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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Management - Specialized

Texas Instruments AFE20408RHBT

Name: AFE20408RHBT
Brand: Texas Instruments
SKU: AFE20408RHBT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AFE20408RHBT

Manufacturer:: Texas Instruments

Category:: Power Management - Specialized

Package:: 32-VFQFN Exposed Pad

Datasheet:: AFE20408RHBT.pdf

Description:: EIGHT-CHANNEL POWER-AMPLIFIER MO

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AFE20408RHBT from Texas Instruments is an 8-channel power-amplifier monitor and controller IC featuring eight 13-bit monotonic DACs (1.22 mV resolution), dual high-voltage ADC inputs (0 V to 85 V), two high-side current-sense amplifiers (85 V common-mode range), and on-chip temperature sensing (±2.5 °C accuracy). It provides programmable output sequencing, fast gate-bias switch control (400 ns t_ON/t_OFF), and operates across –40 °C to +125 °C for radar front-end biasing of GaN/GaAs PAs.

For engineers reviewing the AFE20408RHBT datasheet, AFE20408RHBT pinout, AFE20408RHBT application, or AFE20408RHBT equivalent, key selection criteria include its dual-range DAC capability (–10 V to 0 V / 0 V to 10 V), integrated high-voltage monitoring, SPI/I²C dual-interface support (1.65 V to 3.6 V IO), and 32-pin VQFN package with thermal pad for high-power amplifier bias control in demanding RF systems.

Technical Context

The AFE20408RHBT integrates two functionally distinct subsystems: an 8-channel DAC-based gate-bias controller with dedicated ON/OFF switches per channel and a multichannel supervisory ADC with high-voltage analog inputs and current-sense amplifiers. Its architecture supports mixed-range operation-Group A DACs configured for negative output (VSSA = –11 V) while Group B operates positive (VCCB = 11 V)-enabling simultaneous biasing of depletion-mode and enhancement-mode transistors.

Sequencing logic governs startup/shutdown timing across all eight DAC outputs using DRVEN0/DRVEN1 control pins and PAON synchronization signal. The device uses an internal 2.5 V reference and supports both SPI (up to 25 MHz, FSDO=1) and I²C (up to 400 kHz) interfaces with configurable target addresses and flexible data framing, enabling integration into heterogeneous RF subsystems requiring deterministic bias timing and fault-aware supervision.

Key Specifications

Parameter	Value and Actual Design Meaning
DAC resolution	13-bit monotonic, delivering 1.22 mV step size over ±10 V range-enables precise gate voltage tuning for GaN HEMT threshold control.
High-voltage ADC input	Two 0 V to 85 V inputs (ADCHV0/ADCHV1)-directly monitors drain supply rails without external level-shifting or attenuation networks.
Current-sense CM range	–0.3 V to 85 V common-mode-supports high-side sensing on GaN PA drain lines operating near 48 V or 28 V supplies.
Temperature accuracy	±2.5 °C over –40 °C to +125 °C-provides reliable thermal derating for PA bias stability in wide-temperature military/aerospace environments.
Switch response time	400 ns t_ON/t_OFF (DRVEN-triggered)-ensures sub-microsecond enable/disable of gate bias paths during fast PA ramp-up/ramp-down sequences.
Digital interface	SPI (25 MHz max, FSDO=1) and I²C (400 kHz) with 1.65 V–3.6 V VIO-compatible with low-voltage FPGA/CPLD controllers and legacy microcontrollers.
Operating temperature	Specified –40 °C to +125 °C junction; functional up to +150 °C-validated for under-hood radar modules and EW pod electronics.

Pinout & Package

The AFE20408RHBT is housed in a 5 mm × 5 mm RHB (VQFN-32) package with exposed thermal pad, optimized for high-power RF applications requiring efficient heat dissipation through PCB ground plane connection via multiple vias.

