My Inquiry
My Account
Semtech Corporation RCLAMP1591P.L
- Part No.:
- RCLAMP1591P.L
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- 4-UDFN
- Datasheet:
-
RCLAMP1591P.L.pdf
- Description:
- TVS DIODE 15VWM 33VC 4QFN
- Quantity:
- Payment:
- Shipping:
Inventory:429,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
RClamp1591P.L from Semtech is a low-capacitance, non-magnetic ESD protection diode designed for high-speed bidirectional data lines in MRI and diagnostic imaging environments. It provides ±30kV IEC 61000-4-2 ESD immunity, 20A IEC 61000-4-5 surge capability, 3pF max junction capacitance, ±15V working voltage, and clamps to ≤33V at 20A.
For engineers reviewing the RClamp1591P.L datasheet, pinout, applications, or equivalent options, this device is selected for board-level ESD/EOS protection on sensitive high-speed interfaces where magnetic compatibility, fast response, and minimal signal distortion are critical design requirements.
Technical Context
The RClamp1591P.L employs silicon-avalanche technology to achieve sub-nanosecond response time and low dynamic resistance (0.20Ω), enabling effective transient suppression without signal integrity degradation. Its bidirectional architecture protects a single data line with symmetrical clamping behavior under both positive and negative transients.
Designed specifically for magnetic resonance imaging (MRI) systems, the device uses non-magnetic materials and packaging to avoid interference with static and gradient magnetic fields. Its QFN 2.9×2.5×0.55mm 4-lead package matches SOT-143 land patterns, supporting drop-in replacement in existing layouts without redesign.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ESD Withstand Voltage | ±30kV air/contact per IEC 61000-4-2 - ensures robust immunity against human-body-model and contact-discharge events in clinical and industrial settings. |
| Peak Pulse Current | 20A (8/20μs waveform) - handles high-energy surges from lightning-induced or inductive switching transients on communication lines. |
| Junction Capacitance | Max 3pF at 0V, 1MHz - preserves signal integrity on USB 2.0, RS-485, and Ethernet interfaces up to ~480 Mbps without measurable rise-time degradation. |
| Clamping Voltage | ≤33V at 20A (8/20μs) - limits voltage seen by downstream ICs to safe levels during surge events, protecting transceivers and PHYs. |
| Working Voltage | ±15V - supports full-duplex operation on standard industrial serial buses including RS-232 and RS-485 with common-mode margins. |
| Dynamic Resistance | 0.20Ω (TLP, 4A→16A) - enables rapid voltage stabilization during fast transients, reducing energy dissipation and thermal stress. |
Pinout & Package
Package: QFN 2.9 × 2.5 × 0.55 mm, 4-lead, Pb-free, RoHS/WEEE compliant. Interchangeable with SOT-143 footprint and pinout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode of Channel 1 | Connects to protected data line (e.g., USB D+ or RS-485 A); forms one side of bidirectional ESD path. |
| Pin 2 | Cathode of Channel 1 / Anode of Channel 2 | Common terminal between two internal avalanche diodes; connects to system ground or reference plane. |
| Pin 3 | Cathode of Channel 2 | Connects to same protected data line as Pin 1; completes symmetrical bidirectional clamping path. |
| Pin 4 | Exposed Thermal Pad | Internally connected to ground; must be soldered to PCB ground plane for optimal thermal dissipation and ESD return path. |
Key Features
| Feature | Design Value |
|---|---|
| Non-magnetic construction | Enables safe deployment inside MRI scanner rooms and near gradient coils without distorting magnetic fields or triggering safety interlocks. |
| Low 3pF capacitance | Minimizes insertion loss and phase shift on high-speed differential pairs, maintaining eye diagram integrity for USB 2.0 and 10/100BASE-TX. |
| Symmetrical bidirectional clamping | Provides identical protection for positive and negative transients-critical for AC-coupled or differential signaling like RS-485 and Ethernet PHYs. |
| QFN–SOT-143 footprint compatibility | Allows direct replacement in legacy designs using SOT-143 packages without PCB rework or layout changes. |
Applications
| MRI Diagnostic Imaging Systems | Industrial RS-485 Networks |
|---|---|
Use Scenario: Protecting sensor interface lines inside MRI gantry cabinets exposed to strong static and pulsed magnetic fields. IC Role / Device Role / Timing Role: ESD/EOS protector on bidirectional serial control lines connecting gradient coil drivers and real-time monitoring modules. Use Value: Non-magnetic QFN package prevents field distortion; ±30kV ESD rating withstands electrostatic discharge during technician handling and maintenance. | Use Scenario: Shielding long-haul RS-485 bus nodes in factory automation against induced surges from motor drives and relay switching. IC Role / Device Role / Timing Role: Board-level transient suppressor placed at transceiver I/O pins to clamp line-to-ground surges before they reach the PHY. Use Value: 20A surge rating and ≤33V clamping protect isolated RS-485 transceivers; 3pF capacitance avoids signal jitter on 10 Mbps links. |
| USB 2.0 Peripheral Ports | RS-232 Medical Device Interfaces |
Use Scenario: Safeguarding USB D+/D− lines on portable diagnostic equipment connected to host PCs in hospital environments. IC Role / Device Role / Timing Role: Low-capacitance ESD shunt placed immediately before the USB connector to divert contact discharge away from the USB controller. Use Value: 3pF max capacitance preserves USB 2.0 eye margin; ±30kV air discharge rating exceeds IEC 61000-4-2 Level 4 requirements. | Use Scenario: Protecting RS-232 TX/RX lines on patient monitors and infusion pumps interfacing with central nursing stations. IC Role / Device Role / Timing Role: Bidirectional clamping diode on each signal line to suppress ESD from cable hot-plug and nearby electrostatic sources. Use Value: ±15V working voltage accommodates RS-232's ±12V signaling range; low leakage (<1μA) prevents DC bias shift on idle lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SP1003-01FTG | Higher capacitance (5.5pF max), lower surge rating (12A), same QFN-4 package but different pinout (Pin 2 = GND, Pin 3 = I/O). | Not suitable for MRI due to magnetic materials; better suited for cost-sensitive consumer USB ports where 5.5pF is acceptable. | Select only if non-magnetic requirement is absent and layout allows pinout adaptation. |
| TPD2E001DRYR | Lower ESD rating (±8kV contact), 3.5pF capacitance, dual-channel configuration (2 lines), different QFN-6 package. | Designed for handheld electronics; lacks MRI qualification and 20A surge capability required for industrial/medical infrastructure. | Consider only for space-constrained dual-line protection where MRI compliance and high-surge immunity are not needed. |
Compared with SP1003-01FTG and TPD2E001DRYR, the RClamp1591P.L uniquely combines MRI-grade non-magnetic construction, ±30kV ESD, 20A surge, and 3pF capacitance in a SOT-143-compatible QFN-4 package-making it the only option qualified for high-reliability medical imaging and industrial serial interfaces demanding all four attributes.
