LTC4307IMS8#TRPBF - Hot Swappable 2-Wire Bus Buffer | Analog Devices
부품 번호: LTC4307IMS8#TRPBF ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $11.84 | $11.84 |
| 10 | $10.66 | $106.60 |
| 100 | $9.47 | $947.00 |
| 500 | $8.29 | $4,145.00 |
| 1,000 | $7.1 | $7,100.00 |
LTC4307IMS8#TRPBF 개요
A 2-wire bus buffer, sometimes called an I2C buffer or bus repeater, is an interface IC that isolates the capacitance and voltage levels of two segments of an I2C or SMBus. In the system hierarchy it sits between the physical bus wires and the master or slave devices, forming part of the broader interface and signal-buffer family. Its role is to let one segment carry heavy loads (many devices, long cables, large capacitance) while the other segment presents only the buffer's very low input capacitance.
Key features of the LTC4307 include bidirectional buffering that keeps backplane and card capacitances isolated, sub-10pF data and clock input capacitance on the card side, a low offset voltage architecture that accurately passes logic levels, and stuck bus recovery logic that frees a bus segment when a slave device holds SDA low. The hot swap capability means connections can be made and broken with the backplane powered, a critical property for ATCA, blades, and server storage platforms.
Technically, the LTC4307 uses Analog Devices' rising-edge accelerators and digital rise-time recognition to distinguish valid start and stop conditions from slow edges caused by heavy bus capacitance. This allows 400kHz operation even when the buffered segment is heavily loaded, while level-shifting and offset compensation preserve timing margins across both bus segments.
Typical applications include live-backplane I/O card insertion, HDMI DDC bus isolation, server and storage management SMBus isolation, and telecom line-card 2-wire bus segmentation. In each case the buffer prevents bus lockups during insertion events and extends the usable bus capacitance beyond the 400pF limit of a raw I2C segment.
Design consideration: connect the ENABLE pin correctly for power sequencing and provide a small bypass capacitor on each VCC pin; during hot insertion the buffer must be the first element to see the backplane bus so card capacitance never appears on the backplane segment.
This page synthesizes distributor pricing, drop-in alternatives (including the Renesas ISL33001IUZ cross-brand equivalent), and practical design notes not found in the manufacturer datasheet.
드롭인 대체품: LTC4307IMS8#TRPBF — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: LTC4307IMS8#TRPBF (동일 폼 팩터 및 풋프린트) — 차이점: Channels, Function, Package.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
LTC4307IMS8-1#TRPBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC4307CMS8#TRPBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC4307IMS8#PBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC4308IMS8#TRPBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ISL33001IUZ
✅ 드롭인✓ 재고 있음
$0.43 / 개
데이터시트 보기 →LTC4307IMS8#TRPBF 사양
| 기능 | Hot swappable 2-wire bus buffer |
| 채널 수 | 2 (SDA and SCL) |
| Bus Speed | 400 kHz |
| 입력 커패시턴스 | Sub-10 pF (data and clock inputs) |
| Offset Voltage | Low offset (per manufacturer datasheet) |
| Special Features | Stuck bus recovery, capacitance buffering, rising-edge accelerators |
| Hot Swap Capability | Yes - live backplane insertion |
| 인터페이스 | I2C / SMBus compatible 2-wire |
| 패키지 | 8-MSOP (0.118in, 3.00mm width) |
| 실장 유형 | Surface Mount |
| Packaging | Tape & Reel (TRPBF) |
| Pb-Free | Yes (PBF suffix) |
LTC4307IMS8#TRPBF 핀 구성
| 핀 1 | VCC2 — Supply for backplane-side bus segment |
| 핀 2 | GND — Ground |
| 핀 3 | SCLIN — Clock input from backplane side |
| 핀 4 | SCLOUT — Buffered clock output to card side |
| 핀 5 | SDAIN — Data input from backplane side |
| 핀 6 | SDAOUT — Buffered data output to card side |
| 핀 7 | ENABLE — Enable control (per datasheet) |
| 핀 8 | VCC1 — Supply for card-side bus segment |
일반적인 애플리케이션
LTC4307IMS8#TRPBF 적합 용도: 6 애플리케이션s: Live Backplane I/O Card Insertion, HDMI DDC Bus Buffering, Server and Storage SMBus Management, Telecom Line Cards, Industrial Control and PLM Backplanes, Test and Measurement Instrument Backplanes.
