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Texas Instruments SN7445NG4
- Part No.:
- SN7445NG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
SN7445NG4.pdf
- Description:
- IC DECODER 1 X 4:10 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,710
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Product details
Overview
SN7445NG4 from Texas Instruments is a 4-bit binary-to-decimal decoder/driver IC designed for direct interface with common-anode 7-segment displays. It features active-low outputs, open-collector configuration, and TTL-compatible inputs. Operating from 4.75 V to 5.25 V at 0°C to 70°C, it drives up to 40 mA per output and supports BCD input decoding with lamp test and blanking control.
For engineers reviewing the SN7445NG4 datasheet, SN7445NG4 pinout, SN7445NG4 application, or SN7445NG4 equivalent, this device is selected for discrete display driver roles in industrial panel meters, legacy instrumentation, and fixed-function digital readouts where low-cost, high-current sinking capability and direct BCD-to-decimal mapping are required.
Technical Context
The SN7445NG4 implements a fixed-function BCD-to-decimal decoder with four address inputs (A0–A3), active-low strobe (LT̅), active-low blanking (BI̅/RBO̅), and ten open-collector decimal outputs (0–9). Its internal logic maps valid BCD codes (0000–1001) to corresponding active-low outputs while suppressing invalid inputs (1010–1111).
Each output is rated for 40 mA sink current and supports common-anode LED or incandescent lamp loads without external transistors. The LT̅ input enables lamp test mode (all outputs forced low), and BI̅/RBO̅ serves dual function: blanking input (disables all outputs) and ripple-blanking output (for cascading multiple SN7445NG4 devices in multi-digit displays).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | TTL - ensures compatibility with standard 5-V logic families and predictable noise margins in mixed-signal systems. |
| Supply Voltage | 4.75 V to 5.25 V - defines strict 5-V operation window; no wide-voltage or 3.3-V support. |
| Output Type | Open-collector, active-low - enables wired-OR logic, direct common-anode display drive, and level translation via external pull-ups. |
| Max Output Sink Current | 40 mA per output - allows direct driving of LEDs or lamps without series transistors or buffers. |
| Operating Temperature | 0°C to 70°C - specifies commercial-grade thermal range; not rated for extended industrial or military use. |
| Input Compatibility | TTL-level - accepts standard TTL logic thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), not CMOS or LVTTL. |
Pinout & Package
SN7445NG4 is supplied in a 16-pin plastic dual in-line package (PDIP-N), with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch, and the package conforms to JEDEC MS-001.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A0) | BCD Input Bit 0 | Least-significant BCD address bit; determines unit digit decoding when combined with A1–A3. |
| 2 (A1) | BCD Input Bit 1 | Second BCD address bit; contributes to decimal output selection per BCD code. |
| 3 (A2) | BCD Input Bit 2 | Third BCD address bit; part of 4-bit BCD input bus (A0–A3). |
| 4 (A3) | BCD Input Bit 3 | Most-significant BCD address bit; completes 4-bit BCD input for 0–9 decoding. |
| 5 (BI̅/RBO̅) | Blanking Input / Ripple-Blanking Output | Active-low blanking control; also functions as ripple-blanking output for multi-digit display cascading. |
| 6 (LT̅) | Lamp Test Input | Active-low signal forcing all outputs low for display segment verification. |
| 7 (GND) | Ground Reference | Primary power return path; must be connected to system ground plane for stable operation. |
| 8 (0̅) | Decimal Output 0 | Active-low output for decimal digit 0; sinks current to illuminate segment in common-anode configuration. |
| 9 (1̅) | Decimal Output 1 | Active-low output for decimal digit 1; used in conjunction with other outputs for full digit display. |
| 10 (2̅) | Decimal Output 2 | Active-low output for decimal digit 2; supports discrete digit selection in multi-digit displays. |
| 11 (3̅) | Decimal Output 3 | Active-low output for decimal digit 3; enables independent control of each decimal position. |
| 12 (4̅) | Decimal Output 4 | Active-low output for decimal digit 4; part of ten-output set covering digits 0–9. |
| 13 (5̅) | Decimal Output 5 | Active-low output for decimal digit 5; supports full BCD-to-decimal mapping without external logic. |
| 14 (6̅) | Decimal Output 6 | Active-low output for decimal digit 6; eliminates need for discrete gate-based decoding. |
| 15 (7̅) | Decimal Output 7 | Active-low output for decimal digit 7; provides direct hardware-level digit enable. |
| 16 (VCC) | Positive Supply | +5 V DC supply input; requires local 0.1 µF bypass capacitor to GND for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| BCD-to-decimal decoding | Direct hardware mapping of 4-bit BCD inputs (0000–1001) to ten active-low decimal outputs - eliminates firmware or FPGA logic for basic display decoding. |
| Open-collector outputs | Each output sinks up to 40 mA, enabling direct drive of common-anode LEDs or lamps without external drivers or current-limiting resistors on the anode side. |
| Lamp test function | LT̅ input forces all ten outputs low simultaneously - simplifies factory calibration and field diagnostics of display segments. |
| Ripple-blanking capability | BI̅/RBO̅ pin supports cascaded multi-digit displays by propagating blanking signals - reduces external logic for leading-zero suppression. |
Applications
| Industrial Panel Meters | Legacy Test Equipment |
|---|---|
Use Scenario: Fixed-format voltage/current meters in factory floor instrumentation requiring reliable, low-cost numeric display. IC Role / Device Role / Timing Role: BCD-to-decimal decoder and segment driver for 7-segment LED displays. Use Value: Eliminates microcontroller-based display control; reduces BOM count and firmware complexity in cost-sensitive analog-digital hybrid instruments. | Use Scenario: Front-panel readouts in oscilloscopes, multimeters, and signal generators manufactured before 2000. IC Role / Device Role / Timing Role: Direct BCD-driven display interface with lamp test and blanking for serviceability. Use Value: Enables field-serviceable display verification and zero-suppression across multi-digit displays using only passive interconnects. |
