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Taiwan Semiconductor Corporation SMBJ11
- Part No.:
- SMBJ11
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ11.pdf
- Description:
- 600W, 13.6V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:5,220
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Product details
Overview
SMBJ11 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power lines and signal interfaces. It features a 11 V working stand-off voltage, 12.2–14.9 V breakdown voltage at 1 mA test current, 20.1 V maximum clamping voltage at 31 A peak pulse current, and 600 W peak pulse power rating per 10/1000 µs waveform - deployed in automotive power supply rails and industrial I/O protection.
For engineers reviewing the SMBJ11 datasheet, SMBJ11 pinout, SMBJ11 application, or SMBJ11 equivalent, key selection criteria include clamping voltage margin versus protected IC VDD, leakage current at operating voltage, thermal derating above 25°C ambient, and DO-214AA (SMB) footprint compatibility with IPC-7351B layout standards.
Technical Context
The SMBJ11 operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold while blocking forward current up to 3.5 V at 50 A. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1 µA at 11 V), meeting ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity requirements for automotive electronics.
Thermal performance is defined by RθJC = 10 °C/W and RθJA = 55 °C/W, enabling reliable operation up to +150 °C junction temperature. The device uses a single-die DO-214AA (SMB) package with matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - Maximum continuous reverse operating voltage before significant leakage begins; sets upper limit for protected circuit's nominal DC rail. |
| VBR @ IT=1 mA | 12.2–14.9 V - Breakdown voltage range defining turn-on threshold; ensures robust margin over VWM to avoid false triggering. |
| VC @ IPP=31 A | 20.1 V - Clamping voltage during 10/1000 µs surge; determines maximum stress imposed on downstream ICs during ESD/EFT events. |
| PPK | 600 W - Peak pulse power handling capability; supports transient energy absorption without failure under standardized surge waveforms. |
| IPP | 31 A - Maximum non-repetitive peak impulse current; defines surge current capacity before thermal runaway or junction damage. |
| ID @ VWM | <1 µA - Reverse blocking leakage at rated stand-off voltage; critical for low-power battery-backed systems and precision analog front-ends. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-diode configuration with cathode band marking. Dimensions conform to JEDEC DO-214AA standard; recommended pad layout provided in Taiwan Semiconductor Package Outline Drawings.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential node in unidirectional TVS configuration; carries surge current to ground during clamping. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12 V rail); avalanche breakdown occurs here when transient exceeds VBR, shunting energy to anode. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance (±5% typical), low parameter drift over temperature, and long-term reliability in humid environments. |
| Fast response time <1.0 ps | Enables effective suppression of nanosecond-scale ESD transients before sensitive ICs experience overstress. |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Validated for automotive load-dump and inductive-switching immunity testing - suitable for 12 V/24 V vehicle subsystems. |
| RoHS & halogen-free compliance | Fulfills EU RoHS Directive 2011/65/EU and IEC 61249-2-21, supporting environmentally constrained industrial and consumer designs. |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting 12 V power input of body control module against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and chassis ground to clamp surges >20 V while remaining inactive during normal operation. Use Value: Limits peak voltage to 20.1 V during 31 A transients, preventing damage to LDO regulators and microcontroller power pins rated for 28 V absolute max. | Use Scenario: Shielding 24 V digital input channels of programmable logic controller against field-wiring induced transients. IC Role / Device Role / Timing Role: Standoff protection element mounted at connector entry point, absorbing fast EFT bursts per IEC 61000-4-4 Level 4. Use Value: Clamps 4 kV EFT pulses within 1 ps, maintaining signal integrity and avoiding false edge detection in optocoupled input stages. |
| LED Driver Output Protection | RS-485 Transceiver Bus Line Protection |
Use Scenario: Safeguarding constant-current LED driver output against inductive kickback from disconnected loads. IC Role / Device Role / Timing Role: TVS connected across driver output and return, activated only during abnormal open-circuit switching events. Use Value: Absorbs 600 W peak energy from 100 µs inductive spikes, eliminating need for snubber RC networks and reducing BOM count. | Use Scenario: Protecting RS-485 transceiver A/B bus lines in factory automation networks exposed to ground potential differences. IC Role / Device Role / Timing Role: Bidirectional-capable variant (SMBJ11C) used in differential pair protection; SMBJ11 serves as single-line reference in asymmetric layouts. Use Value: Maintains <1 µA leakage at 11 V, preserving common-mode voltage margin and preventing false idle-state interpretation on half-duplex buses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ11A | Narrower VBR range (12.2–13.5 V vs. 12.2–14.9 V); lower clamping voltage (18.2 V vs. 20.1 V) at same IPP. | Better suited for tighter voltage-margin designs where 1.9 V lower clamping improves IC survivability. | Select SMBJ11A when protecting 13.3 V-rated components; SMBJ11 remains preferred for general-purpose 12 V rail hardening with higher VBR tolerance. |
| SMAJ11 | Lower PPK (400 W vs. 600 W); same DO-214AC (SMA) package but smaller thermal mass and higher RθJA (70 °C/W). | Limited to lower-energy transients; not qualified for ISO 7637-2 Pulse 2b or 3b. | Use SMAJ11 only in cost-sensitive, space-constrained consumer applications with sub-20 A surge exposure; SMBJ11 required for automotive-grade immunity. |
Compared with SMBJ11A and SMAJ11, the SMBJ11 offers broader VBR tolerance for manufacturing variation, higher surge energy handling for harsh environments, and full ISO 7637-2 compliance - making it the default choice for industrial and automotive power line protection where reliability outweighs marginal cost savings.
