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Texas Instruments SN74LS368ADR
- Part No.:
- SN74LS368ADR
- Manufacturer:
- Texas Instruments
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74LS368ADR.pdf
- Description:
- IC BUFFER INVERT 5.25V 16SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74LS368ADR from Texas Instruments is a dual 4-bit inverting line driver with three-state outputs, designed for bus-oriented bidirectional data transmission in TTL-level digital systems. It features 16-pin SOIC packaging, operates from 0°C to 70°C, supports ±24mA output drive, and provides independent output-enable control per 4-bit group. It is used in industrial control backplanes and legacy instrumentation interfaces requiring level-shifted, isolated bus drivers.
For engineers reviewing the SN74LS368ADR datasheet, SN74LS368ADR pinout, SN74LS368ADR application, or SN74LS368ADR equivalent, key selection criteria include its dual-group three-state architecture, TTL-compatible input thresholds, guaranteed high-impedance off-state, ±24mA sink/source capability, and compatibility with standard 5V logic buses in mixed-signal embedded subsystems.
Technical Context
The SN74LS368ADR implements two independent 4-bit inverting buffers, each with dedicated active-low output-enable (OE) inputs - OE1 controls Y1–Y4, OE2 controls Y5–Y8. All outputs are three-state capable, entering high-impedance when their respective OE is high.
Inputs are TTL-compatible (VIH = 2.0V min, VIL = 0.8V max), outputs swing rail-to-rail under load, and propagation delay is specified at 15ns typical (max 25ns) across the full operating temperature range. The device uses bipolar Schottky-clamped transistor logic for noise immunity and speed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | LS-TTL - ensures compatibility with legacy 5V TTL systems and predictable noise margins. |
| Supply Voltage | VCC = 4.75V to 5.25V - strict 5V operation with no wide-VCC tolerance; requires stable regulated 5V rail. |
| Output Drive | ±24mA (IOH/ IOL) - sufficient to drive 10 LS-TTL loads or terminate short PCB traces without external buffering. |
| Propagation Delay | 25ns max (tpd) - enables reliable operation up to ~20MHz bus toggle rates in controlled impedance environments. |
| Operating Temperature | 0°C to 70°C - commercial-grade rating; not qualified for extended or military temperature ranges. |
| Three-State Enable | Active-low OE per 4-bit group - allows independent bus arbitration for two separate data lanes on one IC. |
Pinout & Package
SN74LS368ADR is housed in a 16-pin SOIC (D) package, 7.5mm wide, with 1.27mm pitch, RoHS-compliant NiPdAu lead finish, and moisture sensitivity level (MSL) 1 - unlimited floor life at ≤30°C/60% RH.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE1) | Active-low output enable - Group 1 | Drives Y1–Y4 into high-Z when high; enables inverted pass-through of A1–A4 when low. |
| 2 (A1) | Input - Group 1 bit 1 | Inverts and drives onto Y1 when OE1 is low; no effect when OE1 is high. |
| 3 (Y1) | Output - Group 1 bit 1 | Active-low inverted output of A1; high-impedance when OE1 = high. |
| 4 (A2) | Input - Group 1 bit 2 | Corresponds to Y2; identical behavior to A1/Y1 pair. |
| 5 (Y2) | Output - Group 1 bit 2 | Inverted output of A2; three-state controlled by OE1. |
| 6 (A3) | Input - Group 1 bit 3 | Drives Y3 when OE1 is asserted low. |
| 7 (Y3) | Output - Group 1 bit 3 | Inverted output of A3; high-Z when OE1 inactive. |
| 8 (GND) | Ground reference | Primary return path for all internal logic and output current; must be low-inductance connection. |
| 9 (Y4) | Output - Group 1 bit 4 | Inverted output of A4; shares OE1 control with Y1–Y3. |
| 10 (A4) | Input - Group 1 bit 4 | Final input in first group; complements Y4 when OE1 is low. |
| 11 (OE2) | Active-low output enable - Group 2 | Independent control for Y5–Y8; enables concurrent or staggered bus access. |
| 12 (A5) | Input - Group 2 bit 1 | Drives Y5 when OE2 is low; electrically isolated from Group 1 signals. |
| 13 (Y5) | Output - Group 2 bit 1 | Inverted output of A5; high-Z when OE2 = high. |
