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

Texas Instruments SN74LS247D

Name: SN74LS247D
Brand: Texas Instruments
SKU: SN74LS247D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LS247D

Manufacturer:: Texas Instruments

Category:: Display Drivers

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

Datasheet:: SN74LS247D.pdf

Description:: IC DRVR 7 SEGMENT 16SOIC

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Product details

Overview

SN74LS247D from Texas Instruments is a 7-segment BCD-to-7-segment decoder/driver IC designed for direct interface with common-anode LED displays. It features active-low outputs, open-collector drivers capable of sinking up to 40 mA per segment, TTL-compatible inputs, and built-in lamp test and blanking functions. It operates over 0°C to 70°C and is packaged in a 16-pin SOIC (D) package.

For engineers reviewing the SN74LS247D datasheet, SN74LS247D pinout, SN74LS247D application, or SN74LS247D equivalent, key selection considerations include its active-low open-collector output architecture, common-anode LED drive capability, integrated ripple-blanking input for cascaded display systems, and compatibility with standard TTL logic levels in industrial panel meters and legacy instrumentation.

Technical Context

The SN74LS247D implements combinational logic decoding of 4-bit binary-coded decimal (BCD) inputs (A0–A3) into seven active-low segment outputs (a–g), with additional control inputs: Lamp Test (LT̅), Ripple Blanking Input (RBI̅), and Blank Input/Output (BI̅/RBO̅). Its open-collector outputs require external pull-up resistors to V_CC and are optimized for driving common-anode LEDs without external current-limiting transistors.

It uses bipolar TTL process technology, ensuring compatible voltage thresholds (V_IH = 2.0 V min, V_IL = 0.8 V max), propagation delays under 45 ns (typical), and guaranteed operation across the commercial temperature range (0°C to 70°C). The BI̅/RBO̅ function enables daisy-chained blanking for multi-digit displays while maintaining independent digit control.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	74LS TTL - ensures interoperability with legacy LS-series logic and predictable noise margins.
Output Type	Active-low open-collector - requires external pull-ups; enables direct common-anode LED drive with flexible voltage rail selection.
Max Output Sink Current	40 mA per segment - supports bright LED segments without external driver stages.
Propagation Delay	45 ns (max at V_CC = 5 V, T_A = 25°C) - suitable for static and low-frequency multiplexed display applications.
Supply Voltage Range	4.75 V to 5.25 V - tight tolerance aligns with standard TTL power distribution and minimizes supply regulation overhead.
Operating Temperature	0°C to 70°C - validated for commercial-grade instrumentation and panel-mounted equipment.
Input Compatibility	TTL-level (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V) - eliminates need for level-shifting when interfacing with 74LS/74S logic.

Pinout & Package

SN74LS247D is housed in a 16-pin SOIC (D) package, 7.5 mm wide, with 1.27 mm pitch, compliant with JEDEC MS-012 and RoHS requirements. Pin 1 is located at the top-left corner adjacent to the notch or dot marking.

Pin/Terminal	Circuit Role	Design Meaning
1 (A0)	BCD Input Bit 0	Least-significant BCD digit input; TTL-compatible, referenced to GND.
2 (A1)	BCD Input Bit 1	Second BCD digit input; synchronous with A0–A3 for valid decode cycle.
3 (A2)	BCD Input Bit 2	Third BCD digit input; must be stable during setup/hold windows relative to clockless decode timing.
4 (A3)	BCD Input Bit 3	Most-significant BCD digit input; defines decimal value 0–9; values 10–15 yield blanked outputs.
5 (BI̅/RBO̅)	Blank Input / Ripple Blanking Output	Active-low blanking input; when asserted, forces all outputs high; also serves as cascaded blanking output when RBI̅ is active and inputs = 0.
6 (LT̅)	Lamp Test Input	Active-low; overrides all decoding to force all segment outputs low - verifies LED continuity and wiring integrity.
7 (RBI̅)	Ripple Blanking Input	Active-low; enables zero-suppression in multi-digit displays when all preceding digits are zero and LT̅ is inactive.
8 (GND)	Ground Reference	Power return path for logic and output drivers; must be low-impedance to minimize ground bounce in multi-segment switching.
9 (a)	Segment a Output	Open-collector output driving top horizontal LED segment; sinks current when active (low).
10 (b)	Segment b Output	Open-collector output driving upper-right vertical LED segment; shares same sink capability and timing as other segments.
11 (c)	Segment c Output	Open-collector output driving lower-right vertical LED segment; electrically identical to pins 9–15.
12 (d)	Segment d Output	Open-collector output driving bottom horizontal LED segment; used in '8' and '0' digit rendering.
13 (e)	Segment e Output	Open-collector output driving lower-left vertical LED segment; critical for '6', '8', '9' and '0'.
14 (f)	Segment f Output	Open-collector output driving upper-left vertical LED segment; required for '4', '5', '6', '8', '9'.
15 (g)	Segment g Output	Open-collector output driving middle horizontal LED segment; distinguishes '8' from '0' and enables '3', '9'.
16 (V_CC)	Positive Supply	+5 V DC supply; must be decoupled locally with 0.1 µF ceramic capacitor to suppress switching noise.

