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Vishay Siliconix SIP21108DT-T1-E3
- Part No.:
- SIP21108DT-T1-E3
- Manufacturer:
- Vishay Siliconix
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
SIP21108DT-T1-E3.pdf
- Description:
- IC REG LIN POS ADJ 150MA TSOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,049
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Product details
Overview
SIP21108DT-T1-E3 from Vishay Siliconix is an adjustable-output, 150-mA low-noise, low-dropout linear regulator featuring 135 mV dropout at full load, 1.2 V feedback reference, and ultra-low 35 µA ground current at 1 mA. It employs a P-channel MOSFET pass device and supports stable operation with 1 µF ceramic output capacitors. Designed for battery-powered RF systems requiring quiet voltage rails, it enables precise output tuning in portable electronics.
For engineers reviewing the SIP21108DT-T1-E3 datasheet, SIP21108DT-T1-E3 pinout, SIP21108DT-T1-E3 application, or SIP21108DT-T1-E3 equivalent, key selection criteria include its adjustable output architecture, TSOT23-5L package footprint, shutdown auto-discharge (100 Ω), thermal/short-circuit protection, and compatibility with low-ESR ceramic capacitors without external compensation.
Technical Context
The SIP21108DT-T1-E3 uses a constant 1.2005 V bandgap reference and error amplifier to regulate output via an internal P-channel MOSFET pass transistor (typ. 0.9 Ω). Its feedback loop accepts external resistor dividers on the Adj pin to set output voltage across the full input range (2.2–6 V).
It integrates active pull-down during shutdown (100 Ω NMOS discharge path), thermal shutdown at 160 °C with 20 °C hysteresis, and current limiting at 330 mA typical. The device operates over –40 °C to +85 °C ambient and maintains regulation during 330 mA peak turn-on transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 150 mA continuous; 330 mA peak current capability ensures robust start-up into capacitive loads. |
| Dropout Voltage | 135 mV at 150 mA load - enables operation with minimal VIN–VOUT margin, extending battery runtime. |
| Feedback Reference | 1.2005 V (±0.03 V over temperature) - sets precision for externally adjustable output voltage. |
| Ground Current | 35 µA typical at 1 mA load - minimizes quiescent power draw in always-on subsystems. |
| Shutdown Current | 1 µA maximum at 85 °C - preserves battery life during deep sleep modes. |
| Auto-Discharge Resistance | 100 Ω typical - discharges 1 µF output capacitor to <10% VOUT in <1 ms upon disable. |
| Thermal Shutdown | 160 °C junction temperature with 20 °C hysteresis - prevents permanent damage under sustained overload. |
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 | 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 path; must connect to large PCB ground plane for thermal management. |
| 3 - VIN | Input supply | Accepts 2.2–6 V; requires 1 µF ceramic bypass capacitor close to pin for stability and noise rejection. |
| 4 - VOUT | Regulated output | Delivers user-adjusted voltage; supports 1 µF ceramic output capacitor with ESR < 0.4 Ω for stability. |
| 5 - Adj | Feedback adjust input | Connects to resistor divider (R1/R2) to set VOUT = 1.2005 V × (1 + R1/R2); R2 = 100–400 kΩ recommended. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Architecture | Enables precise VOUT programming from ~1.2 V to near VIN using two external resistors - ideal for multi-rail systems. |
| P-Channel MOSFET Pass Device | Eliminates base-drive current loss; achieves ultra-low ground current (35 µA typ.) and stable dropout performance. |
| Integrated Auto-Discharge | 100 Ω internal NMOS pulls VOUT to GND within milliseconds of EN deactivation - prevents floating bias in downstream circuitry. |
| Robust Protection Suite | Combines 330 mA current limit, thermal shutdown (160 °C), and short-circuit survivability - reduces need for external fault management. |
| Ceramic Capacitor Compatibility | Stable with 1 µF low-ESR X7R/Y7R ceramics; eliminates tantalum or electrolytic requirements - lowers BOM cost and board area. |
Applications
| RF Front-End Power | Portable Audio Codec Supply |
|---|---|
|
Use Scenario: Powering low-noise LNA, mixer, or VCO stages in cellular handsets and wireless modems. IC Role / Device Role / Timing Role: Low-noise, low-dropout voltage source delivering clean bias to analog RF blocks. Use Value: 350 µV(rms) output noise (10 Hz–100 kHz) and high PSRR (>72 dB @ 1 kHz) preserve signal integrity and minimize phase noise. |
Use Scenario: Supplying ADC/DAC and headphone amplifier rails in MP3 players and digital cameras. IC Role / Device Role / Timing Role: Adjustable, low-quiescent-current regulator for mixed-signal audio subsystems. Use Value: 1.2 V reference accuracy (±1.0% at 25 °C) and 150 mA output support dynamic headroom needs while minimizing battery drain. |
| Wearable Sensor Hub | Industrial IoT Edge Node |
|
Use Scenario: Powering MEMS accelerometers, gyroscopes, and BLE SoCs in compact wearables. IC Role / Device Role / Timing Role: Compact, thermally efficient LDO enabling space-constrained battery operation. Use Value: TSOT23-5L footprint (3.05 × 2.85 mm) and 1 µF ceramic stability reduce PCB area vs. legacy SOT-23 solutions. |
Use Scenario: Providing regulated supply to microcontrollers and RS-485 transceivers in remote sensor nodes. IC Role / Device Role / Timing Role: Industrial-grade LDO with –40 °C to +85 °C operation and built-in fault protection. Use Value: Thermal shutdown (160 °C) and current limit ensure reliability in unventilated enclosures with variable ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1703T-3302E/MB | Fixed 3.3 V output; no adjustable option; higher 250 mV dropout at 250 mA. | Limited to fixed-voltage use cases; unsuitable where output trimming or multi-rail flexibility is required. | Select only if fixed 3.3 V output suffices and board layout cannot accommodate feedback resistors. |
| TLC7603IDBVR | Adjustable output; 200 mA rating; 250 mV dropout at 200 mA; 65 µA ground current. | Higher quiescent current and larger SC70-5 footprint (2.1 × 2.1 mm) - less optimal for ultra-low-power wearables. | Prefer when higher output current margin is needed and slightly higher IQ is acceptable. |
Compared with MCP1703T-3302E/MB and TLC7603IDBVR, SIP21108DT-T1-E3 delivers superior low-IQ performance (35 µA), lower dropout (135 mV), and smaller TSOT23-5L footprint - making it optimal for space- and battery-limited adjustable-LDO applications.
