UTC3845G-S08-R – UTC Current Mode PWM Controller (SOP-8)

Quick Answer The UTC3845G-S08-R is a high-performance fixed frequency current-mode PWM controller from Unisonic Technologies (UTC). It is a pin-for-pin equivalent of the industry-standard UC3845, optimized for offline and DC-DC converter applications. With low startup current, excellent current mode control, and optimized UVLO thresholds, it is widely used in flyback, forward, and boost power supplies.

Current Stock at ICMASS: Strong inventory ready for immediate worldwide delivery.

Key Specifications

Why Choose UTC3845G-S08-R?

• Industry-standard pinout, fully compatible with UC3845
• Very low startup current for efficient designs
• Optimized UVLO thresholds for better performance
• High current totem-pole output drive
• Cost-effective and reliable UTC solution
• Excellent for flyback and forward converters

Typical Applications

• Offline AC/DC flyback power supplies
• Switch Mode Power Supplies (SMPS)
• Battery chargers
• LED drivers and lighting power
• DC-DC converters (boost, flyback)
• Industrial power modules
• Adapter and charger circuits
• Auxiliary power supplies

UTC3845G-S08-R Alternatives & Cross Reference

Purchasing Information at ICMASS

• Stock Status: Strong inventory available
• MOQ: 100 pieces (samples welcome)
• Lead Time: 1-3 days for stock orders
• Shipping: Fast global delivery via DHL, UPS, FedEx
• Quality Guarantee: 100% genuine UTC components with full traceability

Get Competitive Quote – Contact us today for bulk pricing and technical support.

Frequently Asked Questions (FAQ)

Q1: What is the main difference between UTC3845 and UTC3843? A: They have similar performance; UTC3845 is optimized for specific UVLO thresholds suitable for many offline converter designs.

Q2: What is the maximum switching frequency? A: Up to 500kHz, set by external resistor and capacitor.

Q3: What package does UTC3845G-S08-R use? A: Standard SOP-8 surface mount package.

Q4: Is it compatible with UC3845? A: Yes, it is a pin-to-pin compatible equivalent.

Q5: What is the startup current? A: Very low at typically 0.5mA.

Q6: Is UTC3845G-S08-R in stock at ICMASS? A: Yes, we maintain strong inventory for fast global shipping.

Q7: What topology is it mainly used for? A: Flyback, forward, and boost converters.

Q8: Can it be used in LED drivers? A: Yes, widely used in constant current LED driver power supplies.

Q9: What is the supply voltage range after startup? A: 7.6V to 30V.

Q10: Do you offer volume pricing? A: Yes, competitive tiered pricing for quantities from 1K to 100K+.

Q11: Does it have built-in protection? A: Yes, includes under-voltage lockout (UVLO) and cycle-by-cycle current limiting.

Q12: Can you provide reference circuits or design support? A: Yes, we supply the official datasheet, typical application circuits, and technical recommendations.

Related Products

• UTC3842G-S08-R / UTC3843G-S08-R / UTC3844G-S08-R
• LNK / TNY series (Power Integrations)
• Other UTC PWM Controllers
• Power MOSFETs (NCE series)