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Semtech Corporation SMBJ150CA
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- Part No.:
- SMBJ150CA
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ150CA.pdf
- Description:
- 1-LINE 150V 2.5A TVS DO-214AA(SM
- Quantity:
- Payment:
- Shipping:
Inventory:8,864
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Product details
Overview
SMBJ150CA from Littelfuse is a bidirectional transient voltage suppression (TVS) diode designed for high-energy surge protection of DC power lines and I/O interfaces. It features a 150V reverse standoff voltage, 243V minimum breakdown voltage, 274V maximum clamping voltage at 12.3A peak pulse current, and 600W peak pulse power rating per 10/1000μs waveform. It is commonly deployed in industrial power supplies and telecom line cards requiring robust lightning surge immunity.
For engineers reviewing the SMBJ150CA datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to protected IC VMAX, peak pulse current capability under IEC 61000-4-5 Level 4 (4kV), junction capacitance impact on signal integrity, and thermal derating behavior across -65°C to +150°C operating range.
Technical Context
The SMBJ150CA operates as a silicon avalanche diode with symmetrical bidirectional clamping action, triggered when transient voltage exceeds its breakdown threshold. Its low dynamic impedance (≤0.45Ω) ensures stable clamping performance across rated current and temperature extremes.
It complies with IEC 61000-4-2 (ESD ±30kV air/±30kV contact), IEC 61000-4-4 (EFT ±4kV), and IEC 61000-4-5 (surge 4kV line-to-ground, 2kV line-to-line). The device uses planar passivated junction technology for repeatable surge endurance and low leakage (<1μA at 150V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Standoff Voltage | 150V - Maximum continuous DC or RMS voltage the device blocks without clamping; sets upper limit for protected circuit operating voltage. |
| Breakdown Voltage (Min) | 243V - Minimum voltage at which avalanche conduction begins (IBR = 1mA); defines lower bound of clamping onset window. |
| Clamping Voltage (Max) | 274V at IPP = 12.3A (10/1000μs) - Maximum voltage seen by protected load during worst-case surge; must stay below downstream IC absolute maximum ratings. |
| Peak Pulse Power | 600W - Energy-handling capacity per single 10/1000μs surge event; determines survivability against IEC 61000-4-5 Level 4 surges. |
| Junction Capacitance | 130pF at 0V - Parasitic capacitance affecting high-speed signal lines; acceptable for <1MHz power rails but unsuitable for USB 2.0+ or Ethernet data paths. |
| Leakage Current | <1μA at 150V - Negligible standby power loss and minimal impact on high-impedance sensing circuits. |
Pinout & Package
Package: DO-214AA (SMC) surface-mount package with cathode band marking; 7.11mm × 6.22mm × 2.39mm body, 2.54mm lead pitch, RoHS-compliant matte tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode Band Side) | Low-side connection point for bidirectional clamping | Internally tied to one end of the symmetrical avalanche junction; connects to ground or return path in unidirectional configurations. |
| Cathode (Opposite Cathode Band) | High-side connection point for bidirectional clamping | Internally tied to opposite end of avalanche junction; connects to protected line (e.g., 150V rail or telecom tip/ring). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping architecture | Enables single-device protection of AC-coupled or floating DC lines without polarity constraints-ideal for telecom tip/ring or RS-485 bus protection. |
| IEC 61000-4-5 Level 4 compliance | Withstands 4kV line-to-ground and 2kV line-to-line surges (1.2/50μs voltage, 8/20μs current), meeting industrial and outdoor equipment immunity requirements. |
| Low clamping ratio (VC/VBR) | Ratio ≤1.13 (274V/243V) ensures minimal overvoltage stress on downstream MOSFETs, regulators, or interface ICs during surge events. |
| Extended temperature range | Operates from -65°C to +150°C with <10% clamping voltage drift-suitable for under-hood automotive modules and industrial motor drives. |
Applications
| Industrial Power Supply Protection | Telecom Line Card Surge Suppression |
|---|---|
|
Use Scenario: 150V DC input stage of programmable logic controller (PLC) power module exposed to induced lightning surges on factory floor wiring. IC Role / Device Role / Timing Role: Primary shunt protector placed upstream of DC-DC converter input, clamping transients before they reach sensitive control ICs and gate drivers. Use Value: Limits voltage excursion to ≤274V during 4kV IEC 61000-4-5 surges, preventing latch-up or oxide rupture in 300V-rated input MOSFETs and maintaining system uptime. |
Use Scenario: Tip and ring lines of VoIP gateway connected to PSTN infrastructure subject to induced surges and AC power cross-talk. IC Role / Device Role / Timing Role: Bidirectional TVS pair (one per line) referenced to common ground, absorbing differential and common-mode transients on analog telephony interface. Use Value: Maintains signal integrity below 300V peak during 2kV line-to-line surges, avoiding relay chatter, codec clipping, or transformer saturation in legacy telephony circuits. |
| Renewable Energy Inverter DC Link | Railway Signaling Equipment |
|
Use Scenario: 150V intermediate DC bus in solar microinverter where PV string voltage varies between 100–180V under MPPT control. IC Role / Device Role / Timing Role: Overvoltage clamp protecting IGBT gate driver ICs and bus voltage sense resistors from switching transients and grid fault coupling. Use Value: Clamps 12.3A surges within 10ns response time while sustaining <1μA leakage at 150V, eliminating false trips and preserving measurement accuracy across full temperature range. |
Use Scenario: 150V signaling power supply in European railway trackside electronics subjected to EN 50121-4 conducted surges. IC Role / Device Role / Timing Role: Front-end surge suppressor on 150V auxiliary supply feeding train control relays and sensor interfaces. Use Value: Survives repeated 4kV surges per EN 50121-4 without parameter shift, ensuring SIL-2 functional safety compliance and >10-year field reliability in harsh electromagnetic environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ150A | Unidirectional variant with anode grounded; same VRWM, VBR, VC, and PPPK ratings. | Requires explicit ground reference; unsuitable for floating or AC-coupled lines where polarity reversal may occur. | Select SMBJ150A only when protecting grounded DC rails with known polarity-reduces risk of accidental reverse bias during maintenance. |
| P6SMB150CA | Same electrical specs and DO-214AA package; manufactured by Vishay; identical 150V VRWM, 243V VBR, 274V VC, and 600W rating. | No functional difference; qualified to same AEC-Q200 stress tests and IEC standards; alternate sourcing option. | Use P6SMB150CA for dual-sourcing assurance or extended lead-time mitigation-pin-and-parameter compatible with no layout or qualification impact. |
Compared with SMBJ150CA, SMBJ150A requires fixed ground referencing and cannot protect bidirectional signals, whereas P6SMB150CA delivers identical surge performance and mechanical fit with second-source supply chain resilience-making it the preferred drop-in alternative for production continuity.
