My Inquiry
My Account
Semtech Corporation SRDA70-4.TBT
- Part No.:
- SRDA70-4.TBT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SRDA70-4.TBT.pdf
- Description:
- TVS DIODE 70VWM 3.3VC 8-SO
- Quantity:
- Payment:
- Shipping:
Inventory:811
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SRDA70-4.TBT from Semtech is a transient diverting suppressor designed for high-energy EOS protection of 22V-rated power or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A (8/20μs) peak pulse current handling, 27.5–28V clamping voltage at 40A, and ultra-low 20mΩ dynamic resistance. It protects USB Type-C power delivery buses, load switch inputs, and industrial I/O interfaces where stable clamping under temperature and current stress is critical.
For engineers reviewing the SRDA70-4.TBT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, real-world clamping behavior across temperature and current, and validated alternatives for 22V bus protection in USB PD, IoT, and industrial equipment designs.
Technical Context
The SRDA70-4.TBT employs a surge-rated FET as its primary protection element, activated by a precision trigger circuit that turns on the shunt path when transient voltage exceeds breakdown. Unlike conventional TVS diodes, its clamping voltage remains nearly constant-27.5–28V-from 24A to 40A (1.2/50μs + 8/20μs combination waveform, RS = 2Ω)-due to decreasing RDS(on) under surge conditions.
It operates across –40°C to +125°C with stable 22V reverse stand-off voltage (VRWM) and 25–27.9V breakdown (VBR), exhibits only 130–600nA leakage at VRWM, and maintains 175pF junction capacitance at 22V/1MHz-enabling use on high-speed power rails without signal integrity compromise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V reverse stand-off voltage (VRWM) - defines maximum continuous DC operating voltage before conduction begins. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs/1.2/50μs combo wave, RS = 2Ω) - ensures protected ICs (e.g., USB PD controllers) remain below damage threshold during worst-case surges. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements for 22V systems. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD robustness standards without derating. |
| Dynamic Resistance | 20mΩ (measured 1–40A, 8/20μs) - enables flat clamping curve and minimizes voltage overshoot during fast-rising transients. |
| Junction Capacitance | 175pF at 22V, 1MHz - low enough for 22V power rail protection without degrading transient response or causing resonance. |
Pinout & Package
SRDA70-4.TBT is housed in a RoHS-compliant, halogen-free DFN package measuring 1.6mm × 1.6mm × 0.55mm with 6 leads and UL 94V-0 molding compound. All pins must be connected per functional group to achieve rated surge performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current - all three pins must be connected to minimize inductance and maximize 40A capability. |
| 4, 5, 6 | IN | Protected line input - connects directly to 22V bus (e.g., VBUS in USB-C); all three pins are internally tied and must be shorted externally for full rating. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based transient diversion | Replaces traditional TVS with active shunt architecture - eliminates linear VC = VBR + IPP×RDYN rise, delivering flat clamping across full 24–40A range. |
| Temperature-stable clamping | Clamping voltage varies ≤0.5V from –40°C to +125°C at 40A - removes thermal derating uncertainty in industrial and automotive environments. |
| Low dynamic resistance | 20mΩ RDYN - reduces voltage overshoot during sub-100ns ESD events and improves energy dissipation efficiency vs. silicon avalanche devices. |
| High-energy surge rating | 1120W peak pulse power (8/20μs) - supports repeated lightning-surge exposure in remote meters, robotics, and outdoor IoT nodes. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting 20–22V VBUS lines in USB-C ports supporting up to 100W PD, exposed to ESD and system-level surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed between connector and PD controller or e-fuse, responding within nanoseconds to divert transients to ground. Use Value: Maintains 27.5–28V clamping regardless of ambient temperature or surge amplitude-preventing false trips and ensuring PD controller survival at 125°C. |
Use Scenario: Safeguarding input terminals of high-side load switches (e.g., HS2950P) in programmable logic controllers and smart sensors. IC Role / Device Role / Timing Role: Front-end transient shunt that limits voltage seen by the load switch's internal MOSFET gate oxide and drain-source junction. Use Value: Clamps below 28V while handling 40A surges-keeping stress on the load switch within safe SOA limits and avoiding catastrophic failure during field surges. |
| IoT Edge Node Power Rail Protection | Industrial Storage Device Interface Protection |
|
Use Scenario: Securing 22V auxiliary power rails in battery-backed wireless gateways, environmental monitors, and asset trackers deployed outdoors. IC Role / Device Role / Timing Role: Standalone EOS suppressor on main DC input, coordinated with upstream fuse and downstream LDO to form complete fault-tolerant power chain. Use Value: Delivers ±30kV ESD and 40A surge immunity in <2.56mm² footprint-enabling compact, ruggedized PCB layouts without thermal pads or large keepouts. |
Use Scenario: Protecting SATA or PCIe auxiliary power lines (3.3V/5V/12V/22V) in industrial SSD enclosures and RAID controllers subject to hot-plug transients. IC Role / Device Role / Timing Role: Point-of-entry clamp on 22V auxiliary supply rail feeding controller ICs and flash memory power management circuits. Use Value: 175pF capacitance avoids resonance with typical 10–100μF bulk capacitors, and stable clamping prevents data corruption during surge-induced brownouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P.C | Identical electrical specs, same DFN-6 package, identical marking (T22), and shared Semtech datasheet Rev 2.5 - confirmed pin-to-pin and functionally equivalent. | No difference; qualified for same USB PD, load switch, and industrial I/O use cases. | Select TDS2211P.C when requiring Semtech's standard tape-and-reel packaging (3,000 pcs/reel) and official part number traceability. |
| SRA70-4.TBT | Same manufacturer (Semtech), same DFN-6 package, same 22V VRWM, but rated for 30A (8/20μs) peak pulse current and 29V clamping at 30A - lower surge capacity and higher clamping than SRDA70-4.TBT. | Suitable for cost-sensitive 22V applications with lower surge exposure (e.g., consumer tablets), not recommended for industrial 40A requirements. | Choose SRA70-4.TBT only if design validation confirms 30A surge margin is sufficient and 29V clamping remains below protected IC thresholds. |
Compared with TDS2211P.C (identical spec and fit) and SRA70-4.TBT (lower 30A rating and higher 29V clamping), SRDA70-4.TBT delivers the highest certified surge robustness (40A/28V) in this Semtech family-making it the preferred choice for mission-critical 22V industrial and USB PD applications demanding full IEC 61000-4-5 Level 4 compliance.
