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Analog Devices Inc. LTC2903IS6-C1#TRPBF
- Part No.:
- LTC2903IS6-C1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC2903IS6-C1#TRPBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,564
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Product details
Overview
LTC2903IS6-C1#TRPBF from Analog Devices (formerly Linear Technology) is a precision quad supply monitor IC in 6-lead TSOT-23 package, designed to supervise 5V, 3.3V, 1.8V, and –5.2V rails simultaneously with ±1.5% threshold accuracy over temperature. It features active-low open-drain RST output, 200ms reset timeout, ultralow 0.5V guaranteed reset operation, and power supply glitch immunity - used in multivoltage telecom and server power systems.
For engineers reviewing the LTC2903IS6-C1#TRPBF datasheet, LTC2903IS6-C1#TRPBF pinout, LTC2903IS6-C1#TRPBF application, or LTC2903IS6-C1#TRPBF equivalent, key selection considerations include its –5.2V monitoring capability, internal VCC generation from V1/V2, low 20µA quiescent current, and guaranteed RST sink down to 0.5V - critical for brownout resilience in high-density power architectures.
Technical Context
The LTC2903IS6-C1#TRPBF implements four independent voltage comparators referenced to a bandgap, each with ±1.5% accuracy across –40°C to +85°C. Its reset delay generator enforces a 200ms (140–260ms) hold time after all inputs exceed thresholds, preventing false resets during transient dips.
VCC is autonomously derived from the higher of V1 or V2 (5V and 3.3V respectively), enabling self-powered operation without external bias. The RST output uses an internal weak pull-up to V2 and delivers robust low-voltage pull-down (≤150mV at 5µA, VCC = 0.5V), supporting reliable reset assertion even during deep undervoltage events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Monitored Voltages | 5V (VRT50), 3.3V (VRT33), 1.8V (VRT18), –5.2V (VRT52N) - fixed thresholds per variant C1 |
| Threshold Accuracy | ±1.5% over –40°C to +85°C - ensures predictable reset timing under thermal stress |
| Reset Timeout | 200ms nominal (140–260ms min/max) - prevents chatter during marginal supply recovery |
| Quiescent Current | 20µA typical - enables use in always-on, low-power subsystems |
| RST Low Voltage | ≤150mV at 5µA sink, VCC = 0.5V - guarantees logic-low assertion below 1V supply |
| Supply Range (V1/V2) | –0.3V to 6.5V - supports mixed-sign rail supervision including negative supplies |
| Operating Temp | –40°C to +85°C (I-grade) - qualified for industrial and telecom environments |
Pinout & Package
Package: 6-lead TSOT-23 (ThinSOT™), 1mm profile, JEDEC MO-193 compliant. Dimensions: 2.90mm × 1.60mm × 0.80–0.90mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 (Pin 1) | Main positive input / VCC source | Supplies internal VCC when ≥ V2; monitors 5V rail (VRT50 = 4.425V typ); bypass with 0.1µF |
| GND (Pin 2) | Reference ground | Common return for all comparators and RST pull-down circuitry |
| V2 (Pin 3) | Secondary positive input / VCC source | Supplies VCC if > V1; monitors 3.3V rail (VRT33 = 2.921V typ); bypass with 0.1µF |
| V3 (Pin 4) | Third positive input | Monitors 1.8V rail (VRT18 = 1.593V typ); assists RST pull-down below 1V |
| V4 (Pin 5) | Negative supply input | Monitors –5.2V rail (VRT52N = –4.602V typ); rated –6.5V to 0.3V |
| RST (Pin 6) | Active-low open-drain reset output | Pulls low when any input < threshold; internal ~10µA pull-up to V2; requires external pull-up for >V2 logic levels |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow-voltage reset | RST guaranteed functional down to VCC = 0.5V - enables supervision during deep brownouts |
| Four-rail simultaneous monitoring | Dedicated thresholds for 5V/3.3V/1.8V/–5.2V - eliminates need for external resistor dividers on fixed rails |
| Glitch-immune comparator design | No hysteresis; uses transient-duration filtering (≥150µs overdrive required) - preserves ±1.5% accuracy while rejecting noise |
| Self-powered architecture | VCC generated internally from V1 or V2 - removes dependency on auxiliary bias supply |
| Low-profile SOT-23 packaging | 6-pin TSOT-23 (1mm height) - fits space-constrained PCB layouts in optical networking and base station modules |
Applications
| Telecom Power Sequencing | Optical Networking Line Cards |
|---|---|
Use Scenario: Supervising 5V control logic, 3.3V FPGA I/O, 1.8V core, and –5.2V analog bias on dense line card PCBs. IC Role / Device Role / Timing Role: Quad-supply monitor with 200ms reset hold-off ensuring synchronized power-up of mixed-voltage ASICs and transceivers. Use Value: Prevents partial initialization failures by holding RST low until all rails stabilize - critical for SERDES lock reliability. |
Use Scenario: Monitoring bias supplies for EML drivers and TIA amplifiers in 10G/25G optical modules where –5.2V rails enable wide dynamic range. IC Role / Device Role / Timing Role: Negative-rail-capable supervisor providing fault detection on legacy analog bias networks. Use Value: Direct –5.2V monitoring avoids error-prone resistor-divider solutions and maintains ±1.5% accuracy without calibration. |
| Cell Phone Base Station RF Front-End | Industrial Network Server PSU |
Use Scenario: Validating multi-rail DC/DC outputs feeding PA bias, LNA, and digital control in compact macrocell radios. IC Role / Device Role / Timing Role: Low-quiescent-current (20µA) supervisor enabling always-on health monitoring without impacting standby power budget. Use Value: Enables fail-safe shutdown before RF stage damage occurs during undervoltage transients on sensitive analog rails. |