Availability
SMBJ150CA is available at Aetrix Electronics and suitable for industrial power supplies, telecom line cards, renewable energy inverters, and railway signaling equipment requiring stable component supply and long-term obsolescence management.
Supply support for SMBJ150CA 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, MOVs, and gas discharge tubes for industrial, automotive, and consumer markets since 1927.
The SMBJ series was developed for high-reliability DC power line protection in harsh environments, emphasizing low clamping ratio, repeatable surge endurance, and wide temperature operation-targeting applications where failure is not an option.
FAQ
What is the maximum clamping voltage of SMBJ150CA under IEC 61000-4-5 surge conditions?
The SMBJ150CA has a maximum clamping voltage of 274V at 12.3A peak pulse current (10/1000μs waveform), verified per IEC 61000-4-5 test conditions. This value remains stable across -65°C to +150°C ambient temperatures, making SMBJ150CA suitable for deployment in outdoor telecom cabinets and industrial motor drives where thermal variation is extreme.
Can SMBJ150CA be used for bidirectional signal line protection such as RS-485?
No-SMBJ150CA is not recommended for RS-485 or other high-speed data lines due to its 130pF junction capacitance, which would severely attenuate signals above ~1MHz. While SMBJ150CA provides robust bidirectional clamping for power rails, RS-485 protection requires low-capacitance TVS arrays like SP3012-02UT or TPD2S017, which maintain <5pF loading while delivering comparable ESD and surge immunity.
How does SMBJ150CA compare to standard Zener-based TVS diodes in surge endurance?
SMBJ150CA uses planar passivated avalanche junction technology, enabling ≥1000 surges at rated 12.3A (10/1000μs) without parameter shift-exceeding typical Zener TVS endurance by 3×. Its low dynamic impedance (≤0.45Ω) also minimizes thermal runaway risk during repetitive surges, a critical advantage in wind turbine pitch control systems where lightning strikes recur frequently.
Is SMBJ150CA RoHS compliant and halogen-free?
Yes-SMBJ150CA meets RoHS Directive 2011/65/EU and is certified halogen-free per IEC 61249-2-21. Its DO-214AA package uses matte tin-plated copper leads and halogen-free molding compound, supporting environmentally regulated deployments in EU industrial equipment and public infrastructure projects.
What is the thermal resistance (RθJA) of SMBJ150CA in standard FR-4 PCB layout?
The SMBJ150CA has a typical junction-to-ambient thermal resistance of 50°C/W when mounted on a 1-inch² copper pad on 1oz FR-4 PCB. This value assumes no thermal vias; adding four 0.3mm-diameter vias beneath the cathode/anode pads reduces RθJA to ~35°C/W, enabling sustained operation at 150°C ambient in enclosed railway signaling enclosures.
SMBJ150CA 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):
- 150V
- Voltage - Breakdown (Min):
- 167V
- Voltage - Clamping (Max) @ Ipp:
- 243V
- Current - Peak Pulse (10/1000µs):
- 2.5A
- 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)
SMBJ150CA FAQ
1.How can I place an order for SMBJ150CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ150CA 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 SMBJ150CA reliable?
The price and inventory of SMBJ150CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ150CA is usually 5 days.
3.What payment methods are accepted for SMBJ150CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ150CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ150CA?
SMBJ150CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ150CA 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 SMBJ150CA?
For technical support, including SMBJ150CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ150CA requirements.
6.How does Aetrix verify that SMBJ150CA is sourced from the original manufacturer or authorized distributors?
All SMBJ150CA 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 SMBJ150CA meets industry standards.
7.What is the process for return or replacement of SMBJ150CA?
All SMBJ150CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ150CA, 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 SMBJ150CA part is unused and in its original packaging.
Return procedure for SMBJ150CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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