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Texas Instruments SN54LS47J
- Part No.:
- SN54LS47J
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-CDIP (0.300", 7.62mm)
- Datasheet:
-
SN54LS47J.pdf
- Description:
- BCD-TO-SEVEN-SEGMENT DECODERS/DR
- Quantity:
- Payment:
- Shipping:
Inventory:1,514
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Product details
Overview
SN54LS47J from Texas Instruments is a BCD-to-seven-segment decoder/driver IC designed for direct interface with common-anode LED displays. It features active-low open-collector outputs, lamp test (LT̅) and blanking (BI̅/RBO̅) inputs, and ripple-blanking functionality. Operates over -55°C to +125°C with TTL-compatible inputs and supports 0–9 decimal decoding with leading-zero suppression.
For engineers reviewing the SN54LS47J datasheet, SN54LS47J pinout, SN54LS47J application, or SN54LS47J equivalent, this device is selected for high-reliability, wide-temperature digital display systems requiring discrete logic-level segment drive without external current limiting resistors.
Technical Context
The SN54LS47J implements TTL-compatible BCD input decoding into seven active-low segment outputs (a–g), each capable of sinking ≥40 mA per output at VCC = 5 V. Its internal logic includes priority encoding for BI̅/RBO̅ (blanking input/ripple blanking output) to enable cascaded zero suppression across multi-digit displays.
It integrates a lamp test function (LT̅) that forces all segments ON regardless of BCD input, and uses open-collector outputs to allow wired-OR interconnection and flexible anode voltage selection up to 15 V. No internal pull-ups are provided - external pull-up resistors are required for segment loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75 V to 5.25 V - ensures stable TTL logic thresholds and output drive capability across military temperature range. |
| Output Sink Current | ≥40 mA per segment - enables direct drive of standard common-anode LEDs without series transistor buffering. |
| Input Logic Levels | VIH = 2.0 V min, VIL = 0.8 V max - guarantees interoperability with standard TTL and LS family logic sources. |
| Operating Temperature | -55°C to +125°C - qualified for aerospace, defense, and industrial control environments per MIL-PRF-38535. |
| Propagation Delay | 25 ns typical (tPLH/tPHL) - supports synchronous display updates in real-time instrumentation with minimal timing skew. |
| BCD Input Range | 0000–1001 (0–9) - decodes only valid decimal digits; invalid codes (1010–1111) force all segments OFF unless LT̅ is asserted. |
| Ripple Blanking | BI̅/RBO̅ pin supports daisy-chained zero suppression - eliminates leading zeros in multi-digit numeric displays without microcontroller intervention. |
Pinout & Package
Ceramic Dual-In-Line Package (CDIP), 16-pin, hermetically sealed with glass-frit lid (Package Code J), 0.300-inch width, 0.100-inch lead pitch, 5.08 mm max height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | BI̅/RBO̅ | Active-low blanking input / ripple-blanking output - enables cascaded zero suppression when connected to BI̅ of next stage. |
| 2 | LT̅ | Lamp test input - forces all segment outputs LOW when asserted, independent of BCD input, for display verification. |
| 3 | BI̅ | Blanking input - overrides decoding and forces all segment outputs HIGH (OFF) when active low. |
| 4–7 | B, C, D, A | BCD inputs (LSB to MSB order) - accepts binary-coded decimal values 0–9; pins labeled per standard 74-series BCD convention. |
| 9–15 | a–g | Active-low segment outputs - open-collector drivers for common-anode LED segments; require external pull-up to VANODE. |
| 8 | GND | Ground reference - return path for all internal logic and output sink currents. |
| 16 | VCC | Positive supply - powers internal TTL logic; must be 5 V ±5 % for guaranteed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Open-collector segment outputs | Supports direct connection to common-anode LEDs with anode voltages up to 15 V - eliminates need for level-shifting circuitry. |
| Ripple-blanking architecture | Enables automatic suppression of leading zeros across multi-digit displays using single-wire daisy-chain wiring - reduces firmware overhead. |
| Lamp test mode | Verifies full display functionality by forcing all segments ON simultaneously - simplifies factory test and field diagnostics. |
| Military-grade temperature range | Qualified per MIL-PRF-38535 Class B - ensures reliability in avionics, missile guidance, and ground vehicle control systems. |
| TTL-compatible input thresholds | Guarantees interoperability with legacy 74LS, 74S, and 74F logic families without level translation - preserves existing board designs. |
Applications
| Avionics Display Panels | Industrial Control HMI |
|---|---|
|
Use Scenario: Multi-digit altitude, heading, or engine parameter readouts in analog-digital hybrid cockpits. IC Role / Device Role / Timing Role: BCD-to-seven-segment decoder driving high-brightness common-anode LED modules with zero-suppressed formatting. Use Value: Eliminates microcontroller-based display scanning; provides deterministic, glitch-free digit rendering under EMI-heavy flight conditions. |
Use Scenario: Front-panel numeric indicators on PLCs, motor drives, and programmable logic controllers. IC Role / Device Role / Timing Role: Standalone segment driver interfacing between 4-bit parallel data buses and LED displays in harsh industrial environments. Use Value: Delivers robust, maintenance-free display operation across -55°C to +125°C ambient without thermal derating or fan cooling. |
| Test Equipment Front Ends | Military Communications Gear |
|
Use Scenario: Digital multimeters, frequency counters, and oscilloscope readouts requiring high-contrast, DC-driven LED digits. IC Role / Device Role / Timing Role: Real-time BCD decoding with lamp test and blanking for self-test and power-on verification sequences. Use Value: Enables hardware-level display validation before firmware initialization - critical for safety-critical calibration instruments. |