Availability
SIP21108DT-T1-E3 is available at Aetrix Electronics and suitable for portable medical monitors, wireless sensor nodes, and handheld test equipment requiring stable component supply despite end-of-life status.
Supply support for SIP21108DT-T1-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 high-performance discrete semiconductors and integrated power solutions, emphasizing reliability, efficiency, and miniaturization for demanding electronic systems.
The SiP211xx family targets battery-powered portable electronics needing ultra-low-noise, low-IQ, and small-footprint LDO regulation - with SIP21108DT-T1-E3 specifically optimized for adjustable-output configurations in TSOT23-5L.
FAQ
What is the minimum input voltage required for SIP21108DT-T1-E3 to regulate a 3.3 V output?
The SIP21108DT-T1-E3 requires VIN ≥ VOUT + VDO. With a typical dropout of 135 mV at 150 mA, the minimum input is 3.435 V. However, the absolute minimum specified VIN is 2.2 V - so for 3.3 V output, VIN must be ≥3.435 V to maintain regulation across full load and temperature. Below that, the device enters dropout.
How do I calculate the feedback resistors for a target output voltage with SIP21108DT-T1-E3?
Use VOUT = 1.2005 V × (1 + R1/R2). For example, for 3.3 V output: R1/R2 = (3.3 / 1.2005) − 1 ≈ 1.748. Choose R2 = 200 kΩ (within 100–400 kΩ recommendation), then R1 = 1.748 × 200 kΩ ≈ 349.6 kΩ - use a standard 1% value like 348 kΩ or 357 kΩ.
Does SIP21108DT-T1-E3 require an external bypass capacitor on the Adj pin?
No - unlike the BP pin on SiP21106 or POK on SiP21107, the Adj pin on SIP21108DT-T1-E3 connects directly to the error amplifier's inverting input and requires only the external R1/R2 feedback network. No bypass capacitor is used or specified on this pin.
What is the purpose of the auto-discharge function in SIP21108DT-T1-E3, and how fast does it operate?
The auto-discharge function uses a 100 Ω internal NMOS between VOUT and GND activated when EN is low. It discharges a 1 µF output capacitor from nominal voltage to <10% in under 1 ms - preventing unintended wake-up or latch-up in downstream logic powered by the same rail.
Can SIP21108DT-T1-E3 be used with ceramic capacitors smaller than 1 µF?
No - the datasheet specifies stable operation with "very small ceramic output capacitors" but defines minimum stability at 1 µF (≈6 nF/mA for 150 mA load). Using <1 µF risks instability, poor transient response, and potential oscillation due to insufficient phase margin at the error amplifier's dominant pole.
SIP21108DT-T1-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:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 5.78V
- 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
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
SIP21108DT-T1-E3 FAQ
1.How can I place an order for SIP21108DT-T1-E3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SIP21108DT-T1-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 SIP21108DT-T1-E3 reliable?
The price and inventory of SIP21108DT-T1-E3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SIP21108DT-T1-E3 is usually 5 days.
3.What payment methods are accepted for SIP21108DT-T1-E3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SIP21108DT-T1-E3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SIP21108DT-T1-E3?
SIP21108DT-T1-E3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SIP21108DT-T1-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 SIP21108DT-T1-E3?
For technical support, including SIP21108DT-T1-E3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SIP21108DT-T1-E3 requirements.
6.How does Aetrix verify that SIP21108DT-T1-E3 is sourced from the original manufacturer or authorized distributors?
All SIP21108DT-T1-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 SIP21108DT-T1-E3 meets industry standards.
7.What is the process for return or replacement of SIP21108DT-T1-E3?
All SIP21108DT-T1-E3 units undergo pre-shipment inspection (PSI). If there is an issue with SIP21108DT-T1-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 SIP21108DT-T1-E3 part is unused and in its original packaging.
Return procedure for SIP21108DT-T1-E3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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