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Analog Devices Inc. LTC2903CS6-D1#TRMPBF
- Part No.:
- LTC2903CS6-D1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC2903CS6-D1#TRMPBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:6,056
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Product details
Overview
LTC2903CS6-D1#TRMPBF from Analog Devices (formerly Linear Technology) is a precision quad supply monitor IC in 6-lead TSOT-23 package, designed for multivoltage systems requiring simultaneous monitoring of one fixed and three adjustable voltage rails. It guarantees ±1.5% threshold accuracy over temperature, features 5% undervoltage detection on all adjustable inputs, delivers 200ms reset timeout, and operates with ultralow VCC down to 0.5V - enabling reliable power-up sequencing in optical networking and telecom base station power management.
For engineers reviewing the LTC2903CS6-D1#TRMPBF datasheet, LTC2903CS6-D1#TRMPBF pinout, LTC2903CS6-D1#TRMPBF application, or LTC2903CS6-D1#TRMPBF equivalent, key selection considerations include its 3.086V fixed V1 threshold (3.3V ±5%), 0.500V internal reference for V2/V3/V4 adjustable inputs, open-drain RST output with V1-referenced weak pull-up, and guaranteed reset assertion below 0.5V supply - critical for brownout resilience in low-voltage embedded systems.
Technical Context
The LTC2903CS6-D1#TRMPBF implements four independent comparators referenced to a bandgap-derived 0.500V internal reference for V2, V3, and V4, while V1 uses a dedicated 3.086V (3.3V ±5%) threshold. Internal VCC is generated solely from V1, eliminating dependency on V2–V4 for operation.
Its reset logic holds RST low until all four inputs exceed their thresholds for a guaranteed 200ms (140–260ms range), with no hysteresis applied to preserve ±1.5% accuracy. The RST output provides active-low open-drain signaling with pulldown strength derived exclusively from V1, supporting sink currents down to 0.1µA at VCC = 0.2V and up to 2500µA at VCC = 3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V (3.3V ±5%) - fixed trip point for primary rail monitoring |
| V2/V3/V4 Threshold | 0.500V ±0.008V - internal reference enabling adjustable monitoring via resistor dividers |
| Threshold Accuracy | ±1.5% over temperature - ensures predictable reset behavior across industrial range |
| Reset Timeout | 200ms nominal (140–260ms) - prevents spurious resets during transient supply dips |
| Supply Current | 20µA typical - enables use in battery-backed or ultra-low-power systems |
| Min VCC Operation | 0.5V guaranteed - supports reset assertion even during deep brownout conditions |
| RST Sink Capability | 5µA @ VCC = 0.5V, VOL ≤ 150mV - maintains valid logic low under ultra-low supply |
Pinout & Package
Package: 6-lead TSOT-23 (ThinSOT™), 1.00mm max height, JEDEC MO-193 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 (Pin 1) | Primary voltage input & VCC source | Supplies internal regulator; sets fixed 3.086V threshold; bypass with ≥0.1µF capacitor |
| GND (Pin 2) | Ground reference | Common return for all comparators and RST output |
| V2 (Pin 3) | Adjustable voltage input | Monitored against 0.500V reference; requires external resistor divider for trip setting |
| V3 (Pin 4) | Adjustable voltage input | Monitored against same 0.500V reference; independent of V2/V4 thresholds |
| V4 (Pin 5) | Adjustable voltage input | Third adjustable input; enables full quad monitoring of custom rail voltages |
| RST (Pin 6) | Open-drain reset output | Active-low signal; internal weak pull-up to V1; sinks current from V1 only |
Key Features
| Feature | Design Value |
|---|---|
| Triple adjustable inputs (V2/V3/V4) | Enables monitoring of any positive supply >0.55V using standard resistor dividers - no fixed-rail constraints |
| 0.5V internal reference | Provides stable, temperature-invariant trip point for all adjustable inputs - eliminates external reference need |
| V1-only VCC generation | Removes dependency on secondary supplies for operation - ensures functionality even if V2/V3/V4 are unpowered |
| No comparator hysteresis | Maintains ±1.5% threshold accuracy without degrading specification via intentional offset |
| Glitch-immune transient filtering | Rejects sub-150µs noise spikes - prevents false resets in electrically noisy telecom environments |
Applications
| Optical Networking Power Sequencing | Cell Phone Base Station Supervision |
|---|---|
Use Scenario: Monitoring multiple DC/DC converter outputs (e.g., 12V, 3.3V, 2.5V, 1.8V) during cold start and hot-swap events in SFP+ line cards. IC Role / Device Role / Timing Role: Quad supply monitor asserting system reset until all rails stabilize above thresholds for 200ms. Use Value: Prevents FPGA configuration errors by ensuring clean power-up sequence; 0.5V VCC operation allows reset hold during partial rail collapse. | Use Scenario: Supervising distributed power domains (BBU, RF, control logic) in macrocell BTS where voltage margins are tight and brownouts frequent. IC Role / Device Role / Timing Role: Simultaneous monitoring of 5V (control), 3.3V (interface), and two adjustable rails (e.g., 1.2V core, 1.0V memory) with single reset output. Use Value: ±1.5% threshold accuracy reduces required system voltage margin by 15mV vs ±2.5% alternatives - improving power efficiency and thermal headroom. |
| Industrial Server Management | Embedded Telecom Edge Router |
