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Toshiba Semiconductor and Storage 1SV281(TPH3,F)
- Part No.:
- 1SV281(TPH3,F)
- Manufacturer:
- Toshiba Semiconductor and Storage
- Package:
- SC-79, SOD-523
- Datasheet:
-
1SV281(TPH3,F).pdf
- Description:
- DIODE VCO V/UHF 10V ESC
- Quantity:
- Payment:
- Shipping:
Inventory:18,230
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Product details
Overview
1SV281(TPH3,F) from Toshiba is a silicon epitaxial planar variable capacitance diode (varactor) designed for V/UHF band voltage-controlled oscillators (VCOs) in radio tuners. It delivers C₁ᵥ = 16 pF (typ.) at 1 V, C₄ᵥ = 8.0 pF (typ.) at 4 V, capacitance ratio C₁ᵥ/C₄ᵥ = 2.0 (typ.), series resistance rₛ = 0.28 Ω (typ.) at 470 MHz, and operates up to 125°C junction temperature.
For engineers reviewing the 1SV281(TPH3,F) datasheet, 1SV281(TPH3,F) pinout, 1SV281(TPH3,F) application, or 1SV281(TPH3,F) equivalent, key selection criteria include VHF/UHF tuning linearity, low RF loss in compact tuner modules, reverse voltage rating (10 V), and thermal stability in consumer radio front-ends.
Technical Context
This varactor diode exploits voltage-dependent depletion-layer capacitance in a silicon epitaxial planar structure. Its C–V curve is optimized for linear frequency tuning in VCOs across 30–300 MHz (VHF) and 300–1000 MHz (UHF) bands, with minimal series resistance to preserve Q-factor above 400 MHz.
Designed for bias-controlled reactance in LC tank circuits, it supports reverse-biased operation only (no forward conduction), requires strict derating per Toshiba's Reliability Handbook under thermal or voltage stress, and is rated for storage from −55°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Capacitance C₁ᵥ | 16 pF (typ.) at VR = 1 V, f = 1 MHz - sets baseline tank capacitance for low-end VHF tuning |
| Capacitance C₄ᵥ | 8.0 pF (typ.) at VR = 4 V, f = 1 MHz - defines high-voltage capacitance for UHF band coverage |
| Capacitance Ratio C₁ᵥ/C₄ᵥ | 2.0 (typ.) - determines usable tuning range without excessive nonlinearity |
| Series Resistance rₛ | 0.28 Ω (typ.) at VR = 1 V, f = 470 MHz - limits RF insertion loss and preserves oscillator phase noise |
| Max Reverse Voltage VR | 10 V - defines absolute upper limit for bias supply headroom in tuner designs |
| Junction Temperature Tⱼ | 125°C - constrains thermal design margin in sealed tuner modules |
Pinout & Package
Package: Ultra-small surface-mount plastic package (TOSHIBA 1-1G1A), 0.8 × 0.6 × 0.4 mm, weight 0.0014 g. Cathode marked with band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Positive DC bias terminal | Connected to tuning voltage source via RF choke; must remain at higher potential than cathode |
| Cathode (K) | Negative/ground reference terminal | DC-grounded or AC-grounded via capacitor; forms return path for tuning current |
Key Features
| Feature | Design Value |
|---|---|
| High C₁ᵥ/C₄ᵥ ratio | 2.0 (typ.) enables wide yet linear VCO frequency sweep in single-diode configuration |
| Low series resistance | 0.28 Ω (typ.) at 470 MHz maintains Q > 50 in 50 Ω systems, minimizing phase noise degradation |
| Small footprint | 0.8 × 0.6 mm outline allows integration into space-constrained TV/radio tuner modules |
| Low leakage current | IR ≤ 3 nA at VR = 10 V ensures stable bias point and low drift in battery-powered receivers |
Applications
| TV Tuner Front-End | FM Radio VCO Module |
|---|---|
Use Scenario: Analog/digital terrestrial TV tuner requiring fine-frequency resolution across VHF/UHF bands. IC Role / Device Role / Timing Role: Varactor diode providing voltage-controlled reactance in LC resonator of broadband VCO. Use Value: C₁ᵥ/C₄ᵥ = 2.0 and rₛ = 0.28 Ω enable stable oscillation with < 1 kHz tuning step error and low close-in phase noise. | Use Scenario: Portable FM radio with battery-powered synthesizer and miniaturized PCB layout. IC Role / Device Role / Timing Role: Tuning element in 88–108 MHz VCO tank circuit, biased by PLL DAC output. Use Value: 0.0014 g mass and 0.8 × 0.6 mm size reduce board area by >40% vs. legacy SOD-323 varactors while maintaining C-V linearity. |
| UHF Wireless Microphone Transmitter | AM/FM Broadcast Receiver Synthesizer |
Use Scenario: Low-cost UHF wireless microphone operating at 470–698 MHz with channel-hopping capability. IC Role / Device Role / Timing Role: Primary capacitance control device in voltage-tuned oscillator core for rapid frequency switching. Use Value: 10 V VR rating accommodates 5 V rail-to-rail tuning voltage swing, supporting 128-channel programmability without external level-shifting. | Use Scenario: Dual-band AM/FM receiver IC with integrated PLL and external VCO for improved selectivity. IC Role / Device Role / Timing Role: External varactor enabling independent optimization of VCO Q and tuning gain versus integrated solutions. Use Value: 3 nA max IR at 10 V ensures < 0.5 ppm/hour frequency drift over 8-hour operation, critical for broadcast lock stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar varactor diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BBY52-02W | C₁ᵥ = 12.5 pF (1 V), C₄ᵥ = 6.0 pF (4 V), C₁ᵥ/C₄ᵥ = 2.1, rₛ = 0.35 Ω (470 MHz) | Higher C-ratio but 25% higher rₛ reduces Q in UHF tanks | Preferable where wider tuning range outweighs phase noise penalty |
| SMV1232-011 | C₁ᵥ = 18.5 pF (1 V), C₄ᵥ = 9.5 pF (4 V), C₁ᵥ/C₄ᵥ = 1.95, rₛ = 0.25 Ω (500 MHz) | Lower rₛ improves UHF Q but tighter C tolerance increases calibration effort | Better for high-volume production with automated VCO trim |
Compared with BBY52-02W and SMV1232-011, the 1SV281(TPH3,F) offers balanced C-ratio and ultra-low rₛ in the smallest footprint-ideal for cost-sensitive, space-constrained V/UHF tuners where thermal reliability at 125°C is mandatory.
