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Texas Instruments SN74LS595DG4
- Part No.:
- SN74LS595DG4
- Manufacturer:
- Texas Instruments
- Category:
- Shift Registers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74LS595DG4.pdf
- Description:
- IC REGISTER, D-TYPE SGL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,881
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Product details
Overview
SN74LS595DG4 from Texas Instruments is an 8-bit serial-in, parallel-out shift register with output latches and tri-state outputs, designed for digital logic expansion in microcontroller I/O-constrained systems. It operates at 4.75–5.25 V, supports 35 MHz max clock frequency, features TTL-compatible inputs, and drives up to 20 mA per output - enabling LED matrix control, 7-segment display multiplexing, and general-purpose GPIO extension.
For engineers reviewing the SN74LS595DG4 datasheet, SN74LS595DG4 pinout, SN74LS595DG4 application, or SN74LS595DG4 equivalent, key selection considerations include its SOIC-16 package, 0°C to 70°C industrial temperature range, RoHS-compliant NiPdAu lead finish, Level-1 moisture sensitivity rating, and compatibility with standard 5-V TTL logic families.
Technical Context
The SN74LS595DG4 integrates a dual-register architecture: a shift register stage accepting serial data via SER (pin 14) synchronized to SRCLK (pin 11), and a storage latch stage controlled by RCLK (pin 12). Data propagation from shift to storage register occurs on the rising edge of RCLK, decoupling serial loading from parallel output update.
Its output enable (OE̅, pin 13) provides active-low tri-state control over all eight Q0–Q7 outputs, allowing multiple devices to share a common bus. The serial output (Q7S, pin 9) enables daisy-chaining, supporting cascaded configurations without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75 V to 5.25 V - ensures stable operation within standard 5-V TTL rail tolerances. |
| Max Clock Frequency | 35 MHz - supports high-speed serial data loading for real-time I/O expansion. |
| Output Drive | 20 mA sink per output - directly drives LEDs or TTL inputs without external buffers. |
| Propagation Delay | 25 ns (typ.) - enables tight timing margins in synchronous digital systems. |
| Input Compatibility | TTL-level - interfaces directly with legacy 74LS/74HC microcontrollers and logic families. |
| Operating Temperature | 0°C to 70°C - qualified for commercial and industrial embedded environments. |
Pinout & Package
SN74LS595DG4 is housed in a 16-pin SOIC (D) package with 1.27 mm pitch, 10.3 mm body width, and 6.5 mm length - compatible with standard surface-mount assembly processes and reflow profiles (Level-1-260°C-UNLIM).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Q0) | Parallel Output | LSB of latched 8-bit parallel output; driven only when OE̅ is low. |
| 2–7 (Q1–Q5) | Parallel Outputs | Mid-range bits of latched output byte; support independent load control via RCLK. |
| 8 (GND) | Ground Reference | Common return path for logic and output current; must be low-impedance. |
| 9 (Q7S) | Serial Output | Shift register MSB output; enables cascading to additional SN74LS595DG4 devices. |
| 10 (SRCLR̅) | Shift Register Clear | Active-low asynchronous reset of shift register; does not affect storage latch. |
| 11 (SRCLK) | Shift Register Clock | Rising-edge-triggered clock for serial data entry into shift register. |
| 12 (RCLK) | Storage Register Clock | Rising-edge-triggered clock that transfers data from shift to storage register. |
| 13 (OE̅) | Output Enable | Active-low control of Q0–Q7 tri-state drivers; enables bus sharing. |
| 14 (SER) | Serial Data Input | LSB-first serial data input; synchronized to SRCLK. |
| 15 (Q6) | Parallel Output | Second-highest bit of latched output; matches Q7S timing for daisy-chain alignment. |
| 16 (VCC) | Power Supply | +5 V supply for internal logic and output drivers; requires local 0.1 µF bypass. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-register architecture | Separates serial loading (shift register) from output update (storage latch), eliminating output glitches during data transfer. |
| Tri-state output enable | OE̅ pin allows multiple SN74LS595DG4 devices to drive shared buses without contention or external bus switches. |
| Serial output (Q7S) | Enables seamless daisy-chaining of unlimited devices using single MCU data and clock lines. |
| Asynchronous shift clear | SRCLR̅ resets shift register independently of storage register, preserving displayed data during reinitialization. |
| TTL-compatible inputs | Accepts standard 5-V logic thresholds, ensuring interoperability with legacy 74LS, 74HC, and microcontroller GPIOs. |
Applications
| LED Matrix Driver | 7-Segment Display Controller |
|---|---|
|
Use Scenario: Driving 8×8 monochrome LED arrays in signage or status panels using limited MCU GPIOs. IC Role / Device Role / Timing Role: Serial-to-parallel converter providing 8-bit column select and row scan signals with precise RCLK-synchronized latching. Use Value: Reduces required MCU pins from 16 to 3 (SER, SRCLK, RCLK) while maintaining flicker-free refresh via glitch-free output update. |
Use Scenario: Controlling multi-digit 7-segment displays in test equipment or industrial HMIs. IC Role / Device Role / Timing Role: Latched parallel output driver delivering stable segment currents; OE̅ enables digit multiplexing. Use Value: Eliminates need for discrete transistors or dedicated display drivers; 20 mA per output directly sinks common-cathode segments. |
| GPIO Expander for MCU | Industrial Control Logic Interface |
|
Use Scenario: Adding 8 programmable digital outputs to resource-constrained 8-bit microcontrollers (e.g., PIC16, ATmega328P). IC Role / Device Role / Timing Role: Shift register + latch acting as software-configurable parallel port with hardware-based output hold. Use Value: Enables deterministic output state retention between serial updates; SRCLR̅ allows safe reset without affecting displayed data. |
Use Scenario: Interfacing PLC I/O modules with legacy TTL-based sensor/actuator subsystems. IC Role / Device Role / Timing Role: Level-shifting and signal conditioning buffer between 5-V control logic and field-side 24-V loads via external drivers. Use Value: Provides noise-immune serial configuration and robust 20 mA drive capability suitable for industrial wiring environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial-in/parallel-out shift register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC595N | CMOS process; wider VCC range (2–6 V); lower power; 25 mA output drive; higher max clock (100 MHz). | Preferred for battery-powered or mixed-voltage systems; less suitable for strict TTL-level noise margin requirements. | Select SN74HC595N when operating below 4.75 V or requiring lower quiescent current; verify input threshold compatibility with driving source. |
| 74LS164N | 8-bit serial-in/parallel-out without storage latch or tri-state outputs; no Q7S daisy-chain pin; open-collector outputs. | Limited to single-stage expansion; requires external pull-ups; unsuitable for bus-sharing or glitch-free update scenarios. | Choose 74LS164N only for cost-sensitive, non-latched applications where output persistence isn't required between shifts. |
Compared with SN74HC595N and 74LS164N, the SN74LS595DG4 uniquely balances TTL compatibility, latch-controlled output stability, and tri-state bus management - making it optimal for legacy 5-V systems requiring deterministic, glitch-free parallel output behavior.