Availability
RClamp1591P.L is available at Aetrix Electronics and suitable for MRI diagnostic systems, industrial RS-485 networks, and medical USB 2.0 peripheral interfaces requiring stable component supply across long-lifecycle healthcare and industrial programs.
Supply support for RClamp1591P.L 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
Semtech Corporation is a U.S.-based fabless semiconductor company specializing in analog and mixed-signal ICs for precision sensing, protection, and signal integrity.
The RClamp® product line is engineered for board-level transient protection in high-speed, high-reliability applications-including medical imaging, industrial communications, and automotive infotainment-where ESD robustness, low capacitance, and environmental compliance are mandatory.
FAQ
What is the maximum junction capacitance of RClamp1591P.L and why does it matter for high-speed interfaces?
The RClamp1591P.L has a maximum junction capacitance of 3pF at 0V and 1MHz. This low value minimizes signal attenuation and timing skew on high-speed data lines such as USB 2.0 and RS-485, preserving eye diagram integrity and ensuring reliable bit-error-rate performance. Higher capacitance would degrade rise/fall times and increase intersymbol interference.
Is RClamp1591P.L certified for use in MRI environments, and what makes it suitable?
Yes, RClamp1591P.L is explicitly designed for MRI applications. Its non-magnetic packaging and internal materials prevent distortion of static and gradient magnetic fields, avoiding image artifacts or safety system faults. The datasheet confirms non-magnetic construction as a core feature, distinguishing it from standard ESD diodes that contain ferromagnetic elements.
What is the clamping voltage of RClamp1591P.L at 20A surge current, and how does it protect downstream ICs?
The RClamp1591P.L clamps to ≤33V at 20A (8/20μs waveform). This limits the peak voltage imposed on connected transceivers or PHYs during surge events, keeping stress below absolute maximum ratings. For example, an RS-485 transceiver rated for ±25V common-mode range remains within safe operating limits when protected by RClamp1591P.L.
Does RClamp1591P.L support bidirectional signal lines, and how is that implemented?
Yes, RClamp1591P.L provides symmetrical bidirectional clamping via an internal back-to-back diode configuration. Pins 1 and 3 connect to the protected line, while Pin 2 serves as the common cathode/anode node tied to ground. This architecture ensures identical clamping behavior for both polarities-essential for AC-coupled or differential protocols like RS-485 and USB.
What package type and footprint does RClamp1591P.L use, and is it compatible with existing SOT-143 layouts?
RClamp1591P.L uses a QFN 2.9 × 2.5 × 0.55 mm 4-lead package with identical pinout and land pattern to SOT-143. The datasheet explicitly states "interchangeable with SOT-143 for effortless drop-in replacement," allowing direct substitution without PCB redesign-critical for upgrading legacy medical or industrial designs to meet modern ESD standards.
RCLAMP1591P.L Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- 4-UDFN
- Series:
- RailClamp®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 15V (Max)
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 33V
- Current - Peak Pulse (10/1000µs):
- 20A (8/20µs)
- Power - Peak Pulse:
- 660W
- Power Line Protection:
- No
- Applications:
- Ethernet, USB
- Capacitance @ Frequency:
- 3pF @ 1MHz (Max)
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-QFN (2.9x2.5)
RCLAMP1591P.L FAQ
1.How can I place an order for RCLAMP1591P.L through Aetrix?
Please submit a Request for Quotation (RFQ) for RCLAMP1591P.L 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 RCLAMP1591P.L reliable?
The price and inventory of RCLAMP1591P.L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RCLAMP1591P.L is usually 5 days.
3.What payment methods are accepted for RCLAMP1591P.L?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RCLAMP1591P.L transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RCLAMP1591P.L?
RCLAMP1591P.L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RCLAMP1591P.L 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 RCLAMP1591P.L?
For technical support, including RCLAMP1591P.L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RCLAMP1591P.L requirements.
6.How does Aetrix verify that RCLAMP1591P.L is sourced from the original manufacturer or authorized distributors?
All RCLAMP1591P.L 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 RCLAMP1591P.L meets industry standards.
7.What is the process for return or replacement of RCLAMP1591P.L?
All RCLAMP1591P.L units undergo pre-shipment inspection (PSI). If there is an issue with RCLAMP1591P.L, 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 RCLAMP1591P.L part is unused and in its original packaging.
Return procedure for RCLAMP1591P.L:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RCLAMP1591P.L Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
