My Inquiry
My Account
Taiwan Semiconductor Corporation SMBJ11A
- Part No.:
- SMBJ11A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ11A.pdf
- Description:
- TVS DIODE 11VWM 18.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,891
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ11A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a 11 V working stand-off voltage (VWM), 12.2–13.5 V breakdown voltage (VBR), 18.2 V maximum clamping voltage (VC) at 34 A peak pulse current, and 600 W peak pulse power rating with <1.0 ps response time - deployed in automotive infotainment power inputs and industrial PLC I/O modules.
For engineers reviewing the SMBJ11A datasheet, SMBJ11A pinout, SMBJ11A application, or SMBJ11A equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, leakage current at operating voltage, thermal derating above 25°C, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump immunity.
Technical Context
The SMBJ11A uses a glass-passivated silicon junction optimized for fast avalanche response under transient overvoltage events. Its unidirectional configuration provides forward conduction only during reverse-biased surges, with VF = 3.5 V at 50 A for forward surge handling - critical for protecting downstream rectifiers or LDOs during inductive kickback.
Thermal performance is defined by RθJA = 55°C/W and RθJC = 10°C/W, enabling sustained operation up to TJ = +150°C when mounted on ≥1 cm² copper area. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity - suitable for lead-free reflow without popcorn risk.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - Maximum continuous DC or RMS voltage the device blocks without clamping; sets upper limit for protected circuit operating voltage. |
| VBR @ IT=1 mA | 12.2–13.5 V - Voltage at which avalanche conduction begins; ensures reliable turn-on before sensitive ICs exceed absolute max ratings. |
| VC @ IPP=34 A | 18.2 V - Clamped voltage during 10/1000 µs surge; defines worst-case overvoltage seen by downstream components. |
| ID @ VWM | <1 µA - Reverse leakage at rated stand-off; negligible power loss and no measurable impact on low-power sensor bias networks. |
| PPK | 600 W - Peak pulse power handling per 10/1000 µs waveform; supports ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 2b (battery dump). |
| TJ max | +150 °C - Maximum junction temperature; allows operation in under-hood automotive environments with proper PCB thermal relief. |
| Package | DO-214AA (SMB) - Standardized surface-mount outline with cathode band marking; compatible with automated pick-and-place and IPC-7351B footprint. |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band. Weight ≈ 0.090 g. UL 94V-0 rated molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connected to system ground or low-side return; conducts during forward surge (e.g., 8.3 ms half-sine IFSM = 100 A). |
| Cathode | Avalanche clamping node | Connected to protected line (e.g., 12 V rail); enters breakdown when reverse voltage exceeds VBR, shunting surge current to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Clamping performance | VC = 18.2 V at 34 A (10/1000 µs) - limits overvoltage to within 50% of typical 3.3 V/5 V IC absolute max ratings. |
| Response speed | <1.0 ps - faster than most microsecond-scale transients; prevents voltage overshoot before protection activates. |
| Leakage control | ID < 1 µA at 11 V - avoids loading of high-impedance sensor references or battery-monitoring dividers. |
| Automated assembly support | DO-214AA (SMB) footprint and Level 1 moisture sensitivity - enables standard SMT reflow without baking or special handling. |
| Automotive qualification | Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b - validated for 12 V vehicle electrical systems including load-dump and alternator ripple immunity. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protecting 12 V supply input of BCM microcontroller from load-dump transients during battery disconnect/reconnect. IC Role / Device Role / Timing Role: Unidirectional TVS placed between fused 12 V rail and LDO input to clamp surges before regulation. Use Value: Limits clamped voltage to 18.2 V - well below 36 V absolute max rating of common 12 V-input LDOs, preventing latch-up or gate oxide damage. |
Use Scenario: Shielding 24 V digital input optocoupler front-end from inductive kickback when switching solenoid valves. IC Role / Device Role / Timing Role: TVS connected across input terminals to absorb energy from stored magnetic field collapse. Use Value: 600 W peak power rating handles 10/1000 µs pulses up to 34 A - sufficient for 24 V/2 A solenoid with 100 mH inductance. |
| LED Streetlight Power Supply | Medical Diagnostic Sensor Interface |
Use Scenario: Safeguarding AC-DC converter primary-side controller IC against lightning-induced surges on mains input. IC Role / Device Role / Timing Role: TVS installed across bridge rectifier output to clamp differential-mode transients before bulk capacitor. Use Value: 18.2 V clamping ensures MOSFET gate drivers and PWM controllers remain within safe operating area during 1 kV/2 kA surge events. |