Availability
SN74LS595DG4 is available at Aetrix Electronics and suitable for LED display systems, industrial control panels, and microcontroller-based instrumentation requiring stable component supply and long-term obsolescence resilience.
Supply support for SN74LS595DG4 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 leader founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial, automotive, and communications reach.
The SN74LS595DG4 belongs to TI's legacy 74LS logic family, engineered for robust 5-V TTL system integration, backward compatibility with military-grade SN54LS variants, and reliable operation in noise-prone industrial environments.
FAQ
What is the function of the SRCLR̅ pin on the SN74LS595DG4?
The SRCLR̅ (Shift Register Clear) pin is an active-low asynchronous input that resets the internal shift register to zero without affecting the storage latch contents. When asserted, it clears all bits in the shift stage, allowing safe reinitialization of serial data flow while preserving currently displayed or latched outputs on Q0–Q7. This behavior is critical for error recovery in LED display or GPIO expansion systems using the SN74LS595DG4.
Does the SN74LS595DG4 support daisy-chaining, and how is it implemented?
Yes, the SN74LS595DG4 supports daisy-chaining via its Q7S (serial output) pin, which outputs the MSB shifted out of the register. To cascade multiple SN74LS595DG4 devices, connect Q7S of one device to SER of the next, while sharing SRCLK and RCLK lines. This configuration allows a single MCU to control dozens of outputs using only three signal lines - a core design advantage confirmed in TI's official application notes for the SN74LS595DG4.
What is the maximum recommended clock frequency for the SN74LS595DG4?
The SN74LS595DG4 is rated for a maximum SRCLK and RCLK frequency of 35 MHz under typical conditions (VCC = 5 V, TA = 25°C), as specified in TI's official datasheet. At this rate, serial loading of 8 bits completes in under 230 ns, enabling high-throughput I/O expansion. Real-world timing margins should account for setup/hold times and PCB trace delays, especially in noisy industrial environments where the SN74LS595DG4 is commonly deployed.
How does the OE̅ pin affect output behavior on the SN74LS595DG4?
The OE̅ (Output Enable) pin is an active-low control that places all eight Q0–Q7 outputs in high-impedance (tri-state) mode when high, effectively disconnecting them from the bus. When low, outputs drive their latched values with up to 20 mA sink capability. This feature allows multiple SN74LS595DG4 devices to share a common data bus without contention - essential for modular display or control systems built around the SN74LS595DG4.
Is the SN74LS595DG4 RoHS compliant, and what is its lead finish?
Yes, the SN74LS595DG4 is RoHS compliant, with a NiPdAu (nickel-palladium-gold) lead finish, as documented in TI's packaging addendum. This finish ensures solderability, corrosion resistance, and compatibility with standard Pb-free reflow profiles (MSL Level-1, peak 260°C). The RoHS compliance status applies specifically to the DG4 suffix variant, distinguishing it from older SNPB-finished military versions like SNJ54LS595J.
SN74LS595DG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Shift Register
- Output Type:
- Tri-State
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Function:
- Serial to Parallel, Serial
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SN74LS595DG4 FAQ
1.How can I place an order for SN74LS595DG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS595DG4 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 SN74LS595DG4 reliable?
The price and inventory of SN74LS595DG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS595DG4 is usually 5 days.
3.What payment methods are accepted for SN74LS595DG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS595DG4 transactions.
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4.How is shipping managed for SN74LS595DG4?
SN74LS595DG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS595DG4 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 SN74LS595DG4?
For technical support, including SN74LS595DG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS595DG4 requirements.
6.How does Aetrix verify that SN74LS595DG4 is sourced from the original manufacturer or authorized distributors?
All SN74LS595DG4 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 SN74LS595DG4 meets industry standards.
7.What is the process for return or replacement of SN74LS595DG4?
All SN74LS595DG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS595DG4, 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 SN74LS595DG4 part is unused and in its original packaging.
Return procedure for SN74LS595DG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LS595DG4 Tags
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74HC165D,653
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SN74LV165APWR
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74HC165BQ,115
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CD4094BPWR
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