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Texas Instruments TL-SCSI285KCE3
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- Part No.:
- TL-SCSI285KCE3
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-3
- Datasheet:
-
TL-SCSI285KCE3.pdf
- Description:
- IC REG LIN 2.85V 620MA TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,396
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Product details
Overview
TL-SCSI285KCE3 from Texas Instruments is a fixed-output, low-dropout linear regulator engineered exclusively for SCSI Alternative 2 active termination, delivering a precise 2.85-V output with ±1% tolerance at 25°C, 0.7-V dropout at 500 mA, and 620-mA output current capability in the TO-220 (KC) package. It replaces passive resistor networks in SCSI bus terminators to reduce power consumption and improve noise margin in server backplanes and storage controllers.
For engineers reviewing the TL-SCSI285KCE3 datasheet, TL-SCSI285KCE3 pinout, TL-SCSI285KCE3 application, or TL-SCSI285KCE3 equivalent, key selection criteria include its guaranteed 2.85-V regulation accuracy under full load, thermal protection across 0°C–125°C junction range, compatibility with 110-Ω line impedance matching, and support for TERMPWR supply isolation in legacy SCSI-2/SCSI-3 systems.
Technical Context
The TL-SCSI285KCE3 implements a monolithic low-dropout regulator architecture with internal current limiting, thermal overload shutdown, and overvoltage protection - all essential for unattended operation in SCSI backplane environments. Its bias current scales with asserted signal lines (3–6 mA for 1 line; 26–49 mA for 18-line 8-bit bus), enabling accurate current sourcing without external sensing.
Unlike general-purpose LDOs, it is characterized specifically for SCSI termination compliance: output voltage remains stable across VI = 3.55 V to 5.5 V input range and IO = 20 mA to 620 mA load, with ≤30 mV output regulation and –62 dB ripple rejection at 120 Hz - critical for suppressing switching noise from adjacent logic supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.85 V ±1% at TJ = 25°C; ensures tight line-driver current tolerance per SCSI Alternative 2 spec |
| Dropout Voltage | 0.7 V max at 500 mA; enables operation with low TERMPWR headroom down to 3.55 V input |
| Output Current | 620 mA max (KC package); supports full 18-signal SCSI-3 bus termination with margin |
| Thermal Protection | Internal shutdown at TJ ≥ 150°C; prevents latch-up during sustained overload in enclosed chassis |
| Ripple Rejection | –62 dB at 120 Hz; suppresses AC-coupled noise from shared 5-V logic rails feeding TERMPWR |
| Output Noise | 500 µV RMS (10 Hz–100 kHz); avoids injection of broadband noise into sensitive SCSI differential receivers |
| Operating Range | 0°C to 125°C virtual junction temperature; qualified for industrial-server ambient conditions |
Pinout & Package
TL-SCSI285KCE3 is housed in a TO-220 (KC) package with exposed heat sink tab electrically connected to GND. The tab must be grounded for thermal performance and EMI control. Package thermal impedance θJA = 22°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INPUT | Regulator input | Accepts 3.55–5.5 V TERMPWR; requires 0.1-µF ceramic bypass capacitor |
| GND | Ground reference & heat sink | Common return for output current and thermal path; mounting base is electrically tied to this pin |
| OUTPUT | Regulated 2.85-V source | Drives 110-Ω termination resistors; requires 22-µF tantalum output capacitor with 1.5-Ω ESR |
Key Features
| Feature | Design Value |
|---|---|
| SCSI Alternative 2 Compliance | Guaranteed 2.85-V output meets ANSI X3.131-1994 termination voltage requirement |
| Low Dropout Operation | 0.7-V dropout enables use with degraded TERMPWR rails common in aging SCSI backplanes |
| Integrated Protection | Combines overcurrent limit, thermal shutdown, and overvoltage clamp - no external protection needed |
| Line Impedance Matching | Stable output allows direct series connection with 110-Ω resistors to match SCSI cable Z₀ = 110 Ω ±10% |
| Bias Current Scaling | Current draw increases linearly with number of asserted SCSI signals (e.g., 26–49 mA for full 8-bit bus) |
Applications
| SCSI-2 Server Backplane Termination | SCSI-3 RAID Controller Termination |
|---|---|
|
Use Scenario: Active termination on 16-bit wide SCSI-2 backplanes in rack-mounted file servers where passive termination causes excessive heat and voltage droop. IC Role / Device Role / Timing Role: Provides regulated 2.85-V TERMPWR reference for 16× 110-Ω termination networks, replacing discrete resistor+Zener schemes. Use Value: Reduces continuous power dissipation by >60% versus passive 220/330-Ω networks while maintaining signal integrity up to 10 MB/s transfer rates. |
Use Scenario: Termination of high-density SCSI-3 (Ultra SCSI) interfaces in enterprise RAID controllers supporting 20+ drives. IC Role / Device Role / Timing Role: Supplies stable 2.85-V bias to dual 110-Ω terminators per differential pair, ensuring consistent common-mode voltage across hot-swap bays. Use Value: Eliminates timing skew caused by resistor tolerance drift over temperature, improving setup/hold margins for 20 MB/s synchronous transfers. |
| Battery-Powered SCSI Docking Station | Legacy Industrial SCSI Instrumentation |
|
Use Scenario: Portable SCSI docking station powered from 5-V USB PD or 7.4-V Li-ion battery with variable input voltage. IC Role / Device Role / Timing Role: Regulates TERMPWR from declining battery voltage while maintaining 2.85-V output until input drops to 3.55 V. Use Value: Extends usable battery life by enabling termination down to lower input voltages than standard 3.3-V LDOs allow. |
Use Scenario: Retrofitting active termination into decades-old industrial test equipment with failing passive terminators and unstable +5-V rails. IC Role / Device Role / Timing Role: Replaces obsolete 2.85-V Zener-based termination modules with single-chip solution requiring no recalibration. Use Value: Restores SCSI bus reliability without PCB redesign; operates continuously at 125°C junction temperature in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SCSI termination regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL-SCSI285KCSE3 | Same die, RoHS-compliant KC package with Sn finish; identical electrical specs and pinout | Direct replacement for new production requiring lead-free compliance; same thermal performance | Select when RoHS certification and Pb-free finish are mandatory for final product certification |
| TL-SCSI285PWR | TSSOP-20 package; 500-mA max output; higher θJA (83°C/W); requires PCB copper pour for thermal management | Suitable for space-constrained designs but not drop-in for TO-220 footprints; needs layout revision | Choose only if board real estate is constrained and thermal design accommodates lower current rating |
Compared with TL-SCSI285KCSE3, TL-SCSI285KCE3 offers identical performance but lacks RoHS compliance; compared with TL-SCSI285PWR, it delivers higher output current and superior thermal dissipation in legacy through-hole layouts - making it the preferred choice for repair, replacement, and industrial retrofits where footprint and reliability are prioritized over lead-free requirements.
