Part A
LTC4359HMS8
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2548 Stückzahl
- Package
- MSOP-8
- Series
- PMIC dopOR Controller, ideale Dioden
Replacement verdict
Not a drop-in replacement
The LTC4359HMS8 and LTC4313IMS8-2#PBF are functionally unrelated devices and cannot serve as substitutes for one another. The LTC4359HMS8 is an ideal diode controller with reverse input protection, while the LTC4313IMS8-2#PBF is a hot-swappable 2-wire bus buffer with stuck-bus recovery. Their core functions, pin configurations, and application roles are fundamentally different, making cross-replacement technically invalid.
Different device function
Different pin configuration
Different application role
Different internal topology
Parts at a glance
Part B
LTC4313IMS8-2#PBF
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5459 Stückzahl
- Package
- TSSOP-8
- Series
- Schnittstelle mit Signalpuffer, Repeater, Splitter
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | LTC4359HMS8 | LTC4313IMS8-2#PBF | Why it matters |
|---|---|---|---|
| Function | Ideal Diode Controller with Reverse Input Protection | I2C/SMBus Bus Buffer with Stuck Bus Recovery | These devices perform fundamentally different functions, so they are not functionally substitutable in most designs. |
| Supply Voltage Range | 4 V to 80 V | 2.9 V to 5.5 V | Operating voltage range determines compatibility with the system power rail; the LTC4359 supports much higher voltages. |
| Package | 8-Lead MSOP | 8-Lead MSOP | Both share the same footprint, but pin functions differ, so they are not drop-in replacements. |
| Operating Temperature Range | -40°C to 125°C (H-grade) | -40°C to 85°C (I-grade) | The wider temperature range of the LTC4359 suits harsher environments such as automotive or industrial applications. |
| Typical Supply Current | 135 µA | 3.5 mA | Quiescent current affects power efficiency, especially in always-on or battery-powered systems. |
| Number of Channels | 1 | 2 (bidirectional buffer) | Channel count and directionality determine how many signal paths can be managed by the device. |
| Primary Application | Power ORing, reverse-battery protection, inrush limiting | I2C bus extension, capacitance buffering, stuck-bus recovery | Target applications define the circuit context in which each part is used and whether substitution is feasible. |
| Interface Type | Analog / power control (gate drive) | Digital I2C / SMBus | The signal domain differs completely, preventing interchangeability between the two parts. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | LTC4359HMS8 | LTC4313IMS8-2#PBF |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Active |
| Type | N+1 ORing Controller | Buffer, Accelerator |
| Applications | Automotive, Redundant Power Supplies, Telecom Infrastructure | I²C - Hotswap |
| Input | - | 2-Wire Bus |
| Output | - | 2-Wire Bus |
| Data Rate (Max) | - | 400kHz |
| Number of Channels | - | 1 |
| Capacitance - Input | - | 10 pF |
| Voltage - Supply | 4V ~ 80V | 2.9V ~ 5.5V |
| Supply Current | 150 µA | 8.1mA |
| Operating Temperature | -40°C ~ 125°C (TA) | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| FET Type | N-Channel | - |
| Ratio - Input: Output | N:1 | - |
| Internal Switch(s) | No | - |
| Delay Time - ON | 200 µs | - |
| Delay Time - OFF | 300 ns | - |
| Current - Output (Max) | 220µA | - |
Frequently asked questions
Are the LTC4359HMS8 and LTC4313IMS8-2#PBF interchangeable in a circuit design?
No. The LTC4359HMS8 is an ideal diode controller with reverse input protection, while the LTC4313IMS8-2#PBF is a hot-swappable 2-wire bus buffer with stuck-bus and arbitration support. They perform entirely different functions and are not pin-to-pin or functionally interchangeable.
What are the primary functions of the LTC4359HMS8 and LTC4313IMS8-2#PBF?
The LTC4359HMS8 is an ideal diode controller that replaces a discrete Schottky diode in power paths, providing low forward voltage drop and reverse input protection. The LTC4313IMS8-2#PBF is a 2-wire bus buffer that provides bidirectional buffering, stuck-bus disconnection, and arbitration for I²C/SMBus systems.
Do both devices come in the same package type?
Yes. Both the LTC4359HMS8 and the LTC4313IMS8-2#PBF are offered in an 8-lead MSOP package. However, their pin functions and internal circuitry differ, so they are not pin-compatible substitutes.
What are the key supply voltage ranges for the LTC4359HMS8 and LTC4313IMS8-2#PBF?
The LTC4359HMS8 operates from a wide supply range of 4 V to 80 V, making it suitable for high-voltage power path applications. The LTC4313IMS8-2#PBF operates from a 2.9 V to 5.5 V supply, which is typical for low-voltage I²C/SMBus buffer applications.
Which device is better suited for hot-swap applications?
The LTC4313IMS8-2#PBF is specifically designed for hot-swappable I²C/SMBus applications, featuring stuck-bus disconnection and arbitration. The LTC4359HMS8 is an ideal diode controller for power path management and reverse input protection, not for hot-swapping bus lines.
Can the LTC4359HMS8 be used in I²C bus buffering applications?
No. The LTC4359HMS8 is an ideal diode controller intended for power path and reverse protection applications. It does not provide the bidirectional buffering, stuck-bus detection, or arbitration required for I²C/SMBus systems.
What are the operating temperature ranges for these two devices?
The LTC4359HMS8 is specified over the –40 °C to 125 °C operating junction temperature range. The LTC4313IMS8-2#PBF is specified over the –40 °C to 85 °C operating temperature range. These ranges should be verified against the latest manufacturer datasheets for the specific grade.
Are there any shared applications where both devices could appear in the same system?
Yes. In a system with a hot-swappable I²C bus and a redundant power path, the LTC4313IMS8-2#PBF could buffer the bus while the LTC4359HMS8 manages the power path. However, they serve distinct roles and are not direct substitutes for one another.