Use Scenario: Validating redundant 3.3V and 5V supplies plus two programmable rails (e.g., 1.8V PHY, 1.2V SoC) in modular server blades. IC Role / Device Role / Timing Role: Fixed V1 (3.3V) + three ADJ inputs provide flexible rail coverage without redesigning supervisor circuitry. Use Value: 20µA quiescent current minimizes standby power draw across hundreds of blades; TSOT-23 footprint saves PCB area vs MSOP alternatives. | Use Scenario: Monitoring PoE-powered subsystems (48V-to-3.3V, 48V-to-1.8V) alongside auxiliary 5V and adjustable bias rails in compact edge routers. IC Role / Device Role / Timing Role: V2/V3/V4 configured via resistor dividers to track scaled-down PoE-derived rails while V1 guards main logic supply. Use Value: Eliminates need for multiple discrete supervisors - reduces BOM count and improves timing correlation between rail monitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2903CS6-E1#TRMPBF | Fixed V1 threshold = 4.675V (5V ±5%); identical V2/V3/V4 adjustable architecture | Targeted at 5V-primary systems instead of 3.3V-primary; same pinout and package | Select when main supply is 5V and adjustable rails require monitoring |
| LTC2900CS6-3#TRMPBF | Quad monitor with 16 user-selectable fixed thresholds; no adjustable inputs; ±1.5% accuracy | Requires pre-defined rail combinations; lacks flexibility for custom voltages | Choose for cost-sensitive designs with standard rail sets and no need for resistor-divider tuning |
Compared with LTC2903CS6-E1#TRMPBF, the LTC2903CS6-D1#TRMPBF provides lower fixed-threshold headroom for 3.3V systems, while versus LTC2900CS6-3#TRMPBF it trades configurability for design flexibility - enabling precise monitoring of non-standard rails without changing hardware.
Availability
LTC2903CS6-D1#TRMPBF is available at Aetrix Electronics and suitable for optical networking systems, cell phone base stations, and network servers requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC2903CS6-D1#TRMPBF 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
Analog Devices acquired Linear Technology in 2017 and maintains full product support, manufacturing, and documentation for legacy Linear parts including the LTC2903 family.
The LTC2903 series was designed specifically for high-accuracy, low-power multivoltage supervision in space-constrained telecom and networking equipment - emphasizing ultralow VCC operation, triple-adjustable inputs, and glitch immunity.
FAQ
What is the fixed voltage threshold for V1 on the LTC2903CS6-D1#TRMPBF?
The LTC2903CS6-D1#TRMPBF has a fixed V1 threshold of 3.086V, corresponding to a 3.3V supply with ±5% tolerance. This value is guaranteed across the full operating temperature range (–40°C to 85°C) with ±1.5% accuracy relative to the monitored voltage, per the device's electrical characteristics table.
How does the LTC2903CS6-D1#TRMPBF generate its internal supply voltage (VCC)?
The LTC2903CS6-D1#TRMPBF derives its internal supply voltage (VCC) exclusively from the V1 pin - unlike other variants that select between V1 and V2. This architecture ensures operation remains functional even if V2, V3, or V4 are unpowered or floating, making the LTC2903CS6-D1#TRMPBF robust in partial-power scenarios.
Can the LTC2903CS6-D1#TRMPBF monitor negative voltages?
No, the LTC2903CS6-D1#TRMPBF cannot monitor negative voltages. Its V2, V3, and V4 inputs are specified for positive adjustable monitoring only, with minimum input voltage of 0.55V. For negative rail supervision, the LTC2903CS6-C1 variant supports –5.2V on V4, but the LTC2903CS6-D1#TRMPBF is limited to positive supplies.
What is the purpose of the 0.500V internal reference in the LTC2903CS6-D1#TRMPBF?
The 0.500V internal reference in the LTC2903CS6-D1#TRMPBF serves as the comparison point for all three adjustable inputs (V2, V3, V4). By referencing external resistor dividers to this stable, temperature-compensated voltage, designers can precisely set trip points for arbitrary positive supply voltages - enabling flexible rail monitoring without external references or trimming.
Does the LTC2903CS6-D1#TRMPBF require external pull-up resistors on the RST pin?
The LTC2903CS6-D1#TRMPBF includes an internal weak pull-up to V1 on the RST pin, sufficient for basic operation. However, an external pull-up resistor is recommended when faster rise times are needed or when pulling RST to a voltage higher than V1 - as the internal pull-up cannot exceed V1 and may be too slow for high-speed digital interfaces.
LTC2903CS6-D1#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 4
- Voltage - Threshold:
- 3.086V, Adj, Adj, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC2903CS6-D1#TRMPBF FAQ
1.How can I place an order for LTC2903CS6-D1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2903CS6-D1#TRMPBF 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 LTC2903CS6-D1#TRMPBF reliable?
The price and inventory of LTC2903CS6-D1#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2903CS6-D1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2903CS6-D1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2903CS6-D1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2903CS6-D1#TRMPBF?
LTC2903CS6-D1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2903CS6-D1#TRMPBF 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 LTC2903CS6-D1#TRMPBF?
For technical support, including LTC2903CS6-D1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2903CS6-D1#TRMPBF requirements.
6.How does Aetrix verify that LTC2903CS6-D1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2903CS6-D1#TRMPBF 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 LTC2903CS6-D1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2903CS6-D1#TRMPBF?
All LTC2903CS6-D1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2903CS6-D1#TRMPBF, 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 LTC2903CS6-D1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2903CS6-D1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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