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BLF861A
BLF861A
| Part Number | BLF861A |
|---|---|
| Manufacturer | Ampleon / NXP Semiconductors |
| Category | Discrete Semiconductor Products / Transistors > RF FETs, MOSFETs |
| Description | UHF Power LDMOS Transistor, 470 MHz to 860 MHz Frequency Range, 150W CW Power Output, SOT540A Flange Package. |
| Stock Status | In Stock |
| Origin | Original Factory |
Product Overview
BLF861A is an N-channel enhancement-mode LDMOS RF transistor from Ampleon (formerly NXP/Philips). Optimized for 470–860 MHz UHF broadcast & industrial RF use, it delivers 150W CW output (170W PAL peak). With high gain, efficiency and anti-mismatch robustness, the SOT540A packaged device with internal matching fits high-power transmitter applications reliably.
Core Advantages
Broadband UHF Performance
Covers 470–860 MHz UHF band, tolerates 10:1 VSWR full-phase load mismatch with flat gain across frequencies.
High Power & Efficiency
150W CW / 170W PAL peak output, high drain efficiency cuts system heat and power consumption.
Superior Linearity
Low intermodulation distortion, compliant with DVB-T, ATSC, ISDB-T digital TV standards.
Effective Thermal Dissipation
SOT540A ceramic flange package, 0.55 K/W junction-to-base thermal resistance for fast heat transfer.
Easy Circuit Design
Built-in input/output matching eliminates extra DC isolators, simplifying peripheral circuits.
Key Specifications
| Brand | Ampleon / NXP Semiconductors |
|---|---|
| RoHS Status | RoHS Compliant / Lead-Free |
| EDA / CAD | PCB Footprint & 3D Model Available upon Request |
| Warranty | 1-Year Standard Quality Warranty |
| Package / Case | SOT540A / Ceramic Flange Package |
| Mounting Type | Chassis Mount / Bolt-Down Flange Mount |
| Surface Marking / Silkscreen | BLF861A |
| Transistor Type | LDMOS (N-Channel Enhancement-Mode) |
| Operating Frequency Range | 470 MHz to 860 MHz (UHF Band) |
| Continuous Output Power (Pout) | 150 W (Continuous Wave, CW); PAL peak sync 170W |
| Power Gain (Gp) | 13.5~14.5 dB (Typical 14.5 dB @ 860 MHz, >14dB min) |
| Drain Efficiency (ηD) | ≥50% (CW Typical), ≥40% (PAL sync) |
| Drain-Source Voltage (VDSS) | 65 V (Max Rating), 32V (Nominal Operating) |
| Gate-Source Voltage (VGS) | -0.5 V to +11 V (operating range); ±15V absolute maximum |
| Continuous Drain Current (ID) | 18 A (total device) |
| Total Power Dissipation (Ptot) | 318 W (Tc=25℃) |
| Junction Temperature (Tj) | Up to +200°C; Storage temperature: -65℃ ~ +150℃ |
| Thermal Resistance (Rth j-mb) | 0.55 K/W (junction to mounting base) |
| Static Drain Current (IDQ) | 1 A per channel, dual push-pull structure |
| Load Mismatch Capability | Withstand VSWR 10:1 full phase load mutation at rated power |
Typical Applications
- UHF Analog and Digital Television Transmitters (DVB-T, ATSC, ISDB-T, PAL BG)
- High-Power UHF Mobile Radio Base Stations and Repeaters
- Industrial, Scientific, and Medical (ISM) RF Power Generators
- UHF Band Linear Driver and Final Output Amplifier Stages
- RF Test and Measurement Signal Amplification Systems
Order & Shipping Info
| Minimum Order Quantity (MOQ) | 1 Piece |
|---|---|
| Shipping Time | Shipped within 1-2 business days |
| Delivery Time | 3-7 working days worldwide |
| Shipping Methods | DHL, UPS, FedEx, EMS |
| Payment Methods | T/T (Bank Transfer), PayPal, Credit Card, Western Union |
Technical Support
For datasheet, sample requests, stock check, or bulk pricing, please use the Quick Inquiry form. We will reply within 24 hours.
Frequently Asked Questions
Q1: What frequency range does BLF861A support?
A: It is optimized for 470–860 MHz UHF TV broadcast band.
Q2: What is the rated power of BLF861A?
A: 150W CW output at 32V DC, PAL peak sync power reaches 170W.
Q3: How to cool BLF861A properly?
A: Mount flange on flat heat sink with thermal grease; heat sink thermal resistance ≤0.15 K/W is recommended.
Q4: How to get datasheets or bulk quotes?
A: Submit inquiry via our quick inquiry form for datasheets, stock and bulk pricing.
Q5: What are pin-compatible substitutes for BLF861A?
A: BLF861B (rugged upgraded version); BLF860A (100W lower power); BLF878 (300W higher power).
Q6: What’s the difference between BLF861A and BLF861B?
A: BLF861B has better load mismatch tolerance and reliability, same package/pinout, fully interchangeable.
Q7: Can BLF861A work outside 470–860MHz?
A: No, performance degrades greatly out of this band, not recommended for other frequencies.
Q8: Is BLF861A single-ended or push-pull?
A: It is a dual push-pull LDMOS device with 2 drains, 2 gates, common source connected to flange.
Q9: Are there counterfeit BLF861A on the market?
A: Yes, imitations exist; genuine parts follow Ampleon/NXP Rev3 (2015) datasheet.
Q10: Can BLF861A replace BLF177R?
A: No, BLF177R is for VHF band, different frequency and package, direct substitution is not allowed.
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