The Torex Semiconductor Ltd XC6122A337ER-G is a single-channel voltage supervisor designed to monitor system supply rails and generate reset signals when power conditions fall outside defined operating windows. Built around a 3.7V threshold, this watchdog circuit integrates fixed-voltage detection with an open-drain output topology, eliminating the need for external precision references or complex analog frontend conditioning in space-constrained embedded systems.
The device monitors one voltage rail continuously and asserts an active-low reset signal when the input drops below 3.7V, holding the connected microcontroller or processor in a safe reset state until stable power returns. The 100ms typical reset timeout provides adequate settling time for downstream logic to complete initialization sequences after power restoration, reducing the risk of brown-out-induced data corruption or unpredictable code execution. The open-drain output architecture allows for flexible logic-level interfacing and supports wired-OR configurations in multi-supervisor topologies without additional level-translation circuitry.
Housed in a 6-USPC package measuring 1.8mm × 2mm with an exposed pad, the XC6122A337ER-G delivers power monitoring functionality within a compact footprint suitable for densely populated PCB layouts in battery-powered devices, portable instrumentation, and IoT edge nodes. Surface-mount construction and compatibility with automated pick-and-place processes support high-volume manufacturing, while the -40°C to 85°C operating range covers industrial temperature environments and automotive cabin applications. MSL-1 rating allows unlimited floor life after package opening, simplifying inventory management and reducing moisture-related handling constraints in production.
This supervisor finds application in microcontroller reset sequencing, FPGA configuration monitoring, and power-supply fault detection where a single 3.7V rail requires continuous oversight. The open-collector output can drive CMOS and TTL logic inputs directly or pull external enable pins low during undervoltage events, providing straightforward integration into both analog and digital control paths. RoHS3 compliance and REACH-unaffected status align with environmental regulations for commercial and industrial distribution.
XC6122A337ER-G (1)
Finding a Practical Replacement for Torex Semiconductor Ltd XC6122A337ER-G
Replacing the Torex Semiconductor Ltd XC6122A337ER-G is usually not a simple one-to-one purchasing task. This device combines voltage supervision and watchdog functionality in a compact 6-USPC package, so replacement selection must consider threshold voltage, reset polarity, output structure, watchdog behavior, reset delay, PCB footprint, and system firmware assumptions.
Potential equivalent or alternative part numbers to evaluate include
XC6122A337MR-G
, MCP1316MT-37LE/OT,
XC6122A337MR-G
Torex Semiconductor Ltd
IC SUPERVISOR 1 CHANNEL SOT25
95409
TPS3823-33DBVR
,
TPS3823-33DBVR
Texas Instruments
IC SUPERVISOR 1 CHANNEL SOT23-5
200000
MAX823LEUK+T
,
MAX823LEUK+T
Analog Devices Inc./Maxim Integrated
IC SUPERVISOR 1 CHANNEL SOT23-5
17800
BD5237G-TR
, and NCP303LSN37T1G. Some are closer functional replacements, while others are suitable only when the watchdog function is unused, implemented elsewhere, or when PCB changes are acceptable.
BD5237G-TR
Rohm Semiconductor
IC SUPERVISOR 1 CHANNEL 5SSOP
200000
What the Torex Semiconductor Ltd XC6122A337ER-G Does in a Power-Supervision Circuit
The XC6122A337ER-G from Torex Semiconductor Ltd is a single-channel supervisor IC with watchdog functionality. It monitors one supply rail and asserts an active-low reset when the monitored voltage falls below a 3.7 V threshold. Its open-drain or open-collector reset output allows pull-up flexibility, which is useful when the reset line must interface with different logic voltages or multiple reset sources.
| Parameter | XC6122A337ER-G Characteristics | Replacement Impact |
|---|---|---|
| Manufacturer | Torex Semiconductor Ltd | Same-family parts are preferred when layout and behavior must remain close |
| Function | Voltage supervisor with watchdog circuit | Alternatives must be checked for both reset and watchdog behavior |
| Monitored voltages | 1 channel | Multi-channel supervisors are not required unless redesigning the reset architecture |
| Threshold voltage | 3.7 V | Best suited for monitoring a 5 V rail or a supply where reset must occur above the 3.3 V operating range |
| Reset output | Active-low, open drain/open collector | Push-pull alternatives may not be acceptable on shared reset lines |
| Reset timeout | 100 ms typical | Firmware startup timing and power sequencing must tolerate any delay difference |
| Package | 6-UFDFN exposed pad, 6-USPC 1.8 mm x 2.0 mm | Package and pinout are major constraints for drop-in replacement |
| Mounting | Surface mount | Replacement must match manufacturing capability and PCB footprint requirements |
| Temperature range | -40°C to +85°C | Suitable for commercial and industrial ambient environments |
| Compliance | RoHS3, REACH unaffected, MSL 1 | Helps simplify procurement qualification and storage handling |
In application, the XC6122A337ER-G is commonly used near microcontrollers, processors, communication modules, industrial controllers, embedded power rails, and battery-powered systems that require reset supervision plus watchdog recovery. Its 3.7 V threshold makes it different from many common 3.3 V reset supervisors, so alternatives with 2.9 V or 3.08 V thresholds may not provide the same brownout protection on a 5 V-derived system.
