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Taiwan Semiconductor Corporation SMBJ20CA
- Part No.:
- SMBJ20CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20CA.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:13,194
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Product details
Overview
SMBJ20CA from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in DC power lines and signal interfaces. It features a 20 V working stand-off voltage (VWM), 32.4 V maximum clamping voltage (VC) at 19.4 A peak pulse current (IPP), and 600 W peak pulse power rating with <1.0 ps response time - deployed in automotive infotainment power rails and industrial I/O modules.
For engineers reviewing the SMBJ20CA datasheet, SMBJ20CA pinout, SMBJ20CA application, or SMBJ20CA equivalent, key selection criteria include bidirectional clamping symmetry, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, DO-214AA (SMB) package thermal performance (RθJA = 55°C/W), and leakage current ≤1 µA at 20 V.
Technical Context
The SMBJ20CA implements a silicon avalanche diode structure with glass-passivated junction for stable breakdown behavior and low leakage. Its bidirectional configuration enables symmetrical clamping in AC-coupled or floating systems without polarity constraints.
It delivers 600 W non-repetitive peak impulse power under 10/1000 µs waveform, derated above 25°C per JEDEC-standard thermal curves, and maintains clamping voltage ≤32.4 V up to 19.4 A - critical for protecting 24 V industrial controllers against load dump transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR (min/max) | 22.2 V / 24.5 V - Breakdown occurs within this range at 1 mA test current, ensuring reliable turn-on before system damage |
| VC @ IPP | 32.4 V at 19.4 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress below 33 V |
| PPK | 600 W - Peak pulse power handling capability defines survivability against ISO 7637-2 Pulse 5a (load dump) |
| ID @ VWM | ≤1 µA - Ultra-low leakage preserves battery life and signal integrity in always-on circuits |
| TJ max | +150 °C - Enables operation in under-hood automotive or enclosed industrial enclosures |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, bi-directional, cathode band not applicable (symmetrical terminals).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bidirectional) | Surge current path | Both terminals function identically; connects across protected line and ground (or between differential lines) |
| Case | Thermal interface | Exposed copper pad on underside provides primary heat dissipation path to PCB copper pour |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, RS-485 buses, or floating power domains without polarity concerns |
| ISO 7637-2 compliance | Validated for automotive electrical transient immunity (Pulse 1, 2a, 2b, 3a, 3b), supporting AEC-Q101 prequalification |
| Moisture sensitivity level 1 | Eliminates bake requirements prior to reflow, reducing manufacturing cost and process complexity |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained applications |
Applications
| Automotive Power Rail Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting 24 V supply inputs in vehicle body control modules against load dump and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed between VBAT and chassis ground to clamp surges up to ±120 V. Use Value: Limits clamped voltage to 32.4 V, preventing damage to downstream 36 V-rated DC-DC converters and microcontrollers. |
Use Scenario: Shielding RS-485 transceivers in factory automation PLCs from EFT bursts and cable-induced surges. IC Role / Device Role / Timing Role: Placed differentially across A/B lines and common-mode to ground to suppress fast transients without distorting data eye. Use Value: Sub-1 ps response ensures clamping initiates before 10 ns EFT edges propagate into receiver input stages. |
| LED Driver Overvoltage Clamp | Smart Meter AC Mains Input |
Use Scenario: Safeguarding constant-current LED drivers in streetlight systems exposed to lightning-induced surges on 48 V DC bus. IC Role / Device Role / Timing Role: Connected line-to-ground on output side to absorb repetitive switching spikes and external transients. Use Value: 600 W PPK rating sustains repeated 10/1000 µs events without degradation, extending field lifetime beyond 10 years. |
Use Scenario: Front-end protection of revenue-grade smart meters connected to 230 V AC mains via bridge rectifier. IC Role / Device Role / Timing Role: Mounted after rectification to clamp residual surges on DC link before metering IC and isolated communication ICs. Use Value: 20 V VWM aligns with typical DC link voltage post-rectification (~325 V peak → ~200–220 V DC), enabling precise threshold setting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ20CA | Same DO-214AA package, identical VWM (20 V), but VC = 32.5 V at 19.4 A - 0.1 V higher clamping | Compatible in all SMBJ20CA designs; minor clamping variance does not affect 36 V system margin | Select when dual-sourcing required; identical footprint and thermal profile |
| ON Semiconductor SMCJ20CA | DO-214AB (SMC) package - larger footprint (7.11 × 6.22 mm vs. SMB's 4.57 × 3.94 mm) and higher PPK (1500 W) | Not drop-in; requires PCB layout change; suited for higher-energy threats where space allows | Choose only if system-level testing confirms need for >600 W surge handling and board area permits SMC |
Compared with SMBJ20CA, SMAJ20CA offers identical mechanical and electrical fit with negligible clamping difference, while SMCJ20CA trades compactness for higher surge capacity - making SMBJ20CA optimal for space-constrained 24 V industrial and automotive nodes where 600 W suffices.
