My Inquiry
My Account
Texas Instruments SN74LS02DG4
- Part No.:
- SN74LS02DG4
- Manufacturer:
- Texas Instruments
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74LS02DG4.pdf
- Description:
- IC GATE NOR 4CH 2-INP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,090
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74LS02DG4 from Texas Instruments is a quad 2-input NOR gate logic IC in SOIC-14 package, operating over 0°C to 70°C, with typical propagation delay of 15 ns at VCC = 5 V and fan-out capability of 20 LS-TTL loads. It serves as a fundamental combinational logic element in digital control circuits, bus arbitration, and enable/disable signal conditioning.
For engineers reviewing the SN74LS02DG4 datasheet, SN74LS02DG4 pinout, SN74LS02DG4 application, or SN74LS02DG4 equivalent, key selection considerations include its TTL-compatible input thresholds, guaranteed noise margin of 0.4 V (min), output drive strength (IOH = –0.4 mA / IOL = 8 mA), and compatibility with legacy 74LS-family PCB layouts requiring no redesign.
Technical Context
The SN74LS02DG4 implements four independent 2-input NOR gates using bipolar Schottky transistor technology, delivering improved speed-power trade-offs versus standard TTL. Each gate features active-low open-collector compatible outputs with internal clamp diodes for transient suppression.
It adheres to JEDEC MS-012 variation AB mechanical standards for SOIC packages and supports standard 5-V single-supply operation without biasing requirements. Input clamping ensures robustness against undershoot/overshoot within ±0.5 V beyond supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74LS (Low-power Schottky TTL) - enables direct drop-in replacement for legacy 74LS designs with verified timing and voltage compatibility. |
| Propagation Delay | 15 ns (max) at VCC = 5 V, CL = 15 pF - ensures predictable timing in synchronous control paths up to ~30 MHz clock domains. |
| Output Drive | IOL = 8 mA (min), IOH = –0.4 mA (min) - sufficient to directly drive multiple LS-TTL inputs or small LEDs without external buffers. |
| Input Thresholds | VIL = 0.8 V (max), VIH = 2.0 V (min) - provides 0.4 V noise margin under worst-case conditions, supporting reliable operation in noisy industrial environments. |
| Supply Voltage | VCC = 4.75 V to 5.25 V - matches standard 5-V regulated rail tolerances and eliminates need for additional voltage regulation. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems including instrumentation, office equipment, and peripheral controllers. |
Pinout & Package
SN74LS02DG4 uses a 14-pin SOIC (D) package per JEDEC MS-012AB, with 1.27 mm pitch, 8.75 mm body width, and 1.75 mm max height. Pin 1 is located at the top-left corner with notch or beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 8, 9, 11, 12 | Input (A/B per gate) | Four independent NOR gates: Gate 1 (pins 1,2→3), Gate 2 (pins 4,5→6), Gate 3 (pins 8,9→10), Gate 4 (pins 11,12→13). |
| 3, 6, 10, 13 | Output (Y per gate) | Active-low CMOS/TTL-compatible outputs; each capable of sinking 8 mA while maintaining VO L ≤ 0.5 V. |
| 7 | GND | Ground reference for all logic and output stages; requires low-impedance connection to minimize ground bounce in multi-gate switching. |
| 14 | VCC | +5 V supply input; decoupling capacitor (0.1 µF ceramic) must be placed within 5 mm of this pin for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Quad 2-input NOR function | Integrates four independent logic gates in one SOIC-14 package, reducing board space and interconnect complexity versus discrete gate solutions. |
| 74LS-compatible electrical specs | Guaranteed VIL/VIH, VOL/VOH, and propagation delay match industry-standard 74LS02 timing and interface behavior across temperature and voltage. |
| Internal input clamping diodes | Protects inputs from –0.5 V to VCC + 0.5 V transients, eliminating need for external ESD protection in moderate-noise applications. |
| SOIC packaging with RoHS compliance | Lead-free NiPdAu finish, Level-1 moisture sensitivity, and tape-and-reel delivery (2500 pcs/reel) support automated SMT assembly and environmental compliance. |
Applications
| Industrial Control Logic | Computer Peripheral Interface |
|---|---|