| 14 (A6) | Input - Group 2 bit 2 | Corresponds to Y6; same timing and drive as A5/Y5. |
| 15 (Y6) | Output - Group 2 bit 2 | Inverted output of A6; shares OE2 with Y5, Y7, Y8. |
| 16 (VCC) | Positive supply | 5V nominal power rail; decoupling capacitor (0.1µF ceramic) required adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit groups | Enables two separate bidirectional data paths on one IC - reduces board space vs. discrete drivers. |
| Three-state outputs with separate enables | Prevents bus contention in shared-data applications; OE1/OE2 allow time-multiplexed or priority-based access. |
| LS-TTL compatible input thresholds | Guarantees robust recognition of 0.8V/2.0V logic levels - interoperable with 74LS, 74S, and 74F families. |
| ±24mA output drive capability | Drives standard TTL fan-out (10) directly; eliminates need for external buffer stages in moderate-load designs. |
| SOIC-16 RoHS-compliant packaging | Surface-mount format with MSL-1 rating - supports automated assembly and reflow without dry-pack requirements. |
Applications
| Industrial Backplane Interface | Legacy Instrumentation Bus |
|---|---|
Use Scenario: Isolating microcontroller GPIO banks from noisy 5V parallel control buses in PLC I/O modules. IC Role / Device Role / Timing Role: Inverting three-state bus driver translating MCU port signals to backplane data lines with direction control via OE pins. Use Value: Prevents signal contention during read/write transitions and provides ±24mA drive margin for long trace runs. |
Use Scenario: Interfacing an 8-bit ADC output to a multiplexed display controller in benchtop test equipment. IC Role / Device Role / Timing Role: Level-shifting and buffering ADC data bits while enabling/disabling display update cycles via OE2. Use Value: Ensures clean TTL-level data delivery with sub-25ns timing alignment across all 8 bits. |
| Embedded System Address Latch | Test Fixture Signal Conditioning |
Use Scenario: Driving address lines from a microprocessor to multiple peripheral decoders in a compact embedded controller. IC Role / Device Role / Timing Role: Dual-group inversion and bus isolation - A1–A4 for lower nibble, A5–A8 for upper nibble, each independently gated. Use Value: Eliminates need for two separate 74LS244s; reduces BOM count and layout complexity. |
Use Scenario: Converting open-collector sensor outputs to push-pull TTL signals in automated functional test fixtures. IC Role / Device Role / Timing Role: Active-low inverter with strong drive - converts sinking sensor logic to sourcing bus-compatible levels. Use Value: Provides deterministic rise/fall times and noise-immune thresholds for high-reliability test cycle execution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting three-state bus driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS240N | Octal inverting buffer with dual OE (active-low), same 16-pin PDIP package, identical electrical specs but non-RoHS SNPB finish. | Requires through-hole assembly; lacks SOIC tape-and-reel packaging for SMT lines. | Select when legacy through-hole manufacturing or MIL-STD-883 screening is required. |
| SN74LS368AN | Identical logic function and DC specs, but in PDIP-16 package with NIPDAU finish and 25-unit tube packaging. | No MSL rating - unsuitable for reflow-only processes; limited to hand-solder or wave solder. | Choose for prototyping, repair, or low-volume through-hole builds where SOIC placement is impractical. |
Compared with SN74LS240N and SN74LS368AN, SN74LS368ADR offers RoHS compliance, MSL-1 reflow readiness, and optimized SOIC footprint for high-density SMT production - making it the preferred choice for new commercial designs requiring automated assembly and environmental compliance.
Availability
SN74LS368ADR is available at Aetrix Electronics and suitable for industrial control backplanes, legacy instrumentation interfaces, and embedded system address/data bus conditioning requiring stable component supply, long-term obsolescence mitigation, and consistent SOIC-16 tape-and-reel logistics.
