74LVC4245ABQ+118 - Octal Dual-Supply Translating Transceiver | Nexperia
부품 번호: 74LVC4245ABQ+118 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $0.95 | $0.95 |
| 10 | $0.85 | $8.50 |
| 100 | $0.72 | $72.00 |
| 500 | $0.58 | $290.00 |
| 1,000 | $0.46 | $460.00 |
| 2,500 | $0.39 | $975.00 |
74LVC4245ABQ+118 개요
A voltage level translator is an interface IC that allows logic signals crossing different supply domains to communicate without damage or signal integrity loss. Within the broader hierarchy, the 74LVC4245A sits inside the bus transceiver family, which is itself part of the logic IC category, under the umbrella of interface ICs and integrated circuits. The "dual supply" qualifier means the IC carries two independent VCC rails: a 5 V rail (VCC(5V)) on the B-side and a 3.3 V rail (VCC(3V)) on the A-side. This dual-rail topology is the cornerstone feature that enables transparent translation between legacy 5 V peripherals and modern 3.3 V processors, FPGAs, and ASICs.
Key features include eight bidirectional channels, ±24 mA output drive on the B-side, low-power CMOS construction, and an operating temperature range from -40 °C to +125 °C. The device accepts input voltages up to 5.5 V on the 5 V side while being powered by a 3.3 V rail, and it supports 3-state outputs that isolate either bus when disabled. The exposed-pad DHVQFN-24 package provides low thermal resistance, supporting sustained heavy drive loads without derating.
Technically, the 74LVC4245A uses a wide-bandwidth pass-gate architecture that avoids the direction-switching dead time typical of discrete MOSFET translation circuits. The DIR pin sets the data flow from A to B (HIGH) or B to A (LOW), and the OE pin enables or three-states the outputs. Because the device is non-inverting, the A-side logic level is mirrored directly on the B-side and vice versa, simplifying firmware design.
Typical applications include 3.3 V to 5 V bidirectional bus translation in mixed-voltage microcontroller systems, expansion bus isolation between processor and peripheral cards, and legacy interface bridging in industrial control, point-of-sale, and embedded computing platforms.
A key design consideration when using this part is that the DIR pin must be driven by the controller that owns the bus, and the OE pin must be toggled to prevent bus contention during direction changes. Decoupling both VCC rails with 100 nF ceramic capacitors placed as close as possible to the IC pins is critical for clean translation at high edge rates.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not aggregated in the manufacturer datasheet.
드롭인 대체품: 74LVC4245ABQ+118 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
74LVC4245ABQ,118
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
74LVC4245ABQ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
74LVC4245ABQ-Q100
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
74LVC4245A
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
74LVC4245ABQ+
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
74LVC4245ABQ+118 최대 정격 & 전기적 특성
| 기능 | Octal dual-supply translating transceiver, non-inverting |
| Number of Channels | 8 |
| Direction Control | 1 DIR pin (bidirectional A↔B) |
| Output Enable | Yes, active-HIGH OE (3-state outputs) |
| Logic Family | 74LVC (Low-Voltage CMOS) |
| VCC (5 V side, VCC(B)) | 4.5 V to 5.5 V |
| VCC (3 V side, VCC(A)) | 2.7 V to 3.6 V |
| Input Voltage Tolerance (5 V side) | Up to 5.5 V |
| 동작 온도 | -40 °C to +125 °C |
| 패키지 | DHVQFN-24 (SOT815, 5.5x3.5 mm) with exposed pad |
| 실장 유형 | Surface Mount |
| RoHS 상태 | Compliant |
| Lead-Free | Yes |
| Reel / Packaging Code | 118 = Tape and Reel, 2500 pcs |
| 출력 유형 | 3-state, non-inverting, bus compatible |
74LVC4245ABQ+118 핀 구성
| 핀 1 | DIR — Direction control (HIGH = A→B, LOW = B→A) |
| 핀 2 | A0 — A-side data I/O, channel 0 |
| 핀 3 | A1 — A-side data I/O, channel 1 |
