The UC1842A/3A/4A/5A family of control ICs is a pin-for-pin compatible improved version of the UC3842/3/4/5 family. Providing the necessary features to control current mode switched mode power supplies, this family has the following improved features. Start up current is guaranteed to be less than 0.5 mA. Oscillator discharge is trimmed to 8.3 mA. During under voltage lockout, the output stage can sink at least 10 mA at less than 1.2 V for VCC over 5 V.

• Controlled Baseline
• One Assembly/Test Site, One Fabrication Site
• Extended Temperature Performance of –55°C to 125°C
• Enhanced Diminishing Manufacturing Sources (DMS) Support
• Enhanced Product Change Notification
• Qualification Pedigree(1)
• Optimized for Off-line and DC-to-DC Converters
• Low Start Up Current (<0.5 mA)
• Trimmed Oscillator Discharge Current
• Automatic Feed Forward Compensation
• Pulse-by-Pulse Current Limiting
• Enhanced Load Response Characteristics
• Under-Voltage Lockout With Hysteresis
• Double Pulse Suppression
• High Current Totem Pole Output
• Internally Trimmed Bandgap Reference
• 500 kHz Operation
• Low RO Error Amp

(1) Component qualification in accordance with JEDEC and industry standards to ensure reliable operation over an extended temperature range. This includes, but is not limited to, Highly Accelerated Stress Test (HAST) or biased 85/85, temperature cycle, autoclave or unbiased HAST, electromigration, bond intermetallic life, and mold compound life. Such qualification testing should not be viewed as justifying use of this component beyond specified performance and environmental limits.

• Topology
• Boost, Flyback, Forward
• Duty cycle (Max) (%)
• 100
• Supply voltage (Max) (V)
• 25
• UVLO thresholds on/off (V)
• 16/10
• Features
• Error Amplifier, Multi-topology
• Operating temperature range (C)
• -55 to 125
• Rating
• HiRel Enhanced Product
• Frequency (Max) (kHz)
• 500
• Gate drive (Typ) (A)
• 1

UC1842A-EP的完整型号有：UC1842AMDREP、V62/03625-01YE，以下是这些产品的关键参数及官网采购报价：

UC1842AMDREP，工作温度：-55 to 125，封装：SOIC (D)-8，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网UC1842AMDREP的批量USD价格：2.552（1000+）

V62/03625-01YE，工作温度：-55 to 125，封装：SOIC (D)-8，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网V62/03625-01YE的批量USD价格：2.552（1000+）

UC1842AMDREP，工作温度：-55 to 125，封装：SOIC (D)-8，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网UC1842AMDREP的批量USD价格：2.552（1000+）

V62/03625-01YE，工作温度：-55 to 125，封装：SOIC (D)-8，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网V62/03625-01YE的批量USD价格：2.552（1000+）