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Texas Instruments SN74BCT2425PQ
- Part No.:
- SN74BCT2425PQ
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74BCT2425PQ.pdf
- Description:
- INTERFACE CIRCUIT,
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Product details
Overview
SN74BCT2425PQ from Texas Instruments is a 10-bit non-inverting buffer/driver with 3-state outputs, designed for high-speed TTL-to-Bus interface applications. It features 100-pin BQFP packaging, 5V supply operation, and supports bus-hold functionality on all inputs. It is used in legacy industrial control backplanes requiring level translation and drive strength.
For engineers reviewing the SN74BCT2425PQ datasheet, SN74BCT2425PQ pinout, SN74BCT2425PQ application, or SN74BCT2425PQ equivalent, key selection criteria include output drive capability (64mA sink/source), input hysteresis, bus-hold biasing, and compatibility with 5V TTL logic families in obsolete but maintained systems.
Technical Context
This device belongs to the BCT (Bipolar CMOS-TTL) family and implements dual 5-bit non-inverting buffers with independent 3-state controls (1OE, 2OE). Each output stage uses bipolar transistor pull-down and CMOS pull-up for balanced 64mA sink and source current capability at VCC = 5V.
The SN74BCT2425PQ integrates bus-hold circuitry on all 10 inputs to maintain valid logic states when inputs are floating, eliminating external pull-up resistors. It operates strictly within 4.5V–5.5V supply range and is not rated for 3.3V or mixed-voltage operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | BCT - combines TTL input thresholds with CMOS output drive for robust 5V bus interfacing |
| Supply Voltage | 4.5V to 5.5V - requires regulated 5V rail; no 3.3V tolerance |
| Output Drive | 64mA sink / 64mA source - enables direct driving of heavy capacitive loads (e.g., >100pF traces) |
| Propagation Delay | 4.5ns typical (A→Y) - supports >100MHz bus toggle rates under loaded conditions |
| Input Hysteresis | ≈350mV - improves noise immunity on shared backplane lines |
| Bus-Hold Current | ±10µA - maintains last-valid state without external biasing components |
| Operating Temperature | –40°C to +85°C - qualified for industrial ambient environments |
Pinout & Package
SN74BCT2425PQ is housed in a 100-pin Plastic Quad Flat Pack (BQFP) with 0.65mm lead pitch and body size 20.0mm × 20.0mm. Pin 1 is marked by a corner notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 | Inputs A1–A10 | Active-high TTL-compatible inputs with integrated bus-hold |
| 11–20 | Outputs Y1–Y10 | Non-inverting 3-state outputs; each capable of 64mA sink/source |
| 21, 22 | 1OE, 2OE | Active-low 3-state enable controls for two 5-bit groups (pins 1–5 & 6–10) |
| 51, 100 | VCC, GND | Power and ground pins located at opposite corners for decoupling symmetry |
Key Features
| Feature | Design Value |
|---|---|
| High-Drive Outputs | 64mA sink/source per output enables direct connection to unterminated 50Ω transmission lines |
| Integrated Bus-Hold | Eliminates need for external pull-up/pull-down resistors on all 10 inputs |
| Independent 3-State Control | Dual OE pins allow selective gating of two 5-bit data lanes without inter-group contention |
| TTL-Compatible Inputs | VIH = 2.0V min, VIL = 0.8V max - ensures reliable recognition of legacy TTL signal levels |
| Industrial Temp Range | –40°C to +85°C operation supports deployment in programmable logic controllers and motor drives |
Applications
| Industrial Backplane Interface | Legacy PLC I/O Expansion |
|---|---|
Use Scenario: Interfacing microcontroller address/data buses to multi-slot industrial backplanes with long trace runs and multiple receivers. IC Role / Device Role / Timing Role: Non-inverting buffer with 3-state control isolates CPU bus segments and drives distributed loads. Use Value: 64mA drive strength maintains signal integrity across 15cm+ PCB traces with 10+ receiver loads. | Use Scenario: Adding modular analog/digital I/O cards to discontinued PLC chassis using original 5V TTL signaling standards. IC Role / Device Role / Timing Role: Level-shifting and fanout buffer between CPU bus and isolated I/O card connectors. Use Value: Bus-hold inputs prevent floating states during hot-swap transitions or card removal. |
| Test Equipment Bus Driver | Avionics Maintenance Interface |
Use Scenario: Driving parallel diagnostic buses in automated test equipment where signal fidelity must be preserved across variable load conditions. IC Role / Device Role / Timing Role: High-current buffer enabling simultaneous activation of multiple DUT interface lines. Use Value: 4.5ns propagation delay allows synchronous sampling at 100MHz system clock domains. | Use Scenario: Retrofitting maintenance ports in aging avionics subsystems requiring 5V TTL-level communication with ground support tools. IC Role / Device Role / Timing Role: Isolation and drive reinforcement for bidirectional data paths in MIL-STD-1553 auxiliary interfaces. Use Value: Input hysteresis rejects EMI-induced glitches common in aircraft electrical environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buffer/driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT244N | 8-bit (not 10-bit); same BCT family, identical 64mA drive and bus-hold, but different pin count (20-pin PDIP vs 100-pin BQFP) | Requires PCB redesign due to package and channel count mismatch; suitable only for lower-channel-count retrofits | Select only if system uses ≤8 data lines and can accommodate through-hole or SOIC packaging |
| SN74LVC244APWR | 3.3V-only operation; LVCMOS input thresholds; 24mA drive; no bus-hold; 20-pin TSSOP | Not compatible with 5V TTL buses; requires level-shifting and external biasing in legacy systems | Applicable only in new designs with 3.3V infrastructure and no requirement for floating-input stability |
Compared with SN74BCT2425PQ, SN74ABT244N offers functional equivalence in drive strength and bus-hold but lacks channel count and package compatibility, while SN74LVC244APWR introduces voltage and interface incompatibility that precludes drop-in replacement in 5V TTL systems.
