My Inquiry
My Account
Taiwan Semiconductor Corporation SMB10J12AH
- Part No.:
- SMB10J12AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB10J12AH.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,178
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMB10J12AH from Taiwan Semiconductor is a unidirectional 1000W surface-mount transient voltage suppressor (TVS) diode with a 12V stand-off voltage (VWM), 13.3–14.7V breakdown voltage (VBR), and 19.9V clamping voltage (VC) at 50.3A peak pulse current; designed for automotive-grade ESD and load-dump protection in lighting control and power supply input stages.
For engineers reviewing the SMB10J12AH datasheet, SMB10J12AH pinout, SMB10J12AH application, or SMB10J12AH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, AEC-Q101 qualification status, DO-214AA (SMB) package thermal resistance (RθJL = 20°C/W), and unidirectional polarity marking.
Technical Context
This TVS diode employs a glass-passivated silicon junction optimized for sub-nanosecond response (<1.0 ps) and low dynamic impedance to limit transient overvoltage before sensitive downstream circuitry is stressed. Its unidirectional configuration provides reverse-biased clamping only, with forward conduction limited to 3.5V at 50A.
Rated for 175°C maximum junction temperature and compliant with JESD201 Class 2 whisker resistance, SMB10J12AH supports high-reliability automotive applications where moisture sensitivity (MSL Level 1) and UL 94V-0 molding compound are mandatory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before leakage exceeds 5 µA |
| VBR (min/max) | 13.3 / 14.7 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold |
| VC @ IPPM | 19.9 V - Clamped voltage seen by protected circuit during 50.3 A 10/1000 µs surge |
| PPK | 1000 W - Peak pulse power handling capability per single non-repetitive 1 ms event |
| RθJL | 20 °C/W - Junction-to-lead thermal resistance enables effective heat transfer to PCB copper |
| TJ max | +175 °C - Maximum allowable junction temperature supports under-hood automotive placement |
Pinout & Package
DO-214AA (SMB) surface-mount package: cathode-banded end denotes terminal 1 (cathode); anode is unmarked end. Matte tin-plated leads comply with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Clamps reverse transients by conducting to ground when voltage exceeds VBR; polarity-sensitive installation required |
| Anode (unmarked end) | Reference node / return path | Connected to system ground or low-impedance return; completes clamping loop during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, mechanical shock, and humidity testing per stress test standard |
| Clamping voltage ≤19.9 V @ 50.3 A | Ensures protected ICs (e.g., CAN transceivers, MCU I/O) remain below absolute maximum ratings during ISO 7637-2 Pulse 2b |
| Response time <1.0 ps | Activates before most fast-rising ESD or inductive spikes propagate into signal paths |
| Moisture Sensitivity Level 1 | Zero bake requirement prior to reflow; compatible with standard SMT assembly lines without dry-pack handling |
| UL 94V-0 molding compound | Self-extinguishing encapsulant meets automotive flammability requirements for under-hood modules |
Applications
| Automotive Lighting Control | Industrial Power Supply Input |
|---|---|
Use Scenario: Protecting LED driver ICs from load-dump transients generated by alternator disconnection in 12V vehicle systems. IC Role / Device Role: Unidirectional TVS placed across input rails to clamp reverse-polarity surges up to 1000W. Use Value: Limits voltage to ≤19.9V during 50.3A pulses, preventing latch-up or gate oxide damage in buck controller ICs. | Use Scenario: Safeguarding AC-DC converter primary-side controllers against switching-induced voltage spikes on DC bus lines. IC Role / Device Role: Transient suppression at rectifier output to prevent overvoltage shutdown of PWM ICs. Use Value: Fast <1.0 ps response ensures clamping initiates before spike amplitude exceeds 20V, preserving regulation stability. |
| Automotive Body Control Module (BCM) | Commercial HVAC Control Board |
Use Scenario: Shielding LIN bus transceivers and microcontroller I/O pins from ESD and electrical fast transients in door module assemblies. IC Role / Device Role: Localized TVS on each protected line, leveraging DO-214AA's low-profile footprint for dense PCB layouts. Use Value: AEC-Q101 qualification and MSL Level 1 enable direct integration into automated SMT lines without process derating. | Use Scenario: Protecting relay driver MOSFETs and optocoupler inputs from inductive kickback when controlling fan motors or dampers. IC Role / Device Role: Bidirectional clamping not required; unidirectional SMB10J12AH suffices for DC-side suppression with defined polarity. Use Value: 12V VWM aligns with 12V control rail nominal, while 19.9V VC ensures MOSFET VDS rating margin remains intact during 1000W surges. |
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 SMAJ12A | Same DO-214AC (SMA) package; 12V VWM, 21.2V VC @ 47.2A; RθJA = 110°C/W vs. SMB10J12AH's 100°C/W | Lower peak pulse current rating (47.2A vs. 50.3A); slightly higher clamping voltage reduces margin for 3.3V/5V logic protection | Preferred where SMA footprint already used; verify thermal layout supports higher RθJA |
| ON Semiconductor 1.5SMC12A | DO-214AB (SMC) package; 12V VWM, 19.9V VC @ 50.3A; same clamping but larger footprint (7.11 × 6.22 mm vs. SMB's 4.57 × 3.94 mm) | Higher steady-state power dissipation (5W vs. SMB10J12AH's 5W) but requires more board area; not suitable for space-constrained automotive modules | Select when board real estate allows larger SMC package and higher thermal mass is beneficial |
Compared with SMAJ12A and 1.5SMC12A, SMB10J12AH delivers identical clamping performance in the smallest footprint (DO-214AA), with AEC-Q101 qualification and MSL Level 1 making it optimal for automotive SMT production where space, reliability, and process compatibility are critical.
