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onsemi PACDN043-LF
- Part No.:
- PACDN043-LF
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
PACDN043-LF.pdf
- Description:
- ESD / SURGE PROTECTOR ARRAY
- Quantity:
- Payment:
- Shipping:
Inventory:3,482
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Product details
Overview
PACDN043-LF from onsemi is a 4-pin ESD protection diode array in SOT-143 package, designed for low-clamping-voltage transient suppression on exposed interface lines. It delivers ±20 kV IEC 61000-4-2 contact ESD protection, 5.5 V reverse stand-off voltage, and 30 pF capacitance at 2.5 VDC/1 MHz - enabling robust USB and serial port protection without signal integrity degradation.
For engineers reviewing the PACDN043-LF datasheet, pinout, applications, or equivalent options, key selection criteria include its 4-pin SOT-143 layout, ±30 kV HBM rating, low-leakage (1–100 nA at 5 V), clamping performance (6.2–8 V positive / −0.4 to −1.2 V negative), and compatibility with space-constrained PCB layouts requiring discrete ESD hardening.
Technical Context
The PACDN043-LF integrates three bidirectional ESD protection diodes sharing a common GND terminal in a 4-pin SOT-143 configuration. Its internal structure routes cathodes to pins 1, 2, and 4 while pin 3 serves as the shared anode (GND), enabling simultaneous protection of three independent signal lines against fast transients.
It operates across −40 °C to +85 °C and sustains 0.225 W power dissipation in SOT-143. The device meets IEC 61000-4-2 Level 4 (±8 kV contact) and exceeds it with ±20 kV contact discharge capability per pin - verified under standardized test conditions with all other channel pins open and GND pins grounded.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ESD Rating (IEC 61000-4-2) | ±20 kV contact discharge - protects exposed ports against worst-case human-hand ESD events without latch-up or degradation. |
| ESD Rating (HBM) | ±30 kV per MIL-STD-883D Method 3015 - ensures survivability during board handling and assembly. |
| Reverse Stand-off Voltage (VRSO) | 5.5 V min @ IR = 10 µA - blocks normal 5 V logic signals while triggering only during overvoltage transients. |
| Clamp Voltage (VSIG) | +6.2 to +8 V / −0.4 to −1.2 V @ ±10 mA - limits peak voltage seen by downstream ICs during ESD strikes. |
| Capacitance | 30 pF typ @ 2.5 VDC, 1 MHz - preserves signal integrity for USB 2.0 and UART up to ~480 Mbps without excessive loading. |
| Leakage Current (ILEAK) | 1–100 nA @ 5.0 VDC - avoids DC bias shift or power drain in high-impedance interface circuits. |
| Operating Temperature | −40 °C to +85 °C - supports industrial and consumer-grade embedded applications without derating. |
Pinout & Package
SOT-143 (Case 527AF), 4-lead surface-mount package measuring 2.90 mm × 1.30 mm × 0.90 mm with 1.92 mm pitch. Pb-free, RoHS-compliant, marked with device code and date code.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Protected signal line #1 - connects to I/O trace requiring ESD hardening (e.g., USB D+). |
| 2 | Cathode | Protected signal line #2 - connects to second I/O trace (e.g., USB D−). |
| 3 | GND | Common anode reference - must be connected to low-impedance system ground plane for effective clamping. |
| 4 | Cathode | Protected signal line #3 - supports third protected line (e.g., VBUS sense or sideband signal). |
Key Features
| Feature | Design Value |
|---|---|
| Triple-channel ESD protection | Three independent cathodes (pins 1, 2, 4) share one GND (pin 3), enabling compact protection of multi-line interfaces without extra components. |
| Low clamping voltage | Clamps to ≤8 V positive and ≥−1.2 V negative at 10 mA - keeps protected ICs within safe absolute maximum ratings during ESD events. |
| Ultra-low capacitance | 30 pF typical - minimizes signal distortion and timing skew on high-speed digital lines like USB 2.0 and RS-232. |
| Pb-free & RoHS compliant | Meets global environmental regulations and reflow soldering profiles (JEDEC J-STD-020), supporting lead-free manufacturing. |
| Space-efficient SOT-143 | 2.9 mm × 1.3 mm footprint - saves >40% board area vs. SOIC-8 alternatives while maintaining thermal performance. |
Applications
| USB 2.0 Port Protection | Industrial Serial Interface |
|---|---|
|
Use Scenario: Protecting USB D+, D−, and VBUS sense lines on host/device connectors exposed to frequent plugging/unplugging in factory environments. IC Role / Device Role / Timing Role: Transient voltage suppressor placed directly at connector entry point, clamping ESD pulses before they reach USB transceiver IC. Use Value: Prevents permanent damage to USB PHYs rated for only ±8 kV IEC ESD; enables compliance with IEC 61000-4-2 Level 4 without redesigning layout or adding TVS arrays. |
Use Scenario: Hardening RS-485/RS-232 transceiver pins on programmable logic controllers (PLCs) mounted in unshielded control cabinets. IC Role / Device Role / Timing Role: Low-capacitance shunt protector on differential data lines, triggered only during ESD events to avoid interfering with 10 Mbps signaling. Use Value: Maintains signal fidelity at 115.2 kbps while surviving ±20 kV contact discharges - eliminating field failures due to operator-induced ESD on terminal blocks. |
| Consumer Docking Station | Medical Diagnostic Interface |
|
Use Scenario: Securing proprietary high-speed docking ports on tablet accessories where multiple signal lines (data, power detect, ID) are routed through a single connector. IC Role / Device Role / Timing Role: Multi-cathode ESD clamp providing coordinated protection across three adjacent traces with shared ground return path. Use Value: Reduces BOM count by replacing three discrete 2-pin diodes with one 4-pin SOT-143 device - cutting placement cost and improving layout repeatability. |
