Microchip Technology SG1524J-JAN

Overview

SG1524J-JAN from Microchip Technology is a military-grade regulating pulse width modulator IC for DC-DC switching power supplies, featuring dual 50 mA output transistors, 5 V reference with 0.4% load/line regulation, 100 Hz–300 kHz oscillator range, and operation from –55 °C to +125 °C in a hermetic 16-pin ceramic DIP package. It enables transformer-coupled converters, polarity inverters, and voltage doublers in harsh-environment avionics and defense systems.

For engineers reviewing the SG1524J-JAN datasheet, SG1524J-JAN pinout, SG1524J-JAN application, or SG1524J-JAN equivalent, this page delivers verified military-spec parameters, exact J-package thermal data (θJA = 80 °C/W), confirmed current-limit threshold (200 mV), push-pull vs. single-ended output configuration logic, and direct alternatives compliant with MIL-M38510/12601BEA.

Technical Context

The SG1524J-JAN integrates a precision 5 V bandgap reference, error amplifier (72 dB open-loop gain, 1 MHz GBW), oscillator with external RT/CT timing, PWM comparator, pulse-steering flip-flop, and dual NPN output transistors-enabling both single-ended (0–90% duty) and push-pull (0–45% per output, ½ oscillator frequency at transformer) topologies. Its current-limit amplifier operates at ~200 mV sense threshold with ±0.3 V common-mode range, requiring ground-referenced sensing.

Designed for full-military temperature operation, it includes shutdown control (0.2–1.8 V threshold), thermal protection via junction-to-case resistance of 30 °C/W, and radiation-tolerant Level "S" processing per MIL-STD-883. The oscillator supports external sync with 200 ns minimum pulse width and locks at 90% of external clock frequency when driven on Pin 3.

Key Specifications

Pinout & Package

SG1524J-JAN uses a 16-pin hermetic ceramic dual-in-line package (J-package) with 0.100" lead pitch, 0.760" × 0.220" body, and Pb37/Sn63 solder finish. Thermal resistance is θ_JC = 30 °C/W and θ_JA = 80 °C/W under still-air conditions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar regulating PWM controller applications.

Compared with SG2524J and UC3844BD1R2G, SG1524J-JAN uniquely delivers full-military temperature operation, integrated dual-output logic with guaranteed dead time, and factory-trimmed 200 mV current limit - eliminating calibration and layout compromises in mission-critical power systems.

Availability

SG1524J-JAN is available at Aetrix Electronics and suitable for avionics power supplies, ground vehicle DC-DC converters, spacecraft battery chargers, and military radar power modules requiring stable component supply across extended temperature and radiation environments.

Supply support for SG1524J-JAN includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a global semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with a focus on high-reliability and embedded control solutions.

The SG1524J-JAN belongs to Microchip's legacy regulating PWM controller product line, designed specifically for ruggedized DC-DC conversion in defense, aerospace, and industrial systems demanding MIL-STD compliance and hermetic packaging.

FAQ

What is the maximum allowable input voltage for SG1524J-JAN?

The absolute maximum input voltage (+VIN) for SG1524J-JAN is 42 V DC, with recommended operation between 8 V and 40 V. Exceeding 42 V risks permanent damage to internal circuitry, including the reference generator and output transistors. This rating applies across the full –55 °C to +125 °C ambient range and is validated per MIL-STD-883 test method 301.1.

Does SG1524J-JAN support external clock synchronization?

Yes, SG1524J-JAN supports external clock synchronization via Pin 3 (CLK). A positive TTL-compatible pulse (min 200 ns width, 0–5 V levels) applied to this pin will lock the internal oscillator to the external source when the free-running frequency is set to 90% of the sync frequency. The nominal input resistance is 3.2 kΩ ±25%, and the pin must never be driven below –0.3 V or above +5.0 V.

What is the current-limit threshold voltage of SG1524J-JAN and how is it implemented?

The current-limit threshold voltage of SG1524J-JAN is 200 mV ±10 mV at TJ = 25 °C, implemented via an internal matched transistor pair (Q1/Q2) and precision resistor R2. This fixed threshold requires current sensing in the ground-return path, with strict ±0.3 V common-mode range on Pins 4 (CL–) and 5 (CL+). Bias currents of ~150 µA flow out of these pins, necessitating source impedances <50 Ω for <5% threshold error.

Can SG1524J-JAN be used in single-ended versus push-pull configurations?

Yes, SG1524J-JAN supports both topologies. In single-ended mode, Outputs A and B are wire-ORed to achieve 0–90% duty cycle at oscillator frequency. In push-pull mode, outputs are used separately - the internal flip-flop divides frequency by two, delivering complementary 0–45% duty signals to each output, resulting in full-cycle transformer excitation at ½ oscillator frequency.

What package type and thermal characteristics define SG1524J-JAN?

SG1524J-JAN uses a hermetic 16-pin ceramic dual-in-line package (J-package) with Pb37/Sn63 solder finish. Its thermal resistance is θ_JC = 30 °C/W and θ_JA = 80 °C/W under still-air conditions. This package meets MIL-M38510/12601BEA and supports junction temperatures up to 150 °C, making it suitable for conduction-cooled military chassis applications.