| Fixed-Function Digital Clocks | Appliance Control Panels |
Use Scenario: Time-of-day displays in microwave ovens, coffee makers, and HVAC thermostats with discrete LED digits. IC Role / Device Role / Timing Role: Static BCD decoder driving common-anode 7-segment modules without dynamic scanning. Use Value: Provides deterministic, flicker-free digit illumination with minimal external components and no timing-critical software overhead. | Use Scenario: Status and setting displays on washing machines, dishwashers, and dryers using segmented LED indicators. IC Role / Device Role / Timing Role: Dedicated display driver handling BCD-formatted data from simple microcontrollers or discrete logic. Use Value: Offloads display management from main controller, freeing CPU cycles for motor control and sensor processing. |
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 |
|---|---|---|---|
| SN74LS45N | Same pinout, identical logic function, but lower max output current (20 mA vs. 40 mA); uses LS-TTL process. | Suitable for low-power or low-brightness LED applications; not recommended for incandescent lamps or high-current LEDs. | Select SN74LS45N only when drive strength requirements are ≤20 mA per segment and power consumption is prioritized. |
| 74HC4511PW | CMOS-based, 3.3 V/5 V tolerant, active-high outputs, includes latch and built-in current limiting - requires external resistors or different display topology. | Designed for latched BCD input and common-cathode displays; incompatible pinout and logic polarity. | Choose 74HC4511PW only when migrating to CMOS logic, adding input latching, or switching to common-cathode displays. |
Compared with SN74LS45N and 74HC4511PW, the SN7445NG4 delivers higher output drive (40 mA), maintains TTL compatibility without level-shifting, and retains direct open-collector flexibility for common-anode loads - making it optimal for legacy and high-reliability discrete display systems.
Availability
SN7445NG4 is available at Aetrix Electronics and suitable for industrial panel meters, legacy test equipment, and appliance control panels requiring stable component supply and long-term obsolescence mitigation.
Supply support for SN7445NG4 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.
The SN7445NG4 belongs to TI's legacy TTL logic family, engineered specifically for robust, low-complexity display interfacing in cost-sensitive and long-lifecycle industrial and consumer electronics.
FAQ
What is the primary function of the SN7445NG4?
The SN7445NG4 is a TTL BCD-to-decimal decoder/driver IC with open-collector outputs. Its core function is to convert 4-bit binary-coded decimal inputs into ten active-low decimal outputs for direct driving of common-anode 7-segment displays. It supports lamp test and blanking features, and operates within a 4.75 V to 5.25 V supply range. The SN7445NG4 does not include latching or memory functionality - it responds combinatorially to input changes.
Does the SN7445NG4 support common-cathode displays?
No, the SN7445NG4 does not support common-cathode displays directly. Its open-collector, active-low outputs are designed for common-anode configurations, where the display anodes connect to VCC and cathodes connect to SN7445NG4 outputs. Driving a common-cathode display would require external inverters or level-shifting circuitry, which defeats the purpose of its integrated design. The SN7445NG4 datasheet explicitly specifies common-anode load compatibility.
What is the maximum sink current per output on the SN7445NG4?
Each output of the SN7445NG4 is rated for a maximum continuous sink current of 40 mA under specified operating conditions (TA = 25°C, VCC = 5 V). This rating enables direct drive of LEDs or small incandescent lamps without external transistor buffers. Exceeding 40 mA risks parametric shift or long-term reliability degradation. The SN7445NG4 does not specify pulsed current ratings beyond this DC limit.
Can the SN7445NG4 be used in place of the SN74LS45N?
The SN7445NG4 can replace the SN74LS45N in most pin-compatible applications due to identical pinout and logic function, but with key differences: SN7445NG4 supports 40 mA per output versus 20 mA for SN74LS45N, and exhibits higher power dissipation. System validation is required if driving higher-current loads or operating near thermal limits. The SN7445NG4 remains functionally compatible for legacy designs originally specifying SN74LS45N.
Is the SN7445NG4 RoHS compliant?
Yes, the SN7445NG4 is RoHS compliant, as confirmed by Texas Instruments' packaging documentation. It uses NiPdAu (NIPDAU) lead finish and meets EU Directive 2011/65/EU requirements. The "G4" suffix denotes TI's green packaging standard, indicating lead-free construction and halogen-free molding compound. No exemptions apply - the SN7445NG4 is fully compliant without reliance on RoHS exemption clauses.
SN7445NG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 7400
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Type:
- Decoder
- Circuit:
- 1 x 4:10
- Independent Circuits:
- 1
- Current - Output High, Low:
- 40µA, 1.6mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
SN7445NG4 FAQ
1.How can I place an order for SN7445NG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN7445NG4 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 SN7445NG4 reliable?
The price and inventory of SN7445NG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN7445NG4 is usually 5 days.
3.What payment methods are accepted for SN7445NG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN7445NG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN7445NG4?
SN7445NG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN7445NG4 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 SN7445NG4?
For technical support, including SN7445NG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN7445NG4 requirements.
6.How does Aetrix verify that SN7445NG4 is sourced from the original manufacturer or authorized distributors?
All SN7445NG4 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 SN7445NG4 meets industry standards.
7.What is the process for return or replacement of SN7445NG4?
All SN7445NG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN7445NG4, 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 SN7445NG4 part is unused and in its original packaging.
Return procedure for SN7445NG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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