My Inquiry
My Account
onsemi PACDN044TR
- Part No.:
- PACDN044TR
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
PACDN044TR.pdf
- Description:
- TVS DIODE 5.5VWM 8VC 8-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:9,519
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
PACDN044TR from onsemi is an ESD protection diode array in TSSOP-8 package, providing ±20 kV IEC 61000-4-2 contact discharge protection and ±30 kV HBM ESD immunity per pin. It features low clamping voltage (6.2–8 V positive, −0.4 to −1.2 V negative at 10 mA), 30 pF capacitance at 2.5 V/1 MHz, and 5.5–6.1 V reverse stand-off voltage - designed for high-speed USB 2.0 and IEEE 1394 interface port protection.
For engineers reviewing the PACDN044TR datasheet, pinout, applications, or equivalent options, key selection criteria include multi-channel ESD clamping performance, low capacitance for signal integrity, GND-referenced cathode architecture, and compatibility with space-constrained board layouts requiring 0.65 mm pitch surface-mount packages.
Technical Context
The PACDN044TR implements a multi-diode array with all cathodes connected to protected signal lines and all anodes tied to common GND - enabling simultaneous bidirectional clamping of up to four independent data lines. Its design targets transient suppression during ESD events without affecting DC bias or high-frequency signal transmission.
Each channel delivers defined clamping behavior under both positive and negative transients, with dynamic resistance of 1.0 Ω (forward) and 1.4 Ω (reverse), ensuring predictable voltage limiting across IEC and MIL-STD-883 test conditions. The device operates over −40 °C to +85 °C and supports Pb-free reflow soldering per JEDEC J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ESD Rating (IEC 61000-4-2) | ±20 kV contact discharge - protects exposed ports against real-world electrostatic events without latch-up or degradation. |
| ESD Rating (HBM) | ±30 kV - exceeds standard IC-level human-body model requirements for robustness during handling and assembly. |
| Clamp Voltage (Positive) | 6.2–8 V at 10 mA - limits peak voltage seen by downstream ICs during fast transients, preserving logic-level integrity. |
| Clamp Voltage (Negative) | −0.4 to −1.2 V at −10 mA - prevents negative overshoot from damaging CMOS inputs or causing false triggering. |
| Capacitance | 30 pF at 2.5 VDC / 1 MHz - low enough to avoid signal distortion in USB 2.0 (480 Mbps) and FireWire applications. |
| Reverse Stand-off Voltage | 5.5–6.1 V - ensures no conduction during normal 5 V bus operation while maintaining margin before clamping onset. |
| Operating Temperature | −40 °C to +85 °C - supports industrial and consumer equipment deployment without derating. |
Pinout & Package
TSSOP-8 package (Case 948AL), 4.4 mm × 3.0 mm × 0.9 mm body, 0.65 mm lead pitch, Pb-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (Channel 1) | Protected signal line input - connects directly to USB D+ or other high-speed data trace. |
| 2 | GND | Common anode reference - must be low-inductance connection to system ground plane for effective clamping. |
| 3 | Cathode (Channel 2) | Second protected signal line - used for USB D−, differential pair partner to Pin 1. |
| 4 | GND | Secondary ground terminal - improves current sharing and reduces ground bounce during multi-pin ESD events. |
| 5 | GND | Third ground terminal - enhances thermal dissipation and low-impedance return path for surge currents. |
| 6 | Cathode (Channel 3) | Third protected line - supports additional interface such as VBUS sense or auxiliary control signal. |
| 7 | GND | Fourth ground terminal - provides symmetrical layout support and minimizes package inductance. |
| 8 | Cathode (Channel 4) | Fourth protected line - enables full-port protection for quad-signal interfaces like proprietary docking connectors. |
Key Features
| Feature | Design Value |
|---|---|
| Four-channel ESD protection | Single TSSOP-8 package safeguards four independent signal lines - eliminates need for discrete diodes and saves >60% board area vs. SOT-23 solutions. |
| Low clamping voltage asymmetry | Positive clamp ≤8 V and negative clamp ≥−1.2 V ensure balanced transient suppression - critical for bidirectional data lines. |
| Controlled 30 pF capacitance | Minimizes insertion loss and reflection in 480 Mbps USB 2.0 channels - maintains eye diagram integrity without equalization. |
| Multi-GND architecture | Four dedicated GND pins reduce ground loop inductance - improves clamping response time and energy handling consistency. |
| Pb-free & RoHS compliance | Meets global environmental regulations and supports lead-free reflow profiles up to 260 °C peak temperature. |
Applications
| USB 2.0 Port Protection | IEEE 1394 (FireWire) Interface |
|---|---|
|
Use Scenario: Protecting host controller USB D+/D− lines and VBUS detection circuitry from user-handling ESD events. IC Role / Device Role / Timing Role: Transient voltage suppressor placed between connector and PHY - operates passively during normal signaling, activates only during ESD. Use Value: Prevents permanent damage to USB transceivers and avoids system lockup or enumeration failure after ±8 kV contact discharge. |
Use Scenario: Shielding FireWire 400/800 data pairs (TPA/TPB) and power lines in digital camcorders and audio interfaces. IC Role / Device Role / Timing Role: Low-capacitance shunt protector on differential signaling paths - preserves signal rise/fall times below 1 ns. Use Value: Maintains 400 Mbps data integrity while surviving repeated ±15 kV air discharge events typical in studio environments. |
| Docking Station Data Lines | Industrial Control Panel Interfaces |
|
Use Scenario: Securing proprietary high-density docking connectors with mixed signal types (USB, UART, I²C, GPIO). IC Role / Device Role / Timing Role: Multi-line ESD guard for unshielded, frequently mated connectors - handles simultaneous multi-pin discharges. Use Value: Enables reliable hot-plug operation across 10,000+ mating cycles without performance drift or leakage increase. |
