HMC921LP4E Obsolete 0.4–2.7GHz 2W RF Amplifier In Stock
The HMC921LP4E is a high-linearity GaAs HBT MMIC power amplifier originally developed by Hittite Microwave, now part of Analog Devices. It supports RF and IF applications from 0.4GHz to 2.7GHz.
The official HMC921LP4E datasheet marks the device as obsolete. Remaining stock may still be sourced for legacy wireless equipment, RF board repair and existing production requirements.
HMC921LP4E Specifications
| Parameter | Specification |
| Manufacturer | Analog Devices / Hittite |
| Lifecycle | Obsolete |
| Technology | GaAs HBT MMIC |
| Frequency range | 0.4GHz to 2.7GHz |
| Gain | Up to 16dB typical at 900MHz |
| Output P1dB | Up to +33dBm, band dependent |
| Saturated output power | Approximately +34 to +35dBm |
| Output IP3 | Up to +48dBm |
| Power-added efficiency | Up to 32% |
| Supply voltage | +5V |
| Bias current | Adjustable 400mA or 700mA modes |
| Package | 24-lead 4×4mm QFN |
| Operating temperature | −40°C to +85°C |
| Package marking | H921 |
Is HMC921LP4E Really a 2W Amplifier?
Yes. An output power of +33dBm is approximately 2 watts. The HMC921LP4E can reach about +33dBm P1dB in selected frequency bands and bias conditions.
Actual gain and output power vary with operating frequency, bias current and external matching components. Designers should use the performance table for their specific frequency band rather than assuming identical performance across the full range.
Band-Specific RF Matching
HMC921LP4E requires external input and output matching components. The datasheet provides separate application circuits for bands including:
350–500MHz
800–1000MHz
1.8–2.0GHz
2.0–2.2GHz
2.5–2.8GHz
A single matching network should not be assumed to provide optimum performance across the complete 0.4–2.7GHz range.
Applications
HMC921LP4E is commonly used in:
Cellular and 3G infrastructure
WiMAX and LTE equipment
Fixed wireless systems
WLAN equipment
CATV and cable modems
Microwave radio
RF test equipment
RF and IF driver stages
Replacement Considerations
ADI does not specify a guaranteed drop-in replacement in the archived datasheet. An alternative amplifier should be compared for:
Required frequency band
P1dB and saturated output power
Gain and OIP3
5V supply and bias current
4×4mm QFN footprint
Enable and detector functions
External RF matching network
Even if another amplifier has similar frequency and power ratings, PCB and matching-network changes may still be necessary.
HMC921LP4E Stock and RFQ
For obsolete-stock inquiries, please provide:
Part number: HMC921LP4E
Required quantity
Preferred date code
Original packaging requirements
Testing or traceability requirements
Delivery country
Stock, price, date code and lead time will be confirmed with each RFQ.
FAQ
Is HMC921LP4E obsolete?
Yes. The Analog Devices datasheet officially identifies HMC921LP4E as obsolete.
What output power does HMC921LP4E provide?
It provides up to approximately +33dBm P1dB, equivalent to about 2W. Saturated output power can reach approximately +34 to +35dBm.
Does it cover 0.4–2.7GHz with one matching circuit?
Not necessarily. The device supports this overall frequency range, but different external matching circuits are recommended for each operating band.
What supply voltage does HMC921LP4E require?
It operates from a single +5V supply. The quiescent current can be adjusted using an external resistor.
What package does HMC921LP4E use?
It uses a RoHS-compliant 24-lead 4×4mm QFN package with the top marking H921.
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