Use Scenario: Secure radio transceivers and tactical data terminals requiring tamper-resistant, long-lifecycle display subsystems. IC Role / Device Role / Timing Role: MIL-spec decoder supporting encrypted numeric channel ID and signal strength indicators. Use Value: Meets QML-38535 Class B qualification and 20+ year obsolescence management requirements for defense sustainment programs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar BCD-to-seven-segment decoder/driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN54LS48J | Active-high outputs for common-cathode LED displays; no ripple-blanking output (RBO̅); identical BCD decoding and lamp test. | Requires common-cathode display topology and separate blanking logic; unsuitable for zero-suppressed multi-digit layouts. | Select SN54LS48J only when driving common-cathode LEDs and ripple blanking is not required. |
| SN74LS47N | Commercial temperature range (0°C to +70°C); plastic DIP package; same pinout and logic function as SN54LS47J. | Not qualified for military/aerospace use; lower cost and higher volume availability for non-ruggedized instrumentation. | Choose SN74LS47N for cost-sensitive, non-military embedded systems where extended temperature operation is unnecessary. |
Compared with SN54LS47J, SN54LS48J requires redesign of display anode/cathode routing and loses zero-suppression capability, while SN74LS47N sacrifices military temperature range and hermetic packaging - making SN54LS47J the sole choice for high-reliability, wide-temperature, common-anode LED drive.
Availability
SN54LS47J is available at Aetrix Electronics and suitable for avionics display panels, industrial control HMIs, and military communications gear requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SN54LS47J 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 broad industrial, automotive, and defense market reach.
The SN54LS47J belongs to TI's military-grade TTL logic family, developed in the 1970s for high-reliability digital display subsystems in aerospace and defense platforms where deterministic timing and environmental resilience are mandatory.
FAQ
What is the maximum anode voltage supported by SN54LS47J segment outputs?
The SN54LS47J open-collector outputs support up to 15 V on the segment anode side when used with appropriate external pull-up resistors. This allows direct interface with high-brightness LEDs or higher-voltage display modules without additional level-shifting circuitry, provided the output sink current remains within the 40 mA per segment limit specified in the datasheet.
Does SN54LS47J require external pull-up resistors on its segment outputs?
Yes, SN54LS47J requires external pull-up resistors on pins 9–15 (a–g) because all segment outputs are open-collector. These resistors connect each segment output to the common-anode supply rail and set the segment current based on Ohm's Law - typical values range from 220 Ω to 1 kΩ depending on LED forward voltage and desired brightness.
How does ripple blanking work on SN54LS47J, and what is its practical benefit?
Ripple blanking on SN54LS47J uses the BI̅/RBO̅ pin to cascade blanking signals across multiple digits: when a digit decodes to zero and all inputs are low, RBO̅ goes active-low, blanking the next most-significant digit if its BI̅ is tied to that RBO̅. This enables automatic suppression of leading zeros in multi-digit displays without software intervention or extra logic gates.
Can SN54LS47J drive common-cathode LED displays?
No, SN54LS47J cannot directly drive common-cathode LED displays because it provides active-low open-collector outputs designed for common-anode configurations. For common-cathode displays, SN54LS48J - which has active-high outputs - is the functionally matched alternative in the same military temperature grade and CDIP package.
What is the difference between SN54LS47J and SN74LS47N beyond temperature range?
Beyond the operating temperature range (-55°C to +125°C vs. 0°C to +70°C), SN54LS47J uses a hermetically sealed ceramic DIP (CDIP) package with tin-lead leads for MIL-STD-883 compliance, while SN74LS47N uses a plastic DIP (PDIP) with RoHS-compliant NiPdAu finish. SN54LS47J also undergoes more rigorous screening including burn-in and radiation hardness testing per QML-38535 requirements.
SN54LS47J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54LS
- Package/Case:
- 16-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Decoder
- Circuit:
- 1 x 4:7
- Independent Circuits:
- 1
- Current - Output High, Low:
- 50µA, 3.2mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-CDIP
SN54LS47J FAQ
1.How can I place an order for SN54LS47J through Aetrix?
Please submit a Request for Quotation (RFQ) for SN54LS47J 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 SN54LS47J reliable?
The price and inventory of SN54LS47J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN54LS47J is usually 5 days.
3.What payment methods are accepted for SN54LS47J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN54LS47J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN54LS47J?
SN54LS47J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN54LS47J 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 SN54LS47J?
For technical support, including SN54LS47J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN54LS47J requirements.
6.How does Aetrix verify that SN54LS47J is sourced from the original manufacturer or authorized distributors?
All SN54LS47J 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 SN54LS47J meets industry standards.
7.What is the process for return or replacement of SN54LS47J?
All SN54LS47J units undergo pre-shipment inspection (PSI). If there is an issue with SN54LS47J, 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 SN54LS47J part is unused and in its original packaging.
Return procedure for SN54LS47J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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