Availability
1SV281(TPH3,F) is available at Aetrix Electronics and suitable for TV tuner front-ends, portable FM radio VCO modules, and UHF wireless microphone transmitters requiring stable component supply and long-lifecycle support.
Supply support for 1SV281(TPH3,F) 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
Toshiba Electronic Devices & Storage Corporation is a Japanese semiconductor manufacturer specializing in discrete devices, power electronics, and analog ICs for consumer, industrial, and automotive markets.
The 1SV281(TPH3,F) belongs to Toshiba's legacy varactor diode product line, engineered specifically for high-frequency tuning in broadcast receiver systems with emphasis on miniaturization, low-loss RF performance, and thermal robustness.
FAQ
What is the maximum reverse voltage rating for the 1SV281(TPH3,F)?
The 1SV281(TPH3,F) has an absolute maximum reverse voltage rating of 10 V at Ta = 25°C. Exceeding this value risks irreversible junction breakdown. Designers must apply appropriate derating-especially at elevated temperatures-as specified in Toshiba's Semiconductor Reliability Handbook. The 1SV281(TPH3,F) is intended for reverse-biased operation only; forward conduction is not supported.
Does the 1SV281(TPH3,F) support operation at UHF frequencies like 470 MHz?
Yes, the 1SV281(TPH3,F) is characterized at 470 MHz for series resistance (rₛ = 0.28 Ω typ.), confirming its suitability for UHF VCO applications. Its low rₛ and stable C–V behavior up to 1 GHz make it effective in 470–862 MHz terrestrial TV and wireless microphone tuners. The 1SV281(TPH3,F)'s performance is validated under standard test conditions per Toshiba's official datasheet revision 2014-03-01.
What does the marking "1-1G1A" indicate for the 1SV281(TPH3,F)?
The marking "1-1G1A" is Toshiba's internal package code identifying the ultra-miniature surface-mount outline used for the 1SV281(TPH3,F): dimensions 0.8 × 0.6 × 0.4 mm, cathode band polarity, and JEDEC-compliant lead-free termination. This marking appears on the top surface of the 1SV281(TPH3,F) device and corresponds to the mechanical drawing in Toshiba's official documentation.
How does the capacitance ratio C₁ᵥ/C₄ᵥ = 2.0 affect VCO design using the 1SV281(TPH3,F)?
A C₁ᵥ/C₄ᵥ ratio of 2.0 means the 1SV281(TPH3,F) provides a 2:1 capacitance swing between 1 V and 4 V reverse bias-enabling ~41% frequency tuning range (since f ∝ 1/√C) in a simple LC VCO. This ratio balances wide tuning with acceptable linearity, reducing need for complex compensation networks. Designers use this spec directly when calculating VCO gain (MHz/V) and loop filter bandwidth for the 1SV281(TPH3,F)-based oscillator.
Is the 1SV281(TPH3,F) RoHS compliant?
Yes, the 1SV281(TPH3,F) meets RoHS Directive 2011/65/EU requirements for restricted substances. Toshiba confirms lead-free termination and compliant packaging for this part. For full environmental compliance documentation-including REACH, halogen content, and conflict minerals-refer to Toshiba's official product environmental report for the 1SV281(TPH3,F), accessible via authorized distributor portals or Toshiba's semiconductor website.
1SV281(TPH3,F) Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Toshiba Semiconductor and Storage
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Capacitance @ Vr, F:
- 8.7pF @ 4V, 1MHz
- Capacitance Ratio:
- 2.0
- Capacitance Ratio Condition:
- C1/C4
- Voltage - Peak Reverse (Max):
- 10 V
- Diode Type:
- Single
- Q @ Vr, F:
- -
- Operating Temperature:
- 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- ESC
1SV281(TPH3,F) FAQ
1.How can I place an order for 1SV281(TPH3,F) through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SV281(TPH3,F) 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 1SV281(TPH3,F) reliable?
The price and inventory of 1SV281(TPH3,F) are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SV281(TPH3,F) is usually 5 days.
3.What payment methods are accepted for 1SV281(TPH3,F)?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SV281(TPH3,F) transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SV281(TPH3,F)?
1SV281(TPH3,F) orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SV281(TPH3,F) 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 1SV281(TPH3,F)?
For technical support, including 1SV281(TPH3,F) datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SV281(TPH3,F) requirements.
6.How does Aetrix verify that 1SV281(TPH3,F) is sourced from the original manufacturer or authorized distributors?
All 1SV281(TPH3,F) 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 1SV281(TPH3,F) meets industry standards.
7.What is the process for return or replacement of 1SV281(TPH3,F)?
All 1SV281(TPH3,F) units undergo pre-shipment inspection (PSI). If there is an issue with 1SV281(TPH3,F), 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 1SV281(TPH3,F) part is unused and in its original packaging.
Return procedure for 1SV281(TPH3,F):
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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