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MRF454
MRF454
| Part Number | MRF454 |
|---|---|
| Manufacturer | Motorola / MACOM |
| Category | Discrete Semiconductor Products > Transistors > Bipolar (BJT) > RF Transistors |
| Description | 80W NPN Silicon Epitaxial Planar RF Power Transistor, 2-30MHz HF Band, 12.5V Low Voltage Operation, Flange Mount Hermetic Ceramic Package. |
| Stock Status | In Stock |
| Origin | Original Factory |
Product Overview
The MRF454 is an NPN silicon epitaxial planar RF power transistor originally designed by Motorola, now supplied by MACOM and NXP. It targets linear SSB and CW HF power amplifiers covering 2 MHz ~ 30 MHz. Operating at 12.5 V nominal supply, it provides minimum 80W PEP/CW output power with typical 50% collector efficiency. Built-in emitter ballast resistors enhance tolerance to VSWR mismatch and prevent thermal runaway. Packaged in a 4-lead hermetic ceramic flange housing, it is widely used in marine, mobile, amateur radio and industrial HF communication devices.
Core Advantages
12.5V Low Voltage Operation
Compatible with 12.5V/13.6V battery power for mobile radio systems, eliminating high voltage boost circuits.
Stable 80W Minimum Output Power
Delivers guaranteed 80W PEP/CW output @30 MHz, consistent performance across full 2~30 MHz HF band.
Anti-Mismatch Thermal Stability
Integrated emitter ballast resistors balance current, improving resistance to antenna load mismatch.
Hermetic Ceramic Flange Package
Case 211-11 (Style 2, 4 leads) airtight packaging with excellent heat dissipation for long-duration continuous operation.
Key Specifications
| Brand | Motorola / MACOM |
|---|---|
| RoHS Status | RoHS Compliant Option Available |
| EDA/CAD | Symbol, Footprint & 3D Model Available |
| Warranty | 1-Year Standard Quality Warranty |
| Package / Case | Case 211-11 (Style 2 / Flange Mount Hermetic Ceramic, 4 Leads) |
| Mounting Type | Chassis Mount / Flange Bolt-Down Mounting |
| Surface Marking / Silkscreen | MRF454 Marking |
| Transistor Type | NPN Silicon Epitaxial Planar RF Power Transistor |
| Frequency Range | 2 MHz to 30 MHz (HF Band) |
| Output Power | 80 W PEP / CW (Min. at VCC = 12.5V, f = 30MHz) |
| Supply Voltage | 12.5 V DC Nominal (VCBO = 45V, VCEO = 25V, VEBO = 4V) |
| Power Gain | Min. 12 dB at 30 MHz |
| Collector Efficiency | 50% (Typical) |
| Intermodulation Distortion | Typ. -30 dB or better at 80W PEP |
| Continuous Collector Current (Ic) | 20 A |
| Total Power Dissipation (Pd) | 250 W (@Tc=25°C) |
| Operating Junction Temperature | -65°C to +200°C |
| Packaging Format | Tray / Anti-Static Protective Box |
Typical Applications
- 12.5V mobile and marine HF radio SSB / CW transmitters
- Amateur radio HF linear power amplifiers (160m ~10m band)
- Commercial & tactical HF communication equipment
- HF industrial RF signal source & power excitation amplifier
Order & Shipping Info
| Minimum Order Quantity (MOQ) | 1 Piece |
|---|---|
| Processing Time | Shipped within 1-2 business days |
| International Shipping Options | DHL, UPS, FedEx, EMS |
| Payment Terms | T/T (Bank Transfer), PayPal, Credit Card, Western Union |
Technical Support
Contact us for datasheet download, sample application circuit, BOM quotation and bulk pricing via inquiry form. We will reply within 24 hours.
Frequently Asked Questions
Q1: What is the recommended operating voltage for MRF454?
A1: Nominal operating voltage is 12.5V DC. It supports standard 13.6V vehicle battery supply. Do not exceed the absolute maximum VCEO rating of 25V.
Q2: Can MRF454 directly replace MRF455?
A2: Not plug-and-play. MRF454 uses Case 211-11 (Style 2) package, while MRF455 adopts Case 211-07 (Style 1). Flange dimensions and pinout differ significantly. PCB modification is required for cross replacement.
Q3: What alternatives exist for this 12V 80W HF RF transistor?
A3: Common alternatives include MRF422 and SD1446. Note that SD1446 has lower power margin, and MRF422 features different gain characteristics. Circuit re-tuning is necessary after replacement.
Q4: What frequency range is the MRF454 designed for?
A4: Optimized for 2 MHz ~ 30 MHz full HF band. Performance will degrade sharply above 30 MHz and it cannot be used for VHF/UHF applications.
Q5: Why do some platforms mark VCEO=18V for MRF454?
A5: VCEO=18V is incorrect outdated data. Official Motorola and MACOM datasheets confirm the absolute maximum VCEO = 25V. All our specifications follow official documents.
Q6: Is a heatsink required when running MRF454 at full 80W power?
A6: Mandatory. Continuous full-power operation requires a sufficient heatsink with thermal grease. Insufficient cooling will cause overheating and permanent damage to the transistor.
Q7: Can MRF454 work for digital modes such as FT8?
A7: Yes. Good linearity and intermodulation performance make it suitable for SSB, CW and low-duty-cycle digital amateur radio modes including FT8.
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