Pin/Terminal	Circuit Role	Design Meaning
VCCA / VCCB	Group A/B positive analog supply	Set DAC output polarity: VCCA = GND enables –10 V to 0 V range; VCCB = 11 V enables 0 V to 10 V range-supports mixed-mode biasing.
VSSA / VSSB	Group A/B negative analog supply	VSSA = –11 V configures Group A for negative output; VSSB = GND configures Group B for positive output-enables independent rail control.
DACA0–DACA3 / DACB0–DACB3	DAC buffer outputs	High-current, high-capacitive-load-tolerant buffered DAC outputs-drive gate capacitance directly without external op-amps.
OUTA0/OUTA2/OUTB0/OUTB2	Switched gate-bias outputs	Low-R_DS(on) (3–5 Ω) switched paths controlled by DRVEN0/DRVEN1-provide fast, isolated bias delivery during sequencing events.
SENSE0± / SENSE1±	High-side current-sense inputs	85 V common-mode capable differential inputs-measure shunt voltage across high-side current sense resistors in PA drain path.
ADCHV0 / ADCHV1	High-voltage ADC inputs	0 V to 85 V single-ended inputs-monitor PA drain voltage or auxiliary supply rails without external dividers or isolation.
PAON	Power amplifier sync output	Open-drain synchronization signal indicating valid bias state-used to gate RF enable signals in phased-array transmit chains.
DRVEN0 / DRVEN1	Asynchronous switch enable inputs	Direct TTL/CMOS-controlled gate-bias switching-bypasses internal sequencer for manual override during test or fault recovery.

Key Features

Feature	Design Value
Auto-ranging DAC output configuration	Hardware-determined output polarity (–10 V to 0 V or 0 V to 10 V) at power-up-eliminates software calibration overhead for mixed-technology PA biasing.
Integrated sequencing engine	Programmable start-up/shutdown order across all 8 DAC channels using internal timer and DRVEN-triggered events-ensures safe turn-on/off of cascaded GaN MMIC stages.
High-voltage supervision with alarm detection	Configurable thresholds on VCC/VSS supplies and ADC inputs-triggers ALARMIN/ALARMOUT signaling for autonomous PA protection without host intervention.
Flexible digital interface mode selection	Single-pin configuration (FSDO bit) selects SPI data output edge-allows interoperability with both rising- and falling-edge-clocked masters without hardware changes.
Thermal-aware operation	On-die temperature sensor with ±2.5 °C accuracy and 7.8125 m°C resolution-enables closed-loop bias adjustment based on real-time junction temperature feedback.

Applications

Radar Transmit Module	Electronic Warfare Jammer
Use Scenario: Biasing multi-stage GaN power amplifiers in X-band active electronically scanned array (AESA) radar transceivers. IC Role / Device Role / Timing Role: Simultaneous 8-channel gate voltage control with synchronized PAON strobe and high-voltage drain monitoring. Use Value: Enables deterministic turn-on sequence preventing latch-up in cascaded MMICs, while 85 V ADC inputs eliminate external voltage dividers on 48 V drain rails.	Use Scenario: Managing bias states across broadband solid-state jammers operating across L/S/C bands with rapid frequency hopping. IC Role / Device Role / Timing Role: Fast-switching DAC outputs (400 ns) and DRVEN-controlled gate bias enable millisecond-level PA reconfiguration during jamming waveform transitions. Use Value: Reduces intermodulation distortion during band-switching by eliminating bias voltage glitches through precise sequencing and low-noise DAC outputs (70 µVpp).
Software Defined Radio Front End	Seeker Guidance System
Use Scenario: Dynamic bias control of reconfigurable PA arrays in multi-standard SDR platforms supporting LTE, 5G NR, and Wi-Fi 6E. IC Role / Device Role / Timing Role: Dual-interface (SPI/I²C) support allows integration with ARM-based baseband processors and FPGA-based RF resource managers. Use Value: Mixed-range DAC capability permits concurrent biasing of LDMOS (positive V_GS) and GaN (negative V_GS) PAs within same RF chain-reducing bill-of-materials count.	Use Scenario: Closed-loop thermal management of millimeter-wave seeker PAs operating in high-G, wide-temperature missile environments. IC Role / Device Role / Timing Role: On-chip temperature sensor (±2.5 °C) feeds real-time junction data to host MCU for adaptive bias compensation during flight. Use Value: Maintains PA linearity and gain stability across –55 °C to +150 °C operational range-critical for terminal guidance accuracy under extreme aerodynamic heating.