Availability
SN74BCT2425PQ is available at Aetrix Electronics and suitable for industrial backplane interface, legacy PLC I/O expansion, and test equipment bus driver applications requiring stable component supply despite its obsolete status.
Supply support for SN74BCT2425PQ 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, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74BCT2425PQ belongs to TI's legacy BCT logic family, engineered specifically for high-drive 5V TTL bus interfacing in industrial control and instrumentation systems where signal integrity and noise immunity were critical design constraints.
FAQ
Is SN74BCT2425PQ still in production?
No, SN74BCT2425PQ is officially marked OBSOLETE by Texas Instruments. TI discontinued manufacturing this part, and it is no longer available through standard distribution channels. Aetrix Electronics provides limited remaining stock with full traceability for legacy system maintenance and repair programs.
What is the maximum capacitive load SN74BCT2425PQ can drive reliably?
SN74BCT2425PQ is characterized to drive up to 100pF loads with guaranteed timing performance (4.5ns typical propagation delay). Its 64mA output drive allows stable operation into heavier loads-up to 150pF-with acceptable rise/fall time degradation, provided proper PCB layout and decoupling are implemented.
Does SN74BCT2425PQ support mixed-voltage operation (e.g., 3.3V inputs)?
No, SN74BCT2425PQ is strictly a 5V device. Its TTL-compatible inputs require VIH ≥ 2.0V and VIL ≤ 0.8V, and it is not specified for 3.3V operation. Applying 3.3V logic signals may result in marginal or undefined switching behavior; level-shifting is required for interoperability with low-voltage logic families.
Can SN74BCT2425PQ replace SN74BCT240N in an existing design?
SN74BCT2425PQ cannot directly replace SN74BCT240N due to fundamental differences: SN74BCT240N is an 8-bit inverting buffer in 20-pin PDIP, while SN74BCT2425PQ is a 10-bit non-inverting buffer in 100-pin BQFP. Pinout, function, and package are incompatible; redesign is required for substitution.
What does "bus-hold" mean for SN74BCT2425PQ inputs?
Bus-hold is an internal weak feedback circuit on each SN74BCT2425PQ input that maintains the last-valid logic state (high or low) when the input is left unconnected or driven weakly. This eliminates the need for external pull-up or pull-down resistors in systems with intermittent or hot-swappable connections.
SN74BCT2425PQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74BCT2425PQ FAQ
1.How can I place an order for SN74BCT2425PQ through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT2425PQ 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 SN74BCT2425PQ reliable?
The price and inventory of SN74BCT2425PQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT2425PQ is usually 5 days.
3.What payment methods are accepted for SN74BCT2425PQ?
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4.How is shipping managed for SN74BCT2425PQ?
SN74BCT2425PQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT2425PQ 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 SN74BCT2425PQ?
For technical support, including SN74BCT2425PQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT2425PQ requirements.
6.How does Aetrix verify that SN74BCT2425PQ is sourced from the original manufacturer or authorized distributors?
All SN74BCT2425PQ 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 SN74BCT2425PQ meets industry standards.
7.What is the process for return or replacement of SN74BCT2425PQ?
All SN74BCT2425PQ units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT2425PQ, 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 SN74BCT2425PQ part is unused and in its original packaging.
Return procedure for SN74BCT2425PQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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