Segment g Output | Open-drain N-channel driver for middle horizontal LED segment |
| 15 (VDD) | Positive Supply | CMOS supply rail; supports 3–15 V; decoupling capacitor required near pin |
| 16 (TEST) | Test Pin | Internally connected to substrate; must be tied to VSS or left unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Latched BCD input | Eliminates need for external latches in multiplexed display systems; prevents ghosting during digit updates |
| Active-low blanking | Enables synchronized blanking across multiple CD4056BF3A devices without additional logic |
| Hermetic CDIP package | Guarantees long-term reliability in high-humidity, high-vibration, or vacuum environments |
| Wide supply range (3–15 V) | Permits direct interface with TTL, CMOS, and mixed-voltage systems without regulators |
| Open-drain segment outputs | Allows flexible current limiting via external resistors and compatibility with diverse LED forward voltages |
Applications
| Avionics Panel Displays | Military Test Equipment |
|---|---|
Use Scenario: Analog-to-digital conversion readouts in cockpit instrumentation with EMI-hardened layout. IC Role / Device Role / Timing Role: BCD-to-7-segment driver converting ADC output to visible numeric display; latched input synchronizes with system sampling clock. Use Value: Hermetic CDIP packaging ensures zero moisture ingress over 20+ year service life in pressurized aircraft bays. | Use Scenario: Front-panel digital readouts on portable field-deployable signal analyzers and power meters. IC Role / Device Role / Timing Role: Display interface IC accepting BCD from microcontroller and driving high-brightness LEDs under variable ambient light. Use Value: -55°C to +125°C rating allows uninterrupted operation during desert or arctic field deployments. |
| Downhole Oilfield Sensors | Industrial Programmable Logic Controllers |
Use Scenario: Real-time pressure and temperature readouts inside drill-string telemetry modules exposed to >150°C wellbore environments. IC Role / Device Role / Timing Role: Latched decoder driving segmented displays in high-temperature ASIC subsystems with minimal external components. Use Value: Ceramic DIP construction withstands thermal shock during rapid surface-to-wellbore transitions without delamination. | Use Scenario: Operator interface modules in factory automation HMIs where display reliability impacts production uptime. IC Role / Device Role / Timing Role: Segment driver receiving BCD from PLC CPU over parallel bus; blanking controlled by watchdog timer for fail-safe display off. Use Value: SnPb lead finish ensures compatibility with legacy reflow profiles used in industrial PCB assembly lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar BCD-to-7-segment driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4056BE | Plastic DIP (PDIP) package, RoHS-compliant NiPdAu finish, same electrical specs | Limited to commercial/military-derated environments; not hermetic; max 125°C only | Select CD4056BE only for cost-sensitive non-military applications where humidity and long-term seal integrity are not critical |
| MC14495P | Pin-compatible but TTL-input logic; requires 5 V supply only; higher drive current (2.5 mA) | Designed for 5 V-only systems; lacks wide-VDD flexibility and extended temperature range | Choose MC14495P only when interfacing directly with 5 V TTL logic and higher segment brightness is required |
Compared with CD4056BE and MC14495P, the CD4056BF3A uniquely combines hermetic sealing, SnPb leads, and full -55°C to +125°C operation-making it irreplaceable in certified military, avionics, and oilfield electronics where environmental qualification is mandatory.
Availability
CD4056BF3A is available at Aetrix Electronics and suitable for avionics panel displays, military test equipment, and downhole oilfield sensors requiring stable component supply across extended product lifecycles.
Supply support for CD4056BF3A 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 delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The CD4056BF3A belongs to TI's legacy CMOS logic family, engineered specifically for high-reliability display interface applications in defense, aerospace, and energy exploration systems.
FAQ
What is the maximum supply voltage rating for CD4056BF3A?
The CD4056BF3A supports a maximum supply voltage of 15 V, with guaranteed operation from 3 V to 15 V. This wide range allows direct integration into both low-power battery systems and high-voltage industrial rails without external regulation. The CD4056BF3A maintains correct decoding and output drive capability across this entire span, as verified in the Harris Semiconductor SCHS048C datasheet.
Does CD4056BF3A require external current-limiting resistors for LED segments?
Yes, CD4056BF3A requires external current-limiting resistors on each segment output because its open-drain N-channel outputs sink current but do not regulate it. Resistor values are calculated based on LED forward voltage and desired segment current (e.g., 1.5 mA typical at VDD = 15 V). This design gives full brightness control and ensures safe operation across varying LED characteristics in the CD4056BF3A application.
Is CD4056BF3A pin-compatible with CD4056BE?
Yes, CD4056BF3A is pin-compatible with CD4056BE - both share identical 16-pin DIP pinout, function mapping, and electrical timing. However, CD4056BF3A uses a hermetic ceramic package with SnPb leads, while CD4056BE uses plastic DIP with RoHS-compliant finish. The CD4056BF3A retains full functional equivalence but adds environmental ruggedness not present in CD4056BE.
What is the purpose of the TEST pin (Pin 16) on CD4056BF3A?
Pin 16 (TEST) on CD4056BF3A is an internal substrate connection with no user-accessible function. Per the official TI datasheet, it must be either tied to VSS or left unconnected - floating is not recommended. This pin serves internal wafer-level test purposes only and has no effect on normal CD4056BF3A operation in circuit.
Can CD4056BF3A drive common-cathode LED displays?
No, CD4056BF3A cannot directly drive common-cathode LED displays because its segment outputs are open-drain N-channel sinks designed for common-anode configurations. To use with common-cathode displays, external PNP transistors or logic inverters would be required - defeating the integrated driver advantage. The CD4056BF3A is optimized exclusively for common-anode LED interfacing per its datasheet specification.
CD4056BF3A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Display Type:
- LCD
- Configuration:
- 7 Segment
- Interface:
- BCD
- Digits or Characters:
- -
- Current - Supply:
- 80 nA
- Voltage - Supply:
- 3V ~ 18V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-CDIP
CD4056BF3A FAQ
1.How can I place an order for CD4056BF3A through Aetrix?
Please submit a Request for Quotation (RFQ) for CD4056BF3A 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 CD4056BF3A reliable?
The price and inventory of CD4056BF3A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4056BF3A is usually 5 days.
3.What payment methods are accepted for CD4056BF3A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4056BF3A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD4056BF3A?
CD4056BF3A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD4056BF3A 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 CD4056BF3A?
For technical support, including CD4056BF3A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4056BF3A requirements.
6.How does Aetrix verify that CD4056BF3A is sourced from the original manufacturer or authorized distributors?
All CD4056BF3A 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 CD4056BF3A meets industry standards.
7.What is the process for return or replacement of CD4056BF3A?
All CD4056BF3A units undergo pre-shipment inspection (PSI). If there is an issue with CD4056BF3A, 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 CD4056BF3A part is unused and in its original packaging.
Return procedure for CD4056BF3A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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