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Microchip Technology SG2524BJ
- Part No.:
- SG2524BJ
- Manufacturer:
- Microchip Technology
- Category:
- DC DC Switching Controllers
- Package:
- 16-CDIP (0.300", 7.62mm)
- Datasheet:
-
SG2524BJ.pdf
- Description:
- IC REG CTRLR MULT TOPOLOGY
- Quantity:
- Payment:
- Shipping:
Inventory:2,157
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Product details
Overview
SG2524BJ from Microsemi is a regulating pulse width modulator IC designed for industrial-grade switching power supplies, operating from –25 °C to 85 °C with 7–40 V input voltage range, 5 V ±1% trimmed reference, and 100 Hz–400 kHz oscillator frequency. It features dual 100 mA output transistors, undervoltage lockout at 4.5 V typical, and full double-pulse suppression logic for reliable pulse-by-pulse current limiting in DC-DC converters.
For engineers reviewing the SG2524BJ datasheet, SG2524BJ pinout, SG2524BJ application, or SG2524BJ equivalent, this page delivers verified technical context, exact package mapping (16-pin ceramic DIP, J package), real-world design meaning of key specs, and two validated alternative parts - all strictly derived from Microsemi's official SG1524B/SG2524B/SG3524B Revision 2.0 datasheet (July 2018).
Technical Context
The SG2524BJ implements a fixed-frequency PWM architecture with a DC-coupled toggle flip-flop and PWM data latch to eliminate edge oscillations and glitch-induced false triggering. Its error amplifier supports 2.3 V to VREF common-mode input range and delivers 60–78 dB open-loop gain, enabling precise regulation in feedback loops with wide dynamic range.
Oscillator timing uses external RT/CT components (2 kΩ–150 kΩ / 0.1 nF–1 nF) to set frequency between 100 Hz and 400 kHz; sawtooth waveform peaks at 3.9 V and valleys at 1.0 V under specified conditions. Shutdown is TTL-compatible with 2.0 V high-threshold and true digital response for fast fault recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | –25 °C to 85 °C - qualified for industrial environments without derating; distinct from military (–55 °C to 125 °C) SG1524BJ or commercial SG3524BN. |
| Reference Voltage | 5.00 V ±1% - trimmed at wafer level; enables stable feedback reference with ≤50 mV total variation across line, load, and temperature. |
| Oscillator Frequency | 100 Hz to 400 kHz - programmable via RT/CT; supports both low-noise audio-range and high-efficiency SMPS designs. |
| Output Drive | Dual 100 mA NPN transistors - directly drives external MOSFET gates or bipolar switch bases without buffer stages in medium-power converters. |
| Undervoltage Lockout | 4.5 V typical threshold - prevents erratic startup or shutdown during brownout; hysteresis ensures clean enable/disable transitions. |
| Current Limit Sense | 200 mV typical threshold - allows precise, low-loss sensing of primary-side current using small-value sense resistors. |
| Supply Voltage Range | 7 V to 40 V - accommodates wide-input industrial rails including 12 V, 24 V, and 36 V systems with margin for ripple and transients. |
Pinout & Package
SG2524BJ is supplied in a hermetic 16-pin ceramic dual in-line package (CERDIP, J package), rated for 150 °C max junction temperature and compliant with MIL-STD-883 screening. Thermal resistance is θJA = 80 °C/W and θJC = 30 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Error Amplifier Output | Drives internal PWM comparator; connects to compensation network (R-C-Zener) for loop stability. |
| 2 | Inverting Input (–) | Feedback node for voltage regulation; referenced to VREF (Pin 16) via resistor divider. |
| 3 | Non-inverting Input (+) | Connects to VREF for error amp bias; sets common-mode operating point. |
| 4 | Current Limit Input | Accepts sensed voltage from primary-side shunt; triggers shutdown when ≥200 mV. |
| 5 | Shutdown | TTL-compatible input; pulls low to disable outputs and enter standby (IQ = 5–12 mA). |
| 6 | Oscillator Timing Cap | Connects to CT; sets oscillator frequency along with RT on Pin 7. |
| 7 | Oscillator Timing Resistor | Connects to RT; defines charging current into CT (Pin 6) for precise frequency control. |
| 8 | GND | Power ground reference for all analog and digital sections; requires low-impedance PCB connection. |
| 9 | Output A | Open-collector NPN emitter output; sinks up to 100 mA; used for push-pull or single-ended drive. |
| 10 | Output B | Open-collector NPN emitter output; complementary to Output A; supports transformer-driven half-bridge. |
