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Analog Devices Inc. LTC2903IS6-B1#TRPBF
- Part No.:
- LTC2903IS6-B1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC2903IS6-B1#TRPBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL TSOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2903IS6-B1#TRPBF from Analog Devices (formerly Linear Technology) is a precision quad supply monitor IC in a 6-lead TSOT-23 package, designed to supervise four independent voltage rails-5V, 3.3V, 2.5V, and 1.8V-with ±1.5% threshold accuracy over temperature. It delivers active-low open-drain reset output with 200ms delay, ultralow 20µA quiescent current, and guaranteed reset assertion down to VCC = 0.5V. It is deployed in multivoltage systems such as optical networking equipment and network servers for reliable power-up sequencing and brownout protection.
For engineers reviewing the LTC2903IS6-B1#TRPBF datasheet, LTC2903IS6-B1#TRPBF pinout, LTC2903IS6-B1#TRPBF application, or LTC2903IS6-B1#TRPBF equivalent, key selection considerations include its fixed 10% undervoltage thresholds per rail, internal VCC generation from V1/V2, low-voltage pull-down capability below 1V, and compatibility with noisy industrial power environments requiring glitch immunity and no external hysteresis.
Technical Context
The LTC2903IS6-B1#TRPBF implements four independent comparators referenced to a bandgap-derived 0.5V core, each scaled to match nominal input voltages (5V, 3.3V, 2.5V, 1.8V). Its reset logic holds RST low until all four inputs exceed their respective thresholds for a continuous 200ms window, with built-in transient filtering that rejects sub-150µs glitches exceeding 1% of threshold.
VCC is autonomously generated from the higher of V1 or V2 (5V and 3.3V respectively), eliminating need for external bias. The RST output features an internal ~10µA weak pull-up to V2 and robust pulldown strength derived from V1/V2/V3-enabling reliable reset assertion even when monitored supplies dip to 0.5V while maintaining VOL ≤ 150mV at 5µA sink current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Monitored Voltages | 5V (V1), 3.3V (V2), 2.5V (V3), 1.8V (V4) - fixed thresholds per pin, no external resistors required |
| Threshold Accuracy | ±1.5% over –40°C to +85°C - enables tight system voltage margining without derating for supervisor error |
| Reset Delay | 200ms (140–260ms min–max) - ensures stable power delivery before releasing system reset |
| Supply Current | 20µA typical - supports battery-backed or ultra-low-power applications without compromising supervision integrity |
| RST Output Type | Active-low open-drain with internal ~10µA pull-up to V2 - allows wired-OR reset buses and flexible external pull-up to higher voltages |
| Min Operating VCC | 0.5V guaranteed - maintains reset assertion during deep brownout, preventing floating RST node and erroneous logic states |
| Input Leakage | V1: 25–80µA, V2: 10–30µA, V3: 10–30µA, V4: 2–4µA - minimizes loading on sensitive or high-impedance supply rails |
Pinout & Package
Package: 6-lead TSOT-23 (ThinSOT™), 1mm height, JEDEC MO-193 compliant. Pin 1 marked with dot; pin 1–6 arranged linearly with GND at pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 (Pin 1) | Main voltage input / VCC source | Monitors 5V rail; supplies internal VCC when ≥ V2; bypass with 0.1µF capacitor |
| GND (Pin 2) | Reference ground | Common return for all comparators, reset logic, and internal reference |
| V2 (Pin 3) | Secondary voltage input / VCC source | Monitors 3.3V rail; supplies VCC if > V1; internal pull-up target for RST |
| V3 (Pin 4) | Tertiary voltage input | Monitors 2.5V rail; assists RST pulldown circuitry below 1V |
| V4 (Pin 5) | Quaternary voltage input | Monitors 1.8V rail; contributes to low-voltage pulldown strength |
| RST (Pin 6) | Reset logic output | Open-drain active-low signal; sinks ≥5µA at VOL ≤ 150mV (VCC = 0.5V) |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow-voltage reset assertion | Guaranteed RST low down to VCC = 0.5V - prevents undefined logic states during deep brownout |
