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Semtech Corporation SMBJ90CA
- Part No.:
- SMBJ90CA
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ90CA.pdf
- Description:
- 1-LINE 90V 4.1A TVS DO-214AA(SMB
- Quantity:
- Payment:
- Shipping:
Inventory:7,266
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Product details
Overview
SMBJ90CA from Littelfuse is a bidirectional transient voltage suppression (TVS) diode designed for high-energy surge protection of DC power lines and signal interfaces. It features a 90V reverse standoff voltage, 143V maximum clamping voltage at 25A peak pulse current (8/20μs), and 600W peak pulse power rating. The device is housed in a DO-214AA (SMC) package and is commonly deployed in industrial power supplies, automotive electronics, and telecom infrastructure to suppress lightning-induced surges and switching transients.
For engineers reviewing the SMBJ90CA datasheet, pinout, applications, or equivalent options, key selection criteria include its bidirectional clamping behavior, low dynamic impedance (≈0.7 Ω), stable clamping across temperature (–65°C to +150°C), compliance with IEC 61000-4-2 (±30 kV contact), and suitability for 48V/60V bus protection where fast response and low leakage (<1 μA at 72.5V) are critical.
Technical Context
The SMBJ90CA operates as a silicon avalanche diode with symmetrical breakdown characteristics, enabling bidirectional transient suppression without polarity constraints. Its junction structure delivers sub-nanosecond response time and maintains clamping voltage within ±5% over –65°C to +150°C ambient range.
It is rated for unidirectional/bidirectional operation per IEC 61000-4-5 (1.2/50μs voltage wave, 8/20μs current wave), supports repetitive surge events up to 1000 pulses, and exhibits <1 μA reverse leakage at 72.5V (80% VRWM), ensuring minimal standby power loss in always-on systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Standoff Voltage (VRWM) | 90 V - Maximum continuous DC or RMS voltage the device blocks without significant conduction. |
| Breakdown Voltage (VBR) | 100 V min @ IT = 1 mA - Ensures reliable avalanche initiation before protected circuit reaches damage threshold. |
| Maximum Clamping Voltage (VC) | 143 V @ IPP = 25 A (8/20μs) - Limits transient voltage seen by downstream ICs to safe levels during surge events. |
| Peak Pulse Power (PPK) | 600 W - Sustains high-energy surges typical of lightning-induced transients on 48V industrial buses. |
| Reverse Leakage Current (IR) | 1 μA max @ 72.5 V - Minimizes quiescent current draw in battery-backed or energy-sensitive applications. |
| Operating Temperature Range | –65°C to +150°C - Supports deployment in under-hood automotive, outdoor telecom, and industrial control environments. |
Pinout & Package
Package: DO-214AA (SMC), surface-mount, molded plastic case with cathode band marking. Dimensions: 7.11 mm × 6.22 mm × 2.34 mm. RoHS-compliant, halogen-free, matte tin-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode Band Side) | Transient return path / low-impedance ground reference | Connected to system ground plane; must be routed with minimal trace inductance to maintain clamping integrity. |
| Cathode (Opposite Cathode Band) | Protected line input / surge entry point | Connected directly to line under protection (e.g., 48V rail or RS-485 bus); placement within 5 mm of connector is critical. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating DC lines without polarity concerns. |
| Low clamping ratio (VC/VBR ≈ 1.43) | Delivers tighter voltage margin between operating and failure thresholds than standard TVS diodes (typ. >1.6). |
| High surge robustness (25A, 8/20μs) | Withstands ≥1000 repetitive surges per IEC 61000-4-5, supporting long-term reliability in harsh EMI environments. |
| Sub-nanosecond response time | Activates within <1 ns to clamp fast-rising ESD and switching spikes before sensitive ICs experience overstress. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 48V auxiliary power rail in PLC controllers exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Primary surge shunt element placed at input filter stage to limit voltage excursion to ≤143V during 25A surges. Use Value: Prevents latch-up or gate oxide rupture in downstream DC-DC controllers (e.g., LM5143A) by maintaining clamping below their absolute maximum rating. |
Use Scenario: CAN FD data lines and 12V sensor supply inputs in BCM modules subjected to ISO 7637-2 pulse 1/2/5a. IC Role / Device Role / Timing Role: Bidirectional TVS on each CAN_H/CAN_L pair and 12V bias rail to absorb coupled transients without polarity inversion. Use Value: Enables compliance with automotive EMC requirements while avoiding false triggering due to its stable 90V standoff and low leakage. |
| Telecom Base Station DC Feeder | Smart Meter Voltage Monitoring Input |
Use Scenario: -48V DC feeder line entering outdoor macrocell base station cabinets, vulnerable to lightning-induced surges. IC Role / Device Role / Timing Role: First-stage protector upstream of DC-DC converters and PMICs, rated for 600W peak power per IEC 61000-4-5 Level 4. Use Value: Reduces need for secondary protection stages by clamping reliably at 143V even after 1000 surge cycles, lowering BOM cost and board area. |
Use Scenario: High-impedance voltage divider input (e.g., for 230VAC sensing via resistive network) in utility smart meters. IC Role / Device Role / Timing Role: Overvoltage clamp on metering IC analog input to prevent ADC saturation or internal ESD damage during grid switching events. Use Value: Maintains measurement accuracy by limiting input voltage to ≤143V without adding series resistance or capacitance that would distort AC waveform sampling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ90A | Unidirectional version; same VRWM (90V), VC (143V), and package but conducts only in reverse direction. | Requires external polarity management; unsuitable for AC or floating DC lines without rectification. | Select SMBJ90A only when protecting strictly unidirectional rails with known polarity and no risk of reverse voltage exposure. |
| SAC90 | Same VRWM (90V) and bidirectional function, but lower PPK (400W) and higher VC (150V @ 15A); TO-220AC package. | Larger footprint and through-hole mounting; better thermal dissipation but incompatible with SMT-only designs. | Choose SAC90 only when board-level thermal management allows TO-220 and peak surge energy is limited to ≤400W. |
Compared with SMBJ90A and SAC90, the SMBJ90CA provides optimal balance of bidirectional capability, SMT compatibility, and 600W surge handling-making it the preferred choice for space-constrained, polarity-agnostic 48V/60V protection where consistent clamping and low leakage are design-critical.