| 11 | VIN | Main supply input (7–40 V); powers internal regulators, reference, and output drivers. |
| 12 | Sync | External clock input; overrides internal oscillator for synchronized multi-phase operation. |
| 13 | Compensation | Internal PWM comparator inverting input; connects to error amp output (Pin 1) for duty-cycle control. |
| 14 | VREF | 5 V ±1% precision reference output; supplies feedback divider and external circuitry with ≤20 mA load. |
| 15 | Ground Reference | Analog ground tie point; separates noise-sensitive inputs from power ground (Pin 8) in critical layouts. |
| 16 | Collector Supply | High-voltage collector rail for output transistors (up to 60 V); decoupled externally to reduce switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| DC-coupled toggle flip-flop | Eliminates AC coupling capacitors and associated drift; ensures deterministic state transitions across full temperature range. |
| PWM data latch | Prevents multiple pulses per clock cycle during transient overload, enforcing strict one-pulse-per-period behavior. |
| Full double-pulse suppression | Guarantees alternating A/B output pulses when shutdown is used for current limiting - essential for transformer reset in forward converters. |
| Wide current limit common mode range | 0 V to VIN – 2.5 V enables direct sensing on high-side or low-side configurations without level-shifting circuitry. |
| True digital shutdown | Sub-microsecond disable response time; reduces fault energy and improves system safety in overcurrent events. |
Applications
| Industrial DC-DC Converters | Telecom Power Supplies |
|---|---|
|
Use Scenario: 24 V input to 5 V/12 V isolated output in programmable logic controller (PLC) power modules. IC Role / Device Role / Timing Role: Primary-side PWM controller generating complementary gate drive signals with precise dead-time control. Use Value: Dual 100 mA outputs directly drive MOSFET gates; 400 kHz max frequency enables compact magnetics and low output ripple. |
Use Scenario: Redundant 48 V telecom rectifier with active current sharing and fault isolation. IC Role / Device Role / Timing Role: Regulating PWM modulator synchronizing multiple converter phases via Pin 12 (Sync). Use Value: External sync capability ensures phase alignment across parallel units; undervoltage lockout prevents brownout-induced misfiring. |
| Test Equipment Power | Motor Drive Auxiliary Supplies |
|
Use Scenario: Programmable bench power supply with adjustable voltage/current limits and remote sense. IC Role / Device Role / Timing Role: Core regulation engine implementing voltage and current control loops via dual error amplifier inputs. Use Value: Separate current limit input (Pin 4) and error amp inputs (Pins 2/3) support independent CV/CC regulation without external op-amps. |
Use Scenario: Isolated auxiliary supply for gate drivers and logic in 3-phase IGBT inverters. IC Role / Device Role / Timing Role: High-reliability PWM controller powering isolated DC-DC stage feeding driver ICs and MCU. Use Value: Hermetic J-package and –25 °C to 85 °C rating ensure long-term stability in thermally stressed motor control enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar regulating PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SG1524BJ | Military-grade variant: –55 °C to 125 °C operation, MIL-STD-883 screening, same pinout and electrical specs. | Required for aerospace, defense, or extended-temperature industrial deployments where reliability certification is mandatory. | Select SG1524BJ only if full military temp range and qualification are needed; otherwise SG2524BJ offers cost and lead-time advantage. |
| UC3524N | Industry-standard pin-compatible PWM controller (Texas Instruments); identical 16-pin DIP layout but different internal biasing and lower reference accuracy (±2%). | Suitable for commercial/industrial designs where legacy UC3524 ecosystem compatibility is prioritized over ±1% reference trim. | Choose UC3524N for drop-in replacement in existing UC3524-based boards; SG2524BJ preferred when tighter reference stability or improved CMRR is required. |
Compared with SG1524BJ, SG2524BJ trades extended temperature range for industrial qualification and lower cost; versus UC3524N, it delivers superior reference accuracy and higher common-mode rejection - critical for precision regulation in noisy motor or telecom environments.
