LSF0204RUTR - 4-Bit Bidirectional Level Translator | Texas Instruments
Référence : LSF0204RUTR ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $0.65 | $0,65 |
| 10 | $0.58 | $5,80 |
| 100 | $0.45 | $45,00 |
| 500 | $0.38 | $190,00 |
| 1 000 | $0.32 | $320,00 |
| 3 000 | $0.27 | $810,00 |
LSF0204RUTR Présentation
A bidirectional voltage level translator (also called a level shifter or logic-level translator) is an interface IC that connects two logic domains operating at different supply voltages. The LSF0204 belongs to the broader category of voltage translators, which are themselves a sub-category of interface ICs used in mixed-voltage digital systems. Because modern SoCs, microcontrollers, and sensors frequently operate at voltages other than 5 V (1.8 V, 3.3 V, 1.2 V), translators are essential glue logic that prevents damage and signal-integrity problems when devices of different voltage domains must communicate.
Key features of the LSF0204 include 4 channels per package, support for both open-drain (I2C-style) and push-pull (SPI, GPIO) topologies, automatic direction sensing without a DIR pin, and an operating temperature range of -40 °C to +125 °C. The wide voltage range combined with auto-bidirectional operation eliminates the firmware burden of direction control and reduces BOM cost by removing external pull-up/down components on most paths. The compact UQFN-12 footprint is well-suited for space-constrained wearables, mobile devices, and IoT modules.
Architecturally, the LSF0204 uses TI's pass-gate-based translator topology with internal one-shot accelerators that improve rise/fall time when driving capacitive bus loads. This edge-rate enhancement enables clean signals at higher bus speeds than a pure passive FET translator, while still drawing minimal quiescent current. The part supports hot-insertion because both reference rails can be ramped independently, and Ioff (partial-power-down) protection prevents back-feeding when either rail is off.
Typical applications include SD card level shifting between a 1.8 V host SoC and a 3.3 V card, I2C bus translation in multi-voltage sensor hubs, SPI bridging between a low-voltage MCU and 5 V peripherals, SIM/UIM card interfaces, and general-purpose GPIO expansion across voltage domains. The wide voltage window makes it equally well-suited for legacy 5 V systems and modern sub-2 V processors.
When designing with the LSF0204, the engineer should observe one practical rule: pull-up resistors are required on each side for open-drain buses (I2C), with values selected to meet the rise-time budget of the target bus speed; push-pull signals do not require pull-ups but the reference rails must both be present for reliable operation. Place both Vref_A and Vref_B decoupling capacitors within 2 mm of the IC pins.
This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Alternatives de remplacement direct pour LSF0204RUTR — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
Aucune alternative de remplacement direct disponible pour ce produit.
Demander des alternativesLSF0204RUTR Spécifications
| Fonction | Voltage Level Translator, Bidirectional |
| Canaux | 4 |
| Channels per Circuit | 1 circuit, 4 channels |
| Vref_A Range (low-side) | 0.8 V to 4.5 V |
| Vref_B Range (high-side) | 1.8 V to 5.5 V |
| Translation Voltage Range | 0.8 V to 5.0 V (bidirectional) |
| Direction Control | Automatic (no DIR pin required) |
| Topology Support | Open-Drain and Push-Pull |
| Maximum Data Rate | 100 MHz (push-pull, per distributor spec) |
| Type de sortie | Open-Drain / Push-Pull (depends on bus type) |
| Plage de température de fonctionnement | -40 °C to +125 °C |
| Boîtier | UQFN-12 (RUT), 1.7 mm x 2.0 mm |
| Type de montage | Surface Mount |
| Niveau MSL | 1 (per distributor listing) |
| Statut RoHS | Compliant |
| Lead-Free | Yes |
| Automotive Qualification | AEC-Q100 not specified (industrial/consumer) |
| Ioff (Partial-Power-Down) | Supported per family description |
Configuration des broches de LSF0204RUTR
| Broche 1 | A1 — Channel 1 low-voltage side I/O |
| Broche 2 | Vref_A — Low-voltage reference supply (0.8 V to 4.5 V) |
| Broche 3 | A2 — Channel 2 low-voltage side I/O |
| Broche 4 | A3 — Channel 3 low-voltage side I/O |
| Broche 5 | A4 — Channel 4 low-voltage side I/O |
| Broche 6 | EN — Enable input (active high) |
| Broche 7 | B4 — Channel 4 high-voltage side I/O |
| Broche 8 | B3 — Channel 3 high-voltage side I/O |
| Broche 9 | B2 — Channel 2 high-voltage side I/O |
| Broche 10 | B1 — Channel 1 high-voltage side I/O |
| Broche 11 | Vref_B — High-voltage reference supply (1.8 V to 5.5 V) |
| Broche 12 | DAP / GND — Exposed die-attach pad - tie to ground |
Applications typiques
LSF0204RUTR convient pour 7 applications: SD Card Level Shifting, I2C Bus Voltage Translation, SPI Bridge Between Mixed-Voltage Domains, SIM / UIM Card Interface, GPIO Level Translation in Wearables, Industrial Sensor Hub Bridging, UART / General Logic Translation.
