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Nexperia USA Inc. NXT4557GUX
- Part No.:
- NXT4557GUX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
NXT4557GUX.pdf
- Description:
- IC TRANSLATOR UNIDIR 10XQFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,945
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Product details
Overview
NXT4557GUX from Nexperia is a dedicated SIM card interface level translator with enable control, designed to bridge voltage domains between low-voltage host microcontrollers (1.08 V–1.98 V) and SIM/eSIM cards (1.62 V–3.3 V). It provides three independent level-shifted channels (I/O, RST, CLK), supports ISO-7816-3-compliant shutdown sequencing, and operates up to 25 MHz clock frequency and 5 Mbps data rate in push-pull mode.
For engineers reviewing the NXT4557GUX datasheet, NXT4557GUX pinout, NXT4557GUX application, or NXT4557GUX equivalent, key selection considerations include bidirectional I/O translation architecture, integrated EMI filtering on all SIM-side outputs, <1 μA shutdown current, UVLO-AC detection for robust VCC_SIM power-down response, and XQFN10 package compatibility with space-constrained mobile modules.
Technical Context
The NXT4557GUX implements a dual-domain, capacitance-isolated bidirectional I/O channel using active PMOS pull-up with one-shot acceleration for fast LOW-to-HIGH transitions, eliminating direction-control signals. Its unidirectional RST_HOST→RST_SIM and CLK_HOST→CLK_SIM paths feature matched propagation delay (≤12 ns typ) and ≤2 ns inter-channel skew.
Shutdown is initiated by either EN=LOW or VCC_SIM falling below Vdis(UVLO_AC) ≈ 0.86×VCC_SIM, triggering a deterministic 4 μs (typ) sequence: RST_SIM pulled LOW first, then CLK_SIM and IO_SIM sequentially via internal 400 Ω pull-down resistors - fully compliant with ISO/IEC 7816-3 hot-swap requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range (Host) | 1.08 V to 1.98 V - Enables direct interfacing with modern ultra-low-voltage application processors without external LDOs. |
| Supply Range (SIM) | 1.62 V to 3.3 V - Supports legacy 3 V, dual-voltage 1.8 V/3 V, and eSIM 1.8 V operation per ETSI/IMT-2000 standards. |
| Max Clock Frequency | 25 MHz - Meets Class-C SIM timing requirements and exceeds Class-B (5 MHz) and Class-A (1 MHz) specifications. |
| Shutdown Current | <1 μA - Minimizes battery drain during SIM card deactivation in always-on cellular IoT modules. |
| ESD Protection (SIM pins) | ±8 kV contact / ±15 kV air (IEC61000-4-2 Level 4) - Eliminates need for external TVS diodes on SIM interface lines. |
| Propagation Delay | 7–12 ns (typ) - Ensures timing margin for high-speed SIM communication with sub-40 ns total round-trip latency. |
| UVLO-AC Threshold | ≈0.86 × VCC_SIM - Fast, slope-dependent detection prevents false shutdown during transient VCC_SIM droop in mobile power systems. |
Pinout & Package
The NXT4557GUX is housed in a 1.40 mm × 1.80 mm × 0.50 mm XQFN10 (SOT1160-1) package with exposed thermal pad, optimized for high-density mobile PCB layouts and thermal performance in compact SIM trays.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST_HOST | Input | Host-side reset signal input; translated to RST_SIM with 7–12 ns delay and ISO-7816-3 shutdown coordination. |
| 2 - CLK_HOST | Input | Host-side clock input; drives CLK_SIM with matched timing and integrated EMI filtering to suppress RF interference. |
| 3 - IO_HOST | Bidirectional I/O | Host data line with automatic direction sensing; supports push-pull and open-drain drivers without external control logic. |
| 4 - VCC_SIM | Power | SIM-side supply input (1.62–3.3 V); powers SIM-side translators and triggers UVLO-AC shutdown when falling below threshold. |
| 5 - IO_SIM | Bidirectional I/O | SIM data line with integrated 4.3 kΩ pull-up and 400 Ω pull-down; enables hot-swap-safe bidirectional communication. |
| 6 - CLK_SIM | Output | SIM clock output; actively driven with 10 ns max transition time and EMI filter to meet mobile RF emission limits. |
| 7 - RST_SIM | Output | SIM reset output; first signal pulled LOW in shutdown sequence to prevent SIM state corruption during power loss. |