Key Features

Feature	Design Value
Integrated Lamp Test	Single-pin activation (LT̅) forces all seven outputs low - enables rapid visual verification of LED wiring and segment functionality without software intervention.
Ripple Blanking Architecture	BI̅/RBO̅ and RBI̅ pins support hierarchical blanking in multi-digit displays - suppresses leading zeros automatically without microcontroller overhead.
Common-Anode LED Drive	Open-collector outputs eliminate need for external PNP transistors or high-side switches - reduces BOM count and PCB area in discrete display designs.
TTL-Compatible Inputs	Direct connection to 74LS/74S logic families without level shifters - preserves signal integrity and simplifies inter-stage coupling in legacy digital systems.
Commercial Temperature Range	Validated operation from 0°C to 70°C - meets reliability requirements for non-automotive industrial control panels and benchtop test equipment.

Applications

Industrial Panel Meters	Legacy Test Equipment Displays
Use Scenario: Front-panel 4-digit numeric readout in programmable power supplies and multimeters. IC Role / Device Role / Timing Role: BCD-to-7-segment decoder driving common-anode LED digits via discrete current-limiting resistors. Use Value: Eliminates need for microcontroller-based display firmware and external driver ICs - reduces system cost and boot-time dependency on embedded code.	Use Scenario: Numeric display subsystem in 1980s-era oscilloscopes and logic analyzers requiring TTL-native interfaces. IC Role / Device Role / Timing Role: Static segment driver receiving parallel BCD from counter/timing ASICs; no clock required. Use Value: Matches original design intent and pinout of vintage instruments - enables drop-in replacement during repair or refurbishment.
Appliance Control Panels	Education & Lab Training Boards
Use Scenario: Temperature and timer display in microwave ovens and washing machines using discrete LED modules. IC Role / Device Role / Timing Role: Decode output from microcontroller GPIO port configured as parallel BCD bus. Use Value: Offloads segment mapping logic from MCU - frees CPU cycles for sensor processing and motor control in resource-constrained 8-bit systems.	Use Scenario: Hands-on digital logic labs where students wire BCD sources (switches, counters) to physical LED displays. IC Role / Device Role / Timing Role: Teaching tool demonstrating combinational logic, active-low signaling, and open-collector bus behavior. Use Value: Clear visual feedback of truth-table behavior with real-world current-sinking loads - reinforces foundational TTL concepts beyond simulation.

Industrial Panel Meters

Legacy Test Equipment Displays

Use Scenario: Front-panel 4-digit numeric readout in programmable power supplies and multimeters.

IC Role / Device Role / Timing Role: BCD-to-7-segment decoder driving common-anode LED digits via discrete current-limiting resistors.

Use Value: Eliminates need for microcontroller-based display firmware and external driver ICs - reduces system cost and boot-time dependency on embedded code.

Use Scenario: Numeric display subsystem in 1980s-era oscilloscopes and logic analyzers requiring TTL-native interfaces.

IC Role / Device Role / Timing Role: Static segment driver receiving parallel BCD from counter/timing ASICs; no clock required.

Use Value: Matches original design intent and pinout of vintage instruments - enables drop-in replacement during repair or refurbishment.

Appliance Control Panels

Education & Lab Training Boards

Use Scenario: Temperature and timer display in microwave ovens and washing machines using discrete LED modules.

IC Role / Device Role / Timing Role: Decode output from microcontroller GPIO port configured as parallel BCD bus.

Use Value: Offloads segment mapping logic from MCU - frees CPU cycles for sensor processing and motor control in resource-constrained 8-bit systems.

Use Scenario: Hands-on digital logic labs where students wire BCD sources (switches, counters) to physical LED displays.

IC Role / Device Role / Timing Role: Teaching tool demonstrating combinational logic, active-low signaling, and open-collector bus behavior.