Use Scenario: Discrete safety interlock monitoring in PLC I/O modules where redundant sensor signals must be logically OR'd and inverted to generate a fail-safe shutdown command. IC Role / Device Role / Timing Role: NOR gate configured as active-low OR-equivalent (via De Morgan's law), providing deterministic response within 15 ns to input state changes. Use Value: Eliminates need for external inverters or microcontroller polling, enabling hardware-level fault reaction independent of firmware execution. | Use Scenario: Bus enable/disable control in legacy ISA or parallel printer interfaces, where address decode outputs are combined to assert chip select only when both address and strobe conditions are met. IC Role / Device Role / Timing Role: Dual-input NOR used to gate two asynchronous control signals, ensuring precise setup/hold timing relative to data valid windows. Use Value: Provides sub-20 ns decision latency critical for meeting IEEE 1284 timing budgets without adding FPGA or CPLD overhead. |
| Test Equipment Signal Conditioning | Automated Test Fixture Sequencing |
Use Scenario: Pulse shaping and inversion in benchtop DMM or oscilloscope trigger path, converting TTL-level edge detectors into clean, jitter-free gate signals for ADC sampling clocks. IC Role / Device Role / Timing Role: NOR gate used as inverter (one input tied high) with controlled rise/fall times (typ. 10 ns), minimizing metastability in downstream synchronizers. Use Value: Delivers consistent 5-V logic levels with <0.5 V output noise floor, improving measurement repeatability in high-resolution instruments. | Use Scenario: Sequence controller in burn-in test racks that activates power supplies only after thermal stabilization and safety relay confirmation. IC Role / Device Role / Timing Role: Three NOR gates wired as RS latch and enable gate to hold "ready" state until all preconditions are simultaneously satisfied. Use Value: Enables fully hardware-based sequencing with zero software dependency, satisfying MIL-STD-810G environmental startup reliability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NOR gate logic applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS02N | Same logic function and DC specs, but in PDIP-14 package with 25-piece tube packaging and 0°C–70°C rating. | Preferred for through-hole prototyping, manual rework, or legacy wave-soldered assemblies where SOIC reflow is unavailable. | Select SN74LS02N when hand-soldering, breadboarding, or maintaining existing DIP-based designs; SN74LS02DG4 is optimal for high-volume SMT production. |
| SN74LS260N | Dual 5-input NOR gate (not quad 2-input); higher input count per package but incompatible pinout and logic structure. | Suitable only where system logic requires wide-input NOR functions (e.g., priority encoder enable), not gate-level substitution. | Choose SN74LS260N only if redesigning logic equations to consolidate functions; not a functional or pin-compatible replacement for SN74LS02DG4. |
Compared with SN74LS02N, SN74LS02DG4 offers surface-mount compatibility and tighter thermal resistance for dense layouts, while SN74LS260N serves distinct multi-input logic needs-neither replaces SN74LS02DG4 without circuit redesign.
Availability
SN74LS02DG4 is available at Aetrix Electronics and suitable for industrial control logic, computer peripheral interface, test equipment signal conditioning, and automated test fixture sequencing requiring stable component supply across extended production cycles.
Supply support for SN74LS02DG4 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 specializing in analog, embedded processing, and logic technologies, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74LS02DG4 belongs to TI's legacy 74LS logic family, designed specifically for backward-compatible upgrades of 5-V TTL systems requiring proven reliability, predictable timing, and broad design ecosystem support.
FAQ
What is the maximum clock frequency supported by SN74LS02DG4 in toggle mode?
The SN74LS02DG4 is a combinational logic device-not a sequential circuit-so it has no inherent clock frequency limit. Its usable toggle rate depends on propagation delay (15 ns max) and system-level factors like load capacitance and trace inductance. In practice, reliable operation is confirmed up to 30 MHz for simple gate-to-gate feedback loops with CL ≤ 15 pF, as validated in TI's 74LS characterization reports.
