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Texas Instruments TCA9802DGKR
- Part No.:
- TCA9802DGKR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
TCA9802DGKR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,656
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Product details
Overview
TCA9802DGKR from Texas Instruments is a dual-channel bidirectional I²C/SMBus level-translating buffer with integrated B-side current source (2.2 mA typical), supporting 0.8 V–3.6 V on A-side and 1.65 V–3.6 V on B-side, ultra-low quiescent current (34 µA total at 1.8 V), and true buffering without static voltage offset-used in server backplanes to isolate high-speed I²C segments across mixed-voltage domains.
For engineers reviewing the TCA9802DGKR datasheet, TCA9802DGKR pinout, TCA9802DGKR application, or TCA9802DGKR equivalent, key selection criteria include B-side current-source strength (2.2 mA), bus capacitance limit (400 pF), propagation delay (75–260 ns), UVLO thresholds (VCCA: 0.55 V, VCCB: 1.51 V), and absence of external B-side pull-up resistors.
Technical Context
The TCA9802DGKR implements true bidirectional buffering-not pass-FET translation-using an internal current source on the B-side to detect low-level contention without static voltage offset, enabling sub-0.26 V VOL on both sides. It supports clock stretching and multi-master arbitration while maintaining signal integrity across voltage domains.
No power sequencing dependency exists: VCCA may be less than, equal to, or greater than VCCB. The EN pin is active-high referenced to VCCA and does not disable the B-side current source when low-only disables data path coupling between A- and B-sides.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| A-side supply range | 0.8 V to 3.6 V - enables direct interface with ultra-low-voltage processors (e.g., 0.8 V I/O cores) |
| B-side supply range | 1.65 V to 3.6 V - compatible with 1.8 V/2.5 V/3.3 V I²C peripherals without level-shifter resistors |
| B-side current source | 2.2 mA typical (±25%) - eliminates external B-side pull-ups and improves rise time on capacitive buses |
| Max bus capacitance (B-side) | 400 pF - supports up to 10–12 standard-mode I²C slaves on extended traces |
| Propagation delay | 75–260 ns - ensures timing compliance for 400 kHz I²C Fast Mode with margin |
| Total quiescent current | 34 µA at 1.8 V/1.8 V - critical for always-on system management controllers in power-sensitive servers |
| UVLO thresholds | VCCA: 0.55 V (rising), VCCB: 1.51 V (rising) - prevents metastable operation during brown-out conditions |
Pinout & Package
Package: VSSOP-8 (DGK), 3.00 mm × 3.00 mm, 0.65 mm pitch, thermal pad optional.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCCA | A-side supply input | Reference for SCLA/SDAA I/O and EN logic; powers A-side circuitry only |
| 2 - SCLA | A-side serial clock I/O | Must connect to VCCA via pull-up resistor even if unused; high-impedance when powered off |
| 3 - SDAA | A-side serial data I/O | Must connect to VCCA via pull-up resistor even if unused; high-impedance when powered off |
| 4 - GND | Analog/digital ground | Common reference for all supplies and I/O; requires low-inductance connection to system ground plane |
| 5 - EN | Active-high enable input | Referenced to VCCA; internal 150–450 kΩ pull-up; does not disable B-side current source when low |
| 6 - SDAB | B-side serial data I/O | NO external pull-up allowed; relies solely on internal 2.2 mA current source; floats if unused |
| 7 - SCLB | B-side serial clock I/O | NO external pull-up allowed; relies solely on internal 2.2 mA current source; floats if unused |
| 8 - VCCB | B-side supply and device core supply | Powers B-side I/O and internal current source; determines B-side UVLO and VOL performance |
Key Features
| Feature | Design Value |
|---|---|
| Integrated B-side current source | 2.2 mA typical eliminates external pull-up resistors, reduces board area, and improves rise time on 400 pF buses |
| No static voltage offset | VOL ≤ 0.26 V on both sides avoids false low detection in systems with tight VIL thresholds (e.g., < 0.4 V) |
| Powered-off high-impedance A-side pins | SCLA/SDAA enter Hi-Z when VCCA or VCCB drops below UVLO - enables hot-plug I²C segment isolation |
| Back-power protection | All I²C pins block reverse current flow into VCCA/VCCB - prevents unintended power injection from live buses |
| Multi-master & clock stretch support | Preserves arbitration timing and stretch acknowledgment handoff without signal degradation or latch-up |
Applications
| Server Baseboard Management | Rack-Mount Industrial Controller |
|---|---|
|
Use Scenario: Isolating BMC (Baseboard Management Controller) I²C bus from mixed-voltage sensor and FRU EEPROM networks across redundant power domains. IC Role / Device Role / Timing Role: Bidirectional repeater enabling 0.8 V BMC core to communicate with 3.3 V temperature sensors and 1.8 V SPD EEPROMs without voltage conflict or timing violation. Use Value: Eliminates need for discrete level shifters and pull-up networks, reducing BOM count by 6 components per I²C segment while maintaining 400 kHz timing margin. |
Use Scenario: Extending I²C distance between PLC CPU module (1.8 V I/O) and distributed I/O modules (2.5 V/3.3 V) over 15 cm PCB traces with >200 pF loading. IC Role / Device Role / Timing Role: Level-translating buffer providing low-VOL coupling and controlled propagation delay to meet I²C Fast Mode setup/hold requirements. Use Value: Enables reliable communication across long traces without signal integrity loss, avoiding bus lockup due to marginal VOL or slow rise times. |
| Power-Sensitive Edge Gateway | Multi-Rail Embedded PC |
|
Use Scenario: Interfacing ultra-low-power microcontroller (0.8 V I/O) with battery-backed RTC and PMBus power monitors (3.3 V) in always-on IoT gateway. IC Role / Device Role / Timing Role: Low-quiescent-current (34 µA) repeater preserving battery life while enabling full I²C functionality across voltage islands. Use Value: Reduces standby current by >90% versus discrete MOSFET-based translators, extending coin-cell lifetime beyond 5 years. |
Use Scenario: Managing voltage-domain isolation between CPU VRM telemetry (1.2 V SMBus) and chassis fan controllers (3.3 V I²C) in compact mini-ITX motherboards. IC Role / Device Role / Timing Role: Dual-channel buffer decoupling SMBus and I²C domains with independent enable control per channel. Use Value: Prevents cross-domain noise coupling and allows independent reset sequencing of power rails without bus contention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I²C level-translating buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TCA9801DGKR | 1.1 mA B-side current source (vs. 2.2 mA); lower drive strength limits max bus capacitance to ~200 pF | Better suited for low-capacitance, low-power sensor nodes where 400 pF headroom is unnecessary | Select when optimizing for lowest possible ICCB in idle state (33 µA vs. 60 µA at 1.8 V) |
| TCA9803DGKR | 3.3 mA B-side current source (vs. 2.2 mA); supports >400 pF loads and faster rise times on heavy buses | Required for high-density server backplanes with >15 I²C devices or >25 cm trace lengths | Select when driving >300 pF loads or requiring margin for future bus expansion |
Compared with TCA9801DGKR and TCA9803DGKR, the TCA9802DGKR delivers optimal balance of drive strength (2.2 mA), power efficiency (34 µA total IQ), and 400 pF bus support-making it the default choice for mainstream server, industrial, and embedded PC designs where cost, size, and performance must coexist.
