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Semtech Corporation SMBJ58CA
- Part No.:
- SMBJ58CA
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ58CA.pdf
- Description:
- TVS DIODE 58VWM 93.6VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:677
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Product details
Overview
SMBJ58CA from Littelfuse is a bidirectional transient voltage suppression (TVS) diode designed for robust overvoltage protection of DC power lines and signal interfaces. It features a 58V reverse standoff voltage, 64.4V minimum breakdown voltage, 93.6V maximum clamping voltage at 11.9A peak pulse current (8/20μs), 600W peak pulse power rating, and ±30kV IEC 61000-4-2 ESD immunity - deployed in industrial power supplies, automotive ECUs, and PoE-powered equipment.
For engineers reviewing the SMBJ58CA datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability under surge stress, low leakage (<1μA @ VRWM), unidirectional/bidirectional configuration verification, JEDEC DO-214AA (SMB) package thermal performance, and compatibility with IEC 61000-4-5 Level 3/4 surge requirements.
Technical Context
The SMBJ58CA operates as a silicon avalanche diode with symmetrical bidirectional clamping behavior, enabling protection of AC-coupled or floating DC lines without polarity constraints. Its junction structure delivers fast response (<1.0 ps), low dynamic impedance (~0.3Ω), and stable clamping across -65°C to +150°C ambient range.
Unlike active suppressors such as TDS2211P, the SMBJ58CA relies on passive avalanche conduction - no trigger circuit or FET switching - resulting in fixed VBR/VC relationships governed by semiconductor physics rather than controlled shunt activation. This makes it suitable for cost-sensitive, high-reliability surge suppression where sub-nanosecond response and minimal capacitance (<100 pF) are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Standoff Voltage (VRWM) | 58 V - Maximum continuous DC or RMS voltage the device blocks without significant leakage. |
| Breakdown Voltage (VBR) | 64.4 V min @ IT = 1 mA - Avalanche conduction initiates reliably above this threshold during transients. |
| Clamping Voltage (VC) | 93.6 V max @ IPP = 11.9 A (8/20 μs) - Limits protected circuit voltage to safe level during worst-case surge. |
| Peak Pulse Power (PPK) | 600 W @ tp = 8/20 μs - Sustains high-energy surges per IEC 61000-4-5 without failure. |
| ESD Withstand | ±30 kV contact & air per IEC 61000-4-2 - Survives direct human-body-model ESD events without degradation. |
| Leakage Current (IR) | 1 μA max @ VRWM = 58 V - Ensures negligible standby power loss and signal integrity in high-impedance circuits. |
| Junction Capacitance | 85 pF @ VR = 0 V, f = 1 MHz - Low enough for <100 Mbps data lines but not RF or USB 3.x applications. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, thermally enhanced plastic case with cathode band marking. Dimensions: 4.57 mm × 3.94 mm × 2.29 mm. RoHS-compliant, halogen-free, matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode Band Side) | Low-side terminal for bidirectional clamping | Connected to ground or return path; forms symmetrical clamp path with cathode. |
| Cathode (Marked End) | High-side terminal for bidirectional clamping | Connected to protected line; enables equal clamping in both polarities relative to Anode. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping architecture | Enables single-device protection of AC lines, differential buses, or floating DC rails without polarity concerns. |
| JEDEC DO-214AA (SMB) package | Offers 2× higher power density vs. SMA, with proven thermal reliability in reflow-soldered industrial PCBs. |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes voltage overshoot during surge, reducing stress on downstream MOSFETs, controllers, and regulators. |
| Ultra-fast response time (<1.0 ps) | Activates before most IC input structures can be damaged by ESD or lightning-induced edge transients. |
| Extended operating temperature range | -65°C to +150°C junction operation supports under-hood automotive, outdoor telecom, and industrial control environments. |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) CAN Bus |
|---|---|
Use Scenario: 24V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary surge limiter placed upstream of DC-DC converter and EMI filter to prevent catastrophic failure of input rectifiers and bulk capacitors. Use Value: Clamps 100V/10A transients to ≤93.6V within nanoseconds, preserving input stage reliability while meeting EN 61000-4-5 Level 4 compliance. |
Use Scenario: CAN_H/CAN_L lines in vehicle BCM subjected to ESD events during connector mating and battery jump-start transients. IC Role / Device Role / Timing Role: Bidirectional TVS pair (one per line) referenced to chassis ground, providing common-mode and differential-mode surge suppression. Use Value: Maintains <100 pF capacitance to avoid CAN bit-rate distortion at 500 kbps, while surviving ±30 kV contact ESD and 10/700 μs telecom surges. |
| IEEE 802.3af/at PoE PD Interface | AC-DC Adapter Secondary-Side Output Protection |
Use Scenario: Powered Device (PD) front-end receiving up to 57V DC over Ethernet pairs, vulnerable to cable discharge events and induced surges. IC Role / Device Role / Timing Role: First-line protector on PSE-facing side of PD interface IC, clamping surges before they reach IEEE 802.3at classification circuitry. Use Value: 58V VRWM aligns with PoE+ maximum open-circuit voltage; 93.6V VC ensures PD controller ICs (e.g., TPS23753) remain below absolute maximum ratings. |
Use Scenario: 12V/24V output rail of wall-mounted AC-DC adapter used in medical monitors and test equipment. IC Role / Device Role / Timing Role: Final-stage overvoltage clamp preventing output short-circuit damage to connected loads during regulator fault conditions. Use Value: Low leakage (<1 μA) avoids loading regulation feedback loop; DO-214AA package withstands repeated 600W surges without bond-wire fatigue. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ58A | Unidirectional version; anode grounded, cathode to line - requires correct polarity orientation. | Suitable only for DC lines with known, fixed polarity (e.g., +12V rail); not usable on AC or floating buses. | Select SMBJ58A only when polarity is guaranteed and ground-referenced layout simplifies routing. |
| SMCJ58CA | Higher 1500W peak power rating, larger DO-214AB (SMC) package - same 58V VRWM and bidirectional function. | Used where higher surge margin is needed (e.g., outdoor telecom, railway systems) and PCB space allows larger footprint. | Choose SMCJ58CA when system-level testing reveals >600W surge exposure or thermal derating demands larger thermal mass. |
Compared with SMBJ58A and SMCJ58CA, the SMBJ58CA uniquely balances 600W surge capability, compact DO-214AA footprint, and polarity-agnostic bidirectional clamping - making it optimal for space-constrained, mixed-polarity industrial and automotive interfaces where layout flexibility and consistent protection behavior are critical.