Radar Transmit Module

Electronic Warfare Jammer

Use Scenario: Biasing multi-stage GaN power amplifiers in X-band active electronically scanned array (AESA) radar transceivers.

IC Role / Device Role / Timing Role: Simultaneous 8-channel gate voltage control with synchronized PAON strobe and high-voltage drain monitoring.

Use Value: Enables deterministic turn-on sequence preventing latch-up in cascaded MMICs, while 85 V ADC inputs eliminate external voltage dividers on 48 V drain rails.

Use Scenario: Managing bias states across broadband solid-state jammers operating across L/S/C bands with rapid frequency hopping.

IC Role / Device Role / Timing Role: Fast-switching DAC outputs (400 ns) and DRVEN-controlled gate bias enable millisecond-level PA reconfiguration during jamming waveform transitions.

Use Value: Reduces intermodulation distortion during band-switching by eliminating bias voltage glitches through precise sequencing and low-noise DAC outputs (70 µVpp).

Software Defined Radio Front End

Seeker Guidance System

Use Scenario: Dynamic bias control of reconfigurable PA arrays in multi-standard SDR platforms supporting LTE, 5G NR, and Wi-Fi 6E.

IC Role / Device Role / Timing Role: Dual-interface (SPI/I²C) support allows integration with ARM-based baseband processors and FPGA-based RF resource managers.

Use Value: Mixed-range DAC capability permits concurrent biasing of LDMOS (positive V_GS) and GaN (negative V_GS) PAs within same RF chain-reducing bill-of-materials count.

Use Scenario: Closed-loop thermal management of millimeter-wave seeker PAs operating in high-G, wide-temperature missile environments.

IC Role / Device Role / Timing Role: On-chip temperature sensor (±2.5 °C) feeds real-time junction data to host MCU for adaptive bias compensation during flight.

Use Value: Maintains PA linearity and gain stability across –55 °C to +150 °C operational range-critical for terminal guidance accuracy under extreme aerodynamic heating.

Equivalent & Alternatives

The following parts are listed as comparable options for similar power-amplifier monitor and controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AFE20404RHBT	4-channel version with identical DAC/ADC specs, same 32-pin VQFN package, and shared register map-but lacks Group B DACs and associated OUTBx/DRVEN1 pins.	Suitable only for single-path or lower-complexity PA chains; cannot support dual-branch or push-pull GaN configurations requiring 8 independent bias controls.	Select when system requires ≤4 bias channels and board space or cost optimization is prioritized over channel count scalability.
LM9779AIPMTR	4-channel analog front-end with 12-bit DACs (lower resolution), no high-voltage ADC inputs (max 5 V), and no integrated current-sense amplifiers-requires external signal conditioning.	Limited to low-voltage, non-ruggedized applications; unsuitable for direct 85 V drain monitoring or GaN high-side current sensing without added components.	Choose only for cost-sensitive commercial SDR designs where 85 V monitoring and GaN biasing are not required.

Compared with AFE20404RHBT and LM9779AIPMTR, the AFE20408RHBT uniquely delivers full 8-channel bias control with native 85 V monitoring, integrated current sensing, and mixed-range DAC operation-making it the only option qualified for high-reliability radar and EW systems requiring simultaneous multi-technology PA supervision.

Availability

AFE20408RHBT is available at Aetrix Electronics and suitable for radar transmit modules, electronic warfare jammers, and seeker guidance systems requiring stable component supply across extended temperature and high-voltage operating conditions.

Supply support for AFE20408RHBT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with deep expertise in high-performance signal chain and power management solutions.

