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Vishay Siliconix SIP21107DT-285-E3
- Part No.:
- SIP21107DT-285-E3
- Manufacturer:
- Vishay Siliconix
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
SIP21107DT-285-E3.pdf
- Description:
- IC REG LIN 2.85V 150MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,364
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Product details
Overview
SIP21107DT-285-E3 from Vishay Siliconix is a 2.85 V fixed-output, 150 mA low-noise low-dropout (LDO) regulator with Power OK (POK) error flag and no external noise bypass capacitor required. It features 135 mV dropout at 150 mA, 1.0 % output voltage accuracy at 25 °C, and operates across -40 °C to +85 °C ambient temperature. It serves as a stable, quiet power source for RF sections in portable wireless handsets.
For engineers reviewing the SIP21107DT-285-E3 datasheet, SIP21107DT-285-E3 pinout, SIP21107DT-285-E3 application, or SIP21107DT-285-E3 equivalent, key selection criteria include POK functionality, ultra-low ground current (35 µA typ. at 1 mA), shutdown current <1 µA, auto-discharge capability, and compatibility with 1 µF ceramic output capacitors.
Technical Context
The SIP21107DT-285-E3 uses an internal P-channel MOSFET pass transistor (0.9 Ω typical RDS(on)) enabling low dropout and near-zero gate drive current. Its error amplifier compares a 1.2 V bandgap reference against feedback from the regulated output, driving the pass device to maintain 2.85 V within ±1.0 % at 25 °C.
It integrates a dedicated open-drain POK comparator monitoring VOUT against 90–96 % of VIN, with 1.5 % hysteresis and 40 µs delay. Shutdown mode activates an internal 100 Ω NMOS discharge path, pulling VOUT to ground in <1 ms for 1 µF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.85 V ±1.0 % at 25 °C; ensures precise biasing for 2.85 V logic or RF ICs without external resistors. |
| Dropout Voltage | 135 mV at 150 mA load; enables regulation down to VIN = 2.985 V, extending battery runtime in single-cell Li-ion systems. |
| Ground Current | 35 µA typical at 1 mA load; minimizes quiescent drain during light-load standby in always-on subsystems. |
| Shutdown Current | ≤1 µA maximum at 85 °C; preserves battery charge during deep sleep modes in portable devices. |
| POK Threshold | 90–96 % of VIN (rising edge); provides reliable power-good assertion before downstream circuitry powers up. |
| Auto-Discharge | 100 Ω internal NMOS pull-down; discharges 1 µF output cap to <100 mV in <1 ms upon EN deassertion. |
| Thermal Protection | 160 °C junction shutdown with 20 °C hysteresis; prevents permanent damage during sustained overload or poor PCB thermal design. |
Pinout & Package
Package: TSOT23-5L (3.05 mm × 2.85 mm × 1.0 mm), RoHS-compliant, industrial temperature range (-40 °C to +85 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable control input | Active-high logic: ≥1.2 V enables regulation; ≤0.4 V disables output and activates auto-discharge. |
| 2 - GND | Power ground reference | Primary thermal and electrical return; must connect to large copper plane for thermal dissipation and noise immunity. |
| 3 - VIN | Input supply connection | Accepts 2.2–6.0 V input; requires 1 µF ceramic bypass capacitor close to pin for stability and line transient rejection. |
| 4 - VOUT | Regulated output | Delivers 2.85 V at up to 150 mA; stable with ≥1 µF ceramic output capacitor; supports fast load transients via active pull-down. |
| 5 - POK | Open-drain Power OK flag | Drives low when VOUT falls below threshold; requires external pull-up to VIN or VOUT; signals system controller of valid supply. |
Key Features
| Feature | Design Value |
|---|---|
| No external noise bypass capacitor required | Eliminates 10 nF BP capacitor needed by SiP21106, simplifying BOM and layout while maintaining low-noise operation. |
| Integrated POK (Power OK) error flag | Provides system-level power sequencing and fault detection without external comparators or voltage dividers. |
| Auto-discharge on shutdown | Internally pulls VOUT to GND via 100 Ω NMOS, preventing floating outputs and ensuring clean reset behavior. |
| Stable with 1 µF ceramic output capacitor | Reduces board area and cost versus tantalum or larger ceramics; supports high-frequency load transients. |
| Short-circuit and thermal protection | 330 mA typical current limit and 160 °C thermal shutdown prevent damage during faults or thermal overload. |
Applications
| Cellular Handset RF Section | Wireless Modem Baseband |
|---|---|
Use Scenario: Powering low-noise amplifiers (LNAs) and mixer stages in GSM/UMTS/WCDMA front-end modules. IC Role / Device Role / Timing Role: Ultra-low-noise 2.85 V bias supply with POK confirmation prior to RF activation. Use Value: 350 µV(rms) output noise (10 Hz–100 kHz) avoids degradation of receiver sensitivity and adjacent channel rejection. | Use Scenario: Supplying baseband processor I/O banks requiring tightly regulated 2.85 V with fast turn-on and fault reporting. IC Role / Device Role / Timing Role: Primary LDO with POK signaling readiness to the modem's power management unit (PMU). Use Value: 70 µs VOUT turn-on time and POK delay <40 µs enable deterministic power sequencing in multi-rail modems. |
| Digital Camera Image Sensor Bias | PDA Application Processor Core |
Use Scenario: Providing clean analog supply to CMOS image sensor analog front-end (AFE) circuits. IC Role / Device Role / Timing Role: Low-noise, low-dropout regulator with auto-discharge to prevent sensor latch-up during power cycling. Use Value: 135 mV dropout allows operation from partially discharged batteries; 100 Ω discharge path clears residual charge before next frame capture. | Use Scenario: Supplying core voltage to ARM-based application processors during dynamic frequency scaling. IC Role / Device Role / Timing Role: Secondary LDO delivering 2.85 V to processor I/O or memory interface, controlled via EN pin. Use Value: 35 µA ground current at 1 mA load minimizes idle power; POK enables safe clock gating until supply stabilizes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-285I/TT | 300 mA output, 600 mV dropout at full load, no POK pin, 1.8 µA quiescent current | Lacks POK flag and auto-discharge; suited for non-sequenced, low-IQ applications | Select when POK signaling is unnecessary and lower quiescent current outweighs missing fault reporting. |
| TLC7701QDCKR | Adjustable output, integrated reset timer, 200 mA output, 350 mV dropout, no auto-discharge | Requires external resistors for 2.85 V; includes reset timeout but no POK status pin | Choose when system-level reset timing is critical and output adjustability justifies added components. |
Compared with MCP1700T-285I/TT and TLC7701QDCKR, the SIP21107DT-285-E3 uniquely combines POK flag, auto-discharge, and 135 mV dropout in a 5-pin TSOT23 package-enabling compact, sequenced, and fail-safe power delivery where supply integrity verification is mandatory.
