UC3525AJ Texas Instruments Integrated Circuit (Ceramic Dual-In-Line Packages) In Stock
The UC3525AJ is a voltage-mode PWM controller IC from Texas Instruments capable of switching up to 400 kHz with 400 mA output drive and an 8-40V input supply range, housed in a 16-pin ceramic CDIP package. It implements pulse-width modulation control for offline and DC-DC switching power supplies. Available from distributors worldwide for immediate or scheduled delivery.
- Manufacturer
- Texas Instruments
- Package
- Ceramic Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- UC3525AJ Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Voltage-mode PWM control with programmable oscillator up to 400 kHz enables high-frequency compact power supply designs
- 400 mA peak output drive per totem-pole output directly drives power MOSFET or bipolar transistor gates without external buffers
- Wide 8V to 40V input supply range accommodates diverse power bus architectures from automotive to industrial
- 16-pin ceramic CDIP (R-GDIP-T16) package provides superior thermal stability and reliability for harsh-environment and mil-spec applications
Applications
The UC3525AJ is a foundational controller for offline flyback, forward, and push-pull switching power supplies in industrial automation, telecommunications infrastructure, and defense electronics. Its voltage-mode PWM architecture and dual complementary outputs make it ideal for half-bridge and full-bridge converter designs operating from 8V to 40V input rails at frequencies up to 400 kHz. The ceramic DIP package also suits high-reliability and military-grade applications where temperature extremes and long service life are required.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | VOLTAGE-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 40V |
| Input Voltage-Min | 8V |
| Input Voltage-Nom | 20V |
| JESD-30 Code | R-GDIP-T16 |
| JESD-609 Code | e0 |
| Number of Functions | 1 |
| Output Current-Max | 0.5A |
| Output Voltage-Max | 5.2V |
| Output Voltage-Min | 5V |
| Output Voltage-Nom | 5.1V |
| Package Body Material | CERAMIC, GLASS-SEALED |
| Package Equivalence Code | DIP16,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Qualification Status | Not Qualified |
| Supply Current-Max (Isup) | 20mA |
| Supply Voltage-Max (Vsup) | 40V |
| Supply Voltage-Min (Vsup) | 8V |
| Surface Mount | NO |
| Switcher Configuration | PUSH-PULL |
| Switching Frequency-Max | 500kHz |
| Technology | BIPOLAR |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | Tin/Lead (Sn/Pb) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Package | Ceramic Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for UC3525AJ:
Switching Controller, Voltage-mode, 0.5A, 400kHz Switching Freq-Max, PDIP16
Frequently Asked Questions
What is the maximum switching frequency of the UC3525AJ?
The UC3525AJ supports a maximum oscillator frequency of 400 kHz, which is set by an external resistor-capacitor network connected to the RT and CT pins. Higher switching frequencies allow the use of smaller magnetic components and output capacitors, enabling more compact power supply designs.
What input voltage range does the UC3525AJ support?
The UC3525AJ operates from a supply voltage of 8V minimum to 40V maximum, with a nominal design point of 20V. This wide input range makes it suitable for a broad variety of applications including 12V automotive systems, 24V industrial buses, and 28V aerospace power rails.
What package does the UC3525AJ use and what makes it unique?
The UC3525AJ uses a 16-pin ceramic DIP package (JESD-30 code R-GDIP-T16). Unlike plastic DIP variants, the ceramic package offers superior moisture resistance, wider operating temperature range, and enhanced mechanical durability, making it the preferred choice for military, aerospace, and high-reliability industrial applications.
What control mode does the UC3525AJ implement?
The UC3525AJ implements voltage-mode pulse-width modulation (PWM) control. In voltage-mode control, the output voltage error is fed back directly to the PWM comparator to regulate duty cycle. This approach simplifies compensation design and provides good noise immunity compared to peak current-mode control in certain topologies.
What power supply topologies is the UC3525AJ suitable for?
The UC3525AJ is designed to control push-pull, half-bridge, and full-bridge converter topologies thanks to its complementary dual output stages with programmable dead-time. It is also used in single-ended forward and flyback converters. Output drive capability of 400 mA per channel allows direct gate drive of power MOSFETs and bipolar transistors.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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