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onsemi SRDA05-4R2G
- Part No.:
- SRDA05-4R2G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SRDA05-4R2G.pdf
- Description:
- TVS DIODE 5VWM 12VC 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:24,994
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Product details
Overview
SRDA05-4R2G from onsemi is a unidirectional, low-capacitance ESD protection diode array in SO-8 package, designed to protect four high-speed data lines (pins 1, 4, 6, 7) against IEC 61000-4-2 (±15 kV air / ±8 kV contact), IEC 61000-4-4 (40 A EFT), and IEC 61000-4-5 (23 A lightning) transients. It features 6 V working peak reverse voltage, ≤9.8 V clamping at 1 A, and 5–8 pF inter-I/O capacitance - enabling use in USB 2.0, Ethernet 10/100, and T1/E1 interfaces.
For engineers reviewing the SRDA05-4R2G datasheet, pinout, applications, or equivalent options, this device delivers verified transient suppression for multi-line I/O protection with minimal signal distortion, validated layout guidance for ground inductance control, and explicit configuration options for VCC-referenced, resistor-isolated, or self-referenced operation.
Technical Context
The SRDA05-4R2G integrates four steering diodes and one common surge protection diode in a single SO-8 package. Its unidirectional architecture requires external reference connection (VCC or GND) at pins 2/3 and 5/8 to establish clamping thresholds - VC = VF + VRWM for negative transients and VC = VCC + VF for positive transients when referenced to supply rail.
Clamping performance is defined by 500 W peak power (8 × 20 µs), 12 V max clamping at 10 A, and temperature-stable breakdown (6.0 V min @ 1 mA). The internal structure supports three distinct configurations: direct VCC bias (Option 1), 10 kΩ isolation resistor (Option 2), or internal surge diode as reference (Option 3), each with documented PCB trace length and grounding requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Device Type | Unidirectional ESD protection diode array - requires external reference for clamping polarity definition |
| Working Peak Reverse Voltage (VRWM) | 5.0 V - sets maximum steady-state voltage before conduction; defines lower bound of protected line operating range |
| Breakdown Voltage (VBR) | 6.0 V min @ 1 mA - ensures reliable turn-on during ESD events while avoiding false triggering under normal operation |
| Max Clamping Voltage (VC) | 9.8 V @ 1 A, 8 × 20 µs - limits transient voltage seen by downstream ICs to safe levels during low-energy ESD |
| Inter-I/O Capacitance | 5–8 pF @ 0 V, 1 MHz - enables <100 Mbps data integrity in USB 2.0 and 10/100 Ethernet without signal degradation |
| ESD Rating | IEC 61000-4-2: ±15 kV air / ±8 kV contact - exceeds industrial immunity requirements for handheld and peripheral ports |
| Peak Pulse Power | 500 W @ 8 × 20 µs - sustains high-energy lightning surges without thermal failure or parameter shift |
Pinout & Package
SRDA05-4R2G is housed in an SOIC-8 (Case 751-07) package measuring 4.80–5.00 mm × 3.80–4.00 mm × 1.35–1.75 mm, with Pb-free finish and 260 °C soldering tolerance. Pin 1 marking is indicated by a beveled corner or microdot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 6, 7 | I/O Line Terminals | Protected data lines - each connects to one high-speed interface (e.g., USB D+, D−, Ethernet TX+/RX+) |
| 2, 3 | Positive Reference Input | VCC connection point for Option 1/2; left open in Option 3 to enable self-referenced clamping |
| 5, 8 | Negative Reference Terminal | Must connect directly to low-inductance ground plane - critical for minimizing clamping voltage overshoot |
| Internal Node | Common Cathode Surge Diode | Routes transient current from all I/O pins to reference rails - forms core of integrated protection topology |
Key Features
| Feature | Design Value |
|---|---|
| Four-channel integrated protection | Single SO-8 package replaces four discrete diodes plus TVS - reduces PCB area by >60% vs. discrete solutions |
| Configurable reference topology | Three validated layouts (VCC-biased, resistor-isolated, self-referenced) allow optimization for noise, power isolation, or supply absence |