Availability
SRDA70-4.TBT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch protection, and ruggedized IoT edge node designs requiring stable component supply with guaranteed long-term availability.
Supply support for SRDA70-4.TBT 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 connectivity.
SRDA70-4.TBT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 22V power rail protection where flat clamping, temperature stability, and high surge endurance are mandatory.
FAQ
What is the maximum continuous operating voltage for SRDA70-4.TBT?
The SRDA70-4.TBT has a reverse stand-off voltage (VRWM) of 22V, meaning it can continuously block up to 22V DC or RMS AC without significant leakage. This makes SRDA70-4.TBT ideal for protecting 20–22V USB PD VBUS lines and industrial 24V nominal rails operating within tolerance.
How does SRDA70-4.TBT differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes whose clamping voltage rises linearly with peak pulse current (VC = VBR + IPP × RDYN), SRDA70-4.TBT uses a triggered FET architecture that maintains clamping at 27.5–28V from 24A to 40A. This flat response is confirmed in the SRDA70-4.TBT datasheet Figure 3 and eliminates thermal derating concerns.
Is SRDA70-4.TBT suitable for protecting high-speed data lines like USB SuperSpeed?
No - SRDA70-4.TBT is optimized for power and low-speed I/O lines with 175pF junction capacitance, which would degrade signal integrity on USB 3.x or PCIe lanes. For those, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF). SRDA70-4.TBT is intended for VBUS, CC, SBU, or load switch enable lines-not differential data pairs.
What PCB layout practices are required to achieve the full 40A rating of SRDA70-4.TBT?
To achieve the rated 40A (8/20μs) surge performance, all three GND pins (1, 2, 3) and all three IN pins (4, 5, 6) must be connected with low-inductance traces. Use multiple vias to inner ground planes, place SRDA70-4.TBT within 5mm of the connector, and avoid stubs or splits in the protected line - as specified in the SRDA70-4.TBT application note Figure 7.
Does SRDA70-4.TBT require a thermal pad or heatsink for surge dissipation?
No - SRDA70-4.TBT dissipates surge energy in the channel of its integrated FET, not in a PN junction, so no thermal pad is needed. The DFN-6 package relies on copper area and via connections to ground for transient current handling, not steady-state thermal management. This is explicitly noted in the SRDA70-4.TBT datasheet Section "Layout Guidelines".
SRDA70-4.TBT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- RailClamp®, SRDA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Steering (Rail to Rail)
- Unidirectional Channels:
- 4
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 70V (Max)
- Voltage - Breakdown (Min):
- 85V
- Voltage - Clamping (Max) @ Ipp:
- 3.3V
- Current - Peak Pulse (10/1000µs):
- 10A (8/20µs)
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 15pF @ 1MHz
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
SRDA70-4.TBT FAQ
1.How can I place an order for SRDA70-4.TBT through Aetrix?
Please submit a Request for Quotation (RFQ) for SRDA70-4.TBT 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 SRDA70-4.TBT reliable?
The price and inventory of SRDA70-4.TBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SRDA70-4.TBT is usually 5 days.
3.What payment methods are accepted for SRDA70-4.TBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SRDA70-4.TBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SRDA70-4.TBT?
SRDA70-4.TBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SRDA70-4.TBT 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 SRDA70-4.TBT?
For technical support, including SRDA70-4.TBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SRDA70-4.TBT requirements.
6.How does Aetrix verify that SRDA70-4.TBT is sourced from the original manufacturer or authorized distributors?
All SRDA70-4.TBT 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 SRDA70-4.TBT meets industry standards.
7.What is the process for return or replacement of SRDA70-4.TBT?
All SRDA70-4.TBT units undergo pre-shipment inspection (PSI). If there is an issue with SRDA70-4.TBT, 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 SRDA70-4.TBT part is unused and in its original packaging.
Return procedure for SRDA70-4.TBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SRDA70-4.TBT 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 …
