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Texas Instruments SN74BCT757DWR
- Part No.:
- SN74BCT757DWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74BCT757DWR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,008
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Product details
Overview
SN74BCT757DWR from Texas Instruments is an octal noninverting buffer/driver with open-collector outputs, designed for memory address driving and bus interfacing in 5-V TTL-compatible systems. It features complementary output-enable inputs (1OE and 2OE), BiCMOS logic for low ICCZ, 64 mA sink capability per output, and operation across 0°C to 70°C.
For engineers reviewing the SN74BCT757DWR datasheet, SN74BCT757DWR pinout, SN74BCT757DWR application, or SN74BCT757DWR equivalent, key selection criteria include open-collector drive strength, dual enable control, SOIC-20 thermal and layout compatibility, and legacy TTL bus interface requirements.
Technical Context
The SN74BCT757DWR implements a dual-rail BiCMOS architecture that combines bipolar input stages with CMOS output drivers to achieve high-speed switching (tPHL down to 2 ns) while minimizing quiescent current (ICCZ ≤ 10 mA). Its open-collector outputs require external pull-up resistors and support wired-AND logic and level translation.
It provides two independent 4-bit sections-each with dedicated enable (1OE/2OE) and noninverting data paths (A→Y)-allowing selective activation of eight outputs. The device lacks internal termination or slew-rate control, requiring external design attention for signal integrity on shared buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply Range | 4.5 V to 5.5 V - Ensures stable operation within standard 5-V TTL power rails; not rated for 3.3-V or mixed-voltage use. |
| IOL Sink Current | 64 mA per output - Supports direct connection to 5-V bus lines with typical 330 Ω–1 kΩ pull-ups without external buffers. |
| tPHL / tPLH | 2.4 ns / 6.9 ns (A→Y at VCC = 5 V) - Enables sub-10 ns propagation for high-speed address buffering in legacy memory subsystems. |
| Input Voltage Thresholds | VIL = 0.8 V, VIH = 2.0 V - Fully compatible with standard TTL logic families; no level-shifting needed for 74LS/74F sources. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial-grade applications only; not suitable for extended industrial or automotive environments. |
| ESD Protection | >2000 V HBM, >200 V MM - Meets MIL-STD-883C Class 3015; sufficient for board-level handling but not system-level ESD immunity. |
Pinout & Package
SN74BCT757DWR is housed in a 20-pin SOIC (DW) package, 7.5 mm wide, 12.83 mm long, with 1.27 mm pitch and 2.65 mm max height. RoHS-compliant, NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low enables for first and second 4-bit sections; both must be low to activate respective outputs. |
| 2, 4, 6, 8 | 1A1–1A4 | Noninverting inputs for section 1; drive corresponding Y outputs when 1OE = L. |
| 11, 13, 15, 17 | 2A1–2A4 | Noninverting inputs for section 2; drive corresponding Y outputs when 2OE = L. |
| 12, 14, 16, 18 | 1Y1–1Y4 | Open-collector outputs for section 1; sink current only; require external pull-up. |
| 3, 5, 7, 9 | 2Y1–2Y4 | Open-collector outputs for section 2; electrically isolated from section 1 outputs. |
| 10 | GND | Ground reference for all logic and output stages; must be low-impedance for noise-sensitive bus driving. |
| 20 | VCC | Positive supply rail; decoupling capacitor (0.1 µF ceramic) required adjacent to pin 20. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Reduces ICCZ to ≤10 mA (vs. >30 mA in pure bipolar equivalents), lowering system power in idle bus states. |
| Dual independent 4-bit sections | Enables partial bus gating-e.g., enabling only address bits A0–A3 while holding A4–A7 inactive-reducing contention and noise. |
| Open-collector outputs | Supports wired-AND arbitration, multi-source bus sharing, and 5-V tolerant pull-up to higher voltages (≤5.5 V). |
| TTL-compatible input thresholds | Accepts standard 74LS, 74F, and microcontroller GPIO outputs directly-no level translators required. |
| SOIC-20 footprint | Matches JEDEC MS-013; compatible with automated placement and reflow; supports 25-unit tube packaging for production use. |
Applications
| Memory Address Buffering | Legacy Bus Transceiver Interface |
|---|---|
|
Use Scenario: Driving 20-bit address bus between microprocessor and SRAM/ROM in industrial control PLCs. IC Role / Device Role / Timing Role: Noninverting octal buffer providing fanout and noise margin; open-collector outputs allow shared bus arbitration with other peripherals. Use Value: 64 mA sink per output ensures reliable low-state voltage (<0.55 V) under full bus loading, preventing address decoding errors. |
Use Scenario: Interfacing Z80 or 8086 CPU data/address buses to peripheral I/O chips via shared control lines. IC Role / Device Role / Timing Role: Dual-section driver enabling selective activation of address latches and I/O port buffers using separate OE controls. Use Value: Independent 1OE/2OE pins eliminate need for external logic gates to gate subsets of bus lines, simplifying PCB routing. |
| EPROM Programming Support | Industrial Backplane Signal Conditioning |
|
Use Scenario: Buffering address and control signals during EPROM programming cycles where bus contention must be avoided. IC Role / Device Role / Timing Role: High-speed (2.4 ns tPHL) noninverting driver isolating programmer from target system during write operations. Use Value: Sub-10 ns propagation ensures setup/hold timing margins are preserved even at maximum 5-MHz programming clock rates. |
