SN74LVC244QAPWRQ1 - Auto 8-Bit 3-State Buffer | TI
料号： SN74LVC244QAPWRQ1 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.52 | $0.52 |
| 10 | $0.47 | $4.70 |
| 100 | $0.38 | $38.00 |
| 500 | $0.31 | $155.00 |
| 1,000 | $0.26 | $260.00 |
SN74LVC244QAPWRQ1 概述
An octal buffer is a digital logic device that strengthens (buffers) eight signal lines at once, providing higher output drive and isolation between a controller and a load. Within the logic hierarchy, it belongs to the buffer/driver family of CMOS logic ICs, positioned above single-gate buffers and below bus transceivers, which add bidirectional capability.
Key features include fully 3-state outputs for shared-bus connections, individual OE control for each 4-bit half, LVC-family CMOS technology supporting partial-power-down operation with Ioff protection, and an operating temperature range of -40C to +125C suitable for automotive and industrial environments. According to the TI SN74LVC244A-Q1 datasheet (Rev. D), the device performs the non-inverting buffer function Y = A for each channel.
The LVC process provides low quiescent current, TTL-compatible input thresholds at 3.3 V operation, and balanced output drive for typical 24 mA-class loads at 3.3 V, making it suitable for address/data bus driving, clock distribution, and level-stable signal buffering between a microcontroller and peripherals.
Typical applications include automotive body control modules, gateways and infotainment buses, industrial PLC I/O isolation, and memory or peripheral chip-select driving in embedded systems.
Design tip: tie unused OE inputs to VCC through a pull-up resistor so outputs stay in the high-impedance state during power-up, and decouple the VCC pin with a 0.1 uF ceramic capacitor placed within 2 mm of the pin to suppress transient currents during simultaneous switching.
直接替换替代料： SN74LVC244QAPWRQ1 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： SN74LVC244QAPWRQ1 （相同外形与封装尺寸） ——差异在于 Output Enable, Output Type, Package, Bits per Element, Function.
快速对比工具——选择替代料号进行并排对比：
SN74LVC244AQPWRQ1
✅ 直接替换📋 参考替代料（不在目录中）
SN74LVC244APWR
✅ 直接替换✓ 有现货
$0.21 / 个
查看数据手册 →SN74LVC244APWLE
✅ 直接替换📋 参考替代料（不在目录中）
CLVC244AQPWRG4Q1
✅ 直接替换📋 参考替代料（不在目录中）
74LVC244APW,118
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
74ALVC244PW,118
✅ 直接替换📋 参考替代料（不在目录中）
SN74LVC244QAPWRQ1 最大额定值与电气特性
| Logic Function | Octal buffer/driver, non-inverting, 3-state |
| Bits per Element | 2 elements x 4 bit (8 total) |
| Supply Voltage Range | 1.65 V to 3.6 V |
| 输出类型 | 3-State, non-inverting |
| Output Enable | 2 independent OE inputs (one per 4-bit section) |
| 工作温度 | -40C to +125C |
| Qualification | AEC-Q100 automotive grade |
| Technology | LVC CMOS |
| Input Type | CMOS/TTL-compatible |
| 安装类型 | Surface Mount |
| 封装 | 20-TSSOP (PW) |
| Packing | Tape & Reel |
| RoHS 状态 | Compliant |
| Series | 74LVC (LVC-Q1) |
SN74LVC244QAPWRQ1 引脚配置
| 引脚 1 | OE1 — Output enable 1 (low = outputs active) |
| 引脚 2 | 1A1 — Data input A1 |
| 引脚 3 | 2Y4 — 3-state output Y4 of section 2 |
| 引脚 4 | 1A2 — Data input A2 |
| 引脚 5 | 2Y3 — 3-state output Y3 of section 2 |
| 引脚 6 | 1A3 — Data input A3 |
| 引脚 7 | 2Y2 — 3-state output Y2 of section 2 |
| 引脚 8 | 1A4 — Data input A4 |
| 引脚 9 | 2Y1 — 3-state output Y1 of section 2 |
| 引脚 10 | GND — Ground |
| 引脚 11 | 2A1 — Data input A1 of section 2 |
| 引脚 12 | 1Y4 — 3-state output Y4 of section 1 |
| 引脚 13 | 2A2 — Data input A2 of section 2 |
| 引脚 14 | 1Y3 — 3-state output Y3 of section 1 |
| 引脚 15 | 2A3 — Data input A3 of section 2 |
| 引脚 16 | 1Y2 — 3-state output Y2 of section 1 |
| 引脚 17 | 2A4 — Data input A4 of section 2 |
| 引脚 18 | 1Y1 — 3-state output Y1 of section 1 |
| 引脚 19 | OE2 — Output enable 2 (low = outputs active) |
| 引脚 20 | VCC — Power supply, 1.65 V to 3.6 V |
典型应用
SN74LVC244QAPWRQ1 适用于 6 应用s: Automotive Body Control Module, Industrial PLC I/O Buffering, Automotive Gateway Module, Infotainment Display Control, Battery Management System, Test and Measurement Instrumentation.
Automotive Body Control Module
In automotive body control modules, the SN74LVC244QAPWRQ1 buffers GPIO outputs from the microcontroller driving relays, lamps, and door actuators. Its AEC-Q100 qualification and -40C to +125C range guarantee reliability across harsh under-hood and cabin environments. The 3-state outputs let multiple modules share diagnostic bus lines, while Ioff partial-power-down protection prevents back-powering the MCU rail during sleep modes, preserving quiescent-current budgets critical for battery drain compliance.