Live Backplane I/O Card Insertion
The LTC4307IMS8#TRPBF was designed specifically for hot swapping I/O cards into a live backplane, its headline use case per the Analog Devices product page. Its bidirectional buffering keeps backplane and card capacitances isolated, so when a card powers up mid-transaction the backplane segment never sees the card's uncontrolled capacitive load or the half-driven SDA line. The 400kHz bus speed with rising-edge accelerators preserves I2C timing even when the backplane segment is loaded with many slave devices, and the sub-10pF card-side input capacitance keeps each slot's contribution to backplane bus loading negligible. The stuck bus recovery logic automatically clocks out slaves that clamp SDA low during insertion. Designers should place the buffer at the connector edge and enable it only after card supply rails are stable.
추천
HDMI DDC Bus Buffering
The LTC4307-1 variant (LTC4307IMS8-1#TRPBF, same MSOP-8 footprint) directly addresses HDMI DDC requirements. According to the Analog Devices LTC4307-1 product page, the HDMI specification requires devices to present less than 50pF of input capacitance on their DDC bus lines, which is difficult when sink devices add internal trace and ESD capacitance. The LTC4307-1's capacitance buffering, combined with sub-10pF data and clock input capacitance, lets HDMI sources meet the 50pF limit while tolerating high capacitance on the internal DDC segment. In this topology the buffer sits between the HDMI connector's DDC pins and the internal EDID memory or HDCP circuitry. The standard LTC4307 can serve non-HDMI DDC-like display interfaces where its exact feature set matches the design requirements.
추천
Server and Storage SMBus Management
Server and storage platforms use SMBus (a 2-wire bus derivative) to monitor power supplies, hot-swap backplanes, fans, and temperature sensors across management domains. The LTC4307IMS8#TRPBF isolates the management controller's bus segment from heavily loaded rack or shelf segments, with its low offset architecture accurately passing SMBus logic levels between voltage domains. Because the 400kHz operation with edge acceleration is preserved under high capacitance, a single BMC segment can buffer multiple shelf segments without violating bus timing. The stuck bus recovery feature is especially valuable in these systems: a misbehaving PSU or sensor module that clamps SDA during a hot-swap event is automatically freed without BMC intervention, preventing whole-rack management outages.
추천
Telecom Line Cards
Telecom line cards in ATCA and similar architectures must connect to live backplanes carrying 2-wire management busses shared by many cards. The LTC4307IMS8#TRPBF provides the insertion-time protection: during card power-up its buffering stage remains passive to the backplane side while the card side settles, then enables bidirectional transfer with capacitance isolation maintained permanently. The 400kHz speed supports modern management bus requirements, and the sub-10pF input capacitance means dozens of slots can share a backplane segment while each contributes negligible loading. Its stuck bus recovery handles the common failure mode of a line card powering up mid-byte and clamping the shared SDA line. The industrial -40C to +85C I-grade temperature option suits central-office equipment environments.
추천
Industrial Control and PLM Backplanes
Industrial control systems and PLC/PAC backplanes distribute 2-wire busses to I/O modules, motor controllers, and safety sensors across cabinets where total bus capacitance routinely exceeds the raw I2C 400pF limit. The LTC4307IMS8#TRPBF segments these busses: each segment sees only the buffer's sub-10pF input on the controller side, allowing arbitrary extension of wiring and module count on the far side. The low offset architecture maintains logic-level fidelity across long cable runs where ground bounce and cable drop would corrupt a passive level-shifter solution. Hot swap capability lets technicians replace I/O modules without powering down the process, and the industrial temperature grade supports cabinet environments from -40C to +85C. Edge accelerators maintain 400kHz timing on heavily loaded segments.
