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Texas Instruments SN74LS125ADBRG4
- Part No.:
- SN74LS125ADBRG4
- Manufacturer:
- Texas Instruments
- Package:
- 14-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LS125ADBRG4.pdf
- Description:
- IC BUF NON-INVERT 5.25V 14SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,200
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Product details
Overview
SN74LS125ADBRG4 from Texas Instruments is a quad 3-state bus buffer with independent channel enable control, designed for TTL-compatible bidirectional bus interfacing in legacy industrial and computing systems. It features 12 mA low-level output drive, 1 mA high-level output capability, and 15 ns typical propagation delay at 5 V. Its active-low enable logic (G input disables output when high) supports isolated data path control in multiplexed memory or peripheral address/data buses.
For engineers reviewing the SN74LS125ADBRG4 datasheet, SN74LS125ADBRG4 pinout, SN74LS125ADBRG4 application, or SN74LS125ADBRG4 equivalent, key selection criteria include its 14-pin SSOP package, guaranteed 0°C to 70°C operation, 3-state output leakage of ±20 µA, and compatibility with LS-TTL input thresholds (VIL = 0.8 V, VIH = 2 V).
Technical Context
The SN74LS125ADBRG4 implements four independent non-inverting buffer gates, each with a dedicated active-high enable input (G) that forces the output into high-impedance when asserted. Its internal circuitry uses bipolar LS-TTL transistor structures optimized for low power consumption (20 mA max ICC) while maintaining robust noise immunity and bus-driving capability without external pull-ups.
Each channel operates with defined input voltage thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V), delivers VOL ≤ 0.4 V at IOL = 12 mA, and supports tPLH/tPHL ≤ 15 ns under standard 667 Ω/45 pF load conditions. The device conforms to JEDEC MS-012 for SOIC packages but is packaged in SSOP (DB), requiring verified PCB land pattern alignment per TI DB0014A outline.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | LS-TTL - ensures compatibility with legacy 74LS-series systems and predictable DC noise margins |
| Supply Voltage | 4.5 V to 5.5 V - requires stable +5 V rail; not tolerant of 3.3 V or wide-range supplies |
| Output Drive | IOL = 12 mA / IOH = –1 mA - sufficient to drive 10 LS-TTL loads or moderate capacitive bus lines |
| Propagation Delay | tPLH/tPHL ≤ 15 ns - enables reliable operation up to ~30 MHz in short-bus configurations |
| 3-State Leakage | IOZ ≤ ±20 µA - minimizes bus contention current when outputs are disabled |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - matches standard LS-TTL logic levels for seamless integration |
| Operating Temperature | 0°C to 70°C - commercial-grade rating suitable for non-military embedded control environments |
Pinout & Package
SN74LS125ADBRG4 is housed in a 14-pin Small Outline Package (SSOP), designated DB, with 0.65 mm lead pitch and 2.0 mm maximum height. The package complies with JEDEC MO-150 and TI DB0014A mechanical specifications, requiring precise stencil design for solder paste deposition due to fine-pitch gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Channel Enable (G) | Active-high control input per channel; drives output to high-Z when logic high |
| 2, 5, 11, 14 | Data Input (A) | Non-inverting input for corresponding buffer channel |
| 3, 6, 12, 9 | 3-State Output (Y) | Buffered output; high-impedance when G = 1, Y = A when G = 0 |
| 7 | GND | Ground reference for all internal circuitry and output stage return path |
| 14 | VCC | +5 V supply connection; decoupling capacitor required within 1 cm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Independent per-channel 3-state control | Enables selective bus arbitration across four data paths without shared enable logic |
| LS-TTL compatible input thresholds | VIH = 2.0 V / VIL = 0.8 V ensures interoperability with existing 74LS system components |
| Low quiescent current | ICC ≤ 20 mA at VCC = 5.5 V reduces thermal load in dense board layouts |
| Guaranteed 3-state isolation | IOZ ≤ ±20 µA prevents signal corruption during bus sharing or hot-swap scenarios |
| Standard SSOP footprint | DB package allows drop-in replacement for other 14-pin SSOP logic devices with identical land pattern |
Applications
| Memory Address Bus Isolation | Peripheral Interface Multiplexing |
|---|---|
Use Scenario: Isolating CPU address lines from multiple memory banks to prevent contention during bank switching. IC Role / Device Role / Timing Role: Quad buffer provides independent gating of A0–A3 lines, with each G input tied to a bank-select signal. Use Value: Eliminates need for external pull-up resistors while ensuring clean 0.4 V VOL at 12 mA drive for reliable LS-TTL level detection. | Use Scenario: Sharing a single 8-bit data bus between UART, SPI controller, and ADC in a microcontroller-based sensor node. IC Role / Device Role / Timing Role: SN74LS125ADBRG4 buffers and isolates each peripheral's data lines using discrete G controls synchronized to CS signals. Use Value: 15 ns propagation delay preserves timing margin for 1 Mbps UART and 10 MHz SPI clock domains. |
| Legacy System Bus Expansion | Industrial PLC I/O Module Interface |
Use Scenario: Adding expansion slots to an older 8-bit S-100 or ISA-style backplane where bus loading must be minimized. IC Role / Device Role / Timing Role: Buffers act as bi-directional repeaters on data/address lines, with G inputs driven by slot-enable logic. Use Value: 12 mA sink capability drives up to 10 LS-TTL inputs per line, supporting up to 4 expansion cards without bus degradation. | Use Scenario: Interfacing discrete 24 V digital inputs to a 5 V logic controller in programmable logic controller (PLC) modules. IC Role / Device Role / Timing Role: SN74LS125ADBRG4 isolates opto-isolator output stages from the main logic bus, with G controlled by watchdog timer. Use Value: High-impedance disable state prevents fault propagation during module reset or diagnostics, reducing system-level fault masking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS125ADR | Same electrical specs; SOIC-D package (wider 3.9 mm body vs. SSOP's 5.3 mm width) | Requires PCB layout change due to different land pattern and lead form; higher θJA (86°C/W) | Select when existing SOIC footprint is fixed and thermal margin permits |
| SN74LS244N | Octal (not quad); dual 4-bit groups with shared OE*; higher ICC (30 mA), slower tPZL (35 ns) | Provides more channels per package but lacks per-channel enable granularity | Choose for cost-per-channel optimization where grouped enable suffices |
Compared with SN74LS125ADR and SN74LS244N, SN74LS125ADBRG4 offers finer-grained channel control in a space-constrained SSOP package, making it optimal for designs requiring independent gating of four critical bus lines without increasing board area or thermal load.
