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HMC478ST89ETR
HMC478ST89ETR
| Part Number | HMC478ST89ETR |
|---|---|
| Manufacturer | Analog Devices Inc. / Hittite |
| Category | RF & Wireless > RF Amplifiers > Gain Block / MMIC Amplifiers |
| Description | InGaP HBT Gain Block MMIC Amplifier, DC‑4 GHz, 22 dB Gain, +30 dBm OIP3, SOT‑89 Package, Obsolete EOL part, stock only. |
| Stock Status | In Stock (Obsolete EOL, inventory stock only) |
| Origin | Original Factory |
Product Overview
The HMC478ST89ETR is an InGaP HBT MMIC gain‑block amplifier from Analog Devices (Hittite). Operating DC‑4 GHz in compact SOT‑89(TO‑243AA) package, it features internal 50‑ohm I/O matching for simplified PCB design. This is an EOL obsolete part, only surplus stock available. Suitable for gain‑stage, driver and LO buffer in wireless, CATV and microwave radio systems.
Core Advantages
Broadband High‑Gain Performance
DC‑4 GHz bandwidth, up to 22 dB small‑signal gain, reduces multi‑stage amplification needs for wideband RF systems.
Excellent Linearity
+30 dBm OIP3 @850 MHz, +18 dBm P1dB @1 GHz, delivers clean signal performance for high‑density RF applications.
50‑Ohm Internally Matched
No external RF matching networks required. Only one 18Ω bias resistor plus DC‑block capacitors for operation.
Compact SMT Package
SOT‑89 / TO‑243AA surface‑mount housing, good thermal performance for general RF amplifier layouts.
Key Specifications
| Brand | Analog Devices / Hittite |
|---|---|
| RoHS Status | RoHS Compliant / Green (Lead‑Free) |
| EDA / CAD | PCB Footprint & 3D Model Available upon Request |
| Warranty | 1‑Year Standard Quality Warranty |
| Package / Case | SOT‑89-3 |
| Mounting Type | Surface Mount (SMT) |
| Surface Marking / Silkscreen | H478 Marking |
| Frequency Range | DC to 4.0 GHz |
| Small Signal Gain | 22 dB @ 1.0 GHz | 18 dB @ 2.0 GHz |
| Output IP3 (OIP3) | +30 dBm @850 MHz (Typ), +28 dBm @ 2.0‑3.0 GHz (Typ) |
| Output P1dB | +18 dBm @ 1.0 GHz |
| Noise Figure | 3 dB Typ DC‑2GHz; 4 dB Typ 2‑4GHz |
| Input Return Loss | ≥15 dB DC‑1 GHz |
| Output Return Loss | ≥13 dB DC‑3 GHz |
| Reverse Isolation | 20 dB Typical DC‑4 GHz |
| Gain Temperature Coefficient | 0.015 ~ 0.02 dB/℃ |
| Operating Current | 62 mA Typ @Vs=5V; Max 82 mA |
| Supply Voltage (Vcc) | +5 V ~ +8 V Single Supply (18Ω External Bias Resistor Required) |
| Input / Output Impedance | 50 Ω Internally Matched |
| Max RF Input Power | +5 dBm (When Vcc=4.2V) |
| ESD Rating | HBM Class 1C (≥1000V) |
| Operating Temperature Range | -40°C to +85°C |
| Storage Temperature | -65°C ~ +150°C |
| Junction Temperature Limit | 150°C |
| Thermal Resistance (Junction‑to‑Lead) | 105.6 ℃/W |
Typical Applications
- Cellular, PCS, and 3G/4G infrastructure base stations and repeaters
- Fixed Wireless Access (FWA) and Wireless Local Loop (WLL) equipment
- CATV, cable modem, and broadband fiber‑optic distribution systems
- LO buffer amplifiers and synthesizer pre‑drivers in RF transceivers
- General‑purpose test equipment, microwave radio links, and instrumentation
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, compatible replacement suggestion or bulk pricing, please use the Quick Inquiry form. We will reply within 24 hours.
Frequently Asked Questions
Q1: What are typical applications for HMC478ST89ETR?
A1: This RF gain‑block amplifier is widely used for gain‑stage, driver and LO buffer within wireless infrastructure, CATV and microwave radio systems.
Q2: Are external matching circuits required?
A2: No external RF matching needed. It features internal 50‑ohm I/O matching. One 18Ω bias resistor and DC‑block capacitors are required for normal operation.
Q3: What does suffix “ETR” mean?
A3: “E” = RoHS lead‑free version; “TR” = tape‑and‑reel packaging for automated SMT assembly. Short‑suffix variant HMC478ST89E comes in tray packaging.
Q4: Is this device still in production?
A4: No, it is EOL / obsolete since 2015. We only supply surplus stock. Contact us if you need compatible replacement suggestions.
Q5: What is its operating supply voltage?
A5: Single supply +5 V ~ +8 V, typical at +5 V. Do not power directly without the required 18Ω external bias resistor.
Q6: What is alias name for SOT‑89 package?
A6: SOT‑89 is also known as TO‑243AA. Both names refer to the identical surface‑mount footprint, pin‑to‑pin compatible.
Q7: Can you offer cross‑reference replacement options?
A7: Alternative gain‑block amplifiers exist, but gain, frequency range, linearity and package must be re‑validated on your hardware. Send your project requirements for our recommendation.
Q8: What risk for new‑design projects using this EOL part?
A8: Manufacturer has discontinued production, long‑term stock availability cannot be guaranteed. Recommended only for repair, retrofit and legacy‑equipment maintenance, not for new mass‑production designs.
Q9: Where can I get simulation model and datasheet?
A9: Datasheet and application notes can be requested via our quick inquiry form.
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