| 8 - GND | Ground | Common reference for both domains; requires low-inductance layout to maintain ESD immunity and signal integrity. |
| 9 - VCC_HOST | Power | Host-side supply input (1.08–1.98 V); powers host-side interfaces and enables internal pull-ups on IO_HOST/IO_SIM. |
| 10 - EN | Input | Active-HIGH enable; initiates full ISO-7816-3 shutdown sequence on falling edge, including RST/CLK/IO deactivation. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic bidirectional I/O translation | No direction-control pin required; internal logic detects first falling edge to dynamically assign drive authority between host and SIM sides. |
| ISO-7816-3 compliant shutdown | Deterministic 4 μs (typ) sequence (RST→CLK→IO) using internal 400 Ω pull-downs ensures safe SIM card power removal during hot swap. |
| Integrated EMI filters | 44 Ω series resistance on CLK_SIM/RST_SIM/IO_SIM outputs suppresses harmonics above 500 MHz, easing RF coexistence in LTE/NB-IoT modules. |
| UVLO-AC detection | High-slope-sensitive disable threshold (~0.86×VCC_SIM) prevents spurious shutdown during brief VCC_SIM dips common in battery-powered devices. |
| Robust ESD protection | ±8 kV contact / ±15 kV air on all SIM pins eliminates need for external protection, reducing BOM count and PCB area. |
Applications
| Mobile Handsets | Wireless Modems |
|---|---|
|
Use Scenario: Dual-SIM smartphone supporting 1.8 V eSIM and legacy 3 V SIM in shared socket. IC Role / Device Role / Timing Role: Voltage domain translator enabling simultaneous host processor (1.2 V I/O) to manage two SIM voltages without level-shifting discretes. Use Value: Reduces component count by 6+ discrete MOSFETs/resistors per SIM path while guaranteeing ISO-7816-3 shutdown compliance during SIM switching. |
Use Scenario: LTE Cat-M1 modem module with embedded eSIM requiring low-power sleep mode. IC Role / Device Role / Timing Role: SIM interface controller that enters <1 μA shutdown on EN=LOW, cutting SIM leakage current during deep sleep. Use Value: Extends battery life in asset trackers by eliminating SIM-side quiescent current during 99% of idle time without compromising hot-swap safety. |
| SIM Card Terminals | IoT Cellular Gateways |
|
Use Scenario: Payment terminal with removable SIM tray supporting field upgrades and hot insertion. IC Role / Device Role / Timing Role: Hot-swap enabler translating between 1.8 V host MCU and 3 V SIM, with deterministic shutdown on tray removal. Use Value: Prevents SIM memory corruption during mechanical disconnection by enforcing RST-first deactivation per ISO-7816-3 within 4 μs. |
Use Scenario: Industrial gateway with failover SIM for backup cellular connectivity. IC Role / Device Role / Timing Role: Reliable SIM interface with ESD-hardened pins (±15 kV air) surviving harsh ESD events in factory environments. Use Value: Eliminates field failures from operator-induced ESD on SIM slots, avoiding costly service calls and firmware reflash cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SIM card interface translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NX3P2557GU | Single-supply (VCC only), no EN pin, fixed 1.8 V SIM support only; lacks UVLO-AC and ISO-7816-3 shutdown. | Restricted to fixed-voltage 1.8 V SIM designs without hot-swap or multi-voltage support. | Select only if system uses only 1.8 V SIM and does not require controlled shutdown or VCC_SIM monitoring. |
| MAX14777 | 3.3 V host side only; no sub-1.2 V support; higher 5 μA shutdown current; no integrated EMI filters on outputs. | Requires external level shifters for sub-1.2 V hosts and additional EMI suppression components. | Choose only for legacy 3.3 V host designs where PCB area and ESD robustness are secondary concerns. |
Compared with NX3P2557GU and MAX14777, the NXT4557GUX uniquely delivers dual-voltage SIM support (1.62–3.3 V), sub-1.2 V host compatibility, ISO-7816-3–compliant shutdown, and integrated EMI filtering - making it the only solution meeting full ETSI/IMT-2000 requirements in ultra-compact XQFN10 packaging.