Availability
TCA9802DGKR is available at Aetrix Electronics and suitable for server baseboard management, industrial PLC I/O expansion, and power-sensitive edge gateways requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for TCA9802DGKR 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 specializing in analog, embedded processing, and connectivity technologies, with leadership in industrial, automotive, and communications markets.
The TCA9802DGKR belongs to TI's I²C level-shifting buffer family designed specifically for robust, low-power, mixed-voltage system management interfaces in servers, networking equipment, and industrial automation.
FAQ
What is the maximum supported bus capacitance on the B-side of the TCA9802DGKR?
The TCA9802DGKR supports a maximum bus capacitance of 400 pF on the B-side (SDAB/SCLB pins). This value is specified in the Electrical Characteristics table under CBUS parameter. Exceeding this capacitance violates device operation and may cause communication failure, unlike the A-side which has no defined capacitance limit. The 400 pF rating enables reliable 400 kHz Fast Mode I²C operation with multiple slave devices on extended PCB traces.
Does the TCA9802DGKR require external pull-up resistors on the B-side I²C lines?
No, the TCA9802DGKR does not require-and explicitly prohibits-external pull-up resistors on SDAB or SCLB. Its integrated 2.2 mA B-side current source replaces them entirely. Adding external pull-ups introduces parasitic IEXT-I leakage that can prevent proper low-level detection by violating the IILC (low-level input current contention) specification of 800 µA. The datasheet mandates leaving SDAB/SCLB floating if unused.
Can VCCA be lower than VCCB in the TCA9802DGKR?
Yes, VCCA may be lower than, equal to, or higher than VCCB in the TCA9802DGKR-no power sequencing dependency exists. For example, VCCA = 0.8 V (processor I/O) and VCCB = 3.3 V (peripheral supply) is fully supported. This flexibility is enabled by true buffering architecture with independent A/B-side voltage references and absence of static voltage offset, allowing seamless up-translation and down-translation.
What happens to the A-side pins (SCLA/SDAA) when VCCA is unpowered?
When VCCA falls below its UVLO threshold (0.55 V), the SCLA and SDAA pins enter a powered-off high-impedance state, electrically isolating the A-side bus. This behavior is confirmed in Section 9.3.5 and allows safe hot-plug operation: the A-side I²C bus remains functional for other devices even while the TCA9802DGKR is unpowered, preventing bus lockup or contention.
Is the EN pin of the TCA9802DGKR compatible with 1.8 V logic when VCCA = 0.8 V?
No-the EN pin is referenced to VCCA and requires VIH ≥ 0.7 × VCCA to register as high. At VCCA = 0.8 V, VIH(min) = 0.56 V, so a 1.8 V logic signal would exceed absolute maximum ratings (VEN max = 4 V but violates recommended operating condition VIH ≤ VCCA). To interface with 1.8 V logic, use a level translator or ensure EN is driven from the same domain as VCCA.
TCA9802DGKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Translator Type:
- Voltage Level
- Channel Type:
- Bidirectional
- Number of Circuits:
- 1
- Channels per Circuit:
- 2
- Voltage - VCCA:
- 0.8 V ~ 3.6 V
- Voltage - VCCB:
- 1.65 V ~ 3.6 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Non-Inverted
- Data Rate:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
TCA9802DGKR FAQ
1.How can I place an order for TCA9802DGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TCA9802DGKR 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 TCA9802DGKR reliable?
The price and inventory of TCA9802DGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TCA9802DGKR is usually 5 days.
3.What payment methods are accepted for TCA9802DGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TCA9802DGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TCA9802DGKR?
TCA9802DGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TCA9802DGKR 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 TCA9802DGKR?
For technical support, including TCA9802DGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TCA9802DGKR requirements.
6.How does Aetrix verify that TCA9802DGKR is sourced from the original manufacturer or authorized distributors?
All TCA9802DGKR 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 TCA9802DGKR meets industry standards.
7.What is the process for return or replacement of TCA9802DGKR?
All TCA9802DGKR units undergo pre-shipment inspection (PSI). If there is an issue with TCA9802DGKR, 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 TCA9802DGKR part is unused and in its original packaging.
Return procedure for TCA9802DGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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