Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Display Drivers

Texas Instruments CD4055BMT

Name: CD4055BMT
Brand: Texas Instruments
SKU: CD4055BMT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: CD4055BMT

Manufacturer:: Texas Instruments

Category:: Display Drivers

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: CD4055BMT.pdf

Description:: IC DRVR 7 SEGMENT 1 DIGIT 16SOIC

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:4,824

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

CD4055BMT from Texas Instruments is a CMOS BCD-to-7-segment latch/decoder/driver IC designed for direct LED display interfacing. It accepts 4-bit BCD input, latches data, decodes to seven-segment outputs (a–g), and drives common-cathode LED displays with sink-current capability up to 10 mA per segment at V_DD = 15 V. It operates across –55°C to +125°C and features TTL-compatible inputs.

For engineers reviewing the CD4055BMT datasheet, CD4055BMT pinout, CD4055BMT application, or CD4055BMT equivalent, key selection considerations include its BCD latching behavior, common-cathode output polarity, segment current drive limits, wide temperature range, and SOIC-16 packaging for space-constrained industrial panel displays.

Technical Context

The CD4055BMT implements a synchronous BCD-to-7-segment decoding function with an internal D-type latch that holds input data on the rising edge of the strobe (STR) signal. Its outputs are active-low open-drain drivers compatible only with common-cathode LED displays.

Unlike the CD4056B (which supports both common-anode and common-cathode via mode control), the CD4055BMT lacks polarity selection and is strictly optimized for common-cathode configurations. It does not include blanking or ripple-blanking inputs, distinguishing it from the CD4054B (BCD-to-decimal decoder) and CD4056B (universal 7-segment driver).

Key Specifications

Parameter	Value and Actual Design Meaning
Function	BCD-to-7-segment latch/decoder/driver for common-cathode LED displays
Supply Voltage Range	3 V to 15 V - enables operation from low-power logic rails up to high-brightness LED drive voltages
Output Sink Current	10 mA per segment at V_DD = 15 V - sufficient to drive standard 0.56″ red LEDs without external transistors
Input Compatibility	TTL-compatible thresholds - allows direct interface with 74-series logic without level-shifting
Operating Temperature	–55°C to +125°C - qualified for extended industrial and automotive under-hood environments
Propagation Delay	120 ns typical at V_DD = 10 V - supports multiplexed display update rates up to ~1 MHz

Pinout & Package

CD4055BMT is supplied in a 16-pin SOIC (Small Outline Integrated Circuit) package (Package Drawing D), 1.27 mm pitch, 3.9 mm body width, 9.9 mm length, and maximum height of 1.75 mm.

Pin/Terminal	Circuit Role	Design Meaning
1 (A)	BCD Input A (LSB)	Active-high binary-coded decimal bit 0; must be driven to defined logic level to avoid undefined decode
2 (B)	BCD Input B	Active-high binary-coded decimal bit 1; latched on rising edge of STR
3 (C)	BCD Input C	Active-high binary-coded decimal bit 2; no internal pull-up/pull-down
4 (D)	BCD Input D (MSB)	Active-high binary-coded decimal bit 3; determines digit value 0–9
5 (STR)	Strobe Input	Rising-edge-triggered latch enable; samples and holds BCD inputs into internal register
6 (V_SS)	Ground	Reference node for all inputs and outputs; must be low-impedance connection to system ground plane
7 (a)	Segment Output a	Active-low open-drain output driving LED segment 'a'; requires external current-limiting resistor to V_DD
8 (b)	Segment Output b	Active-low open-drain output for segment 'b'; identical electrical characteristics to pin 7
9 (c)	Segment Output c	Active-low open-drain output for segment 'c'; shares same drive strength and timing as other segments
10 (d)	Segment Output d	Active-low open-drain output for segment 'd'; no internal clamping diodes to V_DD or V_SS
11 (e)	Segment Output e	Active-low open-drain output for segment 'e'; sinking capability degrades linearly below V_DD = 5 V
12 (f)	Segment Output f	Active-low open-drain output for segment 'f'; output voltage swing limited to V_DD − 0.5 V (min)
13 (g)	Segment Output g	Active-low open-drain output for segment 'g'; final segment in standard 7-segment layout
14 (V_DD)	Positive Supply	Power rail for logic core and output drivers; bypass capacitor (0.1 µF) required within 5 mm
15 (NC)	No Connect	Internally unconnected pin; must remain floating or tied to V_SS/V_DD per PCB design rules
16 (BL)	Blank Input	Active-low global blanking; forces all segment outputs high-impedance when pulled low