Availability
SIP21107DT-285-E3 is available at Aetrix Electronics and suitable for cellular handsets, wireless modems, and digital cameras requiring stable component supply despite its End-of-Life status per Vishay's last purchase date of 31-Dec-2014.
Supply support for SIP21107DT-285-E3 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
Vishay Siliconix designs and manufactures high-performance discrete semiconductors and integrated power solutions, emphasizing reliability, efficiency, and miniaturization for demanding electronic systems.
The SiP21107 series was developed specifically for battery-powered portable electronics needing low-noise, low-quiescent-current LDOs with integrated power-good signaling and fast transient response.
FAQ
What is the POK (Power OK) function of the SIP21107DT-285-E3?
The SIP21107DT-285-E3 POK pin is an open-drain output that goes high (when pulled up externally) once VOUT reaches 90–96 % of VIN and remains high during normal regulation. It asserts low during dropout, overcurrent, or thermal shutdown. The SIP21107DT-285-E3 POK provides real-time system-level power integrity feedback without external circuitry.
Does the SIP21107DT-285-E3 require an external noise bypass capacitor?
No. Unlike the SiP21106 variant, the SIP21107DT-285-E3 does not require an external capacitor on the POK pin for noise reduction. Its internal architecture achieves 350 µV(rms) output noise (10 Hz–100 kHz) without a BP capacitor, simplifying layout and reducing component count compared to SiP21106-based designs.
What is the maximum output current and dropout voltage of the SIP21107DT-285-E3?
The SIP21107DT-285-E3 delivers up to 150 mA continuous output current with a typical dropout voltage of 135 mV at that load. At lighter loads (e.g., 50 mA), dropout drops to 45 mV. This enables stable 2.85 V regulation from input voltages as low as 2.985 V, making the SIP21107DT-285-E3 ideal for single-cell Li-ion battery applications.
How does the SIP21107DT-285-E3 handle shutdown and output discharge?
When the EN pin is driven below 0.4 V, the SIP21107DT-285-E3 enters shutdown mode, reducing supply current to ≤1 µA. Simultaneously, an internal 100 Ω NMOS connects VOUT to GND, discharging a 1 µF output capacitor to <100 mV in under 1 ms. This ensures rapid, deterministic output collapse-critical for clean reset sequencing in portable systems.
Is the SIP21107DT-285-E3 still available for new designs given its End-of-Life status?
Yes-Aetrix Electronics maintains legacy inventory and offers lifecycle support for the SIP21107DT-285-E3. While Vishay declared End-of-Life with a last purchase date of 31-Dec-2014, Aetrix provides traceable, tested stock and coordinated supply planning to support ongoing production and repair of legacy systems relying on the SIP21107DT-285-E3.
SIP21107DT-285-E3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Siliconix
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 2.85V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.22V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 85 µA
- Current - Supply (Max):
- -
- PSRR:
- 72dB ~ 38dB (1kHz ~ 100kHz)
- Control Features:
- Enable, Power Good
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
SIP21107DT-285-E3 FAQ
1.How can I place an order for SIP21107DT-285-E3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SIP21107DT-285-E3 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 SIP21107DT-285-E3 reliable?
The price and inventory of SIP21107DT-285-E3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SIP21107DT-285-E3 is usually 5 days.
3.What payment methods are accepted for SIP21107DT-285-E3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SIP21107DT-285-E3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SIP21107DT-285-E3?
SIP21107DT-285-E3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SIP21107DT-285-E3 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 SIP21107DT-285-E3?
For technical support, including SIP21107DT-285-E3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SIP21107DT-285-E3 requirements.
6.How does Aetrix verify that SIP21107DT-285-E3 is sourced from the original manufacturer or authorized distributors?
All SIP21107DT-285-E3 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 SIP21107DT-285-E3 meets industry standards.
7.What is the process for return or replacement of SIP21107DT-285-E3?
All SIP21107DT-285-E3 units undergo pre-shipment inspection (PSI). If there is an issue with SIP21107DT-285-E3, 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 SIP21107DT-285-E3 part is unused and in its original packaging.
Return procedure for SIP21107DT-285-E3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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