Part A
ADM709LARZ
아날로그 디바이스(주)
- Lifecycle
- Active
- Stock
- 6460 PCS
- Series
- 전원 관리(PMIC) - 감독자
Replacement verdict
Compatible functional replacement candidate
The ADM709LARZ and ADM705AR-REEL are both microprocessor supervisory circuits from Analog Devices in an 8-lead SOIC package, sharing the same core function of supply monitoring with active-low reset output. However, they differ in reset threshold voltage and reset timeout period, so the ADM709LARZ can serve as a functional substitute for the ADM705AR-REEL only after confirming that the differing threshold and timeout values are acceptable for the target application.
Package Type
High match
Reset Output Type
High match
Reset Threshold Voltage
Validation required
Reset Timeout Period
Validation required
Parts at a glance
Part B
ADM705AR-REEL
아날로그 디바이스(주)
- Lifecycle
- Active
- Stock
- 7831 PCS
- Package
- SOIC-8
- Series
- PMIC - 감독자
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADM709LARZ | ADM705AR-REEL | Why it matters |
|---|---|---|---|
| Reset Threshold Voltage (typ) | 4.65 V | 4.65 V | The threshold determines the supply voltage at which a reset is asserted; matching thresholds ensures equivalent brownout detection behavior. |
| Reset Output Type | Active Low (push-pull) | Active Low (push-pull) | The output stage must match the logic interface of the downstream processor to guarantee correct reset signaling. |
| Number of Monitored Supplies | 1 | 1 | Both monitor a single supply rail, so they serve the same supervisory role in a system. |
| Manual Reset Input | Yes | Yes | A manual reset pin allows external system reset control; both devices provide this feature for equivalent functionality. |
| Watchdog Timer | No | Yes | A watchdog monitors processor activity and asserts reset on a hang; the ADM705 includes one while the ADM709 does not, affecting substitutability. |
| Reset Timeout Delay (typ) | 200 ms | 200 ms | The reset pulse width must be long enough for the processor to initialize; matching delays preserve timing compatibility. |
| Supply Voltage Range | 4.75 V to 5.5 V | 4.75 V to 5.5 V | Operating voltage range must cover the system rail to ensure reliable supervision across the full supply tolerance. |
| Package | 8-SOIC | 8-SOIC | Identical package and pinout allow drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching temperature ratings ensure both parts meet the same environmental requirements of the application. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADM709LARZ | ADM705AR-REEL |
|---|---|---|
| Part Status | Active | Obsolete |
| Type | Simple Reset/Power-On Reset | Simple Reset/Power-On Reset |
| Number of Voltages Monitored | 1 | 1 |
| Voltage - Threshold | 4.65V | 4.65V |
| Output | Push-Pull, Totem Pole | Push-Pull, Totem Pole |
| Reset | Active Low | Active Low |
| Reset Timeout | 140ms Minimum | 160ms Minimum |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Base Product Number | ADM709 | - |
| Digi Key Programmable | Not Verified | - |
| Packaging | Tube | - |
Frequently asked questions
What are the key differences between the ADM709LARZ and ADM705AR-REEL?
The ADM709LARZ is a microprocessor supervisory circuit in an 8-lead SOIC package (L suffix denotes 4.63 V reset threshold, ARZ denotes SOIC), while the ADM705AR-REEL is a supervisory circuit in an 8-lead SOIC (AR) supplied on tape and reel. The ADM705 has a 4.65 V reset threshold and includes a watchdog timer input, whereas the ADM709L does not include a watchdog function. Both are from Analog Devices and monitor a single supply voltage.
Are the ADM709LARZ and ADM705AR-REEL pin-compatible?
Both devices are offered in an 8-lead SOIC package, but their pin functions differ. The ADM705 includes a watchdog input (WDI) pin, while the ADM709L does not. Therefore, they are not functionally pin-compatible and cannot be substituted without verifying the pinout against the respective datasheets.
What reset threshold voltages do these two parts have?
The ADM709LARZ has a reset threshold of 4.63 V (L version). The ADM705AR-REEL has a reset threshold of 4.65 V. Both are intended for 5 V supply monitoring, and the small threshold difference should be evaluated against the system's tolerance requirements.
Does either device include a watchdog timer?
The ADM705AR-REEL includes a watchdog timer function with a WDI input, used to monitor microprocessor activity. The ADM709LARZ does not include a watchdog timer. Designs requiring watchdog supervision should use the ADM705, while the ADM709L is suited to applications needing only reset and power-fail monitoring.
What is the difference in packaging and ordering format?
The ADM709LARZ is supplied in an 8-lead SOIC tube/standard packaging format (Z denotes lead-free/RoHS-compliant). The ADM705AR-REEL is supplied on tape and reel for automated assembly. Both use the same 8-lead SOIC body, but the ordering suffix affects handling and production line compatibility.
Can the ADM709LARZ be used as a drop-in replacement for the ADM705AR-REEL?
No. Although both are 8-lead SOIC supervisory circuits, the ADM705 includes a watchdog input that the ADM709L lacks, and their reset thresholds differ (4.65 V vs 4.63 V). A direct drop-in replacement is not supported; the circuit and firmware must be validated against the specific device datasheet before substitution.
What supply voltage range do these supervisory circuits support?
Both the ADM709LARZ and ADM705AR-REEL are designed for 5 V systems and operate from a supply that is monitored against their respective reset thresholds (4.63 V and 4.65 V). They are not specified for 3.3 V operation. Refer to the Analog Devices datasheets for the complete operating supply voltage and current specifications.