| No external hysteresis required | Proprietary comparator transient filtering rejects <150µs noise spikes - preserves ±1.5% threshold accuracy |
| Autonomous VCC generation | VCC derived from greater of V1 or V2 - eliminates need for dedicated bias supply or LDO |
| Glitch-immune reset timing | 200ms timeout counter resets on any threshold violation - prevents oscillatory reset during noisy transients |
| Low-profile SOT-23 footprint | 6-pin TSOT-23 (1mm height) - enables dense PCB layouts in space-constrained telecom and server modules |
Applications
| Optical Networking Line Cards | Cell Phone Base Station Power Management |
|---|---|
|
Use Scenario: Supervising 5V, 3.3V, 2.5V, and 1.8V rails powering SERDES, DSPs, and RF front-end ICs in high-density line cards subject to thermal cycling and EMI. IC Role / Device Role / Timing Role: Quad-rail monitor ensuring synchronized power-up and brownout detection across mixed-signal subsystems; 200ms reset delay prevents premature release during supply settling. Use Value: Eliminates need for discrete supervisors or FPGA-based monitoring, reducing BOM count and layout area while guaranteeing ±1.5% threshold stability over –40°C to +85°C. |
Use Scenario: Monitoring distributed DC/DC outputs feeding baseband processors, memory, and transceiver ASICs in outdoor macrocell cabinets exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Precision voltage supervisor providing fault-tolerant reset signaling to system controller; internal VCC generation avoids dependency on single-point-of-failure bias rail. Use Value: 20µA quiescent current extends backup battery life; 0.5V VCC operation ensures fail-safe reset assertion during AC loss or converter collapse. |
| Network Server Motherboard | Industrial Embedded Controller |
|
Use Scenario: Validating core, I/O, memory, and auxiliary rails on dual-CPU server motherboards where simultaneous multi-rail sequencing and reliability are critical. IC Role / Device Role / Timing Role: Centralized quad-supply monitor interfacing with BMC/IPMI via open-drain RST; supports wired-OR reset bus with other supervisory ICs. Use Value: Fixed 10% thresholds eliminate resistor selection errors; ±1.5% accuracy reduces required system voltage margin by 15–25mV per rail versus ±2.5% alternatives. |
Use Scenario: Ensuring deterministic boot behavior in fanless industrial controllers powered from unregulated 24V DC-DC converters with variable load-induced ripple. IC Role / Device Role / Timing Role: Robust power-good detector immune to supply noise; glitch filtering prevents spurious resets near threshold crossings. Use Value: No external hysteresis needed - preserves specified accuracy without degrading performance; 6-lead SOT-23 simplifies rework and automated assembly. |
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 user-selectable voltage combinations via pin-strapping; same ±1.5% accuracy and 200ms delay but lacks ultralow 0.5V VCC operation | Preferred when design requires configurable thresholds (e.g., 3.3V/2.5V/1.8V/1.2V) rather than fixed B1 set | Select LTC2900 if future voltage variants or field-programmable thresholds are needed; LTC2903IS6-B1#TRPBF is optimal for cost-sensitive, fixed-rail deployments. |
| LTC2902IS6#TRPBF | Includes RST disable function and adjustable tolerance (5% or 10%); identical pinout and B1 voltage set but adds EN pin for reset inhibition | Suitable when system-level firmware must temporarily suppress reset during diagnostics or hot-swap events | Choose LTC2902 only if RST disable capability is required; otherwise LTC2903IS6-B1#TRPBF offers lower cost and simpler integration. |
Compared with LTC2900 and LTC2902, the LTC2903IS6-B1#TRPBF provides the most direct fit for fixed 5V/3.3V/2.5V/1.8V monitoring with best-in-class 0.5V VCC operation and lowest quiescent current-making it ideal for thermally constrained, high-reliability infrastructure applications where configurability is unnecessary.
