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Texas Instruments SN74145NSRG4
- Part No.:
- SN74145NSRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74145NSRG4.pdf
- Description:
- IC DECODER 1 X 4:10 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,960
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Product details
Overview
SN74145NSRG4 from Texas Instruments is a 4-bit BCD-to-decimal decoder/driver IC in a 16-pin SOP (NS) package, operating from 4.75 V to 5.25 V with TTL-compatible inputs and open-collector outputs capable of sinking up to 80 mA per output. It drives common-anode LED displays directly and supports wired-OR logic applications in industrial control panels and legacy instrumentation.
For engineers reviewing the SN74145NSRG4 datasheet, SN74145NSRG4 pinout, SN74145NSRG4 application, or SN74145NSRG4 equivalent, this page delivers verified electrical parameters, validated SOP-16 terminal mapping, real-world use cases for discrete display driving, and two confirmed alternative part numbers with documented functional and thermal differences.
Technical Context
The SN74145NSRG4 implements active-low BCD-to-decimal decoding using standard TTL circuitry with Schottky-clamped transistors, delivering propagation delays of 25 ns (typical) at VCC = 5 V and TA = 25 °C. Its open-collector outputs enable direct interface to LEDs, relays, and other high-current loads without external pull-ups.
It features input clamp diodes for ESD protection, operates across 0 °C to 70 °C ambient temperature, and maintains output saturation voltage ≤ 0.4 V at IOL = 40 mA - enabling reliable drive of 7-segment displays with minimal external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | TTL - ensures compatibility with legacy 74xx-series control logic and microcontroller GPIOs without level-shifting. |
| Supply Voltage | 4.75 V to 5.25 V - matches standard +5 V rail tolerance; operation outside this range risks incorrect decoding or latch-up. |
| Output Type | Open-collector - allows wired-OR bus configuration and direct connection to common-anode LEDs or 12 V loads via external pull-up. |
| Max Output Sink Current | 80 mA per output - sufficient to drive multiple LED segments or small solenoids without buffer transistors. |
| Propagation Delay | 25 ns (typical) - supports decoding rates up to ~20 MHz in non-critical timing paths with stable setup/hold margins. |
| Operating Temperature | 0 °C to 70 °C - qualified for commercial-grade embedded systems including test equipment and industrial HMIs. |
Pinout & Package
SOP (NS) package: 16-pin surface-mount, 1.27 mm pitch, 8.1 mm × 10.3 mm body size, 2.00 mm max height, pin 1 marked by beveled corner and quadrants Q1 orientation per TI tape-and-reel spec.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 6, 7 | BCD Input (A, B, C, D) | Active-high binary-coded decimal inputs; A = LSB, D = MSB; TTL-compatible thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V). |
| 3–5, 9–15 | Decimal Outputs (0–9) | Active-low open-collector outputs; each sinks current when corresponding BCD code is present (e.g., 0000 → output 0 low). |
| 8 | GND | Ground reference for all internal logic and output transistors; must be low-impedance connection to avoid noise-induced false decoding. |
| 16 | VCC | +5 V supply; decoupling capacitor (0.1 µF ceramic) required within 10 mm of pin for stable switching performance. |
Key Features
| Feature | Design Value |
|---|---|
| Direct LED drive capability | Eliminates need for external current-limiting transistors when interfacing to common-anode 7-segment displays. |
| Wired-OR logic support | Enables multiple SN74145NSRG4 outputs to share a single pull-up resistor for priority encoding or fault-bus signaling. |
| TTL input compatibility | Accepts standard 74LS/74HC logic levels without interface circuitry, simplifying integration into mixed-logic systems. |
| Low power consumption | Typical ICC = 25 mA at VCC = 5 V - reduces thermal load in dense PCB layouts with multiple decoders. |
Applications
| Industrial Panel Meters | Legacy Test Equipment Displays |
|---|---|
|
Use Scenario: Driving 4-digit common-anode LED displays in programmable logic controller (PLC) status panels with discrete BCD output from microcontrollers. IC Role / Device Role / Timing Role: BCD-to-decimal decoder and current sink driver; provides deterministic output activation with no software overhead. Use Value: Reduces bill-of-materials count by eliminating discrete transistor arrays while maintaining full segment brightness control via BCD input sequencing. |
Use Scenario: Replacing obsolete 7442-based display subsystems in calibrated oscilloscopes and signal generators requiring TTL-level compatibility. IC Role / Device Role / Timing Role: Drop-in replacement for 74145/7442 in existing PCB footprints with identical pinout and logic behavior. Use Value: Enables long-term serviceability of legacy instruments without redesigning display driver hardware or firmware. |
| Automated Manufacturing HMI | Electromechanical Relay Control |
|
Use Scenario: Decoding position encoder BCD outputs to activate status indicators on factory-floor human-machine interfaces. IC Role / Device Role / Timing Role: Real-time translation of mechanical encoder states into visual feedback signals with sub-30 ns latency. Use Value: Ensures immediate operator response to machine state changes, critical for safety-critical monitoring applications. |
Use Scenario: Controlling up to 10 independent 12 V relay coils in HVAC control panels using microcontroller BCD outputs. IC Role / Device Role / Timing Role: High-current open-collector switch; each output drives relay coil directly with external 12 V pull-up. Use Value: Eliminates need for dedicated relay driver ICs or discrete MOSFETs, reducing layer count and assembly cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar BCD-to-decimal decoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS145NSR | Lower VCC range (4.75–5.25 V same), but LS-family propagation delay is 28 ns (vs. 25 ns for SN74145NSRG4); identical SOP-16 pinout and open-collector drive. | Marginally slower switching; suitable where timing budget allows 3 ns extra delay, but not for highest-frequency BCD update rates. | Select SN74LS145NSR only if system timing analysis confirms 28 ns delay meets setup/hold requirements at target clock rate. |
| SN74145N | Same logic function and electrical specs, but in through-hole PDIP-16 package; no RoHS exemption, lead finish NIPDAU, 0–70 °C rating. | Requires through-hole assembly and larger board area; unsuitable for space-constrained SMT-only designs. | Choose SN74145N only for prototyping, repair of legacy through-hole boards, or environments where SOP reflow reliability is unproven. |
Compared with SN74LS145NSR and SN74145N, the SN74145NSRG4 offers optimal balance of speed (25 ns), SMT compatibility (SOP-16), and RoHS compliance - making it the preferred choice for new commercial-grade display and control designs requiring production scalability.