| 핀 4 | A2 — A-side data I/O, channel 2 |
| 핀 5 | A3 — A-side data I/O, channel 3 |
| 핀 6 | A4 — A-side data I/O, channel 4 |
| 핀 7 | A5 — A-side data I/O, channel 5 |
| 핀 8 | A6 — A-side data I/O, channel 6 |
| 핀 9 | A7 — A-side data I/O, channel 7 |
| 핀 10 | GND — Ground reference |
| 핀 11 | VCC(A) — A-side supply (3.3 V rail, 2.7 V to 3.6 V) |
| 핀 12 | B7 — B-side data I/O, channel 7 |
| 핀 13 | B6 — B-side data I/O, channel 6 |
| 핀 14 | B5 — B-side data I/O, channel 5 |
| 핀 15 | B4 — B-side data I/O, channel 4 |
| 핀 16 | B3 — B-side data I/O, channel 3 |
| 핀 17 | B2 — B-side data I/O, channel 2 |
| 핀 18 | B1 — B-side data I/O, channel 1 |
| 핀 19 | B0 — B-side data I/O, channel 0 |
| 핀 20 | VCC(B) — B-side supply (5 V rail, 4.5 V to 5.5 V) |
| 핀 21 | OE — Output enable, active HIGH (HIGH = outputs disabled, Hi-Z) |
| 핀 22 | NC — Not connected (per datasheet) |
| 핀 23 | NC — Not connected (per datasheet) |
| 핀 24 | NC — Not connected (per datasheet) |
일반적인 애플리케이션
74LVC4245ABQ+118 적합 용도: 7 애플리케이션s: 3.3 V to 5 V Microcontroller Bus Translation, Legacy 5 V Peripheral Expansion, FPGA / ASIC Mixed-Voltage I/O Bridging, Memory and EEPROM Interface Bridging, Point-of-Sale and Card Reader Interfaces, Isolated UART and GPIO Bridging, Test and Measurement Equipment Backplanes.
3.3 V to 5 V Microcontroller Bus Translation
The 74LVC4245ABQ+118 is purpose-built for bidirectional translation between a 3.3 V microcontroller bus (VCC(A)) and a 5 V peripheral bus (VCC(B)). Its eight channels match an 8-bit data bus, and the DIR pin lets the firmware control direction flow without external logic. The OE pin three-states the outputs when the bus is idle, preventing contention. Compared to discrete MOSFET translators, the integrated DIR/OE control reduces BOM count and eliminates the direction-change dead time that plagues discrete designs.
추천
Legacy 5 V Peripheral Expansion
Industrial control boards often need to drive 5 V logic peripherals (legacy LCDs, keypads, parallel ADCs) from a modern 3.3 V host processor. The 74LVC4245ABQ+118 provides 8 bidirectional channels and ±24 mA drive on the B-side to sink/source 5 V TTL loads. Its non-inverting topology means A-side logic states mirror directly on the B-side, simplifying firmware. The exposed-pad DHVQFN package keeps the BOM compact for space-constrained PLC and HMI modules.
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FPGA / ASIC Mixed-Voltage I/O Bridging
Modern FPGAs and ASICs typically run with 3.3 V or lower I/O banks, but legacy logic, memory, or interface chips may require 5 V signals. The 74LVC4245ABQ+118 bridges these two domains in a single 24-pin package with predictable propagation delay and 3-state control. The DIR pin can be tied to an FPGA GPIO so the FPGA firmware owns direction flow. The exposed pad provides a low-impedance ground return for high-speed edges on the B-side bus.
추천
Memory and EEPROM Interface Bridging
Many parallel EEPROMs and SRAMs still operate at 5 V, while modern MCUs run at 3.3 V. The 74LVC4245ABQ+118 can act as the bidirectional level shifter between the MCU and the 5 V memory, handling address, data, and control signals. Eight channels cover the lower 8 address/data bits of a parallel memory interface, and additional chips can be added for wider buses. The OE pin enables bus isolation during memory write cycles.
추천
Point-of-Sale and Card Reader Interfaces
POS terminals frequently combine a 3.3 V application processor with 5 V magnetic-stripe readers, keypads, and thermal printers. The 74LVC4245ABQ+118 provides reliable, industrial-temperature (-40 °C to +125 °C) translation for these legacy interfaces. Its 3-state outputs allow safe bus sharing with multiple peripherals, and the wide operating voltage range tolerates noisy POS power rails. The compact DHVQFN-24 package saves board area in slim terminal designs.