Use Value: Clear visual feedback of truth-table behavior with real-world current-sinking loads - reinforces foundational TTL concepts beyond simulation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar BCD-to-7-segment decoder applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LS47N	Same logic function and pinout; differs only in PDIP packaging (16-pin N) and marking ('74LS47' vs 'LS247'); identical electrical specs and timing.	Requires through-hole PCB layout; not surface-mount compatible; same thermal and drive characteristics.	Select SN74LS47N only for through-hole prototyping or legacy board rework where SOIC footprint is unavailable.
SN74LS248N	Active-high outputs (for common-cathode LEDs); otherwise identical BCD decode logic, pinout, and timing; different output polarity necessitates redesign of LED orientation and pull-up/down networks.	Drives common-cathode displays instead of common-anode; incompatible without circuit modification.	Choose SN74LS248N only when migrating to common-cathode LED modules or when redesigning display hardware to simplify current sourcing.

Compared with SN74LS247D, SN74LS47N offers identical functionality in through-hole form for legacy assembly, while SN74LS248N provides complementary output polarity for common-cathode systems - neither is pin-compatible without layout or LED polarity changes, but both serve the same core BCD decoding purpose in distinct hardware contexts.

Availability

SN74LS247D is available at Aetrix Electronics and suitable for industrial panel meters, legacy test equipment refurbishment, and appliance control panels requiring stable component supply and long-term obsolescence mitigation.

Supply support for SN74LS247D 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 logic ICs with global manufacturing and quality certification across automotive, industrial, and consumer markets.

The SN74LS247D belongs to TI's legacy 74LS logic family, engineered specifically for reliable, low-power BCD-to-7-segment decoding in commercial-grade instrumentation and industrial control interfaces.

FAQ

What is the primary function of the SN74LS247D?

The SN74LS247D is a BCD-to-7-segment decoder/driver IC that converts 4-bit binary-coded decimal inputs into active-low signals for driving common-anode LED displays. It integrates lamp test, blanking, and ripple-blanking functions, and is implemented in bipolar TTL technology for compatibility with legacy digital systems. The SN74LS247D does not require a clock and operates combinatorially.

Can the SN74LS247D drive common-cathode LED displays?

No, the SN74LS247D cannot directly drive common-cathode LED displays because it features active-low open-collector outputs designed for sinking current into common-anode configurations. To use common-cathode LEDs, select the SN74LS248N instead - it provides identical decode logic but with active-high outputs. Rewiring or adding external inverters is not recommended due to timing and drive capability constraints in the SN74LS247D.

What is the maximum sink current per output pin on the SN74LS247D?

Each output pin (a–g) of the SN74LS247D is rated to sink up to 40 mA continuously under specified conditions (V_CC = 5 V, T_A = 25°C). This allows direct driving of standard LED segments without external transistor buffers. Total device current must remain within the absolute maximum rating of 70 mA for V_CC and 80 mA for GND to avoid thermal overstress.

How does the ripple blanking feature work on the SN74LS247D?

The SN74LS247D implements ripple blanking via the RBI̅ (Ripple Blanking Input) and BI̅/RBO̅ (Blank Input/Ripple Blanking Output) pins. When RBI̅ is low and all BCD inputs are zero, BI̅/RBO̅ goes low - blanking the current digit and propagating the blanking signal to the next most-significant digit. This enables automatic suppression of leading zeros in multi-digit displays without microcontroller involvement. The SN74LS247D requires proper cascading wiring between adjacent devices for correct operation.

Is the SN74LS247D still in active production?

The SN74LS247D is marked as Obsolete by Texas Instruments per official packaging documentation, though functional equivalents like SN74LS247DR and SN74LS247DR.A remain Active. Aetrix Electronics maintains inventory and supply-chain continuity for SN74LS247D to support legacy system maintenance, repair, and obsolescence management - ensuring availability even after TI discontinuation.

SN74LS247D Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

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

Packaging:: Tube

Product Status:: Obsolete

Display Type:: LED

Configuration:: 7 Segment

Interface:: BCD

Digits or Characters:: -

Current - Supply:: 7 mA

Voltage - Supply:: 4.75V ~ 5.25V

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SOIC

SN74LS247D FAQ

1.How can I place an order for SN74LS247D through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LS247D 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 SN74LS247D reliable?

The price and inventory of SN74LS247D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS247D is usually 5 days.

3.What payment methods are accepted for SN74LS247D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS247D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LS247D?

SN74LS247D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LS247D 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 SN74LS247D?

For technical support, including SN74LS247D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS247D requirements.

6.How does Aetrix verify that SN74LS247D is sourced from the original manufacturer or authorized distributors?

All SN74LS247D 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 SN74LS247D meets industry standards.

7.What is the process for return or replacement of SN74LS247D?

All SN74LS247D units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS247D, 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 SN74LS247D part is unused and in its original packaging.

Return procedure for SN74LS247D:

1.Submit a request within 90 days.

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

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