Availability
SMBJ90CA is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and telecom DC feeder systems requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SMBJ90CA 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 for industrial, automotive, and consumer markets.
The SMBJ90CA belongs to Littelfuse's SMBJ series of high-power TVS diodes, engineered specifically for robust, low-clamping protection of 24V–72V DC systems against lightning, ESD, and inductive switching transients.
FAQ
What is the maximum clamping voltage of SMBJ90CA at 25A peak pulse current?
The SMBJ90CA has a maximum clamping voltage of 143 V at 25 A peak pulse current (8/20 μs waveform). This value is guaranteed per the Littelfuse datasheet and ensures downstream components remain below their absolute maximum voltage ratings during surge events. The SMBJ90CA maintains this clamping performance across its full operating temperature range (–65°C to +150°C), making it suitable for demanding industrial and automotive applications.
Is SMBJ90CA unidirectional or bidirectional?
SMBJ90CA is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients. Its DO-214AA package lacks polarity-specific markings beyond the cathode band, and its electrical specifications (e.g., VRWM = 90 V, VBR ≥ 100 V) apply equally in either direction. This makes SMBJ90CA ideal for protecting AC-coupled interfaces, floating DC buses, or any application where voltage polarity reversal cannot be guaranteed.
Can SMBJ90CA replace SMBJ90A in a design?
No-SMBJ90CA cannot directly replace SMBJ90A without circuit review. While both share identical VRWM (90 V) and clamping voltage (143 V), SMBJ90A is unidirectional and will not conduct on positive transients. Substituting SMBJ90CA for SMBJ90A introduces bidirectional conduction, which may cause unintended current paths or ground loop issues in polarity-sensitive circuits. Always verify signal topology and grounding before interchanging unidirectional and bidirectional TVS devices like SMBJ90CA and SMBJ90A.
What is the reverse leakage current specification for SMBJ90CA at 72.5V?
At 72.5 V (80% of VRWM), the SMBJ90CA exhibits a maximum reverse leakage current of 1 μA. This low leakage ensures minimal power loss in always-on systems such as smart meters or remote sensors, and avoids loading high-impedance voltage monitoring circuits. The value is measured at 25°C and remains within specification up to +150°C, supporting reliable operation in thermally stressed environments.
Does SMBJ90CA meet IEC 61000-4-2 and IEC 61000-4-5 standards?
Yes-SMBJ90CA is rated for ±30 kV contact and ±30 kV air discharge per IEC 61000-4-2, and withstands 1.2/50 μs voltage waveforms with 8/20 μs current waveforms per IEC 61000-4-5 (Level 4, 4 kV line-to-ground). These ratings are validated per Littelfuse test reports and make SMBJ90CA suitable for end-equipment requiring full immunity certification in industrial and telecom applications.
SMBJ90CA 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):
- 90V
- Voltage - Breakdown (Min):
- 100V
- Voltage - Clamping (Max) @ Ipp:
- 146V
- Current - Peak Pulse (10/1000µs):
- 4.1A
- 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)
SMBJ90CA FAQ
1.How can I place an order for SMBJ90CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ90CA 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 SMBJ90CA reliable?
The price and inventory of SMBJ90CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ90CA is usually 5 days.
3.What payment methods are accepted for SMBJ90CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ90CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ90CA?
SMBJ90CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ90CA 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 SMBJ90CA?
For technical support, including SMBJ90CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ90CA requirements.
6.How does Aetrix verify that SMBJ90CA is sourced from the original manufacturer or authorized distributors?
All SMBJ90CA 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 SMBJ90CA meets industry standards.
7.What is the process for return or replacement of SMBJ90CA?
All SMBJ90CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ90CA, 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 SMBJ90CA part is unused and in its original packaging.
Return procedure for SMBJ90CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ90CA Tags
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