추천
Isolated UART and GPIO Bridging
When a 3.3 V UART/GPIO must talk to a 5 V peripheral (or vice versa), the 74LVC4245ABQ+118 provides a robust, bidirectional bridge. Although typically used for parallel buses, the device works equally well for individual UART TX/RX lines or GPIO pins when multiple channels are wired in parallel. The OE pin allows a controller to three-state the bus during low-power modes. This makes the part useful in industrial sensor hubs and gateway designs.
추천
Test and Measurement Equipment Backplanes
Test gear often pairs a 3.3 V FPGA-based controller with 5 V measurement front-ends, DACs, and trigger logic. The 74LVC4245ABQ+118 provides the bidirectional translation needed for trigger and status signals. Its predictable timing and 3-state bus capability make it well suited to backplane designs where bus contention must be avoided. The exposed pad DHVQFN package dissipates heat cleanly when the B-side drives heavily-loaded 5 V backplane signals.
추천
추천 제품 요약
엔지니어링 참조 데이터: 74LVC4245ABQ+118 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | 74LVC4245ABQ,118 | 74LVC4245ABQ | 74LVC4245ABQ-Q100 | 74LVC4245A | 74LVC4245ABQ+ |
|---|---|---|---|---|---|---|
| Package | DHVQFN-24 (SOT815, 5.5x3.5 mm) | DHVQFN-24 (SOT815) - same | DHVQFN-24 (SOT815) - same | DHVQFN-24 (SOT815) - same | DHVQFN-24 (SOT815) - same | DHVQFN-24 (SOT815) - same |
| Brand | Nexperia | Nexperia - same | Nexperia - same | Nexperia - same | Nexperia - same | Nexperia - same |
| Function | Octal dual-supply translating transceiver | Identical function | Identical function | Identical function (automotive grade) | Identical function | Identical function |
| Channels | 8 | 8 | 8 | 8 | 8 | 8 |
| VCC(A) Range | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V |
| VCC(B) Range | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C (AEC-Q100) | -40 °C to +125 °C | -40 °C to +125 °C |
| Output Enable | Yes (active HIGH, 3-state) | Yes (active HIGH, 3-state) | Yes (active HIGH, 3-state) | Yes (active HIGH, 3-state) | Yes (active HIGH, 3-state) | Yes (active HIGH, 3-state) |
| Packaging Code | Reel code +118 (2500 pcs) | Reel code ,118 (2500 pcs) | Bulk / no reel code | AEC-Q100 reel code varies | Base part number | Reel code + variant |
| AEC-Q100 Automotive | No | No | No | Yes (AEC-Q100 qualified) | No | No |
주요 차별점
- Dual-suprail bidirectional translation in a single IC (vs Discrete N-channel MOSFET translator)
- Compact exposed-pad DHVQFN package with 5.5x3.5 mm footprint (vs SO-24 variant (74LVC4245AD,118))
- Industrial -40 °C to +125 °C temperature range (vs Commercial-grade (0 °C to +70 °C) logic transceivers)
설계 노트
Both VCC(A) and VCC(B) rails must be decoupled with a 100 nF ceramic capacitor placed within 2 mm of each supply pin. Adding a 10 µF bulk capacitor near each rail improves transient response when driving heavy capacitive loads on the 5 V B-side bus. Power-up sequencing between VCC(A) and VCC(B) is not required, but both rails must be present before DIR/OE transitions to avoid bus contention.
The exposed thermal pad (EP) of the DHVQFN-24 package must be soldered to a PCB ground plane with multiple thermal vias for heat dissipation and ground return. Keep A-side and B-side trace groups physically separated on the PCB to avoid coupling between the 3.3 V and 5 V bus segments. Place series termination resistors near the device on the B-side if the bus is longer than 50 mm to control edge rates.
Do not leave the DIR pin floating - it must be driven actively by a controller output to set the direction reliably. The OE pin must be driven LOW for normal operation; leaving it HIGH three-states the bus and may appear as a fault to downstream logic. Avoid tying DIR statically HIGH or LOW in designs where both directions are needed - use a GPIO instead. Do not exceed 5.5 V on the B-side inputs even if VCC(B) is not yet present.
규정 준수 정보
RoHS compliant per Nexperia product page. Standard (non-automotive) grade - choose 74LVC4245ABQ-Q100 for AEC-Q100 qualification. Lead-free and halogen-free per Nexperia environmental data.
