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Texas Instruments SN64BCT126ANG4
- Part No.:
- SN64BCT126ANG4
- Manufacturer:
- Texas Instruments
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
SN64BCT126ANG4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,103
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Product details
Overview
SN64BCT126ANG4 from Texas Instruments is a quadruple bus buffer gate with 3-state outputs, designed for bidirectional data bus isolation and address register buffering in 5-V TTL/CMOS systems. It features independent line drivers, high-impedance state during power-up/down, ESD protection >2000 V, and operates across –40°C to 85°C.
For engineers reviewing the SN64BCT126ANG4 datasheet, SN64BCT126ANG4 pinout, SN64BCT126ANG4 application, or SN64BCT126ANG4 equivalent, key selection criteria include 3-state output timing (tPLH ≤ 4.9 ns), low ICCZ (5–10 mA), IOL = 64 mA drive capability, and compatibility with standard 14-pin plastic DIP (N package) layouts.
Technical Context
The SN64BCT126ANG4 implements a BiCMOS architecture to reduce quiescent current (ICCZ) while maintaining TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V) and CMOS-level output swing (VOH ≥ 2.4 V at IOH = –3 mA). Each of its four channels operates independently with dedicated OE and A inputs controlling Y output state.
Its 3-state control logic ensures outputs enter high-impedance (Z) when OE is low, enabling bus sharing without contention. The device maintains safe high-Z behavior during power sequencing-ICL and IOZ values remain within 50 µA over VCC ramp conditions-making it suitable for hot-swap-capable backplane interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures robust operation under noisy 5-V supply rails with ±10% tolerance. |
| IOL / IOH | 64 mA / –15 mA - Supports direct driving of multiple TTL loads or termination-resistor networks. |
| tPLH / tPHL | 1.5–4.9 ns / 2.7–6.9 ns - Enables sub-7 ns propagation delay for high-speed address/data buffering up to ~100 MHz. |
| IOZ (High-Z leakage) | ±50 µA - Minimizes bus loading when outputs are disabled, critical for multi-drop bus integrity. |
| ESD Rating | >2000 V HBM - Meets MIL-STD-883 Method 3015, supporting handling in non-ESD-controlled assembly environments. |
| Operating Temp | –40°C to 85°C - Qualified for industrial-grade embedded control and instrumentation applications. |
| Input Capacitance | 4 pF - Low capacitive loading preserves signal edge rate on shared control lines like OE. |
Pinout & Package
SN64BCT126ANG4 is supplied in a 14-pin plastic dual in-line package (PDIP), designated N package per TI documentation. Pin spacing is 0.300 inch (7.62 mm), with standard through-hole mounting footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 9, 12 | OE (Output Enable) | Active-low control per channel; asserts high-impedance state on corresponding Y output when low. |
| 2, 5, 10, 13 | A (Data Input) | Non-inverting input for each buffer channel; drives Y output when OE is high. |
| 3, 6, 8, 11 | Y (3-State Output) | Buffered, totem-pole output; high-impedance when OE = L, otherwise follows A logic level. |
| 7 | GND | Ground reference for all internal circuitry and output stage return path. |
| 14 | VCC | Positive supply rail (4.5–5.5 V); powers BiCMOS output drivers and input buffers. |
Key Features
| Feature | Design Value |
|---|---|
| State-of-the-art BiCMOS design | Reduces ICCZ to 5–10 mA versus 30+ mA in legacy bipolar buffers, lowering system power and thermal load. |
| High-impedance during power-up/down | Guarantees bus-safe startup/shutdown via internal power-on reset logic-no external pull-ups required on OE or Y lines. |
| Independent 3-state control per channel | Enables selective bus partitioning: e.g., isolate memory address lines while keeping data lines active. |
| TTL-compatible input thresholds | VIL ≤ 0.8 V and VIH ≥ 2.0 V ensure reliable interfacing with legacy 5-V microcontrollers and FPGAs without level shifters. |
| Low output capacitance (Co = 9 pF) | Maintains fast edge rates on loaded buses, reducing signal distortion and timing margin loss in parallel interconnects. |
Applications
| Memory Address Buffering | Microcontroller Bus Isolation |
|---|---|
Use Scenario: Buffering 16-bit address bus between microcontroller and SRAM/ROM to prevent loading and timing skew. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing fan-out gain and bus contention prevention during DMA cycles. Use Value: Delivers 64 mA sink current per output to drive heavy capacitive loads while maintaining <7 ns propagation delay for cycle-accurate addressing. | Use Scenario: Isolating peripheral I/O expansion bus (e.g., GPIO port expanders) from main CPU bus during reset or firmware update. IC Role / Device Role / Timing Role: Directionally agnostic bus gate enabling safe hot-plug of add-on modules without disrupting CPU operation. Use Value: High-impedance state activation during power transitions eliminates bus contention and prevents spurious writes to peripherals. |
| Industrial Backplane Interface | Legacy System Signal Conditioning |
