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Semtech Corporation 1N4247
- Part No.:
- 1N4247
- Manufacturer:
- Semtech Corporation
- Category:
- Single Diodes
- Package:
- Axial
- Datasheet:
-
1N4247.pdf
- Description:
- DIODE GEN PURP 600V 1A AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,426
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Product details
Overview
1N4247 from Semtech is a transient diverting suppressor (TDS) designed for high-energy EOS protection of 22V-rated power or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), 27.5–28V clamping voltage at 40A, and 20mΩ dynamic resistance. It protects USB PD, USB Type-C VBus, and load switch inputs in industrial and IoT equipment.
For engineers reviewing the 1N4247 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, DFN-6 package layout guidance, clamping stability across temperature, and direct alternatives for 22V bus protection where low-voltage overshoot margin is critical.
Technical Context
The 1N4247 uses 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 across 24A to 40A and −40°C to +125°C - due to decreasing RDS(on) under surge.
It operates with 22V reverse stand-off voltage (VRWM), 25–27.9V breakdown (VBR), and 175pF junction capacitance at 22V/1MHz. Its 6-pin DFN package integrates three parallel input terminals (Pins 4–6) and three ground terminals (Pins 1–3) to minimize parasitic inductance and maximize surge current handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V reverse stand-off - defines maximum continuous DC operating voltage before leakage rises significantly. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs + 1.2/50μs combo wave) - ensures protected ICs (e.g., USB PD controllers) stay below damage thresholds. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment interfaces. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD requirements without external shielding. |
| Dynamic Resistance | 20mΩ - enables stable clamping independent of current magnitude, unlike TVS diodes whose VC rises linearly with IPP. |
| Junction Capacitance | 175pF at 22V/1MHz - suitable for DC power rails and low-speed signal lines; not intended for >100MHz data paths. |
Pinout & Package
1N4247 is housed in a Pb-free, RoHS-compliant DFN package measuring 1.6mm × 1.6mm × 0.55mm with six terminals. All pins must be soldered for full 40A surge rating; thermal pad is not required as energy dissipates in the FET channel, not the junction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Low-inductance ground return path; all three must connect to solid ground plane via multiple vias for optimal surge current handling. |
| Pins 4, 5, 6 | IN | Parallel-connected input terminals for protected line (e.g., VBus); shared connection minimizes trace inductance and distributes surge current evenly. |
Key Features
| Feature | Design Value |
|---|---|
| Constant clamping over current range | 27.5–28V from 24A to 40A - eliminates need to overspecify IPP to meet voltage margin, simplifying selection. |
| Stable clamping over temperature | No increase in VC from −40°C to +125°C - enables reliable protection in uncontrolled thermal environments like industrial enclosures. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 5kHz & 100kHz) - protects against repetitive fast transients in motor drives and PLC I/O. |
| Low dynamic resistance | 20mΩ - reduces voltage drop during conduction, minimizing power dissipation and self-heating under repeated surges. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20V–22V VBus lines in USB-C ports supporting up to 100W PD, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Transient diverting suppressor placed between connector and PD controller or e-fuse IC. Use Value: Maintains 27.5–28V clamping at 40A and 125°C - prevents overvoltage damage to sensitive PD controllers where standard TVS would clamp >35V. |
Use Scenario: Safeguarding input of high-side load switches (e.g., HS2950P) in remote meters, robotics, and factory automation systems. IC Role / Device Role / Timing Role: Primary EOS shunt device connected directly at load switch VIN pin to limit transient voltage before internal FET breakdown. Use Value: Clamps below typical 30V FET gate oxide limits - avoids permanent damage to load switch during 1kV/42Ω surges per IEC 61000-4-5. |
| IoT Device Power Rail Protection | Storage Device 22V Supply Line Protection |
Use Scenario: Securing 22V auxiliary power rails in battery-backed smart sensors and edge gateways deployed outdoors or near EMI sources. IC Role / Device Role / Timing Role: Standalone surge protector on main DC input, upstream of DC-DC converters and PMICs. Use Value: Delivers 40A surge handling in 1.6×1.6mm footprint - saves >50% board area versus discrete TVS + MOV solutions while maintaining reliability. |
