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Home > Products > RF and Wireless > RF Amplifiers

STMicroelectronics TSH690IDT

Name: TSH690IDT
Brand: STMicroelectronics
SKU: TSH690IDT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TSH690IDT

Manufacturer:: STMicroelectronics

Category:: RF Amplifiers

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: TSH690IDT.pdf

Description:: IC AMP CELLULAR 40MHZ-1GHZ 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:1,460

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Product details

Overview

TSH690IDT from STMicroelectronics is a 40 MHz–1 GHz two-stage RF amplifier in SO-8 package, featuring 28 dB gain at 450 MHz, +13.5 dBm (20 mW) output power at 3 V, and bias-adjustable amplification class (A/AB/power-down). It serves as an output-stage driver in ISM-band transmitters and SAW-based ASK remote control systems.

For engineers reviewing the TSH690IDT datasheet, TSH690IDT pinout, TSH690IDT application, or TSH690IDT equivalent, key selection criteria include adjustable bias current (pin 8), 50 Ω input/output matching, thermal dissipation limits (R_th(j-a) = 180 °C/W), and harmonic suppression capability in ASK modulation schemes.

Technical Context

The TSH690IDT employs a dual-transistor bipolar architecture with open-collector output stage requiring external inductive load (e.g., L2 = 56 nH at 450 MHz) for impedance matching and optimal power delivery. Its internal 50 Ω matching covers 300–1000 MHz.

Bias control via pin 8 enables continuous adjustment of quiescent current (0–105 mA), shifting operation from Class A (V_bias = V_CC) to Class AB (reduced V_bias) to full power-down (V_bias = 0 V), directly governing gain, output power, and harmonic content.

Key Specifications

Parameter	Value and Actual Design Meaning
Frequency Range	40 MHz to 1000 MHz - supports ISM bands at 433 MHz and 868 MHz without external tuning networks.
Small-Signal Gain	28 dB at 450 MHz - enables single-stage amplification in low-power transmitter output stages.
Output Power (P1dB)	+13.5 dBm at 450 MHz / +14.3 dBm at 900 MHz - delivers >20 mW into 50 Ω load with 3 V supply.
Input/Output Matching	50 Ω internally matched (300–1000 MHz) - eliminates need for external input matching; output requires L2 inductor for return loss optimization.
Bias Control Range	V_bias = 0 to 5 V - sets operating class, enabling dynamic trade-off between linearity (Class A), efficiency (Class AB), and zero-current standby.
Supply Voltage	1.5 V to 5 V - compatible with Li-ion, 3.3 V, and 5 V system rails; R1 resistor recommended above 4 V to limit thermal dissipation.
Thermal Resistance	R_th(j-a) = 180 °C/W (SO-8) - defines safe ambient temperature ceiling (e.g., ≤70 °C at 3 V, 50 mA continuous).

Pinout & Package

Package: SO-8 plastic micropackage (8-pin small outline), 4.8–5.0 mm × 5.8–6.2 mm body, 1.27 mm pitch, R_th(j-a) = 180 °C/W.

Pin/Terminal	Circuit Role	Design Meaning
1 (V_CC1)	Supply voltage for first transistor stage	Must be decoupled with 1 nF capacitor; connects to oscillator section.
2 (RF IN)	RF input terminal	50 Ω matched; requires DC blocking capacitor (1 nF typical below 100 MHz).
3 (GND)	Ground reference	Low-inductance connection essential; multiple vias recommended for RF stability.
4 (V_CC2)	Supply voltage for second (output) stage	Connected to L2 inductor; decoupling with 10 µF + 1 nF + 100 pF required.
5 (OSC OUT)	Oscillator output (Colpitts collector)	Internally connected to integrated inductor L1; interfaces with SAW resonator.
6 (GND)	Ground reference	Dedicated ground pin for oscillator section; separate from power ground if possible.
7 (OSC IN)	Oscillator input (Colpitts emitter)	Connects to SAW resonator and C1/C2; biased via RF choke (56 nH) and R1.
8 (V_bias)	Bias control voltage input	Directly sets quiescent current and amplification class; 0 V = power-down, V_CC = Class A.

Key Features

Feature	Design Value
Adjustable amplification class	V_bias pin enables seamless transition from linear Class A (max SNR) to efficient Class AB (lower I_CC) to zero-consumption power-down mode.
Integrated 50 Ω matching	Validated S-parameters confirm S11 < −10 dB and S22 < −4.5 dB across 300–1000 MHz - reduces external component count in compact ISM designs.
Harmonic suppression ready	With optimized L2/C3 network (e.g., 10 nH + 13 pF parallel tank), 2nd/3rd harmonics reach −27 dBc / −34 dBc - meets ETSI EN 300 220 spectral mask requirements.
Fast ASK modulation support	Turn-on time ≈ 200 µs enables 2400 b/s OOK data rate with 25% duty cycle; digital logic-level bias control eliminates need for modulator IC.
Thermally robust SO-8 layout	Exposed pad not present, but 180 °C/W R_th(j-a) allows 50 mA continuous operation at ≤70 °C ambient - validated in telemetering PCB layouts.

Applications

433 MHz ISM Transmitter

868 MHz Telemetering System

Use Scenario: Battery-powered wireless sensor node transmitting temperature/humidity data over 100 m in industrial warehouse.

IC Role / Device Role / Timing Role: Final-stage RF amplifier driving quarter-wave monopole antenna; replaces discrete transistor pair with integrated bias control.

Use Value: Delivers +13.5 dBm at 450 MHz with <50 mA I_CC, enabling 10-year coin-cell life when paired with 1% duty-cycle wake-up protocol.