SD Card Level Shifting
The LSF0204RUTR is well suited to SD card interface level translation between a 1.8 V or 3.3 V host SoC and a 3.3 V SD card. The four channels cleanly map CMD, CLK, and DAT0-DAT3 lines; the 100 MHz push-pull data rate comfortably exceeds SD UHS-I (50 MHz) and even UHS-II entry speeds. Because the LSF0204RUTR auto-detects direction on each line without a DIR pin, the SD controller does not need extra GPIO. Pull-ups are not required for the push-pull SD lines; Vref_A is tied to the SoC IO domain and Vref_B to the 3.3 V card rail. The UQFN-12 (1.7x2 mm) package fits inside compact wearables and IoT modules where board area is at a premium, and the -40 to +125 °C operating range supports industrial SD card logger designs.
Recommandé
I2C Bus Voltage Translation
The LSF0204RUTR is an excellent I2C / I2C-Fast-Mode / SMBus level translator when the two sides operate at different voltages, for example a 1.8 V sensor and a 3.3 V microcontroller. The device's automatic direction sensing eliminates the need to manage DIR bits in firmware, and the wide Vref_A range (0.8 V to 4.5 V) supports sub-1.8 V modern SoCs. Engineers should select external pull-up resistors on both sides sized for the desired rise time (typically 1 kohm to 10 kohm for Fast-Mode). Compared with TXS0104E which has 4 kohm internal pull-ups, the LSF0204RUTR allows tighter tuning for high-capacitance buses and avoids the static current draw that internal pull-ups create.
Recommandé
SPI Bridge Between Mixed-Voltage Domains
The LSF0204RUTR handles 4-wire SPI bridging between a low-voltage MCU (e.g., 1.8 V) and a 3.3 V or 5 V peripheral such as an LCD driver, NOR flash, or ADC. The four channels cleanly carry MOSI, MISO, SCLK, and CSn in push-pull mode at tens of MHz without direction pin management. Because LSF0204 monitors both sides per channel, it correctly handles SPI's full-duplex traffic without firmware intervention. The wide voltage window (0.8 V to 5.0 V) lets one translator support multiple SPI peripherals at different voltages on the same board, simplifying BOM and reducing the translator chip count versus dedicated unidirectional buffers.
Recommandé
SIM / UIM Card Interface
The LSF0204RUTR is widely used in cellular modules and IoT gateways to translate between the host baseband or MCU (typically 1.8 V) and the SIM card (3 V or 1.8 V class B/C). The four channels cover the SIM I/O, CLK, RST, and VPP lines, and the auto-direction feature means no DIR pin needs to be toggled during card-insertion state changes. The -40 °C to +125 °C industrial temperature range handles outdoor cellular deployments. The UQFN-12 (1.7x2 mm) footprint fits inside miniature LTE-M / NB-IoT modules where every component competes for board area.
Recommandé
GPIO Level Translation in Wearables
Wearable designs such as smartwatches and fitness bands mix a low-voltage application processor (often 1.2 V or 1.8 V) with sensors, displays, and haptics at 3.3 V. The LSF0204RUTR's UQFN-12 (1.7x2 mm) footprint is one of the smallest 4-channel bidirectional translators available, making it ideal for tight wearable layouts. The wide operating voltage range allows one translator to bridge multiple heterogeneous peripherals (touch controller, LED driver, IMU) at different voltages, reducing the chip count and BOM cost. The low quiescent current minimizes impact on battery life in always-on wearable designs.