Candidate Replacement Parts for XC6122A337ER-G and When They Fit
The following replacement candidates should be reviewed from both circuit and sourcing perspectives.
XC6122A337MR-G
is the closest same-family option if the package and pinout can be accommodated. MCP1316MT-37LE/OT is a functional watchdog-supervisor alternative near the same threshold class.
XC6122A337MR-G
Torex Semiconductor Ltd
IC SUPERVISOR 1 CHANNEL SOT25
95409
TPS3823-33DBVR
and
TPS3823-33DBVR
Texas Instruments
IC SUPERVISOR 1 CHANNEL SOT23-5
200000
MAX823LEUK+T
are useful when watchdog supervision is required but the reset threshold or output behavior can be redesigned.
MAX823LEUK+T
Analog Devices Inc./Maxim Integrated
IC SUPERVISOR 1 CHANNEL SOT23-5
17800
BD5237G-TR
and NCP303LSN37T1G are voltage-detector alternatives when watchdog timing is not required inside the same IC.
BD5237G-TR
Rohm Semiconductor
IC SUPERVISOR 1 CHANNEL 5SSOP
200000
| Manufacturer | Part Number | Key Specifications | Product Features | Typical Applications | Why It Can Replace the Original Part | Main Differences or Limitations | Recommended Usage |
|---|---|---|---|---|---|---|---|
| Torex Semiconductor Ltd |
XC6122A337MR-G
Torex Semiconductor Ltd
IC SUPERVISOR 1 CHANNEL SOT25
95409
| 3.7 V threshold class, active-low reset, watchdog supervisor family | Same XC6122 base family, similar supervision concept | MCU reset circuits, 5 V rail monitoring, embedded control boards | Closest candidate when maintaining Torex XC6122 behavior is preferred | Package and pinout may differ from 6-USPC XC6122A337ER-G; layout verification required | Best first option when electrical behavior must remain close but PCB adjustment is possible |
| Microchip Technology | MCP1316MT-37LE/OT | 3.7 V supervisor class with watchdog function, active-low reset option | Combines reset supervision and watchdog monitoring | Microcontroller reset, industrial controls, consumer embedded systems | Similar functional role: supply monitoring plus watchdog reset | Output topology, timeout period, pinout, and package differ from XC6122A337ER-G | Suitable for redesigns needing similar threshold and watchdog functionality |
| Texas Instruments |
TPS3823-33DBVR
Texas Instruments
IC SUPERVISOR 1 CHANNEL SOT23-5
200000
| 3.3 V-class supervisor with watchdog, SOT-23 package | Watchdog input, reset output, compact package | 3.3 V MCU and DSP supervision | Can replace the watchdog-supervisor function where the monitored rail is 3.3 V | Threshold is not equivalent to 3.7 V; not a drop-in replacement | Use when the design actually needs 3.3 V rail supervision rather than 5 V rail brownout detection |
| Analog Devices / Maxim Integrated |
MAX823LEUK+T
Analog Devices Inc./Maxim Integrated
IC SUPERVISOR 1 CHANNEL SOT23-5
17800
| Microprocessor supervisor with watchdog and manual reset, 5-pin SOT-23 | Watchdog, reset timing, manual reset input depending on variant | Processor reset circuits, communication equipment, portable systems | Provides watchdog-supervisor functionality in a small package | Threshold and output type may not match XC6122A337ER-G; reset architecture may need changes | Good for redesigns where watchdog and manual reset features are useful |
| ROHM Semiconductor |
BD5237G-TR
Rohm Semiconductor
IC SUPERVISOR 1 CHANNEL 5SSOP
200000
| 3.7 V voltage detector, open-drain reset output options in BD52 family | Low-power voltage detection, compact package | Power rail monitoring, reset generation, battery equipment | Can replace the voltage-detection portion when watchdog is not needed | No integrated watchdog; pinout and package differ | Suitable when watchdog is handled by MCU firmware or another IC |
| onsemi | NCP303LSN37T1G | 3.7 V voltage detector, open-drain active-low reset variant | Supply voltage monitoring, low-current supervisor function | MCU reset, power-fail detection, embedded systems | Similar 3.7 V reset threshold and open-drain reset behavior | No watchdog function; different package and timing behavior | Use for cost- or availability-driven redesigns where watchdog is unnecessary |
Engineering Comparison of XC6122A337ER-G Replacement Options
A replacement for the XC6122A337ER-G should be selected according to the system’s reset strategy, not only by matching the nominal threshold. If the watchdog input is connected and relied upon for fault recovery, voltage-detector-only parts such as
BD5237G-TR
and NCP303LSN37T1G require an external watchdog or firmware-based mitigation. If the reset line is shared with other devices, open-drain behavior must be preserved or the reset network must be redesigned.