Use Scenario: Verifying redundant 5V/3.3V/1.8V outputs from hot-swap controllers and PMBus-regulated supplies in 1U servers. IC Role / Device Role / Timing Role: Glitch-immune quad monitor with 200ms debounce - rejects switching noise from adjacent VRMs. Use Value: Eliminates spurious resets caused by load-step-induced ripple, improving system uptime in mission-critical infrastructure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2900CS6#TRMPBF | 16 selectable threshold combinations (software-configurable via pins); same ±1.5% accuracy and 200ms timeout; no –5.2V support | Requires external configuration resistors for non-standard rails; lacks native negative rail monitoring | Choose when flexible rail assignment is needed but –5.2V supervision is unnecessary |
| LTC2902IS6#TRPBF | Includes RST disable function and adjustable tolerance (5%/10%); identical pinout and C1-compatible thresholds | Enables dynamic reset inhibition during firmware updates; tolerance adjustment trades accuracy for margin flexibility | Choose when system-level reset control or field-programmable trip points are required |
Compared with LTC2900CS6#TRMPBF and LTC2902IS6#TRPBF, the LTC2903IS6-C1#TRPBF uniquely provides factory-trimmed –5.2V supervision without external components, making it optimal for legacy telecom designs requiring direct negative rail monitoring at minimal BOM cost.
Availability
LTC2903IS6-C1#TRPBF is available at Aetrix Electronics and suitable for multivoltage systems, optical networking equipment, and cell phone base station power management requiring stable component supply across industrial temperature ranges.
Supply support for LTC2903IS6-C1#TRPBF 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 the LTC portfolio.
The LTC2903 series was designed specifically for high-accuracy, low-power quad supply monitoring in space-constrained telecom and computing infrastructure - emphasizing ultralow-voltage reset, glitch immunity, and mixed-sign rail capability.
FAQ
What is the guaranteed minimum VCC operating voltage for LTC2903IS6-C1#TRPBF?
The LTC2903IS6-C1#TRPBF guarantees full functionality - including RST output sinking capability - down to VCC = 0.5V. At this level, it can sink ≥5µA with VOL ≤ 150mV, enabling reliable reset assertion during severe brownout conditions where other supervisors fail.
Does LTC2903IS6-C1#TRPBF require external resistors to monitor the –5.2V rail?
No. The LTC2903IS6-C1#TRPBF has a dedicated V4 input rated for –6.5V to 0.3V and factory-trimmed for –5.2V (VRT52N = –4.602V typical). Unlike adjustable variants, it monitors –5.2V directly without external resistor dividers or calibration.
How does the LTC2903IS6-C1#TRPBF generate its internal supply voltage (VCC)?
The LTC2903IS6-C1#TRPBF generates VCC autonomously from the higher of the V1 (5V) or V2 (3.3V) supply inputs. This self-powered architecture eliminates the need for an external bias rail and ensures operation as long as either V1 or V2 is present above –0.3V.
What is the reset timeout behavior if one monitored rail drops below threshold during the 200ms window?
If any input falls below its threshold during the 200ms reset timeout period, the LTC2903IS6-C1#TRPBF clears the timer and holds RST low until all four rails remain above threshold for a continuous 200ms interval - providing robust immunity to intermittent supply glitches.
Can the RST output of LTC2903IS6-C1#TRPBF be pulled up to a voltage higher than V2?
Yes, but an external pull-up resistor must be used. The internal pull-up connects to V2 and cannot exceed V2. To drive RST to a higher logic level (e.g., 5V in a 3.3V system), connect an external resistor between RST and the target voltage rail - the open-drain structure supports wired-OR configurations and level translation.
LTC2903IS6-C1#TRPBF 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:
- 1.593V, 2.921V, 4.425V, -4.602V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC2903IS6-C1#TRPBF FAQ
1.How can I place an order for LTC2903IS6-C1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2903IS6-C1#TRPBF 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 LTC2903IS6-C1#TRPBF reliable?
The price and inventory of LTC2903IS6-C1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2903IS6-C1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2903IS6-C1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2903IS6-C1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2903IS6-C1#TRPBF?
LTC2903IS6-C1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2903IS6-C1#TRPBF 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 LTC2903IS6-C1#TRPBF?
For technical support, including LTC2903IS6-C1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2903IS6-C1#TRPBF requirements.
6.How does Aetrix verify that LTC2903IS6-C1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2903IS6-C1#TRPBF 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 LTC2903IS6-C1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2903IS6-C1#TRPBF?
All LTC2903IS6-C1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2903IS6-C1#TRPBF, 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 LTC2903IS6-C1#TRPBF part is unused and in its original packaging.
Return procedure for LTC2903IS6-C1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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