SN74LS247DRE4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments SN74LS247DRE4 is a BCD-to-seven-segment decoder and driver IC in the LS logic family, featuring ripple blanking and lamp test inputs for direct drive of common-anode displays. Drives up to 8 mA per segment output with 15 pF load capacitance rating, housed in a 16-pin SOIC package. Available from global distributors in tape-and-reel format for automated SMT production lines.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- SN74LS247DRE4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- BCD-to-seven-segment decoding with built-in ripple blanking eliminates external logic for multi-digit display zero suppression
- Lamp test input allows all 7 display segments to be illuminated simultaneously for automated display fault detection during manufacturing test
- Open-collector outputs sink up to 8 mA per segment, directly driving common-anode LED displays without external current limiters in typical configurations
- 16-pin SOIC package (R-PDSO-G16) enables compact PCB footprint for numeric panel meters, industrial counters, and instrumentation displays
Applications
The SN74LS247DRE4 is a classic BCD decoder driver for numeric LED display panels in industrial panel meters, frequency counters, and temperature indicators where direct hardware decoding of BCD data is preferred over software character generation. Its ripple blanking I/O pins allow multiple SN74LS247 stages to be cascaded for multi-digit displays with automatic leading-zero suppression. Lamp test capability also makes it useful in safety-critical instrumentation where periodic display self-check is a regulatory requirement.
Specifications
| YTEOL | 0 |
| Additional Feature | RIPPLE BLANKING; LAMP TEST INPUT |
| Family | LS |
| Input Conditioning | STANDARD |
| JESD-30 Code | R-PDSO-G16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 15pF |
| Logic IC Type | SEVEN SEGMENT DECODER/DRIVER |
| Max I(ol) | 0.008A |
| Number of Functions | 1 |
| Output Characteristics | OPEN-COLLECTOR |
| Output Polarity | INVERTED |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 13mA |
| Prop. Delay@Nom-Sup | 100ns |
| Propagation Delay (tpd) | 100ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.25V |
| Supply Voltage-Min (Vsup) | 4.75V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | TTL |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 40 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN74LS247DRE4:
Decoder/Driver, LS Series, Inverted Output, TTL, PDSO16
Frequently Asked Questions
How does the ripple blanking feature of SN74LS247DRE4 simplify multi-digit leading-zero suppression?
The SN74LS247DRE4 provides both a Ripple Blanking Input (RBI) and Ripple Blanking Output (RBO) pin. When RBI is asserted low on a digit stage displaying zero, the device blanks the display and propagates the blank signal through RBO to the next less-significant digit. Cascading multiple SN74LS247 decoders in this way achieves automatic leading-zero suppression across a 4 to 8 digit numeric display without any external logic or microcontroller involvement.
For a 7-segment LED display panel, what output current does SN74LS247DRE4 provide and which display polarity does it drive?
The SN74LS247DRE4 features open-collector outputs that can sink up to 8 mA per segment, which is sufficient to directly drive standard common-anode LED display segments at moderate brightness. The open-collector structure means the outputs pull low to illuminate a segment, making the device compatible only with common-anode display configurations. A current-limiting resistor of 330 to 470 ohm per segment is typically placed between the 5 V supply and each segment anode to set LED current.
When is the lamp test input on SN74LS247DRE4 useful in industrial equipment design?
The lamp test input on the SN74LS247DRE4 forces all 7 segment outputs active simultaneously when asserted, illuminating all segments of the connected display regardless of BCD input state. This is particularly useful in industrial instruments where a display self-test routine is triggered at power-up or via a front-panel button to verify that no LED segments have failed. Regulatory standards for safety instrumentation such as IEC 61010 sometimes require this kind of periodic indicator self-check capability.
How does SN74LS247DRE4 differ from SN74LS248 and which applications suit each decoder variant?
The SN74LS247DRE4 produces active-low outputs suitable for common-anode LED displays, while the SN74LS248 produces active-high outputs for common-cathode displays. Both devices decode the same 4-bit BCD input to 7-segment code across digits 0 through 15, including six non-BCD indicator patterns. Selecting between the two depends entirely on the display type: choose SN74LS247 for common-anode segments (anode at 5 V, cathode driven by decoder) and SN74LS248 for common-cathode segments (cathode at ground, anode driven by decoder).
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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