Can SN74LS02DG4 drive LED indicators directly?
Yes, SN74LS02DG4 can directly drive standard 5-mm LEDs with series resistors. With IOL = 8 mA (min) and VOL ≤ 0.5 V, a 330 Ω resistor yields ~12 mA sink current at 5 V supply-within both LED and SN74LS02DG4 safe operating limits. Ensure thermal derating if multiple outputs switch simultaneously in ambient >50°C.
Is SN74LS02DG4 pin-compatible with SN74LS02DR?
Yes, SN74LS02DG4 and SN74LS02DR share identical SOIC-14 (D) package dimensions, pinout, and electrical specifications. Both are RoHS-compliant, Level-1 MSL-rated, and specified for 0°C to 70°C operation. The G4 suffix denotes TI's green packaging standard (halogen-free, matte tin lead finish), while DR indicates tape-and-reel packaging-functionally interchangeable in layout and schematic.
Does SN74LS02DG4 require external pull-up resistors on inputs?
No, SN74LS02DG4 inputs are TTL-compatible and internally biased; unused inputs must be tied to VCC or GND to prevent floating states. Pull-up resistors are unnecessary and may degrade noise margin. TI recommends hard-wiring spare inputs to VCC (for NOR logic high-enable) or GND (to disable gate) per datasheet Section 7.2.
What is the recommended PCB layout practice for SN74LS02DG4 power integrity?
Place a 0.1 µF X7R ceramic capacitor between VCC (pin 14) and GND (pin 7) with trace length <5 mm. Use solid ground plane beneath the IC, avoid splits under the package, and route VCC/GND traces ≥ 0.3 mm wide. Follow TI's D0014A land pattern (1.27 mm pitch, 0.6 mm pad width) to ensure solder joint reliability and thermal dissipation.
SN74LS02DG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- NOR Gate
- Number of Circuits:
- 4
- Number of Inputs:
- 2
- Features:
- -
- Voltage - Supply:
- 4.75V ~ 5.25V
- Current - Quiescent (Max):
- -
- Current - Output High, Low:
- 400µA, 16mA
- Input Logic Level - Low:
- 0.8V
- Input Logic Level - High:
- 2V
- Max Propagation Delay @ V, Max CL:
- 15ns @ 5V, 15pF
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74LS02DG4 FAQ
1.How can I place an order for SN74LS02DG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS02DG4 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 SN74LS02DG4 reliable?
The price and inventory of SN74LS02DG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS02DG4 is usually 5 days.
3.What payment methods are accepted for SN74LS02DG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS02DG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS02DG4?
SN74LS02DG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS02DG4 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 SN74LS02DG4?
For technical support, including SN74LS02DG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS02DG4 requirements.
6.How does Aetrix verify that SN74LS02DG4 is sourced from the original manufacturer or authorized distributors?
All SN74LS02DG4 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 SN74LS02DG4 meets industry standards.
7.What is the process for return or replacement of SN74LS02DG4?
All SN74LS02DG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS02DG4, 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 SN74LS02DG4 part is unused and in its original packaging.
Return procedure for SN74LS02DG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LS02DG4 Tags
-
SN74LVC1G14DBVR
Texas Instruments
-
SN74LVC1G14DCKR
Texas Instruments
-
SN74AHC1G14DBVR
Texas Instruments
-
SN74LVC1G08DBVR
Texas Instruments
-
SN74LVC1G08DCKR
Texas Instruments
-
SN74LVC1G32DCKR
Texas Instruments
-
SN74LVC1G04DBVR
Texas Instruments
.jpg)
-
74LVC1G08GW,125
Nexperia USA Inc.
-
SN74LVC1G04DCKR
Texas Instruments
-
SN74AHC1G08DBVR
Texas Instruments
-
SN74LVC1G32DBVR
Texas Instruments
-
SN74AHCT1G08DBVR
Texas Instruments
Tech Hub
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