Availability
SMBJ11 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC I/O hardening, and LED driver output safeguarding requiring stable component supply across extended production lifecycles.
Supply support for SMBJ11 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, rectifiers, and MOSFETs for industrial, automotive, and consumer markets.
The SMBJ series was developed to deliver high-power, surface-mount transient suppression in compact DO-214AA packages - targeting design-in opportunities in automotive electronics, industrial controls, and lighting systems demanding AEC-Q200 alignment and ISO 7637-2 compliance.
FAQ
What is the polarity configuration of SMBJ11?
The SMBJ11 is a unidirectional TVS diode, with cathode marked by a band on the DO-214AA (SMB) package body. It conducts in reverse bias above VBR and blocks forward current up to 3.5 V at 50 A. This configuration suits DC power line protection where polarity is fixed, unlike bidirectional variants (e.g., SMBJ11C) used in AC or differential signal paths. Always verify orientation during PCB layout to ensure correct clamping behavior for the SMBJ11.
Does SMBJ11 meet automotive EMC standards?
Yes, the SMBJ11 meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements for electrical disturbances in road vehicles. Its 600 W peak pulse power rating, controlled clamping voltage (20.1 V), and fast response (<1.0 ps) enable compliance with load dump, supply interruption, and coupled transient immunity tests. Taiwan Semiconductor validates this performance per ANSI/IEEE C62.35, confirming suitability for 12 V and 24 V automotive subsystems using the SMBJ11.
What is the maximum junction temperature for SMBJ11?
The SMBJ11 has a maximum junction temperature (TJ) of +150 °C, with storage temperature ranging from –55 °C to +150 °C. Thermal performance is characterized by RθJC = 10 °C/W and RθJA = 55 °C/W, allowing safe operation at full 600 W pulse power only at TA ≤ 25 °C - derating required per Figure 2 in the datasheet. For sustained high-temperature environments, thermal relief via copper pour and airflow must be verified to prevent exceeding the SMBJ11's TJ limit.
How does SMBJ11 compare to SMBJ11A in clamping performance?
The SMBJ11 clamps at 20.1 V under 31 A (10/1000 µs), while the SMBJ11A clamps at 18.2 V under 34 A - a 1.9 V lower clamping voltage with slightly higher surge current capacity. This difference arises from tighter VBR specification (12.2–13.5 V vs. 12.2–14.9 V), yielding more predictable turn-on. For circuits with narrow voltage margins (e.g., protecting 13.3 V-rated ICs), the SMBJ11A provides superior protection; the SMBJ11 remains optimal where process variation tolerance is prioritized over minimal clamping overshoot.
Is SMBJ11 compatible with lead-free reflow soldering processes?
Yes, the SMBJ11 uses matte tin-plated leads qualified per J-STD-002 for solderability and complies with RoHS Directive 2011/65/EU. Its DO-214AA (SMB) package supports standard lead-free reflow profiles (peak temperature ≤ 260 °C, 60–90 s above 217 °C), and the molding compound meets UL 94V-0 flammability rating. Moisture sensitivity level is rated at Level 1 per J-STD-020, eliminating bake requirements prior to assembly - ensuring robust manufacturability for the SMBJ11 in high-volume SMT lines.
SMBJ11 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 20.1V
- Current - Peak Pulse (10/1000µs):
- 31A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ11 FAQ
1.How can I place an order for SMBJ11 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ11 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 SMBJ11 reliable?
The price and inventory of SMBJ11 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ11 is usually 5 days.
3.What payment methods are accepted for SMBJ11?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ11 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ11?
SMBJ11 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ11 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 SMBJ11?
For technical support, including SMBJ11 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ11 requirements.
6.How does Aetrix verify that SMBJ11 is sourced from the original manufacturer or authorized distributors?
All SMBJ11 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 SMBJ11 meets industry standards.
7.What is the process for return or replacement of SMBJ11?
All SMBJ11 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ11, 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 SMBJ11 part is unused and in its original packaging.
Return procedure for SMBJ11:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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