Use Scenario: Protecting 22V supply inputs of NVMe SSD modules and enterprise HDD backplanes subject to hot-plug transients and system-level surges. IC Role / Device Role / Timing Role: Point-of-load transient suppressor mounted adjacent to connector to minimize inductive coupling into storage controller ICs. Use Value: 175pF capacitance and <0.5V forward voltage ensure no signal integrity impact on 22V bias rails - unlike capacitive TVS arrays requiring trade-offs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A | Standard unidirectional TVS diode; 22V VRWM, 35.5V VC @ 12.3A, 100W PPPK, 6.5pF. | Higher clamping (35.5V vs. 28V) and lower IPP (12.3A vs. 40A); unsuitable for 40A surge or high-temp operation. | Select SMAJ22A only for cost-sensitive, low-energy applications where 28V clamping margin is unnecessary. |
| TDS2211P | Same family, identical specs and package - direct manufacturer-recommended replacement with identical marking (T22). | No functional or layout difference; fully interchangeable in all designs using 1N4247. | Choose TDS2211P for guaranteed availability and full documentation alignment with Semtech's latest revision (Rev 2.5, 2021). |
Compared with SMAJ22A, 1N4247 delivers 30% lower clamping voltage and >3× higher surge current, enabling robust protection in high-power USB PD and industrial systems; compared with TDS2211P, it is functionally identical but may reflect earlier manufacturing batch coding or legacy ordering designation.
Availability
1N4247 is available at Aetrix Electronics and suitable for USB Type-C power delivery, industrial load switch inputs, and IoT device power rail protection requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 1N4247 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 high-performance analog and mixed-signal semiconductors for power management, protection, and signal integrity.
The 1N4247 belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in 20–30V power rail protection where stable clamping and high surge endurance are mandatory.
FAQ
What is the exact package type and dimensions of the 1N4247?
The 1N4247 is supplied in a 6-pin DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed copper terminals. Pin 1 is marked by a laser dot; Pins 1–3 are GND, Pins 4–6 are IN. All six pins must be soldered to achieve rated 40A surge performance. No thermal pad is required.
Does the 1N4247 meet IEC 61000-4-5 surge immunity standards?
Yes, the 1N4247 is rated for 40A peak pulse current (8/20μs waveform) and supports ±1kV combination-wave surge testing per IEC 61000-4-5 with 42Ω source impedance - meeting Level 4 industrial immunity requirements for 22V systems.
How does the clamping behavior of the 1N4247 differ from standard TVS diodes?
Unlike standard TVS diodes whose clamping voltage rises linearly with current (VC = VBR + IPP × RDYN), the 1N4247 maintains 27.5–28V clamping from 24A to 40A due to its FET-based architecture and sub-20mΩ dynamic resistance - delivering consistent protection across surge magnitudes and temperatures.
Can the 1N4247 be used to protect USB Type-C CC and SBU lines?
No - the 1N4247 is designed for 22V power rail or high-current I/O protection (e.g., VBus). For CC/SBU lines, Semtech recommends uClamp2411ZA (24V, <1pF), which provides lower capacitance and faster response suited to low-voltage, high-speed control signals.
Is the 1N4247 RoHS and halogen-free compliant?
Yes, the 1N4247 is Pb-free, halogen-free, and compliant with RoHS and WEEE directives. Its molding compound meets UL 94V-0 flammability rating, and lead finish is lead-free per JEDEC J-STD-020 moisture sensitivity level 1.
1N4247 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- Axial
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 600 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 1 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 2 µs
- Current - Reverse Leakage @ Vr:
- 1 µA @ 600 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
- Operating Temperature - Junction:
- -
1N4247 FAQ
1.How can I place an order for 1N4247 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4247 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 1N4247 reliable?
The price and inventory of 1N4247 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4247 is usually 5 days.
3.What payment methods are accepted for 1N4247?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4247 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4247?
1N4247 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4247 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 1N4247?
For technical support, including 1N4247 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4247 requirements.
6.How does Aetrix verify that 1N4247 is sourced from the original manufacturer or authorized distributors?
All 1N4247 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 1N4247 meets industry standards.
7.What is the process for return or replacement of 1N4247?
All 1N4247 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4247, 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 1N4247 part is unused and in its original packaging.
Return procedure for 1N4247:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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