The AFE20408RHBT belongs to TI's high-voltage analog front-end product line, designed specifically for ruggedized RF power amplifier biasing and supervision in defense, aerospace, and communications infrastructure applications.

FAQ

What is the maximum capacitive load the AFE20408RHBT DAC outputs can drive without instability?

The AFE20408RHBT DAC outputs maintain stability with up to 15 µF capacitive load, as verified by characterization across –40 °C to +125 °C. This enables direct driving of large gate capacitances in GaN MMICs without external isolation resistors or buffer amplifiers-reducing component count and layout complexity in compact radar modules where the AFE20408RHBT is deployed.

Does the AFE20408RHBT support simultaneous positive and negative DAC output ranges?

Yes-the AFE20408RHBT supports mixed-range operation: Group A DACs (DACA0–DACA3) can be configured for –10 V to 0 V output (VSSA = –11 V, VCCA = GND), while Group B DACs (DACB0–DACB3) operate 0 V to 10 V (VCCB = 11 V, VSSB = GND). This capability is essential for biasing hybrid PA stages containing both depletion-mode GaN and enhancement-mode LDMOS devices within the same AFE20408RHBT-controlled system.

How does the AFE20408RHBT handle overvoltage conditions on its high-voltage ADC inputs?

The AFE20408RHBT ADCHV0 and ADCHV1 inputs tolerate up to 85 V continuously and feature internal clamping diodes. Absolute maximum rating allows transient excursions beyond 85 V, but sustained >85 V may degrade clamp diodes over ≥5 years. For robust field operation, the AFE20408RHBT is typically used with external TVS protection in radar front ends where lightning-induced surges or switching transients occur-ensuring long-term reliability of the AFE20408RHBT in mission-critical systems.

Can the AFE20408RHBT's PAON output be used to synchronize external RF switches?

Yes-the PAON pin is an open-drain output that asserts low during valid bias conditions and releases high-Z otherwise, providing a hardware-level ready signal. In radar systems using the AFE20408RHBT, PAON is commonly wired to enable pins of T/R switches or limiter drivers, ensuring RF signal paths activate only after stable gate bias is established-preventing damage to sensitive LNAs or antenna elements during PA ramp-up.

What is the temperature accuracy specification of the AFE20408RHBT's on-die sensor over its full operating range?

The AFE20408RHBT's integrated temperature sensor achieves ±2.5 °C accuracy across the specified junction temperature range of –40 °C to +125 °C, with 7.8125 m°C resolution. This performance is validated by TI characterization data and enables precise thermal derating of PA bias points in airborne radar systems where the AFE20408RHBT operates under extreme ambient and self-heating conditions-maintaining output power consistency across flight envelopes.

AFE20408RHBT Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 32-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Applications:: Current/Power Monitor

Current - Supply:: 15mA (Max)

Voltage - Supply:: 1.65V ~ 3.6V, 3V ~ 5.5V

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 32-VQFN (5x5)

AFE20408RHBT FAQ

1.How can I place an order for AFE20408RHBT through Aetrix?

Please submit a Request for Quotation (RFQ) for AFE20408RHBT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AFE20408RHBT reliable?

The price and inventory of AFE20408RHBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AFE20408RHBT is usually 5 days.

3.What payment methods are accepted for AFE20408RHBT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AFE20408RHBT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AFE20408RHBT?

AFE20408RHBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AFE20408RHBT order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AFE20408RHBT?

For technical support, including AFE20408RHBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AFE20408RHBT requirements.

6.How does Aetrix verify that AFE20408RHBT is sourced from the original manufacturer or authorized distributors?

All AFE20408RHBT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AFE20408RHBT meets industry standards.

7.What is the process for return or replacement of AFE20408RHBT?

All AFE20408RHBT units undergo pre-shipment inspection (PSI). If there is an issue with AFE20408RHBT, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AFE20408RHBT part is unused and in its original packaging.

Return procedure for AFE20408RHBT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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