Use Scenario: Guarding low-noise analog front-end of ECG amplifier against ESD discharge from operator touch. IC Role / Device Role / Timing Role: TVS placed at connector entry point to divert human-body-model (HBM) ESD pulses away from precision op-amps. Use Value: Sub-1 µA leakage preserves DC offset stability in µV-level biopotential measurements; <1 ps response prevents ESD-induced latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ11A | Same DO-214AC (SMA) package; VC = 18.2 V @ 34 A, but RθJA = 65°C/W vs. SMBJ11A's 55°C/W. | Lower thermal efficiency requires larger copper area for same power dissipation; not drop-in due to different package outline. | Select SMAJ11A only if existing layout uses SMA footprint and thermal margin permits higher RθJA. |
| ON Semiconductor 1.5SMC11A | DO-214AB (SMC) package; VC = 18.2 V @ 34 A, but PPK = 1500 W and ID = 1 µA - identical clamping but higher surge capacity. | Physically larger (7.11 × 6.22 mm vs. SMBJ11A's 4.57 × 3.94 mm); unsuitable for space-constrained layouts. | Choose 1.5SMC11A where board space allows and higher single-pulse robustness is required (e.g., railway traction control). |
Compared with SMBJ11A, SMAJ11A offers identical electrical clamping but reduced thermal performance and non-interchangeable packaging, while 1.5SMC11A delivers higher surge rating at the cost of 2.5× footprint area - making SMBJ11A optimal for compact automotive and industrial PCBs requiring balanced power density and thermal reliability.
Availability
SMBJ11A is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, LED lighting power supplies, and medical sensor interfaces requiring stable component supply across multi-year production cycles.
Supply support for SMBJ11A 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and MOSFETs since 1979.
The SMBJ series was developed specifically for AEC-Q101-compliant automotive and industrial surge protection, emphasizing low clamping voltage, repeatable avalanche behavior, and robust SMT manufacturability in DO-214AA packages.
FAQ
What is the maximum clamping voltage of SMBJ11A under a 10/1000 µs surge?
The SMBJ11A has a maximum clamping voltage (VC) of 18.2 V when subjected to a 10/1000 µs waveform at 34 A peak impulse current. This value is guaranteed per the manufacturer's electrical specifications table and defines the highest voltage that will appear across protected circuitry during such a transient event. The SMBJ11A maintains this clamping performance across its full operating temperature range.
Is SMBJ11A suitable for bidirectional transient protection?
No, SMBJ11A is a unidirectional TVS diode and is not rated for bidirectional operation. For bipolar applications, Taiwan Semiconductor specifies parts with "C" or "CA" suffixes (e.g., SMBJ11CA). Using SMBJ11A in reverse-biased AC signal paths may result in forward conduction and failure; always verify polarity alignment in schematic and layout for SMBJ11A.
What is the forward voltage drop of SMBJ11A during surge conditions?
The SMBJ11A exhibits a forward voltage (VF) of 3.5 V at 50 A for 8.3 ms single half-sine surge, as specified for unidirectional devices in the SMBJ series. This forward conduction capability allows the SMBJ11A to safely handle inductive kickback events on grounded-side circuits, complementing its reverse-biased clamping function.
Does SMBJ11A meet automotive EMC standards?
Yes, SMBJ11A meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), Pulse 3a (capacitive coupled noise), and Pulse 3b (line impedance stabilization network noise). These qualifications are explicitly stated in the product documentation and confirm suitability for 12 V automotive subsystems.
What is the moisture sensitivity level (MSL) of SMBJ11A?
SMBJ11A has a moisture sensitivity level (MSL) of Level 1 per J-STD-020, meaning it can be stored indefinitely at ≤30°C/85% RH and is compatible with standard lead-free reflow profiles without pre-baking. This eliminates handling constraints in high-volume SMT manufacturing and supports immediate placement after dry-pack opening.
SMBJ11A 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:
- 18.2V
- Current - Peak Pulse (10/1000µs):
- 33A
- 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)
SMBJ11A FAQ
1.How can I place an order for SMBJ11A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ11A 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 SMBJ11A reliable?
The price and inventory of SMBJ11A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ11A is usually 5 days.
3.What payment methods are accepted for SMBJ11A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ11A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ11A?
SMBJ11A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ11A 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 SMBJ11A?
For technical support, including SMBJ11A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ11A requirements.
6.How does Aetrix verify that SMBJ11A is sourced from the original manufacturer or authorized distributors?
All SMBJ11A 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 SMBJ11A meets industry standards.
7.What is the process for return or replacement of SMBJ11A?
All SMBJ11A units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ11A, 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 SMBJ11A part is unused and in its original packaging.
Return procedure for SMBJ11A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ11A Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