Availability
NXT4557GUX is available at Aetrix Electronics and suitable for mobile handsets, wireless modems, SIM card terminals, and IoT cellular gateways requiring stable component supply across automotive-grade temperature range (-40 °C to +85 °C).
Supply support for NXT4557GUX 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
Nexperia is a global semiconductor expert delivering high-performance, reliable, and energy-efficient components for automotive, industrial, and consumer electronics markets.
The NXT4557GUX belongs to Nexperia's SIM interface solutions product line, engineered specifically to simplify secure, standards-compliant SIM/eSIM integration in space- and power-constrained portable and IoT devices.
FAQ
What is the minimum VCC_HOST voltage supported by NXT4557GUX?
The NXT4557GUX supports VCC_HOST as low as 1.08 V, enabling direct connection to advanced application processors and microcontrollers operating at ultra-low core voltages. This eliminates the need for intermediate voltage translation stages and reduces system power consumption in battery-powered devices.
How does the UVLO-AC feature improve reliability compared to standard UVLO?
UVLO-AC uses a high-slope detection circuit that triggers shutdown only when VCC_SIM falls rapidly (≥0.9 V/ms), preventing false shutdown during benign slow droops caused by load transients. Standard UVLO (Ven/Vdis) responds to absolute voltage thresholds regardless of slew rate, increasing risk of unintended deactivation in noisy power environments.
Can NXT4557GUX interface with both 1.8 V and 3.0 V SIM cards on the same design?
Yes - the device supports VCC_SIM from 1.62 V to 3.3 V and automatically adapts translation thresholds. A single NXT4557GUX design can accommodate interchangeable 1.8 V eSIMs and legacy 3 V SIM cards without hardware changes, simplifying inventory and enabling universal SIM socket designs.
Is external decoupling required for stable operation?
Yes - a 100 nF ceramic capacitor must be placed as close as possible to both VCC_HOST (pin 9) and VCC_SIM (pin 4), per Figure 9 in the datasheet. This ensures low-impedance local energy storage for fast transient current demands during level transitions and maintains ESD immunity performance.
NXT4557GUX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Translator Type:
- Voltage Level
- Channel Type:
- Unidirectional
- Number of Circuits:
- 1
- Channels per Circuit:
- 3
- Voltage - VCCA:
- 1.08 V ~ 1.98 V
- Voltage - VCCB:
- 1.62 V ~ 3.3 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Non-Inverted
- Data Rate:
- 5Mbps
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-XFQFN
NXT4557GUX FAQ
1.How can I place an order for NXT4557GUX through Aetrix?
Please submit a Request for Quotation (RFQ) for NXT4557GUX 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 NXT4557GUX reliable?
The price and inventory of NXT4557GUX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NXT4557GUX is usually 5 days.
3.What payment methods are accepted for NXT4557GUX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NXT4557GUX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NXT4557GUX?
NXT4557GUX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NXT4557GUX 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 NXT4557GUX?
For technical support, including NXT4557GUX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NXT4557GUX requirements.
6.How does Aetrix verify that NXT4557GUX is sourced from the original manufacturer or authorized distributors?
All NXT4557GUX 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 NXT4557GUX meets industry standards.
7.What is the process for return or replacement of NXT4557GUX?
All NXT4557GUX units undergo pre-shipment inspection (PSI). If there is an issue with NXT4557GUX, 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 NXT4557GUX part is unused and in its original packaging.
Return procedure for NXT4557GUX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
NXT4557GUX Tags
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