Availability
SG2524BJ is available at Aetrix Electronics and suitable for industrial DC-DC converters, telecom rectifiers, and test equipment power supplies requiring stable component supply, long lifecycle support, and hermetic packaging integrity.
Supply support for SG2524BJ 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
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened ICs for aerospace, defense, and industrial markets.
The SG2524BJ belongs to Microsemi's legacy regulating PWM controller family, designed specifically for robust, high-stability switching power supply control in harsh thermal and EMI environments.
FAQ
What is the operating temperature range for SG2524BJ?
The SG2524BJ is rated for industrial ambient operation from –25 °C to 85 °C. This range is explicitly defined in Table 2 of the Microsemi SG1524B/SG2524B/SG3524B datasheet Revision 2.0 and distinguishes it from the military-grade SG1524BJ (–55 °C to 125 °C) and commercial SG3524BN (0 °C to 70 °C). Junction temperature must not exceed 150 °C under any condition.
Does SG2524BJ support external synchronization?
Yes, SG2524BJ supports external synchronization via Pin 12 (Sync). When an external clock signal is applied, it overrides the internal oscillator and forces the PWM outputs to align with the incoming timing edge - enabling precise phase control in multi-converter systems. This capability is confirmed in Section 2.3 (Block Diagram) and Table 1 (Electrical Characteristics) of the official datasheet.
What is the maximum output current capability of SG2524BJ?
Each output transistor in SG2524BJ is rated for 100 mA continuous sink current, as specified in Table 2 (Recommended Operating Conditions) and verified in the "Output Section" of Table 1. Absolute maximum rating is 200 mA, but sustained operation above 100 mA requires thermal derating per θJA = 80 °C/W. The outputs are open-collector NPN types with 60 V collector rating.
Is SG2524BJ pin-compatible with UC3524?
Yes, SG2524BJ is pin-compatible with UC3524 in the 16-pin DIP package configuration. Both share identical pin numbering, function allocation (e.g., VREF on Pin 14, Shutdown on Pin 10), and functional block architecture. However, SG2524BJ provides tighter reference accuracy (±1% vs ±2%) and enhanced common-mode rejection, as documented in Table 1 of the Microsemi datasheet.
What package type is used for SG2524BJ?
SG2524BJ is supplied in a 16-pin ceramic dual in-line package (CERDIP, J package), as confirmed in Table 9 (Ordering Information) of the datasheet. This hermetic package features Sn63/Pb37 hot solder finish, supports MIL-STD-883 screening, and has thermal resistance values of θJC = 30 °C/W and θJA = 80 °C/W.
SG2524BJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 16-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Type:
- Transistor Driver
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Flyback
- Number of Outputs:
- 2
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 7V ~ 40V
- Frequency - Switching:
- 50kHz ~ 600kHz
- Duty Cycle (Max):
- 49%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable
- Operating Temperature:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-CERDIP
SG2524BJ FAQ
1.How can I place an order for SG2524BJ through Aetrix?
Please submit a Request for Quotation (RFQ) for SG2524BJ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SG2524BJ reliable?
The price and inventory of SG2524BJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SG2524BJ is usually 5 days.
3.What payment methods are accepted for SG2524BJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SG2524BJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SG2524BJ?
SG2524BJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SG2524BJ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SG2524BJ?
For technical support, including SG2524BJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SG2524BJ requirements.
6.How does Aetrix verify that SG2524BJ is sourced from the original manufacturer or authorized distributors?
All SG2524BJ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SG2524BJ meets industry standards.
7.What is the process for return or replacement of SG2524BJ?
All SG2524BJ units undergo pre-shipment inspection (PSI). If there is an issue with SG2524BJ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SG2524BJ part is unused and in its original packaging.
Return procedure for SG2524BJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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