Use Scenario: Protecting front-panel buttons, LED indicators, and serial debug ports on factory HMIs exposed to maintenance personnel. IC Role / Device Role / Timing Role: Robust interface shield rated for harsh industrial ESD environments - withstands ±20 kV contact per IEC 61000-4-2 Level 4. Use Value: Eliminates field returns due to ESD-induced firmware crashes or display corruption in CE-marked equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SP3205-01UTG | SC-70-6 package, 3-channel, 12 pF capacitance, 5.5 V stand-off, ±15 kV IEC rating | Better suited for ultra-low-capacitance USB 3.0 Gen1 (5 Gbps) but lower ESD rating and fewer protected lines | Select when signal bandwidth >1 GHz is required and four-line protection is not needed. |
| TPD2E001DRSR | SON-6 package, dual-channel, 11 pF, 5 V stand-off, ±8 kV IEC rating | Optimized for cost-sensitive single-interface designs with lower ESD threat exposure | Choose for basic USB Type-A ports where ±8 kV IEC compliance suffices and board space is extremely limited. |
Compared with SP3205-01UTG and TPD2E001DRSR, the PACDN044TR offers higher ESD immunity (±20 kV), four-channel integration, and proven performance in multi-pin discharge scenarios - making it preferable for mission-critical docking and industrial interface protection despite its higher capacitance.
Availability
PACDN044TR is available at Aetrix Electronics and suitable for USB 2.0 port protection, IEEE 1394 interface hardening, and industrial docking station designs requiring stable component supply and long-term manufacturability assurance.
Supply support for PACDN044TR 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 management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The PACDN044TR belongs to onsemi's PACDNxx family of integrated ESD protection arrays, engineered specifically for high-reliability interface protection in space-constrained, high-speed digital systems.
FAQ
What is the primary function of the PACDN044TR?
The PACDN044TR is a four-channel ESD protection diode array designed to safeguard sensitive signal lines from electrostatic discharge. It clamps transient voltages using grounded-anode diodes, with each cathode connected to a protected line. The PACDN044TR delivers ±20 kV IEC 61000-4-2 contact discharge protection and maintains low 30 pF capacitance for high-speed data integrity - making it ideal for USB 2.0 and FireWire interfaces.
Which package type does the PACDN044TR use?
The PACDN044TR uses the TSSOP-8 package (Case 948AL), measuring 4.4 mm × 3.0 mm × 0.9 mm with 0.65 mm lead pitch. This compact, surface-mount package contains four cathode terminals (Pins 1, 3, 6, 8) and four dedicated GND terminals (Pins 2, 4, 5, 7), enabling low-inductance surge current paths. The PACDN044TR is Pb-free and RoHS compliant, qualified for standard lead-free reflow processes.
Does the PACDN044TR support bidirectional ESD protection?
Yes, the PACDN044TR provides true bidirectional ESD protection per channel. Its internal diode configuration allows clamping of both positive transients (6.2–8 V at 10 mA) and negative transients (−0.4 to −1.2 V at −10 mA). This dual-polarity response ensures protection for CMOS inputs regardless of ESD polarity - a requirement confirmed in the PACDN044TR datasheet Table 4 under VSIG parameter definitions.
What is the maximum operating temperature range for the PACDN044TR?
The PACDN044TR is rated for continuous operation from −40 °C to +85 °C, as specified in Table 3 of its datasheet under Standard Operating Conditions. This range supports deployment in industrial control panels, automotive infotainment docks, and consumer electronics without thermal derating. The PACDN044TR's silicon structure and packaging maintain stable leakage current (<100 nA at 5 V) and clamping performance across this full span.
Is the PACDN044TR still in active production?
No, the PACDN044TR is marked as discontinued per the official onsemi datasheet revision 9 (September 2025), which explicitly lists "PACDN044TR" in the Discontinued OPNs table on page 5. While Aetrix Electronics maintains legacy inventory and supports existing designs, new designs should consider alternatives such as SP3205-01UTG or TPD2E001DRSR - and the PACDN044TR's discontinuation status must be factored into long-term BOM planning.
PACDN044TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 4
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 5.5V
- Voltage - Breakdown (Min):
- 6.2V
- Voltage - Clamping (Max) @ Ipp:
- 8V
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
PACDN044TR FAQ
1.How can I place an order for PACDN044TR through Aetrix?
Please submit a Request for Quotation (RFQ) for PACDN044TR 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 PACDN044TR reliable?
The price and inventory of PACDN044TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PACDN044TR is usually 5 days.
3.What payment methods are accepted for PACDN044TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PACDN044TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PACDN044TR?
PACDN044TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PACDN044TR 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 PACDN044TR?
For technical support, including PACDN044TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PACDN044TR requirements.
6.How does Aetrix verify that PACDN044TR is sourced from the original manufacturer or authorized distributors?
All PACDN044TR 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 PACDN044TR meets industry standards.
7.What is the process for return or replacement of PACDN044TR?
All PACDN044TR units undergo pre-shipment inspection (PSI). If there is an issue with PACDN044TR, 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 PACDN044TR part is unused and in its original packaging.
Return procedure for PACDN044TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PACDN044TR 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
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 …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