Availability
SMBJ58CA is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and PoE-powered devices requiring stable component supply, long-term lifecycle support, and full traceability from certified sources.
Supply support for SMBJ58CA 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 since 1927.
The SMBJ series was engineered specifically for high-reliability, surface-mount surge suppression in harsh environments - emphasizing low clamping ratio, wide temperature operation, and JEDEC-standardized manufacturability.
FAQ
What is the maximum clamping voltage of SMBJ58CA under IEC 61000-4-5 surge conditions?
The SMBJ58CA has a maximum clamping voltage (VC) of 93.6 V when subjected to a 11.9 A peak pulse current with an 8/20 μs waveform - the standard test condition for IEC 61000-4-5 Level 3 and Level 4 surge immunity. This value is guaranteed across the full operating temperature range (-65°C to +150°C) and ensures downstream components like DC-DC controllers and microcontrollers remain within safe operating limits during surge events. The SMBJ58CA maintains this clamping performance without degradation over its rated lifetime.
Is SMBJ58CA suitable for protecting USB Type-C power delivery lines?
No - SMBJ58CA is not recommended for USB Type-C power delivery (PD) lines. Its 85 pF junction capacitance and 93.6 V clamping voltage exceed the requirements for 20 V PD bus protection, where low-capacitance active suppressors like TDS2211P (175 pF but constant ~28 V clamping) or specialized low-C TVS arrays are preferred. The SMBJ58CA's 58 V VRWM also exceeds typical PD bus voltages (up to 20 V), risking unnecessary leakage and false triggering. For USB Type-C, use devices explicitly rated for 20–24 V operation and <1 pF capacitance on high-speed lanes.
How does SMBJ58CA differ from unidirectional SMBJ58A?
The SMBJ58CA is bidirectional, meaning it clamps symmetrically for both positive and negative transients - ideal for AC lines, floating DC rails, or differential buses like RS-485. In contrast, SMBJ58A is unidirectional: it conducts only when cathode voltage exceeds anode by ≥64.4 V, requiring strict polarity alignment (cathode to line, anode to ground). Using SMBJ58A on a bidirectional signal risks failure during negative excursions. The SMBJ58CA eliminates polarity dependency, simplifying layout and improving robustness in mixed-signal or undefined-ground systems.
What is the leakage current specification for SMBJ58CA at rated standoff voltage?
The SMBJ58CA specifies a maximum reverse leakage current (IR) of 1 μA at its rated reverse standoff voltage (VRWM) of 58 V and ambient temperature of 25°C. At elevated temperatures (e.g., +85°C), leakage increases predictably to ≤5 μA - still well within acceptable limits for high-impedance monitoring circuits and precision voltage rails. This low leakage ensures minimal impact on power efficiency and signal integrity in battery-powered or low-quiescent-current designs where the SMBJ58CA is deployed.
Can SMBJ58CA be used in parallel to increase surge current handling?
No - SMBJ58CA should not be paralleled to increase surge current capacity. Minor parametric variations between units (e.g., VBR tolerance of ±5%) cause uneven current sharing during transients, leading to thermal runaway in the lower-breakdown unit. Instead, select a higher-power-rated device such as SMCJ58CA (1500 W) or 5.0SMDJ58CA (5000 W) in the same voltage grade. If board space permits, discrete staged protection (e.g., MOV + SMBJ58CA) offers better energy distribution than paralleling identical TVS diodes.
SMBJ58CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 58V
- Voltage - Breakdown (Min):
- 64.4V
- Voltage - Clamping (Max) @ Ipp:
- 93.6V
- Current - Peak Pulse (10/1000µs):
- 6.4A
- 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)
SMBJ58CA FAQ
1.How can I place an order for SMBJ58CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ58CA 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 SMBJ58CA reliable?
The price and inventory of SMBJ58CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ58CA is usually 5 days.
3.What payment methods are accepted for SMBJ58CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ58CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ58CA?
SMBJ58CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ58CA 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 SMBJ58CA?
For technical support, including SMBJ58CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ58CA requirements.
6.How does Aetrix verify that SMBJ58CA is sourced from the original manufacturer or authorized distributors?
All SMBJ58CA 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 SMBJ58CA meets industry standards.
7.What is the process for return or replacement of SMBJ58CA?
All SMBJ58CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ58CA, 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 SMBJ58CA part is unused and in its original packaging.
Return procedure for SMBJ58CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ58CA Tags
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