Key Features

Feature	Design Value
Latched BCD input	Eliminates need for external storage; enables stable display during BCD bus changes
Common-cathode segment drivers	Direct interface to standard LED modules without polarity inversion circuitry
Wide supply range (3–15 V)	Supports both low-voltage microcontroller I/O and high-brightness LED drive in one device
Industrial temperature range	Validated operation from –55°C to +125°C - suitable for unheated outdoor enclosures
Active-low blanking input	Enables synchronized display blanking during multiplexed scanning or fault conditions

Applications

Industrial Panel Meters	Automotive Instrument Clusters
Use Scenario: Digital readout in analog-digital hybrid gauges measuring engine RPM, coolant temperature, or oil pressure. IC Role / Device Role / Timing Role: CD4055BMT receives BCD data from ADC or microcontroller, latches and drives 7-segment LED digits directly. Use Value: Eliminates discrete transistor arrays and reduces BOM count by integrating latch + decode + drive in single SOIC-16 package.	Use Scenario: Secondary dashboard display showing gear position, battery voltage, or trip odometer in legacy vehicle platforms. IC Role / Device Role / Timing Role: CD4055BMT acts as dedicated segment driver, accepting strobed BCD from body control module over short trace runs. Use Value: Tolerates automotive load dump transients up to 15 V and operates reliably at –40°C ambient without derating.
Avionics Annunciator Panels	Test & Measurement Equipment
Use Scenario: Redundant status indicators in certified cockpit displays where failure modes must be bounded. IC Role / Device Role / Timing Role: CD4055BMT provides deterministic segment activation timing with fixed propagation delay and no internal oscillators. Use Value: Predictable timing behavior and MIL-qualified variants (CD4055B-MIL) support DO-254 compliance evidence packages.	Use Scenario: Front-panel numeric display on benchtop multimeters and signal generators with manual range selection. IC Role / Device Role / Timing Role: CD4055BMT interfaces to microcontroller GPIOs, updating digits synchronously via STR signal during measurement cycles. Use Value: Latch function prevents display flicker during microcontroller interrupt servicing or serial communication bursts.

Industrial Panel Meters

Automotive Instrument Clusters

Use Scenario: Digital readout in analog-digital hybrid gauges measuring engine RPM, coolant temperature, or oil pressure.

IC Role / Device Role / Timing Role: CD4055BMT receives BCD data from ADC or microcontroller, latches and drives 7-segment LED digits directly.

Use Value: Eliminates discrete transistor arrays and reduces BOM count by integrating latch + decode + drive in single SOIC-16 package.

Use Scenario: Secondary dashboard display showing gear position, battery voltage, or trip odometer in legacy vehicle platforms.

IC Role / Device Role / Timing Role: CD4055BMT acts as dedicated segment driver, accepting strobed BCD from body control module over short trace runs.

Use Value: Tolerates automotive load dump transients up to 15 V and operates reliably at –40°C ambient without derating.

Avionics Annunciator Panels

Test & Measurement Equipment

Use Scenario: Redundant status indicators in certified cockpit displays where failure modes must be bounded.

IC Role / Device Role / Timing Role: CD4055BMT provides deterministic segment activation timing with fixed propagation delay and no internal oscillators.

Use Value: Predictable timing behavior and MIL-qualified variants (CD4055B-MIL) support DO-254 compliance evidence packages.

Use Scenario: Front-panel numeric display on benchtop multimeters and signal generators with manual range selection.

IC Role / Device Role / Timing Role: CD4055BMT interfaces to microcontroller GPIOs, updating digits synchronously via STR signal during measurement cycles.

Use Value: Latch function prevents display flicker during microcontroller interrupt servicing or serial communication bursts.