BD5237G-TR
Rohm Semiconductor
IC SUPERVISOR 1 CHANNEL 5SSOP
200000
| Evaluation Factor | XC6122A337MR-G | MCP1316MT-37LE/OT | TPS3823-33DBVR | MAX823LEUK+T | BD5237G-TR | NCP303LSN37T1G |
|---|---|---|---|---|---|---|
| Electrical compatibility | Closest same-family match if suffix options align | Good functional match for 3.7 V watchdog-supervisor use | Good watchdog match, weaker threshold match | Good watchdog-supervisor match, threshold must be checked | Good 3.7 V detector match only | Good 3.7 V detector match only |
| Mechanical compatibility | Requires package and pinout confirmation versus 6-USPC | Different footprint; PCB redesign likely | Different SOT-23 footprint | Different SOT-23 footprint | Different small-outline footprint | Different small-outline footprint |
| Reset threshold suitability | Best match to 3.7 V target | Close if 3.7 V ordering code is selected | Better for 3.3 V monitoring, not 3.7 V replacement | Often suited to 5 V supervisor thresholds, but not exact 3.7 V | Close 3.7 V threshold behavior | Close 3.7 V threshold behavior |
| Watchdog compatibility | Strongest candidate if watchdog timing matches | Strong functional candidate | Strong for watchdog-based MCU monitoring | Strong for watchdog and reset supervision | Not integrated | Not integrated |
| Output behavior | Expected to remain closest to original configuration | Must verify open-drain or push-pull option | Variant-dependent reset output | Variant-dependent reset output | Open-drain options available | Open-drain active-low variant available |
| Reset timing impact | Likely closest, but timeout must be confirmed | Timeout difference may affect startup sequence | Timing differs from XC6122A337ER-G | Timing differs and may include manual reset behavior | Detector delay differs; no watchdog timeout | Detector delay differs; no watchdog timeout |
| Reliability and qualification | Same manufacturer family simplifies approval | Established supervisor supplier; requires new qualification | Established PMIC supplier; redesign qualification needed | Established supervisor family; redesign qualification needed | Suitable for simpler reset systems | Suitable for simpler reset systems |
| Best-fit scenario | Lowest-risk same-family replacement path | Functional redesign needing 3.7 V plus watchdog | 3.3 V systems where watchdog is the main requirement | Redesigns needing watchdog plus manual reset-style features | Designs where only 3.7 V reset detection is needed | Designs where open-drain 3.7 V reset detection is needed |
| Main limitation | Not automatically pin-compatible with XC6122A337ER-G | Package, pinout, and timing changes | Threshold mismatch for 3.7 V applications | Threshold/output mismatch risk | Missing watchdog function | Missing watchdog function |
For the closest replacement path, first compare
XC6122A337MR-G
against the original XC6122A337ER-G schematic, footprint, pinout, watchdog timing, and reset output requirements. For functional redesigns, MCP1316MT-37LE/OT is often the most relevant candidate because it preserves the combined supervisor-plus-watchdog concept.
XC6122A337MR-G
Torex Semiconductor Ltd
IC SUPERVISOR 1 CHANNEL SOT25
95409
TPS3823-33DBVR
and
TPS3823-33DBVR
Texas Instruments
IC SUPERVISOR 1 CHANNEL SOT23-5
200000
MAX823LEUK+T
are better treated as redesign alternatives rather than direct equivalents.
MAX823LEUK+T
Analog Devices Inc./Maxim Integrated
IC SUPERVISOR 1 CHANNEL SOT23-5
17800
BD5237G-TR
and NCP303LSN37T1G are practical only when the watchdog function is unused or replaced elsewhere.
BD5237G-TR
Rohm Semiconductor
IC SUPERVISOR 1 CHANNEL 5SSOP
200000
To check availability, pricing, and sourcing options for XC6122A337ER-G replacement parts, obtain quotations through IC-Components.com or email Info@IC-Components.com.