| Low inter-I/O capacitance | 5–8 pF enables full-speed USB 2.0 (480 Mbps) and 100BASE-TX Ethernet without eye diagram degradation |
| Controlled clamping dynamics | VC = VF + VRWM or VC = VCC + VF provides predictable voltage limiting independent of transient rise time |
| Ground inductance mitigation | Dedicated low-inductance ground pins (5, 8) with strict PCB layout guidance reduce V = L·di/dt overshoot during sub-ns ESD events |
Applications
| USB 2.0 Port Protection | Ethernet 10/100 Interface |
|---|---|
|
Use Scenario: Protecting upstream/downstream USB ports on host controllers and peripherals against user-handling ESD. IC Role / Device Role / Timing Role: ESD transient shunt - routes ±8 kV contact discharges away from USB PHY transceivers via low-inductance path to GND/VCC. Use Value: Maintains signal integrity with ≤8 pF capacitance across D+/D− pair, preventing bit errors at 480 Mbps while meeting IEC 61000-4-2 Level 4. |
Use Scenario: Shielding Ethernet PHY differential pairs (TX+/TX−, RX+/RX−) from cable-coupled ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Common-mode transient suppressor - clamps both lines simultaneously to VCC or GND using matched steering diodes. Use Value: Enables robust 100BASE-TX operation with <1 ns response time and 12 V clamping at 10 A, preserving Ethernet auto-negotiation timing. |
| T1/E1 Line Interface | Industrial Serial Communication |
|
Use Scenario: Safeguarding telecom line drivers/receivers (e.g., TI/E1 trancievers) connected to long-distance twisted-pair cables. IC Role / Device Role / Timing Role: High-energy surge diverter - absorbs 23 A (8/20 µs) lightning surges per IEC 61000-4-5 without latch-up or parametric shift. Use Value: Delivers 500 W peak power handling in compact SO-8 footprint, eliminating need for bulky discrete MOVs or gas discharge tubes. |
Use Scenario: Hardening RS-485/RS-422 transceivers in factory automation equipment exposed to maintenance ESD and motor-switching transients. IC Role / Device Role / Timing Role: Multi-line I/O protector - guards four isolated data channels (e.g., dual full-duplex links) with shared ground reference. Use Value: Reduces BOM count by integrating four protection paths, while 6 V VRWM aligns with standard 5 V logic supply rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NUP2201MR6 | Quad-channel, bidirectional, 5.5 V VRWM, 12 pF inter-I/O capacitance, 300 W peak power | Supports symmetric ±5 V signaling (e.g., CAN FD); higher capacitance limits use to ≤10 Mbps interfaces | Select NUP2201MR6 when bidirectional protection and lower VRWM are required, accepting reduced speed capability. |
| TPD4E05U06DQAR | Quad-channel, unidirectional, 5.5 V VRWM, 0.5 pF inter-I/O capacitance, 250 W peak power | Optimized for ultra-high-speed interfaces (USB 3.0, HDMI); lower power rating restricts lightning surge handling | Choose TPD4E05U06DQAR for >1 Gbps data rates where ESD energy is limited to IEC 61000-4-2 only. |
Compared with SRDA05-4R2G, NUP2201MR6 offers bidirectional clamping but trades off speed for robustness, while TPD4E05U06DQAR achieves ultra-low capacitance at the expense of 50% lower surge power - making SRDA05-4R2G the balanced choice for 100 Mbps–480 Mbps interfaces requiring full IEC 61000-4-2/4-4/4-5 compliance.
Availability
SRDA05-4R2G is available at Aetrix Electronics and suitable for USB port hardening, Ethernet PHY protection, T1/E1 line interface shielding, and industrial serial communication systems requiring stable component supply and long-term lifecycle support.
Supply support for SRDA05-4R2G 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, sensor, and ESD protection solutions for automotive, industrial, and communications markets.
The SRDA05-4R2G belongs to onsemi's transient voltage suppression portfolio, engineered specifically for high-speed data line protection where low capacitance, precise clamping, and multi-line integration are critical design constraints.
FAQ
What is the primary function of the SRDA05-4R2G in a circuit?
