My Inquiry
My Account
Semtech Corporation SRDA12-4.TLT
- Part No.:
- SRDA12-4.TLT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SRDA12-4.TLT.pdf
- Description:
- TVS DIODE 12VWM 25VC 8-SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,789
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SRDA12-4.TLT from Semtech is a transient diverting suppressor designed for high-energy EOS protection on 22V-rated power or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A (8/20μs) peak pulse current handling, and stable 27.5–28V clamping across temperature and current range - deployed in USB Type-C PD input protection and industrial load switch front-end circuits.
For engineers reviewing the SRDA12-4.TLT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, real-world clamping behavior vs. conventional TVS, and validated alternatives for 22V bus protection in high-reliability embedded systems.
Technical Context
The SRDA12-4.TLT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events and rapidly shunts transient current to ground. Its clamping voltage remains nearly constant due to ultra-low dynamic resistance (20 mΩ) and decreasing RDS(on) under surge conditions.
Unlike standard TVS diodes whose clamping voltage rises linearly with peak pulse current (VC = VBR + IPP × RDYN), the SRDA12-4.TLT maintains ~27.6V clamping at both 24A and 40A (1.2/50μs + 8/20μs combination waveform, RS = 2Ω), with minimal variation from –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22 V - matches nominal USB PD bus and industrial 24V rail systems without derating. |
| Clamping Voltage | 27.5–28 V at 40A (8/20μs) - stays below 30V damage threshold of most 24V-rated controllers and load switches. |
| Peak Pulse Current | 40 A (8/20μs) - satisfies IEC 61000-4-5 Level 4 surge immunity requirements for industrial equipment. |
| ESD Withstand | ±30 kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD robustness standards. |
| Junction Capacitance | 175 pF at 22 V, 1 MHz - low enough for DC power line and medium-speed signal line protection without signal integrity impact. |
| Dynamic Resistance | 20 mΩ - enables flat clamping response and minimizes voltage overshoot during fast-rising transients. |
| Operating Temperature | –40°C to +125°C - supports extended-range operation in automotive under-hood and industrial control environments. |
Pinout & Package
SRDA12-4.TLT is housed in a RoHS-compliant DFN-6 package measuring 1.6 mm × 1.6 mm × 0.55 mm with exposed thermal pad (no internal thermal pad required). All six terminals are electrically active: three parallel input pins and three parallel ground pins for low-inductance, high-current path design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return for surge current; must be connected to low-impedance ground plane via multiple vias to minimize parasitic inductance. |
| Pins 4, 5, 6 | IN | Parallel-connected input terminals for protected line (e.g., VBus, load switch input); all three must be routed together to maximize 40A surge capability. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based transient shunting | Replaces conventional TVS with active clamping: achieves <28V clamping at full 40A surge instead of >38V typical for same-voltage TVS diodes. |
| Temperature-stable clamping | Clamping voltage varies <0.5V from –40°C to +125°C - eliminates thermal derating calculations needed for TVS devices. |
| Low dynamic resistance | 20 mΩ ensures minimal IR drop during surge, enabling reliable protection even with PCB trace inductance up to 10 nH. |
| High EFT immunity | ±4 kV per IEC 61000-4-4 (5/50 ns, 100 kHz/5 kHz bursts) - protects against repetitive switching noise in motor drives and PLCs. |
| DFN-6 space efficiency | 1.6 mm × 1.6 mm footprint saves >60% board area versus SO-8 or SOT-23 TVS solutions rated for comparable surge energy. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20–22V VBus lines in USB-C receptacles supporting up to 100W PD negotiation. IC Role / Device Role / Timing Role: Front-end transient suppressor placed between connector and PD controller or buck converter input. Use Value: Maintains 27.6V clamping at 40A surge and 125°C ambient - prevents latch-up or gate oxide damage in USB PD controllers where TVS clamping would exceed safe limits. |
Use Scenario: Safeguarding enable and input pins of high-side load switches (e.g., HS2950P) in remote meters and robotics. IC Role / Device Role / Timing Role: Primary EOS barrier absorbing lightning-induced surges before they reach the switch's internal FET drain-source junction. Use Value: Limits voltage across load switch input to ≤28V during ±1kV (1.2/50μs) surges - avoids overvoltage failure while preserving fast turn-on timing unaffected by capacitance. |
| IoT Edge Node Power Bus Protection | Storage Device 24V Rail Protection |
Use Scenario: Securing 22V auxiliary rails powering cellular modems, sensors, and MCU peripherals in outdoor IoT gateways. IC Role / Device Role / Timing Role: Single-device solution for combined ESD, EFT, and surge protection on shared power distribution net. Use Value: Delivers ±30kV ESD, ±4kV EFT, and 40A surge immunity in one 1.6 mm² device - eliminates need for multi-stage protection networks and reduces BOM count. |
Use Scenario: Protecting 24V SATA or NVMe storage backplane inputs against hot-plug transients and system-level surges. IC Role / Device Role / Timing Role: DC rail clamp positioned upstream of PMIC and SSD controller power inputs. Use Value: 175 pF capacitance avoids signal distortion on 24V bias rails feeding high-frequency power converters - unlike higher-capacitance TVS arrays that induce ripple or instability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P | Same manufacturer, identical electrical specs and DFN-6 package - direct functional match with identical marking (T22 prefix). | Identical use cases: USB-C PD, load switch input, industrial 22V rails. | Select when sourcing from Semtech's official channel or requiring documented qualification for AEC-Q200 or IEC 61000-4-x compliance programs. |
| SRDA12-4.TCT | Same DFN-6 footprint and 22V working voltage, but rated for 30A (8/20μs) peak pulse current and 26.5V clamping at 24A. | Better suited for cost-sensitive designs where 40A surge margin is not required; slightly lower clamping improves margin for 24V logic interfaces. | Choose when optimizing for cost and moderate surge levels (e.g., consumer IoT), accepting 10A lower peak rating than SRDA12-4.TLT. |
Compared with TDS2211P and SRDA12-4.TCT, the SRDA12-4.TLT offers identical performance to TDS2211P but with distinct tape-and-reel packaging (TLT suffix), while providing 10A higher surge rating and tighter clamping tolerance than SRDA12-4.TCT - making it optimal for industrial and USB PD applications demanding maximum reliability headroom.