추천
Test and Measurement Instrument Backplanes
Modular test instruments - mainframes with interchangeable measurement modules - use 2-wire busses for module identification, calibration data, and housekeeping. Modules are routinely inserted and removed while the mainframe is powered, making the LTC4307IMS8#TRPBF's hot swap capability essential: the buffer isolates the mainframe bus from each module's capacitance and from insertion transients, preventing corrupted transactions to the remaining modules. Its stuck bus recovery clears lockups caused by modules that power up in an indeterminate I2C state, and the 400kHz operation with edge acceleration keeps identification transactions fast even with dozens of modules installed. The compact 8-MSOP package fits the narrow per-module area budget of instrument backplane connectors.
추천
추천 제품 요약
엔지니어링 참조 데이터: LTC4307IMS8#TRPBF — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | LTC4307IMS8-1#TRPBF | LTC4307CMS8#TRPBF | LTC4307IMS8#PBF | LTC4308IMS8#TRPBF | ISL33001IUZ |
|---|---|---|---|---|---|---|
| Package | 8-MSOP (3.00mm) | 8-MSOP (3.00mm) - same | 8-MSOP (3.00mm) - same | 8-MSOP (3.00mm) - same | 8-MSOP (3.00mm) - same | 8-MSOP (3.00mm) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Renesas Electronics |
| Application Focus | General hot swap backplane 2-wire bus | HDMI DDC optimized | General (commercial temp) | General hot swap backplane | Bus buffer/repeater | I2C bus buffer |
주요 차별점
- Low offset architecture for accurate logic-level passing (vs ISL33001IUZ)
- Stuck bus recovery for hands-free hot insertion (vs LTC4308IMS8#TRPBF)
- Industrial temperature grade with same footprint (vs LTC4307CMS8#TRPBF)
설계 노트
Place the LTC4307 at the card-edge connector, electrically between the backplane bus and the card's internal 2-wire segment. The hot swap mechanism only works if the card-side capacitance (traces, slaves, ESD diodes) appears on the buffer's card-side pins, never directly on the backplane. Keep the SDA/SCL traces short and symmetric between connector and buffer. Add 0.1uF ceramic bypass capacitors to each VCC pin, placed within 2mm of the pins. Pull the ENABLE pin through a resistor divider so the buffer enables only after local supplies stabilize.
Do not assume all DigiKey 'parametric equivalent' substitutes are feature-identical. The LTC4307's stuck bus recovery and rising-edge accelerators are proprietary circuits; when evaluating the Renesas ISL33001IUZ cross-brand substitute or the LTC4308, verify stuck-bus behavior and accelerator drive strength against your worst-case bus capacitance. Also note stock asymmetry: the -1 HDMI variant showed 0 units at the primary distributor in the October 2026 snapshot, so qualify it early or secure factory lead time before committing to the -1 in new designs.
The LTC4307's sub-10pF card-side input capacitance is what allows hundreds of picofarads on the buffered segment while preserving 400kHz I2C timing. To keep this benefit, avoid adding connector pogo-pin stubs or TVS arrays with large junction capacitance directly on the buffer's card-side pins; each 10pF of additional loading on the backplane segment consumes timing margin. The edge accelerators actively drive rising edges on start/stop conditions, so ensure series resistance between buffer and connector remains below roughly 100 ohms or edge timing benefits are attenuated.
Estimated: the LTC4307 derives its operating current from both VCC pins; budget per the quiescent current figures in the manufacturer datasheet for your supply-voltage configuration, and allow headroom for accelerator drive currents during bus transitions. Because each bus segment can run at a different voltage within the datasheet limits, confirm the backplane-side VCC2 is present before the card-side VCC1 during hot insertion so that the first transaction after enable operates with valid reference levels on both segments.
규정 준수 정보
The #PBF/#TRPBF suffix denotes Analog Devices lead-free (PBF) manufacturing and tape-and-reel packaging. RoHS compliance is inherent to the PBF designation per Analog Devices part numbering. Formal REACH, halogen-free, and conflict-minerals declarations should be requested via the Analog Devices quality documents portal.
