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Texas Instruments SN64BCT125AN
- Part No.:
- SN64BCT125AN
- Manufacturer:
- Texas Instruments
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
SN64BCT125AN.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,046
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Product details
Overview
SN64BCT125AN from Texas Instruments is a quad 3-state bus buffer with independent line drivers, designed for address/data bus isolation in TTL-compatible systems. It operates at 4.5–5.5 V, delivers ±64 mA output drive, features high-impedance state during power-up/down, and is rated for −40°C to 85°C industrial temperature range.
For engineers reviewing the SN64BCT125AN datasheet, SN64BCT125AN pinout, SN64BCT125AN application, or SN64BCT125AN equivalent, this page provides verified electrical specs, DIP-14 package details, timing characteristics (tPLH ≤ 5.2 ns), ESD protection (>2000 V), and validated alternatives for bus buffering and memory address register interfacing.
Technical Context
This BiCMOS device integrates four independent non-inverting buffers, each with dedicated 3-state enable (OE) control. Each channel transitions between active drive and high-impedance states based solely on its OE input level - no shared control logic or internal arbitration.
It supports TTL-level input thresholds (VIL = 0.8 V, VIH = 2.0 V) and drives standard TTL loads with VOL ≤ 0.55 V at IOL = 64 mA. Power-down ICCZ is limited to 14 mA max, and input clamp current is rated at −18 mA, enabling robust interface with legacy bus structures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with 5 V TTL and mixed-voltage bus systems without level-shifting. |
| IOL / IOH | 64 mA / −15 mA - sufficient to drive 10+ TTL loads per output, supporting dense bus loading. |
| tPLH / tPHL | ≤ 5.2 ns / ≤ 6.9 ns - enables reliable operation in sub-10 ns clock domains for memory and peripheral interfaces. |
| IOZH / IOZL | ±50 µA - guarantees low leakage in 3-state mode, preventing unintended bus contention or signal corruption. |
| ESD Protection | >2000 V HBM - meets MIL-STD-883C Method 3015, supporting handling in non-ESD-controlled assembly environments. |
| Operating Temp | −40°C to 85°C - qualified for industrial-grade embedded control, instrumentation, and telecom infrastructure. |
Pinout & Package
SN64BCT125AN uses a 14-pin plastic dual in-line package (PDIP-N), 300-mil width, through-hole mountable with 0.1-inch pin pitch. Pin 1 is marked by a notch or dot; pin 7 is GND, pin 14 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 5, 13 | Output Enable (1OE, 2OE, 3OE, 4OE) | Active-low control: high = high-Z output; critical for bus arbitration and hot-swap sequencing. |
| 2, 5, 10, 13 | Input (1A, 2A, 3A, 4A) | TTL-compatible inputs accepting 0.8 V/2.0 V thresholds; internally clamped to −18 mA. |
| 3, 6, 8, 11 | Output (1Y, 2Y, 3Y, 4Y) | Non-inverting buffered outputs capable of sourcing/sinking 64 mA; rail-to-rail swing under load. |
| 7 | GND | Power return reference for all logic and output stages; must be low-impedance for noise immunity. |
| 14 | VCC | 5 V supply input; decoupling capacitor required within 1 cm to suppress switching transients. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process | Reduces ICCZ to 6–14 mA vs. bipolar-only equivalents, lowering static power in idle bus segments. |
| Power-up/power-down high-Z | Prevents bus contention during system reset or brown-out; OE pins default inactive until powered. |
| Independent 3-state control | Each of four channels has dedicated OE, enabling selective bus segment isolation without global gating. |
| TTL-compatible interface | Accepts standard TTL input levels and drives TTL loads directly - no external level shifters required. |
| Robust ESD rating | Exceeds 2000 V HBM per MIL-STD-883C, reducing field failure risk in manual PCB handling and test. |
Applications
| Memory Address Buffering | Microprocessor Bus Isolation |
|---|---|
Use Scenario: Isolating CPU address lines from multiple memory banks to prevent capacitive loading and timing skew. IC Role / Device Role / Timing Role: Quad non-inverting buffer with per-channel 3-state control, placed between MPU address bus and bank-select decoders. Use Value: Enables dynamic bank selection with <5.2 ns propagation delay and zero bus contention during switching. |
Use Scenario: Separating shared data bus between microprocessor and peripheral controllers (e.g., UART, timer). IC Role / Device Role / Timing Role: Bidirectional bus driver with independent OE control per channel, used as unidirectional data path isolator. Use Value: Supports clean bus handoff with tPZL ≤ 7.3 ns and high-Z state maintained during processor interrupts. |
| Industrial I/O Expansion | Legacy System Bus Interface |
Use Scenario: Extending GPIO count on PLC mainboards by buffering parallel I/O port signals to remote modules. IC Role / Device Role / Timing Role: Level-shifting and drive-strengthening buffer for 5 V TTL I/O expansion backplanes. Use Value: Delivers 64 mA sink capability per output to drive LEDs, relays, or optocouplers without external transistors. |
Use Scenario: Interfacing modern controllers with vintage 1980s-era TTL-based instrumentation subsystems. IC Role / Device Role / Timing Role: Compatibility bridge ensuring signal integrity across mixed-generation bus architectures. Use Value: Matches legacy VIH/VIL thresholds and fanout requirements while adding power-cycle-safe high-Z behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffering applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74BCT244N | Octal (8-channel) version in same PDIP-20 package; higher pin count and identical VCC/IOL specs. | Used where full 8-bit bus buffering is needed instead of quad; requires PCB redesign due to different pinout and package size. | Select when expanding bus width beyond 4 lines; verify layout space and OE routing complexity. |
| SN64BCT125AD | Same functional spec, but in SOIC-14 (D) package; RoHS-compliant, MSL-1, surface-mount compatible. | Suitable for automated SMT assembly; not interchangeable with SN64BCT125AN without footprint change. | Choose for new designs targeting reflow assembly; retains identical timing, drive, and logic behavior. |
Compared with SN74BCT244N and SN64BCT125AD, the SN64BCT125AN offers through-hole PDIP-14 compatibility for prototyping and legacy repair, while maintaining identical electrical performance and BiCMOS efficiency - making it optimal for industrial field-service and mixed-technology board upgrades.