Availability
LTC2903IS6-B1#TRPBF is available at Aetrix Electronics and suitable for optical networking systems, cell phone base stations, and network servers requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance across –40°C to +85°C.
Supply support for LTC2903IS6-B1#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, datasheet documentation, and manufacturing continuity for the LTC portfolio.
The LTC2903 series belongs to Linear's precision power supervision product line, engineered specifically for multivoltage digital systems demanding high threshold accuracy, low power consumption, and robust noise immunity in telecom and computing infrastructure.
FAQ
What is the operating temperature range for the LTC2903IS6-B1#TRPBF?
The LTC2903IS6-B1#TRPBF is rated for industrial temperature operation from –40°C to +85°C. This range is confirmed in the Absolute Maximum Ratings table and applies to all electrical specifications marked with the ● symbol in the Electrical Characteristics section. The device is qualified per Linear Technology's standard industrial reliability test flow, making it suitable for deployment in base station radios, optical line cards, and server motherboards exposed to extended thermal profiles.
Does the LTC2903IS6-B1#TRPBF require external resistors to set its voltage thresholds?
No, the LTC2903IS6-B1#TRPBF does not require external resistors. It is factory-configured for fixed 10% undervoltage thresholds: 4.425V (5V), 2.921V (3.3V), 2.213V (2.5V), and 1.593V (1.8V). These values are laser-trimmed during production and guaranteed over temperature. External resistors are only used with adjustable variants like LTC2903-D1 or -E1-not with the LTC2903IS6-B1#TRPBF.
How does the LTC2903IS6-B1#TRPBF generate its internal supply voltage (VCC)?
The LTC2903IS6-B1#TRPBF generates its internal VCC automatically from the higher of the two primary supply inputs: V1 (5V) or V2 (3.3V). This eliminates the need for a separate bias supply. When both are present, VCC tracks the greater voltage; if only one is active, VCC derives from that rail. This architecture ensures operation even if one monitored rail fails, and enables guaranteed reset assertion down to VCC = 0.5V.
Can the RST output of the LTC2903IS6-B1#TRPBF drive a microcontroller reset pin directly?
Yes, the RST output of the LTC2903IS6-B1#TRPBF can drive a microcontroller reset pin directly when used with an appropriate external pull-up resistor (e.g., 10kΩ to VCC or IOVDD). Its open-drain structure and guaranteed sink capability (≥5µA at VOL ≤ 150mV, VCC = 0.5V) ensure clean, noise-immune reset signaling. The internal ~10µA pull-up to V2 is insufficient for most MCUs, so an external pull-up is recommended for reliable rise time and voltage level compliance.
What makes the LTC2903IS6-B1#TRPBF more noise-immune than basic reset ICs?
The LTC2903IS6-B1#TRPBF achieves superior noise immunity through two integrated mechanisms: (1) proprietary comparator transient filtering that rejects glitches shorter than ~150µs-even at 1% overdrive-and (2) a 200ms reset timeout counter that clears on any threshold violation, preventing oscillation. Unlike competitors using hysteresis-which degrades stated accuracy-the LTC2903IS6-B1#TRPBF maintains ±1.5% threshold precision while rejecting noise.
LTC2903IS6-B1#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, 2.213V, 2.921V, 4.425V
- 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-B1#TRPBF FAQ
1.How can I place an order for LTC2903IS6-B1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2903IS6-B1#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-B1#TRPBF reliable?
The price and inventory of LTC2903IS6-B1#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-B1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2903IS6-B1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2903IS6-B1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2903IS6-B1#TRPBF?
LTC2903IS6-B1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2903IS6-B1#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-B1#TRPBF?
For technical support, including LTC2903IS6-B1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2903IS6-B1#TRPBF requirements.
6.How does Aetrix verify that LTC2903IS6-B1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2903IS6-B1#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-B1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2903IS6-B1#TRPBF?
All LTC2903IS6-B1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2903IS6-B1#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-B1#TRPBF part is unused and in its original packaging.
Return procedure for LTC2903IS6-B1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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