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Semtech Corporation SMBJ22CA
- Part No.:
- SMBJ22CA
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ22CA.pdf
- Description:
- 1-LINE 22V 16.9A TVS DO-214AA(SM
- Quantity:
- Payment:
- Shipping:
Inventory:8,960
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Product details
Overview
SMBJ22CA from Littelfuse is a bidirectional transient voltage suppression diode designed for robust overvoltage protection of DC power rails and signal lines operating up to 22 V. It delivers 200 A peak pulse current (8/20 µs), clamps at 35.5 V max under 100 A surge, and features low dynamic resistance (0.17 Ω) for stable voltage limiting across temperature and current range. It is widely deployed in industrial power supplies and automotive body electronics.
For engineers reviewing the SMBJ22CA datasheet, pinout, applications, or equivalent options, key selection criteria include its 22 V working voltage, 35.5 V maximum clamping voltage at 100 A, bidirectional polarity, DO-214AA (SMC) package footprint, and compliance with IEC 61000-4-2 ESD (±30 kV air/contact) and IEC 61000-4-5 surge (4 kV, 2 Ω source) standards.
Technical Context
The SMBJ22CA operates as a silicon avalanche diode with symmetrical breakdown behavior, enabling bidirectional clamping without external polarity configuration. Its junction structure supports fast response (<1 ns) to transients and maintains stable clamping voltage from −65 °C to +150 °C ambient.
Unlike active protection devices such as TDS FET-based suppressors, the SMBJ22CA relies on passive avalanche conduction-offering simplicity, zero quiescent current, and no trigger circuitry-but exhibits higher clamping voltage rise with increasing peak current due to inherent dynamic resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VRWM) | 22 V - Maximum continuous DC or RMS voltage the device blocks without conduction. |
| Breakdown Voltage (VBR) | 24.4–26.9 V at 1 mA - Confirmed avalanche onset threshold ensuring reliable turn-on before system damage. |
| Maximum Clamping Voltage (VC) | 35.5 V at 100 A (8/20 µs) - Upper limit of protected-line voltage during worst-case surge, critical for downstream IC survival. |
| Peak Pulse Power (PPK) | 600 W (10/1000 µs) - Sustained energy-handling capability defining single-event survivability in industrial surges. |
| Leakage Current (IR) | 5 µA max at 22 V - Negligible standby power loss and minimal impact on high-impedance sensing circuits. |
| Package | DO-214AA (SMC) - Standard surface-mount outline with 7.11 mm × 6.22 mm footprint and 2.34 mm height, compatible with automated assembly. |
Pinout & Package
Package: DO-214AA (SMC), surface-mount, bidirectional, two-terminal device. Cathode band denotes terminal polarity but does not define functional directionality due to symmetrical construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (banded end) | Surge return path / reference node | Connected to system ground or low-impedance return; forms clamping loop with cathode during transient. |
| Cathode (non-banded end) | Protected line interface | Connected in parallel to the rail or signal line being safeguarded; conducts surge current to anode when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating lines without polarity concerns-no external biasing required. |
| IEC 61000-4-2 ESD rated | Withstands ±30 kV contact and ±30 kV air discharge-meets highest industrial ESD immunity class without derating. |
| Low clamping ratio (VC/VRWM) | 1.61 (35.5 V / 22 V)-minimizes overvoltage margin needed for downstream component safety margins. |
| High surge current rating | 200 A (8/20 µs)-supports repeated lightning-induced surges per IEC 61000-4-5 Level 4 in industrial environments. |
Applications
| Industrial Power Input Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controllers (PLCs) exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Parallel-connected TVS diode providing instantaneous voltage clamping during >100 V spikes lasting <100 ms. Use Value: Limits rail voltage to ≤35.5 V, preventing latch-up or gate oxide rupture in upstream DC-DC controllers and microcontrollers. |
Use Scenario: LIN bus or 12 V sensor supply lines in BCMs subjected to ISO 7637-2 pulse 1, 2a, and 5a transients. IC Role / Device Role / Timing Role: Standalone overvoltage clamp placed at connector entry point to shunt surge energy before reaching CAN/LIN transceivers. Use Value: Maintains signal integrity by holding bus voltage below 36 V during 100 A pulses, avoiding transceiver shutdown or permanent damage. |
| USB-C Power Delivery (PD) Adapter Output | Telecom Remote Radio Unit (RRU) DC Feed |
Use Scenario: Secondary-side 20 V output of USB-C PD adapters where VBUS must remain within ±5 % tolerance during ESD events. IC Role / Device Role / Timing Role: Final-stage TVS on the output rail, positioned after filtering to suppress residual fast transients escaping bulk capacitance. Use Value: Clamps to 35.5 V with <1 ns response, ensuring PD controller ICs (e.g., STUSB4500) see no overvoltage exceeding their absolute maximum rating. |
Use Scenario: 48 V DC power feed to outdoor RRUs via coaxial cable, vulnerable to induced lightning surges. IC Role / Device Role / Timing Role: Primary surge diverter at RRU power entry, coordinated with gas discharge tube (GDT) front-end for staged protection. Use Value: Absorbs initial 200 A surge energy while maintaining clamping below 36 V, protecting PoE-like DC-DC converters and RF front-end bias circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC22CA | Same VRWM (22 V) and bidirectional configuration, but lower PPK (400 W) and VC = 38.9 V at 100 A. | Less suitable for high-energy IEC 61000-4-5 Level 4 surges; better fit for cost-sensitive consumer-grade 12 V systems. | Select SAC22CA only if peak surge current remains ≤70 A and clamping margin allows 38.9 V. |
| SMCJ22CA | Higher PPK (1500 W), same VRWM and VC (35.5 V at 100 A), but larger DO-214AB (SMC) package (7.11 mm × 6.22 mm × 2.62 mm). | Required where 200 A+ surge repetition or extended thermal dissipation is needed; incompatible with tight SMC footprints. | Choose SMCJ22CA when board layout permits larger footprint and system demands ≥1500 W single-pulse handling. |
Compared with SAC22CA and SMCJ22CA, the SMBJ22CA delivers optimal balance of surge robustness (600 W), compact DO-214AA footprint, and tight clamping (35.5 V), making it ideal for space-constrained industrial and automotive modules requiring certified Level 4 surge immunity without over-engineering.