Availability
SMBJ20CA is available at Aetrix Electronics and suitable for automotive body electronics, industrial RS-485 networks, and LED driver power supplies requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ20CA 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers, with ISO/TS 16949 and ISO 14001 certifications.
The SMBJ series was developed for high-reliability transient suppression in automotive and industrial environments, emphasizing robustness against ISO 7637-2 pulses, low leakage, and automated assembly compatibility.
FAQ
What is the maximum clamping voltage of SMBJ20CA under standard surge conditions?
The SMBJ20CA has a maximum clamping voltage (VC) of 32.4 V when subjected to a 10/1000 µs waveform at 19.4 A peak pulse current (IPP), as specified in Taiwan Semiconductor's R2104 datasheet. This value ensures protected circuits remain below critical 36 V thresholds during transient events, and SMBJ20CA maintains this performance across its full operating temperature range of –55 °C to +150 °C.
Is SMBJ20CA unidirectional or bidirectional, and how does that affect circuit placement?
SMBJ20CA is a bidirectional TVS diode, indicated by the "CA" suffix, meaning it clamps symmetrically for both positive and negative transients. Unlike unidirectional variants (e.g., SMBJ20A), SMBJ20CA requires no polarity alignment during placement - it can be installed across any two points needing balanced overvoltage protection, such as differential data lines or floating power domains. This simplifies layout and eliminates orientation errors in automated assembly.
Does SMBJ20CA meet automotive transient immunity standards?
Yes, SMBJ20CA meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), Pulse 3a (capacitive coupled EFT), and Pulse 3b (inductive coupled EFT). Taiwan Semiconductor explicitly lists this compliance in the FEATURES section of the SMBJ series datasheet (R2104), confirming SMBJ20CA's suitability for automotive ECUs, infotainment systems, and body control modules.
What is the leakage current specification for SMBJ20CA at its working voltage?
SMBJ20CA exhibits a maximum blocking leakage current (ID) of 1 µA when biased at its 20 V working stand-off voltage (VWM), measured at 25 °C. This ultra-low leakage supports energy-sensitive applications like battery-backed sensors and always-on monitoring circuits, and SMBJ20CA maintains ≤5 µA leakage even at +125 °C per thermal derating curves in the datasheet.
Can SMBJ20CA be used in place of SMBJ20A in an existing design?
SMBJ20CA and SMBJ20A are not interchangeable without verification: SMBJ20A is unidirectional (anode-cathode asymmetry), while SMBJ20CA is bidirectional (symmetrical). Replacing SMBJ20A with SMBJ20CA in a DC-biased rail may cause unintended conduction if forward voltage exceeds VF. However, SMBJ20CA can directly replace SMBJ20C (its bidirectional counterpart) - always confirm circuit topology and polarity requirements before substitution. SMBJ20CA's marking code is "LV" per the datasheet.
SMBJ20CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 2
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 18.6A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ20CA FAQ
1.How can I place an order for SMBJ20CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20CA 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 SMBJ20CA reliable?
The price and inventory of SMBJ20CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20CA is usually 5 days.
3.What payment methods are accepted for SMBJ20CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20CA?
SMBJ20CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20CA 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 SMBJ20CA?
For technical support, including SMBJ20CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20CA requirements.
6.How does Aetrix verify that SMBJ20CA is sourced from the original manufacturer or authorized distributors?
All SMBJ20CA 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 SMBJ20CA meets industry standards.
7.What is the process for return or replacement of SMBJ20CA?
All SMBJ20CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20CA, 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 SMBJ20CA part is unused and in its original packaging.
Return procedure for SMBJ20CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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