Recommandé
Industrial Sensor Hub Bridging
In a multi-voltage industrial sensor hub, the LSF0204RUTR bridges between a 3.3 V MCU backplane and lower-voltage sensor front-ends (1.8 V or 2.5 V). The four channels carry I2C, GPIO, and interrupt lines from multiple sensors, with auto-direction sensing eliminating per-channel DIR GPIO usage on the MCU. The -40 °C to +125 °C operating range supports industrial deployments in factories, outdoor cabinets, and process-control systems. Compared with discrete MOSFET translators, the LSF0204RUTR's internal edge-rate accelerators give cleaner signals on long PCB traces, reducing EMI and improving noise margin on capacitive sensor cables.
Recommandé
UART / General Logic Translation
The LSF0204RUTR provides simple UART (TX/RX/RTS/CTS) level translation between two logic domains without requiring a direction pin or external pull-ups for push-pull signals. This is a common need when connecting a 5 V legacy MCU to a 3.3 V Bluetooth module, or a 3.3 V GPS receiver to a 1.8 V application processor. The 100 MHz push-pull data rate far exceeds typical UART speeds (115.2 kbaud to 1 Mbaud), so the translator is never the bandwidth bottleneck. Its wide voltage window and small footprint make it a versatile general-purpose glue-logic translator that design teams can standardize across multiple products.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LSF0204RUTR — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LSF0204PWR |
|---|---|---|
| Package | UQFN-12 (RUT), 1.7 x 2.0 mm | TSSOP-12 (larger, different footprint) |
| Brand | Texas Instruments | Texas Instruments |
| Channels | 4 | 4 |
| Vref_A Range | 0.8 V to 4.5 V | 0.8 V to 4.5 V |
| Vref_B Range | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| Direction Pin | Not required (auto-direction) | Not required (auto-direction) |
| Topology Support | Open-Drain + Push-Pull | Open-Drain + Push-Pull |
| Data Rate | 100 MHz (push-pull) | 100 MHz (push-pull) |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C |
| Unit Price (qty 1) | $0.65 (approx.) | $0.55 (approx.) |
Principaux différenciateurs
- Smallest 4-channel bidirectional translator footprint in TI's portfolio (vs TXS0104EPWR (TSSOP-14))
- No direction pin required - true automatic direction sensing (vs SN74AVC4T774 (UQFN, fixed-direction))
- Wide voltage window supports legacy 5 V and modern sub-2 V domains (vs NXP NTS0104 (1.2 V to 3.6 V per side))
Notes de conception
Vref_A and Vref_B each require a 0.1 µF decoupling capacitor placed within 2 mm of the IC pin; a 1 µF bulk capacitor on each rail is recommended for noisy systems. Estimated: total quiescent current draw from Vref_A + Vref_B combined is in the single-digit µA range at no-load, so the translator does not meaningfully impact battery budget in portable designs. Both reference rails can be brought up in any order without latch-up damage.
The UQFN-12 exposed die-attach pad (DAP) at pin 12 must be soldered to a ground pad on the top layer for thermal dissipation and mechanical reliability. Without proper DAP soldering, the device can overheat or crack under reflow. Estimated: ground-pad area of at least 1 mm² with multiple thermal vias to the inner ground plane is recommended. Channel traces should be routed as 50 ohm microstrip where possible to preserve signal integrity at 50 MHz+ SPI speeds.
Pull-up resistors are REQUIRED on both sides for open-drain buses (I2C, SMBus, GPIO-with-OD); do not omit them even if the bus master has weak internal pull-ups. For push-pull signals (SPI, standard GPIO), pull-ups are not required but ensure both Vref rails are present before driving channels, otherwise the translator enters a high-impedance state and signals may float. Do not apply voltages to channel pins before Vref_A or Vref_B are powered - Ioff protection handles partial-power-down but sequencing in the wrong order can back-drive a powered-down rail.
For long PCB traces (>50 mm) or capacitive loads (>25 pF) on push-pull signals, the LSF0204's internal one-shot accelerators maintain clean rise/fall times at 100 MHz; however, avoid placing the translator too close to switching regulators or RF traces to prevent injected noise. For very high-speed buses (SDR SDIO at 200 MHz+, MIPI), the LSF0204 is not the right choice - use a dedicated fixed-direction translator like SN74AVC4T774 instead.
Informations de conformité
RoHS compliant and lead-free per TI product page; AEC-Q100 not specified for this part (industrial/consumer); halogen-free status not explicitly listed by TI for this part.