Availability
TL-SCSI285KCE3 is available at Aetrix Electronics and suitable for SCSI-2/SCSI-3 server backplanes, RAID controller refurbishment, and industrial instrumentation termination requiring stable component supply across extended lifecycle programs.
Supply support for TL-SCSI285KCE3 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
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and communications markets.
The TL-SCSI285KCE3 belongs to TI's legacy SCSI interface power management portfolio, designed specifically to replace passive termination networks with integrated, thermally robust regulators meeting ANSI SCSI standards.
FAQ
What is the primary function of the TL-SCSI285KCE3 in a SCSI system?
The TL-SCSI285KCE3 serves as a fixed 2.85-V low-dropout regulator dedicated to SCSI Alternative 2 active termination. It replaces passive resistor networks (220 Ω / 330 Ω) by providing a stable, current-limited voltage reference that drives 110-Ω termination resistors - directly enabling impedance matching, reducing power consumption, and improving noise margin on SCSI buses. Its design ensures compliance with ANSI X3.131-1994 and supports both SCSI-2 and SCSI-3 implementations.
Does the TL-SCSI285KCE3 require external capacitors, and what are their specifications?
Yes, the TL-SCSI285KCE3 requires two external capacitors: a 0.1-µF ceramic capacitor across INPUT–GND and a 22.0-µF tantalum capacitor on OUTPUT–GND with 1.5-Ω equivalent series resistance (ESR). These values are specified in the datasheet for stability across the full load and temperature range. Deviating from these values risks oscillation or poor transient response - particularly critical when driving multiple 110-Ω terminators simultaneously in high-speed SCSI configurations.
How does the TL-SCSI285KCE3 handle thermal overload conditions?
The TL-SCSI285KCE3 incorporates internal thermal-overload protection that disables the output when the virtual junction temperature reaches approximately 150°C. Recovery is automatic once the die cools below the thermal shutdown hysteresis threshold. This feature protects the device during sustained overload, inadequate heatsinking, or elevated ambient temperatures - common in densely packed SCSI backplanes. Its TO-220 (KC) package has θJA = 22°C/W, so proper mounting to a grounded copper plane is essential for reliable operation at 620 mA.
Can the TL-SCSI285KCE3 be used outside of SCSI termination applications?
No - the TL-SCSI285KCE3 is purpose-built for SCSI Alternative 2 active termination and is not characterized or recommended for general-purpose regulation. Its bias current scaling, output tolerance band, and protection thresholds are optimized specifically for SCSI bus signaling requirements. Using it in non-SCSI applications may result in unverified performance, undefined startup behavior, or premature thermal shutdown due to mismatched load profiles. For generic 2.85-V LDO needs, TI recommends alternatives like the LP2951 or TPS7A47.
What is the significance of the "E3" suffix in TL-SCSI285KCE3?
"E3" denotes the TI packaging and finishing variant: it indicates the TO-220 (KC) package with matte tin (Sn) lead finish, compliant with JEDEC J-STD-020 moisture sensitivity level (MSL) requirements, and processed per TI's standard assembly flow for industrial-grade products. While functionally identical to TL-SCSI285KC, the E3 suffix confirms traceability, surface finish specification, and qualification for through-hole reflow or wave soldering - important for manufacturing consistency in repair and legacy production scenarios involving the TL-SCSI285KCE3.
TL-SCSI285KCE3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.85V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.8V @ 620mA
- Current - Output:
- 620mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 62dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Over Voltage
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-3
TL-SCSI285KCE3 FAQ
1.How can I place an order for TL-SCSI285KCE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL-SCSI285KCE3 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 TL-SCSI285KCE3 reliable?
The price and inventory of TL-SCSI285KCE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL-SCSI285KCE3 is usually 5 days.
3.What payment methods are accepted for TL-SCSI285KCE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL-SCSI285KCE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL-SCSI285KCE3?
TL-SCSI285KCE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL-SCSI285KCE3 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 TL-SCSI285KCE3?
For technical support, including TL-SCSI285KCE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL-SCSI285KCE3 requirements.
6.How does Aetrix verify that TL-SCSI285KCE3 is sourced from the original manufacturer or authorized distributors?
All TL-SCSI285KCE3 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 TL-SCSI285KCE3 meets industry standards.
7.What is the process for return or replacement of TL-SCSI285KCE3?
All TL-SCSI285KCE3 units undergo pre-shipment inspection (PSI). If there is an issue with TL-SCSI285KCE3, 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 TL-SCSI285KCE3 part is unused and in its original packaging.
Return procedure for TL-SCSI285KCE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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