Availability
SMB10J12AH is available at Aetrix Electronics and suitable for automotive lighting control, industrial power supply input protection, and body control module (BCM) designs requiring stable component supply, AEC-Q101 compliance, and DO-214AA packaging.
Supply support for SMB10J12AH 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 power MOSFETs for automotive and industrial markets.
The SMB10JxxAH series was developed specifically to meet stringent ISO 7637-2 and AEC-Q101 requirements for 12V automotive systems, emphasizing low-clamp voltage, fast response, and robust thermal performance in compact surface-mount packages.
FAQ
What is the clamping voltage of SMB10J12AH and how is it measured?
The SMB10J12AH has a maximum clamping voltage (VC) of 19.9 V, measured at a peak pulse current (IPPM) of 50.3 A using the standardized 10/1000 µs double-exponential waveform. This value represents the highest voltage the device allows across its terminals during a transient event, ensuring downstream components remain within safe operating limits. The test condition is explicitly defined in the TSC datasheet Version A2102.
Is SMB10J12AH suitable for bidirectional transient protection?
No, SMB10J12AH is a unidirectional TVS diode intended for reverse-biased clamping only. For bidirectional protection, the SMB10J12CAH variant must be used - it features symmetrical breakdown in both polarities and is marked with "LEC" for unidirectional or "LEC" + "C" suffix for bidirectional versions. Using SMB10J12AH in bidirectional circuits risks failure during positive transients.
Does SMB10J12AH require special handling during PCB assembly?
No special handling is required: SMB10J12AH is rated MSL Level 1 per J-STD-020, meaning it can be stored indefinitely at ambient conditions and placed directly into standard lead-free reflow profiles without baking. Its matte tin-plated leads meet J-STD-002 solderability requirements, supporting high-yield automated placement and reflow in automotive manufacturing environments.
What automotive standards does SMB10J12AH comply with?
SMB10J12AH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b for transient immunity in 12V automotive systems. It also complies with RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21, satisfying Tier 1 supplier environmental and reliability mandates.
How does the thermal performance of SMB10J12AH compare to similar TVS diodes?
SMB10J12AH offers RθJL = 20°C/W (junction-to-lead) and RθJA = 100°C/W (junction-to-ambient), enabling efficient heat transfer to PCB copper pads. This outperforms many DO-214AC (SMA) alternatives like SMAJ12A (RθJA = 110°C/W), allowing higher sustained surge duty cycles in thermally constrained layouts without derating.
SMB10J12AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMB10J
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 50.3A
- Power - Peak Pulse:
- 1000W (1kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB10J12AH FAQ
1.How can I place an order for SMB10J12AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB10J12AH 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 SMB10J12AH reliable?
The price and inventory of SMB10J12AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB10J12AH is usually 5 days.
3.What payment methods are accepted for SMB10J12AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB10J12AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB10J12AH?
SMB10J12AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB10J12AH 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 SMB10J12AH?
For technical support, including SMB10J12AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB10J12AH requirements.
6.How does Aetrix verify that SMB10J12AH is sourced from the original manufacturer or authorized distributors?
All SMB10J12AH 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 SMB10J12AH meets industry standards.
7.What is the process for return or replacement of SMB10J12AH?
All SMB10J12AH units undergo pre-shipment inspection (PSI). If there is an issue with SMB10J12AH, 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 SMB10J12AH part is unused and in its original packaging.
Return procedure for SMB10J12AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB10J12AH 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…