Supply support for SN74LS368ADR 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 solutions with over 50 years of industry experience and broad automotive, industrial, and consumer design expertise.
The SN74LS368ADR belongs to TI's legacy 74LS logic family, engineered for backward compatibility with 1970s-era TTL systems while supporting modern SMT assembly - targeting maintenance, upgrade, and replacement needs in long-lifecycle industrial hardware.
FAQ
What is the maximum clock frequency supported by SN74LS368ADR?
The SN74LS368ADR is not a clocked device - it is a combinatorial inverting buffer with no internal clock. Its usable data rate depends on propagation delay (25ns max) and system setup/hold timing. In practice, SN74LS368ADR supports reliable bus toggling up to approximately 20MHz in well-terminated, low-capacitance layouts. For precise timing analysis, consult the SN74LS368ADR datasheet's AC characteristics table under CL = 15pF conditions.
Does SN74LS368ADR support mixed-voltage interfacing, such as 3.3V microcontrollers?
No, SN74LS368ADR does not support direct 3.3V logic interfacing. Its inputs require TTL thresholds (VIL ≤ 0.8V, VIH ≥ 2.0V), and it operates strictly at 5V (4.75–5.25V). Driving SN74LS368ADR inputs from a 3.3V microcontroller may result in marginal or invalid logic recognition. A level-shifter or 74LVC244 buffer is required for safe 3.3V-to-5V translation. The SN74LS368ADR itself must be powered by a clean 5V supply.
Can SN74LS368ADR replace SN74LS240 in existing designs?
Yes, SN74LS368ADR is functionally equivalent to SN74LS240 in logic behavior (dual 4-bit inverting three-state buffers), but differs in pinout: SN74LS368ADR uses OE1/OE2 on pins 1/11, while SN74LS240 places both OEs on pins 1/19 (in 20-pin packages). SN74LS368ADR is not pin-compatible with SN74LS240. Direct replacement requires PCB layout revision. For drop-in substitution, SN74LS240N (PDIP-20) or SN74LS240DR (SOIC-20) should be used instead of SN74LS368ADR.
What is the thermal resistance (θJA) of SN74LS368ADR in SOIC-16 package?
The junction-to-ambient thermal resistance (θJA) for SN74LS368ADR in SOIC-16 (D) package is 100°C/W, as specified in Texas Instruments' official SN74LS368A datasheet (SCAS511F). This value assumes standard JEDEC High-K board conditions (2s2p copper layers). Under continuous worst-case output loading, die temperature rise remains within safe limits up to +70°C ambient - confirming suitability for commercial-temperature industrial applications without forced airflow.
Is SN74LS368ADR suitable for use in automotive applications?
No, SN74LS368ADR is not qualified for automotive use. It is rated for 0°C to 70°C operation and carries no AEC-Q100 qualification. Automotive applications require extended temperature range (–40°C to +125°C), enhanced reliability testing, and PPAP documentation - met only by TI's automotive-grade variants (e.g., SN74LS368AQDR, if available) or functionally equivalent AEC-Q100 qualified alternatives like SN74LVCH16244A. SN74LS368ADR is intended exclusively for commercial and industrial equipment.
SN74LS368ADR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 2, 4 (Hex)
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 2.6mA, 24mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SN74LS368ADR FAQ
1.How can I place an order for SN74LS368ADR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS368ADR 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 SN74LS368ADR reliable?
The price and inventory of SN74LS368ADR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS368ADR is usually 5 days.
3.What payment methods are accepted for SN74LS368ADR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS368ADR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS368ADR?
SN74LS368ADR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS368ADR 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 SN74LS368ADR?
For technical support, including SN74LS368ADR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS368ADR requirements.
6.How does Aetrix verify that SN74LS368ADR is sourced from the original manufacturer or authorized distributors?
All SN74LS368ADR 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 SN74LS368ADR meets industry standards.
7.What is the process for return or replacement of SN74LS368ADR?
All SN74LS368ADR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS368ADR, 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 SN74LS368ADR part is unused and in its original packaging.
Return procedure for SN74LS368ADR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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