SN54LS47J Texas Instruments Hygrometer (Ceramic Dual-In-Line Packages) In Stock
Texas Instruments SN54LS47J is a BCD-to-7-segment decoder/driver IC in a 16-pin ceramic DIP package rated from -55°C to 125°C. Features ripple blanking and lamp test inputs for flexible display control in military and industrial environments. Suitable for driving common-anode LED displays with up to 12 mA sink current per segment.
- Manufacturer
- Texas Instruments
- Package
- Ceramic Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- SN54LS47J Datasheet PDF
- Category
- Hygrometer
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- BCD-to-7-segment decoding with open-collector outputs sinking up to 12 mA per segment
- Ripple blanking input/output for multi-digit displays with leading zero suppression
- Lamp test input for full display diagnostics without changing BCD input state
- Military-grade 16-pin ceramic DIP package rated from -55°C to 125°C
- LS-family TTL logic compatible with 5 V supply for straightforward interface to standard logic systems
Applications
The SN54LS47J is used in military-grade instrumentation, avionics panels, and industrial test equipment requiring reliable BCD-to-7-segment display decoding across wide temperature ranges from -55°C to 125°C. Its open-collector outputs directly drive common-anode 7-segment LED displays in numeric readouts for counters, clocks, and measurement instruments. The ripple blanking feature enables efficient multi-digit display systems, suppressing leading zeros to improve readability in panel meters and data display modules.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Additional Feature | RIPPLE BLANKING; LAMP TEST INPUT |
| Family | LS |
| Input Conditioning | STANDARD |
| JESD-30 Code | R-GDIP-T16 |
| JESD-609 Code | e0 |
| Load Capacitance (CL) | 15pF |
| Logic IC Type | SEVEN SEGMENT DECODER/DRIVER |
| Max I(ol) | 0.012A |
| Number of Bits | 7 |
| Number of Functions | 1 |
| Output Characteristics | OPEN-COLLECTOR |
| Output Polarity | INVERTED |
| Package Body Material | CERAMIC, GLASS-SEALED |
| Package Equivalence Code | DIP16,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Packing Method | TUBE |
| Power Supply Current-Max (ICC) | 13mA |
| Prop. Delay@Nom-Sup | 100ns |
| Propagation Delay (tpd) | 100ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | TTL |
| Temperature Grade | MILITARY |
| Terminal Finish | Tin/Lead (Sn/Pb) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Package | Ceramic Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
Can SN54LS47J operate reliably in military avionics applications requiring wide temperature range tolerance?
Yes. The SN54LS47J is specified from -55°C to 125°C, making it qualified for military and aerospace environments. The ceramic DIP-16 package provides hermetic protection against moisture and mechanical shock, and the LS-family logic operates from a 5 V supply with guaranteed TTL-compatible input thresholds across the full -55°C to 125°C temperature range.
How does the ripple blanking feature of SN54LS47J simplify multi-digit display designs?
The SN54LS47J includes both ripple blanking input (RBI) and output (RBO) pins, allowing cascaded decoder stages to suppress leading zeros automatically across 4 or more digits without additional logic gates. When the BCD input is zero and RBI is asserted low, all 7 segment outputs turn off and the RBO propagates the blanking signal to the next decoder, reducing component count in 4-digit or 8-digit numeric display systems.
What is the maximum segment sink current of SN54LS47J and how does it limit LED segment brightness?
The SN54LS47J open-collector outputs can sink a maximum of 12 mA (0.012 A) per segment. To drive common-anode LED segments at the desired brightness, a current-limiting resistor must be placed in series with each segment. At 5 V supply and a typical LED forward voltage of 2 V, a 250-ohm resistor achieves approximately 12 mA per segment, near the device's rated maximum output sink current.
Is SN54LS47J a suitable alternative to SN74LS47 for commercial-temperature board-level replacements?
Yes, with caveats. The SN54LS47J is functionally identical to the commercial SN74LS47 but rated to -55°C to 125°C versus the SN74LS47's 0°C to 70°C. For commercial-temperature designs where the -55°C lower bound is unnecessary, either part works at 5 V with 12 mA sink capability, but the SN54LS47J typically costs more due to its extended temperature qualification and ceramic package.
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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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