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Analog Devices Inc. LTC2903CS6-E1#TRPBF
- Part No.:
- LTC2903CS6-E1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC2903CS6-E1#TRPBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,273
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Product details
Overview
LTC2903CS6-E1#TRPBF from Analog Devices (formerly Linear Technology) is a precision quad supply monitor IC in 6-lead TSOT-23 package, designed to supervise four voltage rails simultaneously with guaranteed reset assertion down to VCC = 0.5V. It monitors fixed 5V on V1 and three adjustable inputs (V2/V3/V4) referenced to an internal 0.5V bandgap, supports ±1.5% threshold accuracy over temperature, and delivers 200ms reset timeout - used in multivoltage telecom power systems and optical networking equipment.
For engineers reviewing the LTC2903CS6-E1#TRPBF datasheet, LTC2903CS6-E1#TRPBF pinout, LTC2903CS6-E1#TRPBF application, or LTC2903CS6-E1#TRPBF equivalent, key selection criteria include its 5V/ADJ/ADJ/ADJ monitoring configuration, ultralow-voltage reset capability (0.5V VCC guarantee), 5% undervoltage tolerance, 20µA quiescent current, and open-drain RST output with V1-referenced weak pull-up.
Technical Context
The LTC2903CS6-E1#TRPBF implements four independent comparators tied to a shared 200ms reset delay timer and low-voltage pull-down circuitry powered solely from V1 (per datasheet Note 3). Its internal VCC is derived exclusively from V1, enabling reliable reset assertion even when other monitored supplies are absent or below 1V.
All three adjustable inputs (V2, V3, V4) compare against a stable 0.500V ±0.008V internal reference; trip voltage is set via external resistor dividers using VTRIP = 0.5 × (1 + R1/R2). Threshold accuracy remains ±1.5% over –40°C to 85°C, with no hysteresis applied to preserve precision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 4.675V typical (5V, 5% undervoltage detection) |
| V2/V3/V4 Threshold | 0.500V ±0.008V internal reference for adjustable inputs |
| Reset Timeout | 200ms nominal delay ensures glitch immunity during brownout recovery |
| Quiescent Current | 20µA typical - enables use in battery-backed or ultra-low-power systems |
| Min VCC for RST | 0.5V guaranteed - allows reset assertion during deep brownout of primary supply |
| RST Output Type | Active-low open-drain with internal weak pull-up to V1 (no external pull-up required for basic operation) |
| Threshold Accuracy | ±1.5% over full operating temperature range (–40°C to 85°C) |
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) | Main supply input & internal VCC source | Supplies all internal circuitry; must be ≥4.6V for 5V monitoring; bypass with 0.1µF capacitor |
| GND (Pin 2) | Analog and digital ground reference | Common return path for all comparators and reset logic; requires low-impedance connection |
| V2 (Pin 3) | Adjustable voltage input | Compares external divided voltage against 0.5V reference; supports custom thresholds via R1/R2 |
| V3 (Pin 4) | Adjustable voltage input | Same function as V2; independent comparator with identical 0.5V reference |
| V4 (Pin 5) | Adjustable voltage input | Same function as V2/V3; enables supervision of three additional rails beyond fixed V1 |
| RST (Pin 6) | Open-drain reset output | Pulls low when any input falls below threshold; held low for 200ms after all inputs recover |
Key Features
| Feature | Design Value |
|---|---|
| Triple adjustable monitoring | V2, V3, V4 each accept resistor-divided inputs referenced to precise 0.500V internal bandgap |
| Ultralow-voltage reset guarantee | RST remains functional with VCC as low as 0.5V - critical for fail-safe brownout response |
| No hysteresis design | Maintains ±1.5% threshold accuracy without degrading spec via intentional hysteresis |
| Glitch-immune comparator architecture | Rejects transients <150µs unless overdrive exceeds 1% of threshold - prevents false resets |
| V1-only power derivation | Eliminates dependency on secondary supplies for internal operation - simplifies system sequencing |
Applications
| Optical Networking Power Sequencing | Cellular Base Station DC-DC Monitoring |
|---|---|
Use Scenario: Supervising 5V bias rail plus three programmable intermediate voltages (e.g., 3.3V, 2.5V, 1.8V) across multiple DC-DC converters in fiber transceiver modules. IC Role / Device Role / Timing Role: Quad-supply monitor providing synchronized 200ms reset pulse upon any rail dropout, ensuring clean FPGA/CPU reinitialization. Use Value: Eliminates need for discrete supervisor ICs per rail; 0.5V VCC guarantee ensures reset integrity even during partial power loss. |
Use Scenario: Monitoring main 5V system rail and three adjustable auxiliary rails (e.g., RF PA bias, analog front-end, clock distribution) in macrocell BTS power subsystems. IC Role / Device Role / Timing Role: Precision voltage supervisor enforcing strict undervoltage lockout (UVLO) with 5% tolerance on all four rails before releasing system reset. Use Value: ±1.5% threshold accuracy reduces required system voltage margin, improving power supply design headroom. |
| Multivoltage Telecom Equipment | Industrial Embedded Controller Power-Up |
Use Scenario: Validating 5V backplane supply and three field-programmable rails (e.g., 12V analog, 3.3V I/O, 1.2V core) in carrier-grade Ethernet switches. IC Role / Device Role / Timing Role: Single-chip quad monitor replacing multiple discrete supervisors, with RST asserted until all four rails stabilize for ≥200ms. Use Value: TSOT-23 footprint saves PCB area vs. MSOP alternatives; 20µA quiescent current minimizes standby losses. |