Availability
SN64BCT125AN is available at Aetrix Electronics and suitable for industrial control systems, legacy instrumentation interfaces, and microprocessor bus isolation requiring stable component supply across extended product lifecycles.
Supply support for SN64BCT125AN 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 solutions for industrial, automotive, and communications markets.
The SN64BCT125AN belongs to TI's BCT (Bipolar-CMOS Transistor) logic family, engineered for high-speed, low-power bus interface applications in mixed-technology systems where TTL compatibility and robust drive strength are essential.
FAQ
What is the operating voltage range for SN64BCT125AN?
The SN64BCT125AN operates over a supply voltage range of 4.5 V to 5.5 V, with recommended nominal VCC at 5 V. Absolute maximum VCC is 7 V, but sustained operation outside 4.5–5.5 V may compromise timing, drive strength, or reliability. The SN64BCT125AN is not rated for 3.3 V operation and requires a 5 V rail.
Does SN64BCT125AN support hot insertion or live bus swapping?
Yes - the SN64BCT125AN enters high-impedance state during power-up and power-down, preventing bus contention when inserted into a live system. Its OE inputs remain inactive until VCC stabilizes, and input/output clamping (−18 mA IIK, ±50 µA IOZ) protects against transient faults. This behavior is intrinsic to the SN64BCT125AN design and does not require external circuitry.
Can SN64BCT125AN drive standard TTL loads directly?
Yes - the SN64BCT125AN is fully TTL-compatible: it accepts standard TTL input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and delivers 64 mA sink current per output, sufficient to drive up to 10 standard TTL unit loads. No level-shifting or series termination is needed when interfacing with legacy TTL devices, including those in the SN74LS or SN74F families.
What is the thermal rating and packaging type of SN64BCT125AN?
The SN64BCT125AN is packaged in a 14-pin plastic dual in-line package (PDIP-N), rated for operation from −40°C to +85°C. It has no moisture sensitivity level (MSL) rating, as PDIP packages are not reflow-sensitive. The device is RoHS-compliant and carries NIPDAU lead finish, with part marking "SN64BCT125AN" laser-etched on the top surface.
How does SN64BCT125AN differ from SN74LS125 in practical use?
The SN64BCT125AN replaces SN74LS125 with significantly improved performance: it offers faster propagation (5.2 ns vs. ~15 ns), higher output drive (64 mA vs. 8 mA), lower ICCZ (14 mA vs. ~25 mA), and built-in power-cycle high-Z behavior. Unlike the LS variant, the SN64BCT125AN uses BiCMOS technology, eliminating TTL's inherent saturation delays and enabling cleaner bus switching in high-density systems.
SN64BCT125AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 64BCT
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- 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:
- 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-PDIP
SN64BCT125AN FAQ
1.How can I place an order for SN64BCT125AN through Aetrix?
Please submit a Request for Quotation (RFQ) for SN64BCT125AN 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 SN64BCT125AN reliable?
The price and inventory of SN64BCT125AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN64BCT125AN is usually 5 days.
3.What payment methods are accepted for SN64BCT125AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN64BCT125AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN64BCT125AN?
SN64BCT125AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN64BCT125AN 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 SN64BCT125AN?
For technical support, including SN64BCT125AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN64BCT125AN requirements.
6.How does Aetrix verify that SN64BCT125AN is sourced from the original manufacturer or authorized distributors?
All SN64BCT125AN 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 SN64BCT125AN meets industry standards.
7.What is the process for return or replacement of SN64BCT125AN?
All SN64BCT125AN units undergo pre-shipment inspection (PSI). If there is an issue with SN64BCT125AN, 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 SN64BCT125AN part is unused and in its original packaging.
Return procedure for SN64BCT125AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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