The SRDA05-4R2G functions as a quad-channel unidirectional ESD protection diode array that steers transient currents from four high-speed data lines (pins 1, 4, 6, 7) to reference rails (VCC or GND) during ESD, EFT, or lightning events. Its integrated structure combines steering diodes and a common surge diode to clamp voltages below 12 V at 10 A, protecting downstream ICs without degrading signal integrity due to its 5–8 pF inter-I/O capacitance. This makes SRDA05-4R2G ideal for USB 2.0 and Ethernet 10/100 interfaces.
How does the SRDA05-4R2G differ from a standard TVS diode?
Unlike a single-line TVS diode, the SRDA05-4R2G integrates four independent steering paths and one shared surge protection element in an SO-8 package, enabling simultaneous protection of multiple data lines with coordinated clamping behavior. It requires external reference connections (pins 2/3 and 5/8) to define clamping polarity and threshold - VC = VF + VRWM or VC = VCC + VF - whereas standard TVS devices operate independently per channel. The SRDA05-4R2G also specifies 5–8 pF inter-I/O capacitance, optimized for high-speed signaling, unlike general-purpose TVS diodes which often exceed 20 pF.
Can the SRDA05-4R2G be used in bidirectional signal lines like RS-485?
No - the SRDA05-4R2G is explicitly unidirectional and requires a defined reference (VCC or GND) to establish clamping polarity. Its internal schematic shows anode-connected I/O pins (1, 4, 6, 7) tied to a common cathode surge diode, meaning it conducts only when the I/O line voltage exceeds the reference by one diode drop. For true bidirectional lines such as RS-485 differential pairs, a bidirectional array like NUP2201MR6 or SP1001-04UTG is required. Using SRDA05-4R2G on bidirectional lines risks incomplete protection during negative transients unless externally biased.
What are the critical PCB layout requirements for optimal SRDA05-4R2G performance?
Optimal SRDA05-4R2G performance demands minimal trace inductance on pins 5 and 8 (negative reference), achieved by connecting them directly to a solid ground plane using multiple vias - not daisy-chained traces. I/O lines (pins 1, 4, 6, 7) must route with shortest possible length to protected components, and VCC connections (pins 2, 3) require low-impedance paths if used. The datasheet warns that even 10 nH of ground inductance can add >100 V overshoot during fast ESD events (di/dt > 1 A/ns), so SRDA05-4R2G layout must prioritize low-inductance grounding over routing convenience.
Is the SRDA05-4R2G still recommended for new designs?
No - the official onsemi datasheet (Rev. 7, June 2025) explicitly states "DISCONTINUED: This device is not recommended for new design." While SRDA05-4R2G remains available for legacy support and existing production, onsemi advises contacting their representatives for replacement recommendations. Aetrix Electronics maintains inventory for continuity, but engineers designing new systems should evaluate alternatives such as TPD4E05U06DQAR (for ultra-high-speed) or NUP2201MR6 (for bidirectional needs), validating compatibility with their specific interface voltage, speed, and surge requirements.
SRDA05-4R2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Steering (Rail to Rail)
- Unidirectional Channels:
- 4
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 5V
- Voltage - Breakdown (Min):
- 6V
- Voltage - Clamping (Max) @ Ipp:
- 12V
- Current - Peak Pulse (10/1000µs):
- 10A (8/20µs)
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 10pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SRDA05-4R2G FAQ
1.How can I place an order for SRDA05-4R2G through Aetrix?
Please submit a Request for Quotation (RFQ) for SRDA05-4R2G 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 SRDA05-4R2G reliable?
The price and inventory of SRDA05-4R2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SRDA05-4R2G is usually 5 days.
3.What payment methods are accepted for SRDA05-4R2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SRDA05-4R2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SRDA05-4R2G?
SRDA05-4R2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SRDA05-4R2G 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 SRDA05-4R2G?
For technical support, including SRDA05-4R2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SRDA05-4R2G requirements.
6.How does Aetrix verify that SRDA05-4R2G is sourced from the original manufacturer or authorized distributors?
All SRDA05-4R2G 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 SRDA05-4R2G meets industry standards.
7.What is the process for return or replacement of SRDA05-4R2G?
All SRDA05-4R2G units undergo pre-shipment inspection (PSI). If there is an issue with SRDA05-4R2G, 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 SRDA05-4R2G part is unused and in its original packaging.
Return procedure for SRDA05-4R2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SRDA05-4R2G 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
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