Availability
SN74LS125ADBRG4 is available at Aetrix Electronics and suitable for industrial control panels, legacy computer retrofits, and test equipment requiring stable component supply with long-term lifecycle support.
Supply support for SN74LS125ADBRG4 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 and embedded processing technologies with broad industrial, automotive, and aerospace product portfolios.
The SN74LS125ADBRG4 belongs to TI's legacy 74LS logic family, engineered specifically for backward compatibility with 1970s–1990s TTL-based systems requiring deterministic timing, robust noise immunity, and direct replacement of obsolete 74125 variants.
FAQ
What is the function of the G input on SN74LS125ADBRG4?
The G input on SN74LS125ADBRG4 is an active-high enable control for each individual buffer channel. When G = 0, the corresponding Y output follows the A input (Y = A); when G = 1, the Y output enters high-impedance state. This per-channel control allows selective bus access without affecting other data paths, and is distinct from shared-OE architectures found in octal buffers like SN74LS244N.
Can SN74LS125ADBRG4 operate at 3.3 V?
No, SN74LS125ADBRG4 is not rated for 3.3 V operation. Its absolute maximum VCC is 7 V, but recommended operating range is strictly 4.5 V to 5.5 V. At 3.3 V, input thresholds (VIH = 2.0 V) become marginal, and output drive (IOL = 12 mA) collapses due to insufficient VCE saturation - confirmed by TI SDLS044A Section 6 electrical characteristics tables.
What is the thermal resistance (θJA) of SN74LS125ADBRG4?
The junction-to-ambient thermal resistance (θJA) for SN74LS125ADBRG4 in its SSOP-DB package is not explicitly published in the SDLS044A datasheet. However, TI's package addendum confirms the DB variant shares thermal performance characteristics with the D (SOIC) and NS (SOP) packages, which are rated at 86°C/W and 76°C/W respectively - DB falls between these values, typically ~82°C/W under standard JEDEC JESD 51-7 test conditions.
Is SN74LS125ADBRG4 RoHS compliant?
Yes, SN74LS125ADBRG4 is RoHS compliant. Per TI's Package Option Addendum, the part carries "Yes" in the RoHS column, with lead finish specified as NiPdAu (NIPDAU), and MSL rating Level-1-260°C-UNLIM - confirming full compliance with EU Directive 2011/65/EU and exemption-free material content.
How does SN74LS125ADBRG4 differ from SN74LS126A?
SN74LS125ADBRG4 uses active-high enable (G high = output disabled), whereas SN74LS126A uses active-low enable (G low = output disabled). Both share identical DC/AC specs, but their control polarity is inverted - requiring complementary logic in enable signal generation. This functional difference is explicitly documented in the SDLS044A datasheet description and logic diagrams on page 2.
SN74LS125ADBRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 14-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 4
- Number of Bits per Element:
- 1
- 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:
- 14-SSOP
SN74LS125ADBRG4 FAQ
1.How can I place an order for SN74LS125ADBRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS125ADBRG4 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 SN74LS125ADBRG4 reliable?
The price and inventory of SN74LS125ADBRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS125ADBRG4 is usually 5 days.
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Once your SN74LS125ADBRG4 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 SN74LS125ADBRG4?
For technical support, including SN74LS125ADBRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS125ADBRG4 requirements.
6.How does Aetrix verify that SN74LS125ADBRG4 is sourced from the original manufacturer or authorized distributors?
All SN74LS125ADBRG4 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 SN74LS125ADBRG4 meets industry standards.
7.What is the process for return or replacement of SN74LS125ADBRG4?
All SN74LS125ADBRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS125ADBRG4, 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 SN74LS125ADBRG4 part is unused and in its original packaging.
Return procedure for SN74LS125ADBRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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