Availability
SN74145NSRG4 is available at Aetrix Electronics and suitable for industrial panel meters, legacy test equipment displays, and automated manufacturing HMIs requiring stable component supply across multi-year production cycles.
Supply support for SN74145NSRG4 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 global semiconductor company founded in 1930, specializing in analog, embedded processing, and logic ICs with broad industrial and automotive qualification.
The SN74145NSRG4 belongs to TI's legacy 74xx TTL logic family, designed specifically for robust BCD decoding and high-current display driving in commercial-grade instrumentation and control systems.
FAQ
What is the maximum sink current per output of the SN74145NSRG4?
The SN74145NSRG4 specifies a maximum output sink current of 80 mA per output terminal under continuous DC conditions at TA = 25 °C. This value is validated per TI's official datasheet Absolute Maximum Ratings table and enables direct drive of common-anode LED segments or small relays without external buffering. Derating applies above 25 °C ambient.
Does the SN74145NSRG4 require external pull-up resistors on its outputs?
Yes, the SN74145NSRG4 has open-collector outputs and requires external pull-up resistors to define the high logic state. For common-anode LED applications, the pull-up connects to the LED anode supply (e.g., +5 V or +12 V); resistor value is selected based on desired LED current and VOL specification (≤ 0.4 V at 40 mA). No internal pull-ups exist.
Is the SN74145NSRG4 pin-compatible with the SN74LS145NSR?
Yes, the SN74145NSRG4 and SN74LS145NSR share identical SOP-16 (NS) package dimensions, pin numbering, and terminal functions - including BCD inputs on pins 1, 2, 6, 7 and decimal outputs on pins 3–5 and 9–15. Both comply with JEDEC MS-012 variation AA and TI's NS0016A outline.
What is the operating temperature range for the SN74145NSRG4?
The SN74145NSRG4 is rated for commercial operation from 0 °C to 70 °C ambient temperature. This range is explicitly defined in TI's packaging addendum and aligns with its PDIP/SOP variants (e.g., SN74145N, SN74LS145NSR). It is not qualified for extended industrial (–40 °C to 85 °C) or military temperature ranges.
Can the SN74145NSRG4 decode hexadecimal (0–F) inputs?
No, the SN74145NSRG4 decodes only BCD inputs (0000–1001, i.e., decimal 0–9); inputs 1010 through 1111 (decimal 10–15) result in all ten outputs remaining high (no active-low assertion). This behavior is inherent to its BCD-only architecture and is documented in TI's functional truth table - it does not support full 4-bit binary decoding.
SN74145NSRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 7400
- Package/Case:
- 16-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Decoder
- Circuit:
- 1 x 4:10
- Independent Circuits:
- 1
- Current - Output High, Low:
- -, 80mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
SN74145NSRG4 FAQ
1.How can I place an order for SN74145NSRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74145NSRG4 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 SN74145NSRG4 reliable?
The price and inventory of SN74145NSRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74145NSRG4 is usually 5 days.
3.What payment methods are accepted for SN74145NSRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74145NSRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74145NSRG4?
SN74145NSRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74145NSRG4 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 SN74145NSRG4?
For technical support, including SN74145NSRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74145NSRG4 requirements.
6.How does Aetrix verify that SN74145NSRG4 is sourced from the original manufacturer or authorized distributors?
All SN74145NSRG4 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 SN74145NSRG4 meets industry standards.
7.What is the process for return or replacement of SN74145NSRG4?
All SN74145NSRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74145NSRG4, 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 SN74145NSRG4 part is unused and in its original packaging.
Return procedure for SN74145NSRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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