Use Scenario: Utility meter reading system using sub-GHz mesh network in dense urban environment.

IC Role / Device Role / Timing Role: Output driver in multi-channel TDMA transmitter; synchronized to base station timing via external clock.

Use Value: 21 dB gain at 900 MHz and −35 dB reverse isolation (S12) prevent inter-channel crosstalk in frequency-hopping sequences.

SAW-Based Remote Control

ASK Cordless Telephone Base

Use Scenario: Automotive keyless entry fob with push-button activation and encrypted rolling code.

IC Role / Device Role / Timing Role: Integrated oscillator + PA core; SAW resonator on pins 5/7 generates carrier; pin 8 accepts OOK modulation signal.

Use Value: Eliminates separate VCO and PA ICs; 200 µs turn-on time supports secure 2.4 kbps challenge-response handshake.

Use Scenario: DECT 1.88 GHz base station auxiliary transmitter for range extension and channel diversity.

IC Role / Device Role / Timing Role: Low-cost wideband driver stage preceding final GaAs PA; handles 1.8–1.9 GHz band with external matching.

Use Value: 28 dB gain at 450 MHz extrapolates to usable 15–18 dB gain up to 1.9 GHz with L2/C3 retuning - cuts BOM cost vs. narrowband alternatives.

Equivalent & Alternatives

The following parts are listed as comparable options for similar RF amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX2641EUT+T	Fixed-gain (20 dB), no bias control pin; requires external matching at all frequencies; 50 Ω input only.	Lacks Class A/AB/power-down flexibility; unsuitable for ASK modulation or duty-cycled telemetry.	Select when fixed gain and minimal external components outweigh need for dynamic bias control.
QPL9057TR13	Higher gain (31 dB @ 900 MHz), integrated active bias, 1.8–3.6 V supply only; no power-down mode.	Optimized for LTE/5G front-end; lacks V_bias-driven modulation path and 433 MHz performance validation.	Select for high-efficiency 868/915 MHz IoT nodes where continuous transmission dominates.

Compared with MAX2641EUT+T and QPL9057TR13, the TSH690IDT uniquely combines bias-controlled amplification class, validated 433/868 MHz ISM performance, and integrated oscillator interface - making it irreplaceable in cost-sensitive, modulation-aware SAW transmitter designs.

Availability

TSH690IDT is available at Aetrix Electronics and suitable for 433 MHz ISM transmitters, 868 MHz telemetering systems, and SAW-based remote controls requiring stable component supply across extended temperature ranges (−40 °C to +85 °C).

Supply support for TSH690IDT 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, MCU, power, and RF solutions for industrial, automotive, and consumer markets.

The TSH690IDT belongs to ST's legacy RF amplifier product line, engineered specifically for low-cost, high-reliability sub-GHz ISM-band transmitters where integration, bias flexibility, and thermal predictability are critical.

FAQ

What is the maximum recommended supply voltage for continuous operation?

The absolute maximum supply voltage is 5.5 V, but continuous operation above 4 V requires a series resistor (R1) between V_CC and V_bias to limit junction temperature. At 5 V and 105 mA, power dissipation exceeds 500 mW - exceeding the SO-8 package's safe operating area unless ambient is ≤40 °C with forced airflow.

Can the TSH690IDT be used without an external inductor on the output?

No. The output stage is an open-collector configuration requiring an external inductive load (L2) for DC biasing and impedance transformation. Without L2, the device cannot deliver rated output power or maintain 50 Ω matching - S22 degrades to >−2 dB, causing severe mismatch loss and potential instability.

How does the V_bias pin affect harmonic distortion in ASK mode?

Lowering V_bias shifts operation toward Class AB, increasing 2nd/3rd harmonic content (e.g., from −27 dBc to −18 dBc at 450 MHz). For clean OOK, V_bias should be set ≥2.5 V to maintain Class A-like linearity while retaining fast turn-on; R2 series resistor on pin 8 further filters modulation harmonics.

Is the TSH690IDT suitable for 2.4 GHz applications?

No. Its specified frequency range is 40–1000 MHz, with verified performance only up to 1 GHz. S21 drops to <10 dB at 1.5 GHz and becomes negative beyond 2 GHz. For 2.4 GHz, ST recommends the TQM7M9006 or equivalent GaAs MMIC amplifiers with validated 2.4–2.5 GHz S-parameter data.

TSH690IDT Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Frequency:: 40MHz ~ 1GHz

P1dB:: 14.3dBm

Gain:: 30dB

Noise Figure:: 5.4dB

RF Type:: Cellular, GSM, TDMA

Voltage - Supply:: 1.5V ~ 5V

Current - Supply:: 105mA

Test Frequency:: 900MHz

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

TSH690IDT FAQ

1.How can I place an order for TSH690IDT through Aetrix?

Please submit a Request for Quotation (RFQ) for TSH690IDT 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 TSH690IDT reliable?

The price and inventory of TSH690IDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSH690IDT is usually 5 days.

3.What payment methods are accepted for TSH690IDT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSH690IDT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TSH690IDT?

TSH690IDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TSH690IDT 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 TSH690IDT?

For technical support, including TSH690IDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSH690IDT requirements.

6.How does Aetrix verify that TSH690IDT is sourced from the original manufacturer or authorized distributors?

All TSH690IDT 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 TSH690IDT meets industry standards.

7.What is the process for return or replacement of TSH690IDT?

All TSH690IDT units undergo pre-shipment inspection (PSI). If there is an issue with TSH690IDT, 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 TSH690IDT part is unused and in its original packaging.

Return procedure for TSH690IDT:

1.Submit a request within 90 days.

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

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