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Semtech Corporation SCHJ22.5K
- Part No.:
- SCHJ22.5K
- Manufacturer:
- Semtech Corporation
- Category:
- Single Diodes
- Package:
- Axial
- Datasheet:
-
SCHJ22.5K.pdf
- Description:
- DIODE GEN PURP 22.5KV 50MA AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:4,393
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Product details
Overview
SCHJ22.5K 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, 27.5–28V clamping voltage at 40A, and DFN 1.6×1.6×0.55mm 6-lead package - deployed in USB Type-C PD input protection.
For engineers reviewing the SCHJ22.5K datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low dynamic resistance (20mΩ), junction capacitance (175pF), and compatibility with industrial surge standards (±1kV, RS=42Ω).
Technical Context
The SCHJ22.5K 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) from 24A to 40A due to decreasing RDS(on) under surge conditions.
It operates across –40°C to +125°C with stable reverse leakage (<600nA at 22V), 175pF junction capacitance at 22V/1MHz, and 1120W peak pulse power rating - enabling robust protection in thermally demanding environments without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches nominal USB PD bus and industrial 24V rail systems without derating. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays below 30V threshold of most 24V-rated load switches and PD controllers. |
| Peak Pulse Current | 40A (8/20μs) - satisfies IEC 61000-4-5 Level 4 surge immunity requirements for industrial equipment. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD test mandates. |
| Dynamic Resistance | 20mΩ - enables low-voltage-drop shunting, minimizing energy dissipation in the device during surge events. |
| Junction Capacitance | 175pF at 22V/1MHz - compatible with DC power rails and low-speed control lines; not suitable for >100MHz signal paths. |
Pinout & Package
Package: DFN 1.6mm × 1.6mm × 0.55mm, 6-lead, Pb-free, RoHS/WEEE compliant, UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground connection points - all three must be soldered to maximize surge current return path and minimize inductance. |
| 4, 5, 6 | IN | Parallel-connected input terminals for protected line - all three required to achieve full 40A rating and optimal clamping performance. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V across 24–40A range - eliminates need for over-specifying IPP to meet voltage thresholds. |
| Temperature-stable clamping | Clamps at ~27.5V from –40°C to +125°C - avoids thermal derating and ensures consistent protection in wide-temperature deployments. |
| FET-based shunt topology | Dissipates surge energy in channel conduction rather than PN-junction - enables higher energy handling per unit area vs. TVS diodes. |
| Low dynamic resistance | 20mΩ measured between 1A–40A - reduces voltage overshoot during fast-rising transients (e.g., ESD) and improves system margin. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting VBus lines in USB Type-C receptacles supporting up to 20V/5A PD negotiation. IC Role / Device Role / Timing Role: Primary EOS shunt suppressor placed between connector and PD controller or load switch. Use Value: Maintains clamping below 28V across temperature and current - prevents damage to 24V-rated PD controllers even at 125°C ambient. |
Use Scenario: Safeguarding input pins of industrial-grade load switches (e.g., HS2950P) against lightning-induced surges in remote meters and robotics. IC Role / Device Role / Timing Role: Front-end transient diverter that limits voltage seen by internal FET gate oxide and drain-source junction. Use Value: Enables use of cost-optimized load switches without requiring internal overvoltage tolerance beyond 30V. |
| IoT Device Power Rail Protection | Storage Device DC Input Protection |
Use Scenario: Securing 22V-rated auxiliary power inputs in battery-backed IoT gateways exposed to field ESD and induced surges. IC Role / Device Role / Timing Role: Single-component solution replacing multi-stage TVS+MOV designs for compact, reliable DC input hardening. Use Value: 1.6×1.6mm footprint saves >60% board area versus discrete TVS+capacitor solutions while delivering superior clamping consistency. |
Use Scenario: Protecting SATA or NVMe storage module 22V auxiliary rails from hot-plug transients and backplane coupling. IC Role / Device Role / Timing Role: Standalone transient suppressor on main DC input, upstream of LDOs and PMICs. Use Value: 175pF capacitance avoids signal integrity issues on DC lines, while ±30kV ESD rating meets ruggedized storage enclosure requirements. |
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 die, identical electrical specs, Semtech-marked variant - direct functional match with identical DFN-6 layout. | Identical use cases: USB PD, load switch, industrial 22V rail protection. | Select SCHJ22.5K when sourcing through Aetrix Electronics' traceable supply chain with volume procurement support. |
| uClamp2411ZA | 24V working voltage, lower 24A IPP rating, ±30kV ESD, but uses standard TVS diode architecture - clamping rises with current and temperature. | Better suited for CC/SBU lines in USB-C; less ideal for high-current VBus protection due to higher and variable clamping (~33V at 24A). | Consider only if board space allows larger package or if cost sensitivity outweighs clamping stability requirements. |
Compared with TDS2211P, SCHJ22.5K offers identical performance and footprint; compared with uClamp2411ZA, SCHJ22.5K delivers 40A surge capability and flat 27.5V clamping - critical for protecting sensitive 24V-rated ICs under worst-case thermal and current conditions.