Use Scenario: Ensuring reliable boot of ARM-based industrial controllers by supervising 5V main supply and three configurable peripheral rails (e.g., sensor interface, CAN transceiver, isolated ADC). IC Role / Device Role / Timing Role: Reset generator with adjustable thresholds enabling one IC to cover diverse board variants without redesign. Use Value: Resistor-divider flexibility allows reuse across product families - reducing BOM count and qualification effort. |
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-D1#TRPBF | Fixed 3.3V V1 threshold (3.086V typ); same triple-adjustable architecture | Better suited for 3.3V-centric systems where primary rail is lower than 5V | Select D1 when main supply is 3.3V and E1's 5V V1 threshold would exceed system requirements |
| LTC2900CS6-5#TRPBF | 16 user-selectable fixed thresholds (no adjustable inputs); same 6-lead TSOT-23 package | Limited to predefined combinations - lacks flexibility for custom rail voltages | Choose LTC2900CS6-5#TRPBF only if all four rails match factory-set thresholds and design change is unacceptable |
Compared with LTC2903CS6-D1#TRPBF, the LTC2903CS6-E1#TRPBF provides higher primary rail supervision (5V vs 3.3V), while differing from LTC2900CS6-5#TRPBF by offering field-programmable thresholds instead of fixed options - enabling single-BOM support across multiple voltage configurations.
Availability
LTC2903CS6-E1#TRPBF is available at Aetrix Electronics and suitable for multivoltage telecom equipment, optical networking systems, and cellular base station power management requiring stable component supply and long-term lifecycle assurance.
Supply support for LTC2903CS6-E1#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 technical and manufacturing continuity for the LTC portfolio, including precision power monitoring ICs.
The LTC2903CS6-E1#TRPBF belongs to Linear's high-accuracy voltage supervisor family, engineered specifically for telecom and networking infrastructure where supply margin constraints demand ±1.5% threshold stability and sub-1V reset reliability.
FAQ
What is the exact V1 threshold voltage specification for LTC2903CS6-E1#TRPBF?
The LTC2903CS6-E1#TRPBF has a nominal V1 threshold of 4.675V (5V × 95%), with guaranteed min/max values of 4.600V and 4.750V respectively over the full –40°C to 85°C operating range. This 5% undervoltage detection window is specified in the Electrical Characteristics table under symbol VRT50 for the E1 variant.
Can LTC2903CS6-E1#TRPBF monitor negative voltages like –5.2V?
No. The LTC2903CS6-E1#TRPBF is configured for positive-supply monitoring only: V1 is fixed at 5V, and V2/V3/V4 are adjustable positive-input comparators referenced to 0.5V. The –5.2V capability exists only in the LTC2903-C1 variant; applying negative voltage to any pin of LTC2903CS6-E1#TRPBF violates Absolute Maximum Ratings and may damage the device.
How does the RST output behave when V1 drops below 0.5V?
The LTC2903CS6-E1#TRPBF guarantees RST functionality down to VCC = 0.5V, but operation below this voltage is not characterized. When V1 falls below 0.5V, internal circuitry ceases to function reliably - RST state becomes undefined, and the device cannot assert or maintain a valid reset signal. System design must ensure V1 remains ≥0.5V during fault conditions where reset integrity is required.
What external components are mandatory for stable operation of LTC2903CS6-E1#TRPBF?
A 0.1µF ceramic bypass capacitor is mandatory between V1 and GND (Pin 1 to Pin 2) per datasheet recommendations. No bypass is required on V2/V3/V4 for standard noise environments, though 0.1µF capacitors may be added in high-noise applications. An external pull-up resistor on RST is optional and only needed if faster rise time or voltage level exceeding V1 is required.
Is LTC2903CS6-E1#TRPBF pin-compatible with other LTC2903 variants in S6 package?
Yes - all LTC2903 variants in the S6 (TSOT-23) package share identical pinout: V1, GND, V2, V3, V4, RST. However, electrical behavior differs significantly between variants (e.g., fixed vs adjustable thresholds, VCC derivation source), so direct substitution without circuit review is not recommended despite mechanical compatibility.
LTC2903CS6-E1#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:
- 4.675V, 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-E1#TRPBF FAQ
1.How can I place an order for LTC2903CS6-E1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2903CS6-E1#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 LTC2903CS6-E1#TRPBF reliable?
The price and inventory of LTC2903CS6-E1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2903CS6-E1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2903CS6-E1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2903CS6-E1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2903CS6-E1#TRPBF?
LTC2903CS6-E1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2903CS6-E1#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 LTC2903CS6-E1#TRPBF?
For technical support, including LTC2903CS6-E1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2903CS6-E1#TRPBF requirements.
6.How does Aetrix verify that LTC2903CS6-E1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2903CS6-E1#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 LTC2903CS6-E1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2903CS6-E1#TRPBF?
All LTC2903CS6-E1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2903CS6-E1#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 LTC2903CS6-E1#TRPBF part is unused and in its original packaging.
Return procedure for LTC2903CS6-E1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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