Use Scenario: Driving parallel status/control lines across 100-mm backplane traces in test equipment rack systems. IC Role / Device Role / Timing Role: Open-collector output stage allows series termination and controlled edge rates via external RC networks. Use Value: Low output capacitance (Co = 4 pF) minimizes trace ringing and improves signal fidelity over long interconnects. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal open-collector buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS757N | Lower IOL (24 mA), higher ICCZ (25 mA), same SOIC/PDIP packages; TTL-only (no BiCMOS). | Limited to lighter bus loads; unsuitable for high-current or low-power-idle designs. | Choose only if cost sensitivity outweighs performance and power requirements. |
| SN74F757N | Faster tPHL (1.5 ns), higher ICCZ (40 mA), same pinout; no BiCMOS; requires tighter decoupling. | Better for ultra-high-speed timing-critical paths but increases system power and noise. | Select when propagation delay is primary constraint and thermal/power budgets allow. |
Compared with SN74ALS757N and SN74F757N, the SN74BCT757DWR delivers optimal balance of speed (2.4 ns tPHL), drive strength (64 mA), and quiescent efficiency (10 mA ICCZ), making it the preferred choice for modern retro-designs and legacy system upgrades where reliability and thermal headroom matter.
Availability
SN74BCT757DWR is available at Aetrix Electronics and suitable for memory address buffering, legacy bus interfacing, EPROM programming support, and industrial backplane signal conditioning requiring stable component supply and long-term obsolescence management.
Supply support for SN74BCT757DWR 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 founded in 1930, delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74BCT757DWR belongs to TI's legacy BCT (Bipolar-CMOS Transistor) logic family, engineered specifically to replace high-power 74S/74F buffers in memory and bus systems while reducing power consumption and improving noise immunity.
FAQ
What is the maximum sink current per output of the SN74BCT757DWR?
The SN74BCT757DWR supports up to 64 mA of low-level output current (IOL) per open-collector output when VCC = 4.5 V and VOL ≤ 0.55 V. This rating is validated across the full operating temperature range (0°C to 70°C) and defines the maximum load the SN74BCT757DWR can reliably drive to logic low without exceeding specified voltage thresholds.
Does the SN74BCT757DWR support 3.3-V input logic levels?
No-the SN74BCT757DWR has TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and is designed for 5-V systems. While a 3.3-V high may exceed VIL, it falls below the guaranteed VIH minimum; thus, direct connection to 3.3-V logic sources risks unreliable switching and is not recommended without level translation.
Can the SN74BCT757DWR be used with pull-up resistors to voltages higher than 5 V?
Yes-the SN74BCT757DWR's open-collector outputs tolerate VO up to 5.5 V in the high state (per absolute maximum ratings), allowing safe use with pull-ups to +5.5 V. However, the device itself must be powered at VCC = 4.5–5.5 V; higher pull-up voltages do not extend VCC limits.
What is the function of pins 1 and 19 on the SN74BCT757DWR?
Pins 1 and 19 are the active-low output-enable inputs 1OE and 2OE, respectively. When pulled low, they enable the corresponding 4-bit section (1A1–1A4 → 1Y1–1Y4 or 2A1–2A4 → 2Y1–2Y4); when high, those outputs enter high-impedance (open-collector off) state. Both controls operate independently on the SN74BCT757DWR.
Is the SN74BCT757DWR RoHS compliant and what is its moisture sensitivity level?
Yes-the SN74BCT757DWR is RoHS compliant with NIPDAU lead finish and carries an MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH), meaning it can be stored indefinitely before reflow without baking. This applies to the DW package variant as documented in TI's official packaging addendum.
SN74BCT757DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- Open Collector
- Current - Output High, Low:
- -, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74BCT757DWR FAQ
1.How can I place an order for SN74BCT757DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT757DWR 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 SN74BCT757DWR reliable?
The price and inventory of SN74BCT757DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT757DWR is usually 5 days.
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SN74BCT757DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT757DWR 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 SN74BCT757DWR?
For technical support, including SN74BCT757DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT757DWR requirements.
6.How does Aetrix verify that SN74BCT757DWR is sourced from the original manufacturer or authorized distributors?
All SN74BCT757DWR 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 SN74BCT757DWR meets industry standards.
7.What is the process for return or replacement of SN74BCT757DWR?
All SN74BCT757DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT757DWR, 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 SN74BCT757DWR part is unused and in its original packaging.
Return procedure for SN74BCT757DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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