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SG6841DZ / SG6841D / SG6841 DIP-8 LCD Power Supply Controller IC (5-Pack)
SG6841DZ / SG6841D / SG6841 DIP-8 LCD Power Supply Controller IC (5-Pack)
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SG6841DZ / SG6841D / SG6841 — DIP-8 LCD Power Supply Controller IC
The SG6841 is a quasi-resonant flyback PWM controller specifically designed for LCD monitor and TV power supply units. It integrates valley-switching detection, frequency jitter for EMI reduction, and built-in protections — making it the standard replacement IC for LCD SMPS repair. This listing provides 5 pieces in DIP-8 package — new and original.
Key Specifications
| Parameter | Value |
|---|---|
| Part Numbers | SG6841DZ / SG6841D / SG6841 |
| Package | DIP-8 |
| Topology | Quasi-Resonant Flyback (QR) |
| Supply Voltage (Vcc) | 10V – 30V |
| Gate Drive Output | 500mA peak (source/sink) |
| Switching Frequency | Variable (QR valley switching) |
| Frequency Jitter | Built-in (±5% for EMI reduction) |
| Protections | OVP, OCP, OTP, SCP |
| Soft Start | Built-in |
| Operating Temperature | 0°C to +85°C |
| Quantity | 5 PCS |
Why Choose SG6841DZ?
- ✅ Quasi-resonant operation — valley switching reduces switching losses and EMI
- ✅ Built-in frequency jitter — reduces EMI without external components
- ✅ Comprehensive protection — OVP, OCP, OTP, short-circuit protection
- ✅ 500mA gate drive — directly drives power MOSFETs without external driver
- ✅ New & original — genuine SG6841 grade for reliable LCD PSU repair
Compatible With / Works With
- LCD monitor power supply boards (17–27" panels)
- LCD TV SMPS boards (32–42" entry-level panels)
- Flyback transformer topologies with N-channel MOSFET switch
- Common MOSFET replacements: 7N65, 8N65, 10N65 (TO-220)
- Optocoupler feedback: PC817 + TL431 secondary regulation
Typical Applications
- LCD Monitor PSU Repair — replace failed SG6841 in 19–24" monitor power boards
- LCD TV Power Board — quasi-resonant flyback controller for 32–42" TV SMPS
- Industrial SMPS Design — QR flyback for 12V/5V/3.3V multi-output supplies
- Adapter Repair — replacement in laptop-style 19V flyback adapters
FAQ
Q: What is the difference between SG6841DZ and SG6841D?
A: SG6841DZ is the RoHS-compliant (lead-free) variant. Electrically identical to SG6841D — direct drop-in replacement.
Q: How do I identify a failed SG6841 in an LCD PSU?
A: Common symptoms: no power output, MOSFET not switching (check gate waveform), Vcc not reaching 15V startup threshold. Measure Vcc pin (pin 8) — if stuck at startup voltage (<10V), the IC or startup resistor may be faulty.
Q: Can SG6841 replace OB2269, OB2263, or LD7552?
A: These are functionally similar QR flyback controllers but have different pinouts. Direct substitution is not possible without PCB modification. Always verify pinout before replacing.
Package Contents
- 5× SG6841DZ / SG6841D / SG6841 DIP-8 LCD Power Supply Controller IC