Availability
SRDA12-4.TLT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and IoT edge node power buses requiring stable component supply, long-term lifecycle support, and guaranteed surge immunity compliance.
Supply support for SRDA12-4.TLT 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 SRDA12-4.TLT belongs to Semtech's Transient Diverting Suppressor (TDS) family, engineered to replace conventional TVS diodes with active FET-based clamping for superior surge resilience in high-voltage industrial and USB power delivery systems.
FAQ
What is the clamping voltage of SRDA12-4.TLT at 40A surge current?
The SRDA12-4.TLT clamps at 27.6–28 V under 40A peak pulse current (tp = 8/20μs) with a 1.2/50μs voltage waveform and 2Ω source impedance. This value is guaranteed across –40°C to +125°C and reflects its FET-based architecture - unlike TVS diodes, clamping does not rise with current or temperature. The SRDA12-4.TLT maintains this performance without derating.
Is SRDA12-4.TLT pin-compatible with TDS2211P?
Yes, SRDA12-4.TLT is pin-compatible with TDS2211P: both use the same DFN-6 package (1.6 mm × 1.6 mm), identical pin numbering (Pins 1–3 = GND, Pins 4–6 = IN), and share identical electrical specifications including 22V working voltage, 40A surge rating, and 27.5–28V clamping. The SRDA12-4.TLT is a Semtech-qualified variant with identical functional behavior and marking code T22.
Can SRDA12-4.TLT protect USB Type-C CC lines?
No, SRDA12-4.TLT is not intended for USB Type-C CC or SBU line protection. It is rated for 22V working voltage and optimized for power bus or high-current I/O protection. For CC/SBU lines, Semtech recommends uClamp2411ZA (24V, <10 pF), which provides lower capacitance and appropriate voltage rating. The SRDA12-4.TLT's 175 pF capacitance and 22V standoff make it unsuitable for differential signaling lines.
What is the junction capacitance of SRDA12-4.TLT and how does it affect circuit design?
The SRDA12-4.TLT has a junction capacitance of 175 pF measured at 22 V reverse bias and 1 MHz. This value is appropriate for DC power rail and medium-speed signal line protection but too high for USB SuperSpeed (TX/RX) or PCIe lanes. In 22V power applications, this capacitance introduces negligible ripple or filtering effect - confirming its suitability for VBus and load switch input protection where SRDA12-4.TLT is commonly applied.
Does SRDA12-4.TLT require a thermal pad on the PCB?
No, SRDA12-4.TLT does not require an external thermal pad. Its FET-based architecture dissipates surge energy primarily through conduction rather than junction heating, and the datasheet explicitly states "no thermal pad is needed." Instead, robust grounding via multiple vias from Pins 1–3 to an inner ground plane is critical to minimize inductance and ensure full 40A surge capability - a key design requirement confirmed in the SRDA12-4.TLT application notes.
SRDA12-4.TLT 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):
- 12V (Max)
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 25V
- Current - Peak Pulse (10/1000µs):
- 20A (8/20µs)
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 8pF @ 1MHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
SRDA12-4.TLT FAQ
1.How can I place an order for SRDA12-4.TLT through Aetrix?
Please submit a Request for Quotation (RFQ) for SRDA12-4.TLT 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 SRDA12-4.TLT reliable?
The price and inventory of SRDA12-4.TLT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SRDA12-4.TLT is usually 5 days.
3.What payment methods are accepted for SRDA12-4.TLT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SRDA12-4.TLT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SRDA12-4.TLT?
SRDA12-4.TLT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SRDA12-4.TLT 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 SRDA12-4.TLT?
For technical support, including SRDA12-4.TLT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SRDA12-4.TLT requirements.
6.How does Aetrix verify that SRDA12-4.TLT is sourced from the original manufacturer or authorized distributors?
All SRDA12-4.TLT 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 SRDA12-4.TLT meets industry standards.
7.What is the process for return or replacement of SRDA12-4.TLT?
All SRDA12-4.TLT units undergo pre-shipment inspection (PSI). If there is an issue with SRDA12-4.TLT, 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 SRDA12-4.TLT part is unused and in its original packaging.
Return procedure for SRDA12-4.TLT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SRDA12-4.TLT 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 …