Use Scenario: Safeguarding isolated CAN or UART pins on patient-monitor front panels subject to repeated electrostatic discharge from clinical staff gloves. IC Role / Device Role / Timing Role: First-line ESD barrier on microcontroller GPIOs connected to external diagnostic probes or sensor cables. Use Value: Ensures uninterrupted operation during IEC 60601-1-2 ESD immunity testing (±8 kV contact); prevents firmware lockups or false alarms caused by transient-induced MCU resets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPD2E001DRYR (Texas Instruments) | 3-pin SC70, dual-channel, 15 pF capacitance, 5.5 V VRWM, ±15 kV IEC contact | Limited to two protected lines; lower ESD rating; smaller footprint but no third cathode | Select when only two lines require protection and ultra-low capacitance (<15 pF) is critical for >1 Gbps interfaces. |
| SP1001-04UTG (Littelfuse) | 4-pin SOT-143, quad-channel, 12 pF, 5 V VRWM, ±15 kV IEC contact, integrated GND | Higher channel count but lower ESD rating and tighter voltage margin - less suitable for 5 V tolerant systems | Prefer for 3.3 V systems needing four-line protection; not recommended for 5 V USB where PACDN043-LF's 5.5 V VRSO provides safer margin. |
Compared with TPD2E001DRYR and SP1001-04UTG, PACDN043-LF uniquely balances triple-line coverage, ±20 kV ESD robustness, and 5.5 V stand-off in a standard SOT-143 - making it optimal for cost-sensitive 5 V interface designs where reliability trumps minimal capacitance.
Availability
PACDN043-LF is available at Aetrix Electronics and suitable for USB port hardening, industrial serial interface protection, and medical diagnostic equipment requiring stable component supply and long-term manufacturability.
Supply support for PACDN043-LF 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The PACDN043-LF belongs to onsemi's PACDNxx ESD protection family, engineered specifically for high-reliability, space-constrained interface protection - emphasizing low clamping, high ESD immunity, and seamless integration into high-volume PCB assemblies.
FAQ
What is the pin configuration of PACDN043-LF?
PACDN043-LF uses a 4-pin SOT-143 package with pins 1, 2, and 4 as individual cathodes for protected signal lines, and pin 3 as the common anode (GND). This configuration allows simultaneous protection of three independent I/O traces with a single ground connection, minimizing routing complexity and PCB area.
Does PACDN043-LF support USB 2.0 data rates?
Yes, PACDN043-LF supports USB 2.0 full-speed (12 Mbps) and high-speed (480 Mbps) operation. Its 30 pF typical capacitance at 1 MHz introduces negligible signal attenuation or jitter on differential pairs, and its low dynamic resistance (1.0 Ω forward, 1.4 Ω reverse) ensures rapid clamping without distorting eye diagrams during compliance testing.
What is the maximum operating temperature for PACDN043-LF?
PACDN043-LF is rated for continuous operation from −40 °C to +85 °C, as specified in Table 3 of the official datasheet. This range covers standard industrial and commercial ambient conditions, and the device maintains full ESD protection performance across this span without derating or thermal shutdown behavior.
How does PACDN043-LF compare to PACDN042-LF in terms of channel count and package?
PACDN043-LF is a 4-pin, triple-channel device in SOT-143, whereas PACDN042-LF is a 3-pin, dual-channel device in SOT-23-3 or SC70-3. The PACDN043-LF adds a third protected line and uses a slightly larger but still compact SOT-143 footprint - enabling denser multi-signal protection without increasing per-line component count.
Is PACDN043-LF RoHS compliant and lead-free?
Yes, PACDN043-LF is explicitly marked as Pb-free and RoHS compliant in the datasheet's Features section and Ordering Information table. It meets EU Directive 2011/65/EU and is compatible with standard lead-free reflow profiles per JEDEC J-STD-020, including peak temperatures up to 260 °C.
PACDN043-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- TO-253-4, TO-253AA
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 3
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 6.1V (Min)
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- 8V
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- USB
- Capacitance @ Frequency:
- 30pF @ 1MHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
PACDN043-LF FAQ
1.How can I place an order for PACDN043-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for PACDN043-LF 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 PACDN043-LF reliable?
The price and inventory of PACDN043-LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PACDN043-LF is usually 5 days.
3.What payment methods are accepted for PACDN043-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PACDN043-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PACDN043-LF?
PACDN043-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PACDN043-LF 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 PACDN043-LF?
For technical support, including PACDN043-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PACDN043-LF requirements.
6.How does Aetrix verify that PACDN043-LF is sourced from the original manufacturer or authorized distributors?
All PACDN043-LF 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 PACDN043-LF meets industry standards.
7.What is the process for return or replacement of PACDN043-LF?
All PACDN043-LF units undergo pre-shipment inspection (PSI). If there is an issue with PACDN043-LF, 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 PACDN043-LF part is unused and in its original packaging.
Return procedure for PACDN043-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PACDN043-LF 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
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D5V0L1B2WS-7
Diodes Incorporated
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