TL2218-285PWR Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
TL2218-285PWR is a current-mode SCSI bus terminator IC by Texas Instruments providing active termination for 9 SCSI signal lines. Key specs: 2.85 V regulated termination voltage, 9 terminated signal lines, and a 20-pin TSSOP package with 0.25 mm pitch. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- END OF LIFE
- Datasheet
- TL2218-285PWR Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $2.4200(MOQ 79)
- Temp Range
- ?°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Current-mode active SCSI termination for 9 signal lines simultaneously, replacing bulky passive resistor networks with a single compact IC
- 2.85 V regulated termination voltage meeting SCSI-2 and Ultra SCSI active termination specifications for reliable high-speed bus operation
- 20-pin TSSOP package with 0.25 mm pitch enabling dense PCB integration in space-constrained SCSI storage and server backplane designs
Applications
The TL2218-285PWR is used as the active terminator at the end of SCSI-2, Fast SCSI, and Ultra SCSI bus chains in disk array controllers, RAID storage systems, and server backplanes where precise 2.85 V active termination is required to minimize signal reflections and maximize data integrity at bus speeds up to 20 MHz. Its 9-channel integration reduces BOM complexity compared to discrete resistor termination networks, making it the preferred solution for high-density storage enclosures and embedded industrial data acquisition systems using legacy SCSI interfaces.
Specifications
| Pbfree Code | Yes |
| YTEOL | 0 |
| Differential Output | NO |
| Interface IC Type | SCSI BUS TERMINATOR |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Number of Signal Lines | 9 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP20,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Voltage-Max | 5.5V |
| Supply Voltage-Min | 3.5V |
| Supply Voltage-Nom | 4.75V |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Temperature Grade | OTHER |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
| Country of Origin | Malaysia |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What termination voltage does the TL2218-285PWR provide and why is 2.85 V the correct level for active SCSI termination?
The TL2218-285PWR regulates each of its 9 SCSI signal lines to 2.85 V, which is the standard TERMPWR-derived active termination voltage specified in the SCSI-2 and Ultra SCSI standards. This voltage is set at half the termination power supply range to maximize noise margin on the differential bus, reducing reflections at the bus ends and ensuring reliable detection of logic transitions at bus speeds up to 20 MHz and transfer rates up to 20 MB/s.
How many SCSI signal lines does the TL2218-285PWR terminate and what bus standards does it support?
The TL2218-285PWR actively terminates 9 SCSI signal lines in a single IC, covering the 9 data bits (8 data + 1 parity) of a narrow SCSI bus. It meets the active termination requirements of SCSI-2, Fast SCSI (10 MHz / 10 MB/s), and Ultra SCSI (20 MHz / 20 MB/s) standards. For wide SCSI (16-bit) buses, two TL2218 devices or a wide-bus terminator variant is used to cover all 18 lines.
How does active termination with TL2218-285PWR differ from passive resistor termination on a SCSI bus?
Passive SCSI termination uses two resistors per line forming a voltage divider between TERMPWR and GND, which draws constant current regardless of bus state and can cause voltage droop when multiple devices drive the bus simultaneously. Active termination with TL2218-285PWR uses a current-mode regulator that maintains a constant 2.85 V at each pin while sourcing only the required current, resulting in lower power consumption, better noise immunity at 20 MHz Ultra SCSI rates, and compliance with the active termination specification that passive networks cannot meet.
What package does the TL2218-285PWR use and how does it simplify PCB layout compared to discrete termination resistors?
The TL2218-285PWR is housed in a 20-pin TSSOP package with 0.25 mm pin pitch, occupying a footprint of approximately 6.5 mm × 4.4 mm. This single device replaces 18 discrete resistors (two per SCSI line) that would otherwise require significantly more PCB area and individual placement and soldering, reducing assembly cost and the risk of mismatch between individual termination resistors on high-speed SCSI signal lines.
Is TL2218-285PWR still available for procurement and what are typical applications still using SCSI interfaces?
TL2218-285PWR is available from authorized Texas Instruments distributors for maintenance and legacy system support. While modern storage systems have largely transitioned to SAS and NVMe, SCSI interfaces remain active in industrial automation controllers, medical imaging equipment (MRI, CT scanner storage subsystems), and military/aerospace data recorders that were designed and validated for SCSI and have long operational lifespans where interface changes are cost-prohibitive.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 79+ | $3.7900 | $299.41 |
| 500+ | $2.7300 | $1365.00 |
| 1000+ | $2.5800 | $2580.00 |
| 10000+ | $2.4200 | $24200.00 |
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