SGR137L

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The SGR137L is a negative adjustable linear regulator from the SGR137 family, manufactured by Microsemi Corporation. It delivers up to 0.5A output current over an output voltage range of -1.2V to -37V. The device features a 2% maximum output voltage error and includes internal current limiting, power limiting, and thermal limiting for overload protection. It operates within an ambient temperature range of -55°C to 125°C and utilizes a 20-pin ceramic leadless chip carrier (LCC) package.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Radiation-tolerant design with guaranteed performance after exposure to Total Ionizing Dose (TID), Enhanced Low Dose Rate Sensitivity (ELDRS), and Single Event Latch-up (SEL).
• Integrated internal current, power, and true thermal limiting prevents device damage during overloads or shorts without requiring external heat sinks.
• High reliability construction suitable for harsh environments, featuring hermetic packaging options and compliance with MIL-PRF-38535 Class V processing.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Aerospace systems requiring radiation-hardened power management
• Defense and security electronics operating in high-radiation environments
• Military-grade instrumentation and control circuits

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify that the specific ordering suffix corresponds to the required radiation tolerance level and package variant. Confirm that the procurement channel sources parts compliant with MIL-PRF-38535 Class V processing if high-reliability specifications are mandated. Ensure the component matches the exact pinout and thermal characteristics defined for the 20-pin LCC configuration.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select the SGR137L when radiation hardness is critical for negative voltage regulation applications. This model provides a 0.5A current limit, which is lower than the 1.5A variants available in TO-3 or TO-257 packages; verify load requirements against this limit. The LCC package offers a compact footprint but requires careful thermal management due to higher thermal resistance compared to metal can packages.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

The SGR137L belongs to the SGR137/SGR137A family of negative adjustable regulators. These devices are designed as fit, form, and function compatible replacements for the SG137/SG137A series, with added guarantees for radiation exposure performance. The family complements positive adjustable regulators like the SGR117A, allowing for dual tracking supply designs.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

The SGR137L is functionally compatible with the SG137L. When substituting, ensure the replacement part meets the same radiation tolerance specifications (TID, ELDRS, SEL) and adheres to the MIL-PRF-38535 Class V processing requirements if applicable.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators FAQ

What is the maximum output current for the SGR137L?

The SGR137L has a maximum output current of 0.5A.

How does the SGR137L handle short circuits?

Internal current and power limiting coupled with true thermal limiting prevent device damage even if the regulator is shorted or not attached to a heat sink.

Is the SGR137L radiation tolerant?

Yes, the SGR137 family is radiation-tolerant, with guaranteed performance after exposure to TID, ELDRS, and SEL conditions.