Use Scenario: Interfacing multiple 5-V logic cards on a shared backplane where signal integrity and fault containment are critical. IC Role / Device Role / Timing Role: Channelized bus driver with per-line enable, allowing dynamic reconfiguration of bus segments. Use Value: ±50 µA high-Z leakage ensures minimal crosstalk between powered-down slots, preserving noise margins in electrically noisy factory environments. | Use Scenario: Upgrading aging test equipment with mixed-voltage subsystems (TTL + CMOS) requiring clean signal translation. IC Role / Device Role / Timing Role: Level-consistent repeater that restores logic levels and drive strength without introducing inversion or delay skew. Use Value: 4 pF input capacitance and 9 pF output capacitance minimize jitter accumulation across cascaded stages in precision timing paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74BCT244N | Octal (8-channel) version with identical VCC range, timing, and BiCMOS process; same N-package pinout but different pin assignment. | Requires PCB redesign due to doubled channel count and relocated OE pins; suited for wider buses needing more drivers. | Select when expanding from 4- to 8-bit bus width and board layout allows pinout revision. |
| SN64BCT125ANG4 | Same quad 3-state buffer but with inverting outputs (Y = NOT A); otherwise identical electrical specs and package. | Not interchangeable without logic inversion in upstream/downstream circuitry; requires functional verification of signal polarity. | Choose only if system design explicitly requires inverted buffering-otherwise avoid due to functional mismatch. |
Compared with SN74BCT244N and SN64BCT125ANG4, the SN64BCT126ANG4 provides optimal balance of channel count, non-inverting logic, and drop-in compatibility in existing 14-pin DIP footprints-making it ideal for targeted upgrades and space-constrained industrial control boards.
Availability
SN64BCT126ANG4 is available at Aetrix Electronics and suitable for memory address buffering, microcontroller bus isolation, and industrial backplane interface applications requiring stable component supply and long-term industrial temperature support.
Supply support for SN64BCT126ANG4 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The SN64BCT126ANG4 belongs to TI's legacy BCT (Bipolar-CMOS Transceiver) logic family, engineered specifically for high-drive, low-noise 5-V bus interfacing in industrial control and instrumentation systems.
FAQ
What is the operating temperature range for SN64BCT126ANG4?
The SN64BCT126ANG4 is characterized for operation from –40°C to 85°C, meeting industrial-grade environmental requirements. This rating is confirmed in the "recommended operating conditions" table of the official TI datasheet SCBS051C, and applies specifically to the NG4 variant in the N-package configuration.
Does SN64BCT126ANG4 support 3.3-V logic inputs?
No, SN64BCT126ANG4 does not reliably support 3.3-V logic inputs. Its input thresholds are TTL-compatible: VIH ≥ 2.0 V minimum and VIL ≤ 0.8 V maximum. While a 3.3-V high may exceed VIH, marginal noise margins and undefined behavior below VIL make direct 3.3-V interface unsafe without level translation.
What is the maximum output current capability of SN64BCT126ANG4?
The SN64BCT126ANG4 supports a maximum low-level output current (IOL) of 64 mA per channel, verified under VCC = 4.5 V and VOL ≤ 0.55 V. This enables direct driving of multiple TTL loads or termination resistors without external buffers.
Is SN64BCT126ANG4 pin-compatible with SN74LS126N?
No, SN64BCT126ANG4 is not pin-compatible with SN74LS126N. Although both are quad 3-state buffers in 14-pin DIP packages, their pin assignments differ: SN64BCT126ANG4 places OE on pins 1/4/9/12, whereas SN74LS126N uses pins 1/3/4/5 for OE. PCB layout changes are required for substitution.
What packaging type does SN64BCT126ANG4 use?
SN64BCT126ANG4 uses a 14-pin plastic dual in-line package (PDIP), designated as the N package by Texas Instruments. This through-hole package has 0.300-inch lead spacing and is RoHS-compliant with green (halogen-free) molding compound.
SN64BCT126ANG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 64BCT
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
SN64BCT126ANG4 FAQ
1.How can I place an order for SN64BCT126ANG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN64BCT126ANG4 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 SN64BCT126ANG4 reliable?
The price and inventory of SN64BCT126ANG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN64BCT126ANG4 is usually 5 days.
3.What payment methods are accepted for SN64BCT126ANG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN64BCT126ANG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN64BCT126ANG4?
SN64BCT126ANG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN64BCT126ANG4 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 SN64BCT126ANG4?
For technical support, including SN64BCT126ANG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN64BCT126ANG4 requirements.
6.How does Aetrix verify that SN64BCT126ANG4 is sourced from the original manufacturer or authorized distributors?
All SN64BCT126ANG4 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 SN64BCT126ANG4 meets industry standards.
7.What is the process for return or replacement of SN64BCT126ANG4?
All SN64BCT126ANG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN64BCT126ANG4, 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 SN64BCT126ANG4 part is unused and in its original packaging.
Return procedure for SN64BCT126ANG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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