Availability
SCHJ22.5K is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and IoT device power rail protection requiring stable component supply, long-term lifecycle management, and RoHS-compliant sourcing.
Supply support for SCHJ22.5K 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 SCHJ22.5K belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 22V–24V power rail protection where clamping stability across temperature and current is mission-critical.
FAQ
What is the exact working voltage rating of the SCHJ22.5K?
The SCHJ22.5K has a reverse stand-off voltage (VRWM) of 22V, meaning it remains non-conductive up to this DC or continuous AC voltage level on the protected line. This rating aligns precisely with 22V industrial rails and USB PD 20V+ systems, ensuring no leakage or false triggering during normal operation.
Does the SCHJ22.5K meet IEC 61000-4-5 surge immunity requirements?
Yes, the SCHJ22.5K is rated for 40A peak pulse current (tp = 8/20μs) and ±1kV combination-wave surge (1.2/50μs voltage, 8/20μs current, RS = 42Ω), satisfying IEC 61000-4-5 Level 4 for industrial environments. Its 27.5–28V clamping ensures downstream components remain within safe operating voltage limits during such events.
How does the SCHJ22.5K differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes whose clamping voltage rises linearly with peak current (VC = VBR + IPP × RDYN), the SCHJ22.5K uses a triggered FET shunt that maintains clamping at ~27.5V from 24A to 40A. This flat response eliminates design uncertainty caused by temperature- and current-dependent voltage overshoot in traditional TVS devices.
What is the recommended PCB layout for optimal performance of the SCHJ22.5K?
All three IN pins (4, 5, 6) and all three GND pins (1, 2, 3) must be connected - no stubs or daisy-chaining. Place the SCHJ22.5K within 5mm of the protected connector, use short wide traces, and connect GND pins to an inner-layer ground plane via ≥3 vias each. Avoid thermal pads; energy is dissipated in the FET channel, not the die attach.
Is the SCHJ22.5K suitable for protecting high-speed data lines like USB SuperSpeed?
No - the SCHJ22.5K has 175pF junction capacitance, making it unsuitable for USB 3.x, PCIe, or other >100MHz signal paths. It is intended exclusively for DC power rails and low-speed control lines (e.g., USB-C VBus, load switch enable, industrial sensor power). For data lines, Semtech recommends RClamp3371ZC (0.25pF) instead of the SCHJ22.5K.
SCHJ22.5K 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):
- 22500 V
- Current - Average Rectified (Io):
- 50mA
- Voltage - Forward (Vf) (Max) @ If:
- 30 V @ 100 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- 2.5 µs
- Current - Reverse Leakage @ Vr:
- 1 µA @ 22500 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- -
- Operating Temperature - Junction:
- -55°C ~ 150°C
SCHJ22.5K FAQ
1.How can I place an order for SCHJ22.5K through Aetrix?
Please submit a Request for Quotation (RFQ) for SCHJ22.5K 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 SCHJ22.5K reliable?
The price and inventory of SCHJ22.5K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SCHJ22.5K is usually 5 days.
3.What payment methods are accepted for SCHJ22.5K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SCHJ22.5K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SCHJ22.5K?
SCHJ22.5K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SCHJ22.5K 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 SCHJ22.5K?
For technical support, including SCHJ22.5K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SCHJ22.5K requirements.
6.How does Aetrix verify that SCHJ22.5K is sourced from the original manufacturer or authorized distributors?
All SCHJ22.5K 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 SCHJ22.5K meets industry standards.
7.What is the process for return or replacement of SCHJ22.5K?
All SCHJ22.5K units undergo pre-shipment inspection (PSI). If there is an issue with SCHJ22.5K, 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 SCHJ22.5K part is unused and in its original packaging.
Return procedure for SCHJ22.5K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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