推荐
Industrial PLC I/O Buffering
In programmable logic controllers, the SN74LVC244QAPWRQ1 strengthens 3.3 V MCU signals before they drive opto-isolators or line receivers on the I/O backplane. The wide -40C to +125C rating suits unconditioned industrial cabinets, and the two independent OE pins allow one half of the buffer to be tri-stated during configuration while the other remains active. At 3.3 V the LVC CMOS technology delivers low quiescent current, reducing heat inside sealed enclosures with passive cooling.
推荐
Automotive Gateway Module
Gateway modules that bridge CAN, LIN, and Ethernet domains use the SN74LVC244QAPWRQ1 to buffer chip-select, interrupt, and reset lines between host processors and network transceivers. The octal organization covers a full byte-width control bus in one TSSOP-20 footprint, and 3-state outputs permit sharing boot-configuration straps between the MCU and JTAG/debug connectors. According to TI datasheet Rev. D, the device maintains 3-state outputs across the full 1.65 V to 3.6 V VCC range, simplifying multi-rail designs.
推荐
Infotainment Display Control
Head-unit and cluster display boards use the SN74LVC244QAPWRQ1 to buffer backlight enable, panel reset, and fan-control signals from the graphics SoC. Because display boards mix 1.8 V, 3.3 V, and 5 V domains, the 3-state outputs allow shared control lines to be released during boot until the SoC firmware claims them. The AEC-Q100 rating covers the elevated ambient temperatures inside sealed dashboards, where 85C-rated commercial parts would lose margin.
推荐
Battery Management System
In BMS slave boards, the SN74LVC244QAPWRQ1 buffers cell-monitor chip-select and balance-control signals from the pack controller. Its Ioff circuitry ensures the buffer does not leak current into the MCU rail when the section is powered down for low-power standby, protecting the precision of pack-current leakage measurements. The -40C to +125C range covers cell-contact environments, and the TSSOP-20 package fits the dense stacked PCBs typical of module-level BMS designs.
推荐
Test and Measurement Instrumentation
Bench instruments and automated test equipment use the SN74LVC244QAPWRQ1 to buffer relay-drive and multiplexer-select lines from a controller FPGA or MCU. The 3-state outputs let multiple controller cards share a common backplane signal set without bus contention, and pin-for-pin LVC244 interchangeability across TI, NXP, and TI commercial grades simplifies sourcing during supply disruptions. Low propagation delay at 3.3 V keeps control timing deterministic across channel counts.
推荐
推荐产品汇总
工程参考数据： SN74LVC244QAPWRQ1 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | SN74LVC244AQPWRQ1 | SN74LVC244APWR | 74LVC244APW,118 | 74ALVC244PW,118 |
|---|---|---|---|---|---|
| Package | 20-TSSOP (PW) | 20-TSSOP (PW) - same | 20-TSSOP (PW) - same | 20-TSSOP (SOT360-1) - same footprint | 20-TSSOP (SOT360-1) - same footprint |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | NXP Semiconductors | NXP Semiconductors |
| Supply Voltage | 1.65 V to 3.6 V | 1.65 V to 3.6 V | 1.65 V to 3.6 V | 1.65 V to 3.6 V | 1.65 V to 3.6 V |
| AEC-Q100 Qualified | Yes | Yes | No | No (standard grade) | No (standard grade) |
| Output Type | 3-State, non-inverting | 3-State, non-inverting | 3-State, non-inverting | 3-State, non-inverting | 3-State, non-inverting |
| Output Enable | 2 independent OE pins | 2 OE pins | 2 OE pins | 2 OE pins | 2 OE pins |
关键差异点
- AEC-Q100 automotive qualification （对比 SN74LVC244APWR)
- Same footprint as standard grade （对比 SN74LVC244APWLE)
- Second-source availability （对比 74LVC244APW,118)
设计说明
Decouple VCC (pin 20) with a 0.1 uF ceramic capacitor placed within 2 mm of the pin, plus a bulk 4.7 uF capacitor per octal buffer cluster. Simultaneous switching of eight outputs causes transient supply currents; insufficient decoupling shows up as glitches on neighboring logic. Per TI CMOS logic application guidance, keep the ground return path short and use a solid ground plane.
OE pins must never float. During power-up, undriven OE can leave outputs in an indeterminate state, causing bus contention on shared lines. Use a 10 k-ohm pull-up to VCC on both OE1 and OE2 so outputs default to 3-state, then drive OE low from firmware once VCC and the bus are stable. Also confirm unused inputs are tied to VCC or GND, not left floating, per standard CMOS practice.
LVC buffers dissipate negligible power at moderate switching rates, but at heavy capacitive loads (for example, eight outputs driving 100 pF each at 50 MHz) dynamic power P = C*V^2*f can approach several hundred milliwatts. The TSSOP-20 theta_JA is roughly 100 C/W, so verify junction temperature stays below 125C in high-switching-rate designs; a short ground pour under the package provides adequate spreading.
合规信息
AEC-Q100 qualification per TI SN74LVC244A-Q1 datasheet Rev. D. RoHS compliance per standard TI 74LVC-Q1 offering; REACH and halogen details not stated in provided data.