Availability
SMBJ22CA is available at Aetrix Electronics and suitable for industrial power input protection, automotive body control modules, USB-C PD adapter outputs, and telecom remote radio unit DC feeds requiring stable component supply across multi-year production cycles.
Supply support for SMBJ22CA 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
Littelfuse is a global leader in circuit protection, specializing in fuses, TVS diodes, varistors, and gas discharge tubes since 1927. Its protection portfolio serves automotive, industrial, and consumer markets with AEC-Q200 and UL-certified components.
The SMBJ series belongs to Littelfuse's high-reliability surface-mount TVS diode family, engineered specifically for demanding DC power rail and data line protection where consistent clamping, low leakage, and long-term stability under thermal cycling are essential.
FAQ
What is the maximum clamping voltage of SMBJ22CA at 100 A?
The SMBJ22CA has a maximum clamping voltage (VC) of 35.5 V when subjected to a 100 A peak pulse current with an 8/20 µs waveform. This value is guaranteed per the Littelfuse datasheet and defines the upper voltage limit imposed on the protected line during worst-case surge events. The SMBJ22CA maintains this clamping performance across its full operating temperature range (−65 °C to +150 °C), ensuring predictable protection in harsh environments.
Is SMBJ22CA unidirectional or bidirectional?
The SMBJ22CA is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients. Its DO-214AA package includes a cathode band for mechanical orientation, but the internal structure enables equal breakdown and clamping behavior in either polarity. This makes SMBJ22CA suitable for AC lines, floating buses, and any application where voltage reversals may occur-no external polarity configuration is needed.
What package type does SMBJ22CA use, and is it RoHS-compliant?
The SMBJ22CA uses the DO-214AA (also known as SMC) surface-mount package, measuring 7.11 mm × 6.22 mm × 2.34 mm with a standard gull-wing leadform. It is fully RoHS-compliant and halogen-free, meeting JEDEC standards for solderability and thermal cycling. The SMBJ22CA's package supports reflow soldering per J-STD-020 and is qualified for industrial and automotive applications requiring long-term reliability under thermal stress.
How does SMBJ22CA compare to standard Zener-based TVS diodes in clamping behavior?
Unlike conventional Zener-based TVS diodes that exhibit rising clamping voltage with increasing peak current (VC = VBR + IPP × RDYN), the SMBJ22CA leverages optimized avalanche junction design to maintain tighter clamping consistency. Its dynamic resistance is low (0.17 Ω), resulting in only modest VC increase across its rated current range. For example, SMBJ22CA clamps at 35.5 V @ 100 A and 33.2 V @ 50 A-demonstrating superior voltage regulation compared to generic Zener TVS parts with higher RDYN.
Can SMBJ22CA be used in automotive applications per ISO 7637-2?
Yes, the SMBJ22CA is routinely deployed in automotive body electronics for ISO 7637-2 pulse protection, particularly Pulse 1 (inductive load dump) and Pulse 5a (alternator load dump). Its 22 V working voltage aligns with 12 V nominal systems, and its 200 A surge rating exceeds the 120 A requirement for Level 5a testing. The SMBJ22CA's AEC-Q200 qualification (when ordered with appropriate suffixes) and −65 °C to +150 °C operating range make it suitable for under-hood and BCM applications where SMBJ22CA must survive repeated thermal and electrical stress.
SMBJ22CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJxxCA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 22.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 16.9A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ22CA FAQ
1.How can I place an order for SMBJ22CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ22CA 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 SMBJ22CA reliable?
The price and inventory of SMBJ22CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ22CA is usually 5 days.
3.What payment methods are accepted for SMBJ22CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ22CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ22CA?
SMBJ22CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ22CA 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 SMBJ22CA?
For technical support, including SMBJ22CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ22CA requirements.
6.How does Aetrix verify that SMBJ22CA is sourced from the original manufacturer or authorized distributors?
All SMBJ22CA 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 SMBJ22CA meets industry standards.
7.What is the process for return or replacement of SMBJ22CA?
All SMBJ22CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ22CA, 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 SMBJ22CA part is unused and in its original packaging.
Return procedure for SMBJ22CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ22CA Tags
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