Part A
MAX6369KA+T
Analog Devices Inc./Maxim Integrated
- Lifecycle
- Active
- Stock
- 7382 PCS
- Package
- SOT-23-8
- Series
- PMIC - Supervisores
Replacement verdict
Not a drop-in replacement
The MAX6369KA+T and MAX6313UK38D4-T are not functionally interchangeable. The MAX6369KA+T is a watchdog timer with an adjustable timeout and manual reset input, while the MAX6313UK38D4-T is a fixed-threshold microprocessor supervisory circuit with a 3.8V reset threshold and 1.12s reset timeout. Their core functions, output configurations, and pinouts differ fundamentally, so direct substitution is not possible without circuit redesign.
Different function
Different output type
Different pinout
Different threshold
Parts at a glance
Part B
MAX6313UK38D4-T
Analog Devices Inc./Maxim Integrated
- Lifecycle
- Active
- Stock
- 9480 PCS
- Package
- SOT-753
- Series
- PMIC - Supervisores
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | MAX6369KA+T | MAX6313UK38D4-T | Why it matters |
|---|---|---|---|
| Function | Watchdog timer | Microprocessor supervisory circuit | These devices serve fundamentally different roles, so they are not direct functional substitutes. |
| Reset Output Type | None (watchdog only) | Push-pull active-low reset | A reset output is required to hold a processor in reset during power-up or fault conditions. |
| Watchdog Function | Yes | No | Watchdog capability determines whether the device can detect and recover from software lockups. |
| Reset Threshold Voltage | Not applicable | 3.8 V (typ) | The reset threshold must match the monitored supply rail to ensure proper system reset behavior. |
| Reset Timeout Period | Not applicable | 1.4 s (typ) | The reset timeout must be long enough for the processor supply and clock to stabilize before releasing reset. |
| Watchdog Timeout Period | Adjustable via external capacitor | Not applicable | The watchdog timeout must be set longer than the longest expected software loop to avoid false resets. |
| Supply Voltage Range | 2.5 V to 5.5 V | 1.2 V to 5.5 V | The operating supply range must cover the system rail voltage for reliable operation. |
| Package | SOT-23-8 | SOT-23-5 | Package footprint and pin count affect PCB layout and cannot be interchanged without redesign. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +85 °C | The temperature range must cover the application's ambient conditions for guaranteed performance. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | MAX6369KA+T | MAX6313UK38D4-T |
|---|---|---|
| Part Status | Obsolete | Obsolete |
| Type | Watchdog Circuit | Multi-Voltage Supervisor |
| Number of Voltages Monitored | 1 | 2 |
| Voltage - Threshold | Adjustable/Selectable | 3.8V, Adj |
| Output | Open Drain or Open Collector | Push-Pull, Totem Pole |
| Reset | Active Low | Active High |
| Reset Timeout | Adjustable/Selectable | 1.12s Minimum |
| Operating Temperature | -40°C ~ 125°C (TA) | 0°C ~ 70°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary functions of the MAX6369KA+T and MAX6313UK38D4-T?
The MAX6369KA+T is a microprocessor supervisory circuit that provides power-on reset, manual reset input, and watchdog timer functions. The MAX6313UK38D4-T is a microprocessor supervisory circuit that combines a reset output with a watchdog timer and a factory-trimmed reset threshold voltage of 3.8V.
What is the reset threshold voltage for each device?
The MAX6369KA+T has an adjustable reset threshold set by external resistors, allowing a wide range of monitored voltages. The MAX6313UK38D4-T has a fixed, factory-trimmed reset threshold of 3.8V, as indicated by the "38" in its part number.
How do the watchdog timer features compare between the MAX6369KA+T and MAX6313UK38D4-T?
Both devices include a watchdog timer. The MAX6369KA+T offers a selectable watchdog timeout period via external capacitor or pin configuration. The MAX6313UK38D4-T has a fixed watchdog timeout period, with the "D4" suffix indicating a specific timeout value (typically 1.6s or 3.2s depending on the option).
What are the package types for these two components?
The MAX6369KA+T is available in a 5-pin SOT-23 package. The MAX6313UK38D4-T is available in a 5-pin SOT-23 package as well, but the "UK" suffix in the part number indicates a different pinout or option set compared to the MAX6369.
Can the MAX6369KA+T and MAX6313UK38D4-T be used interchangeably in a design?
No, they are not pin-for-pin or function-for-function interchangeable. The MAX6369KA+T has an adjustable reset threshold and a different pin configuration, while the MAX6313UK38D4-T has a fixed 3.8V threshold and a specific watchdog timeout. A direct substitution would require verifying pin functions, threshold voltage, and watchdog timing against the target design requirements.
What is the operating voltage range for each device?
The MAX6369KA+T operates from a supply voltage range of 1.2V to 5.5V. The MAX6313UK38D4-T operates from a supply voltage range of 1.2V to 5.5V, with its reset threshold fixed at 3.8V, making it suitable for monitoring 3.3V or 5V systems with appropriate margin.
Do both devices provide a manual reset input?
The MAX6369KA+T includes a manual reset input that allows a system to be reset via an external pushbutton or logic signal. The MAX6313UK38D4-T does not include a manual reset input; its reset is triggered only by the monitored supply voltage dropping below the fixed threshold or by a watchdog timeout.
What is the reset output type for each device?
The MAX6369KA+T provides an active-low push-pull reset output. The MAX6313UK38D4-T provides an active-low open-drain reset output, which requires an external pull-up resistor to a suitable logic supply voltage.