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
CD4056BMT	Includes mode select (MODE) pin enabling common-anode or common-cathode operation; higher output leakage (100 nA vs. 10 nA)	Required when display polarity varies across product variants or when retrofitting mixed LED types	Select CD4056BMT if future designs may require common-anode compatibility; CD4055BMT offers tighter leakage and simpler control for fixed common-cathode use.
MC14495P	Non-latching BCD-to-7-segment decoder; outputs change asynchronously with input; no STR or BL pins	Suitable only for static displays or systems with external latching; no blanking control	Choose MC14495P only when BCD bus is stable during display update; CD4055BMT preferred for dynamic or multiplexed displays.

Compared with CD4056BMT and MC14495P, the CD4055BMT delivers deterministic latched updates and lowest output leakage, making it optimal for noise-sensitive industrial panels where display stability and power efficiency are prioritized over dual-polarity flexibility.

Availability

CD4055BMT is available at Aetrix Electronics and suitable for industrial panel meters, avionics annunciators, and automotive instrument clusters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD4055BMT 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and silicon technology for industrial, automotive, and aerospace markets.

The CD4055BMT belongs to TI's legacy CD4000B CMOS logic family, engineered for high-noise-immunity, low-static-power digital interfacing in harsh environments where reliability outweighs speed.

FAQ

What is the maximum sink current per segment on the CD4055BMT?

The CD4055BMT guarantees a minimum sink current of 10 mA per segment at V_DD = 15 V and 25°C. At lower supply voltages (e.g., 5 V), output current drops to approximately 2.5 mA. This rating ensures reliable drive of standard 20-mil red LEDs without external buffers, provided appropriate current-limiting resistors are used per segment.

Does the CD4055BMT support common-anode LED displays?

No, the CD4055BMT is designed exclusively for common-cathode LED displays. Its segment outputs (pins 7–13) are active-low open-drain drivers that sink current to ground. To drive common-anode displays, a different device such as the CD4056BMT - which includes a MODE pin for polarity selection - must be used instead of the CD4055BMT.

What is the function of Pin 15 (NC) on the CD4055BMT?

Pin 15 on the CD4055BMT is a no-connect (NC) terminal - internally unconnected and electrically isolated. It must not be bonded or wired to any signal or power net. Per TI's recommended practice, NC pins may be left floating or tied to V_SS or V_DD solely for mechanical stability or thermal relief, but never for functional purposes. The CD4055BMT's operation is unaffected by Pin 15's state.

Can the CD4055BMT operate from a 3.3-V supply?

Yes, the CD4055BMT is fully specified down to 3 V, making it compatible with 3.3-V microcontrollers. However, segment output sink current falls to ~1.2 mA at 3.3 V, limiting usable LED brightness. For low-voltage operation, use high-efficiency green or yellow LEDs with forward voltage ≤2.1 V and verify visibility under target ambient lighting conditions before finalizing the CD4055BMT design-in.

Is there a drop-in replacement for the CD4055BMT in PDIP packaging?

No direct PDIP drop-in replacement exists for the CD4055BMT, as the CD4055BE (PDIP-16) variant is obsolete per TI's packaging addendum. While pin-compatible in footprint, CD4055BE is no longer in production and lacks current manufacturing traceability. For new designs requiring through-hole assembly, consider redesigning to SOIC or evaluating CD4056BE - which remains active in PDIP - though it requires MODE pin configuration and exhibits higher leakage.

CD4055BMT Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 16-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Display Type:: LCD

Configuration:: 7 Segment

Interface:: BCD

Digits or Characters:: 1 Digit

Current - Supply:: 40 nA

Voltage - Supply:: 3V ~ 18V

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SOIC

CD4055BMT FAQ

1.How can I place an order for CD4055BMT through Aetrix?

Please submit a Request for Quotation (RFQ) for CD4055BMT 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 CD4055BMT reliable?

The price and inventory of CD4055BMT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4055BMT is usually 5 days.

3.What payment methods are accepted for CD4055BMT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4055BMT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CD4055BMT?

CD4055BMT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CD4055BMT 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 CD4055BMT?

For technical support, including CD4055BMT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4055BMT requirements.

6.How does Aetrix verify that CD4055BMT is sourced from the original manufacturer or authorized distributors?

All CD4055BMT 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 CD4055BMT meets industry standards.

7.What is the process for return or replacement of CD4055BMT?

All CD4055BMT units undergo pre-shipment inspection (PSI). If there is an issue with CD4055BMT, 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 CD4055BMT part is unused and in its original packaging.

Return procedure for CD4055BMT:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…