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Taiwan Semiconductor Corporation SMBJ120AH
- Part No.:
- SMBJ120AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120AH.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,902
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Product details
Overview
SMBJ120AH from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy surge protection in automotive and industrial power rails. It features a 120 V working stand-off voltage (VWM), 133–147 V breakdown voltage (VBR), 193 V maximum clamping voltage (VC) at 3.2 A peak impulse current (IPP), and 600 W peak pulse power rating with sub-1 ps response time.
For engineers reviewing the SMBJ120AH datasheet, SMBJ120AH pinout, SMBJ120AH application, or SMBJ120AH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, AEC-Q101 qualification status, leakage current ≤1 µA at 120 V, and thermal resistance (RθJA = 55 °C/W) for board-level reliability in 12 V–48 V DC systems.
Technical Context
The SMBJ120AH operates as a unidirectional avalanche diode, activated when reverse voltage exceeds its specified VBR range (133–147 V @ 1 mA). Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA at VWM), critical for maintaining system integrity during standby.
It complies with ISO 7637-2 for automotive transient immunity and supports fast transient suppression with <1 ps response time, enabling protection of downstream MOSFETs, controllers, and CAN/LIN transceivers against load dump and inductive switching events without affecting signal integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 120 V nominal systems. |
| VBR min/max | 133 / 147 V @ 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPP | 193 V @ 3.2 A - Clamped voltage during 10/1000 µs surge; limits stress on protected ICs to ≤193 V under rated 600 W pulse. |
| PPK | 600 W - Peak pulse power handling per 10/1000 µs waveform; supports robust protection against ISO 7637-2 Pulse 5a (load dump). |
| ID @ VWM | <1 µA - Reverse leakage at full stand-off voltage; minimizes quiescent power loss and avoids false triggering in high-impedance circuits. |
| RθJA | 55 °C/W - Junction-to-ambient thermal resistance; enables thermal design for continuous operation up to +125 °C ambient with derating. |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance; UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path; completes clamping loop during overvoltage events. |
| Cathode | Reverse-biased input terminal | Connected to protected line (e.g., battery rail); avalanche conduction initiates here when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood applications including temperature cycling, humidity bias, and mechanical shock per AEC standard. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress without parameter drift. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (capacitive coupling) immunity requirements. |
| Moisture sensitivity level 1 | Zero floor life limitation; no baking required prior to reflow, simplifying SMT assembly and reducing process risk. |
Applications
| Automotive Power Rail Protection | Industrial DC Power Input |
|---|---|
Use Scenario: Protecting 24 V/48 V battery-connected ECUs from load dump transients up to ±120 V. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and upstream fuse or DC-DC converter input. Use Value: Limits peak voltage to 193 V during 600 W surges, preventing damage to automotive-grade microcontrollers and power management ICs. | Use Scenario: Safeguarding programmable logic controllers (PLCs) and motor drives against inductive kickback from solenoids and contactors. IC Role / Device Role / Timing Role: Standoff protection device mounted directly at DIN-rail power entry point, ahead of bulk capacitance. Use Value: Sub-1 ps response ensures clamping occurs before sensitive gate drivers or isolation amplifiers experience overstress. |
| LED Driver Overvoltage Protection | Telecom Power Supply Interface |
Use Scenario: Shielding constant-current LED driver ICs from voltage spikes caused by hot-plug events or cable ESD. IC Role / Device Role / Timing Role: Parallel-connected TVS on output rail, referenced to system ground with low-inductance layout. Use Value: 1 µA leakage at 120 V preserves efficiency in high-precision current regulation while suppressing >1 kV EFT bursts. | Use Scenario: Securing -48 V telecom rectifier outputs against lightning-induced surges entering via distribution cabling. IC Role / Device Role / Timing Role: Primary-stage unidirectional suppressor on DC feed line, coordinated with secondary MOV and filter stages. Use Value: 193 V clamping voltage aligns with -48 V system insulation ratings, enabling IEC 61000-4-5 Level 4 compliance without overdesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120A | Same VWM (120 V), but wider VBR range (133–163 V); higher VC (214 V @ 2.9 A); non-AEC-Q101 qualified. | Acceptable for industrial use where automotive qualification is not required; less precise clamping control. | Select SMBJ120A only if AEC-Q101 compliance is unnecessary and higher clamping voltage is acceptable. |
| SMBJ120CAH | Bidirectional variant (CAH suffix); same VWM (120 V), symmetric VBR (133–147 V), identical VC (193 V @ 3.2 A); AEC-Q101 qualified. | Required for AC-coupled or bipolar signal lines; unsuitable for DC-only unidirectional rails due to dual-direction conduction. | Choose SMBJ120CAH only when protecting bidirectional interfaces such as RS-485 or CAN bus lines. |
Compared with SMBJ120A and SMBJ120CAH, the SMBJ120AH provides tighter VBR tolerance and lower clamping voltage in unidirectional DC applications, making it optimal for automotive battery rail protection where precision and qualification are mandatory.
Availability
SMBJ120AH is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC power inputs, LED driver overvoltage protection, and telecom -48 V interface circuits requiring stable component supply and AEC-Q101 assurance.
Supply support for SMBJ120AH 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 automotive, industrial, and consumer markets.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in harsh automotive environments, emphasizing low leakage, tight VBR tolerance, and robust ISO 7637-2 immunity.
FAQ
What is the clamping voltage of SMBJ120AH and how is it measured?
The SMBJ120AH has a maximum clamping voltage (VC) of 193 V, measured at 3.2 A peak impulse current (IPP) using a 10/1000 µs double-exponential surge waveform. This value is guaranteed across temperature and unit variation per the manufacturer's electrical specifications table and reflects worst-case voltage seen by downstream components during standardized transient events.
Is SMBJ120AH suitable for bidirectional signal lines like CAN or RS-485?
No, SMBJ120AH is unidirectional and intended only for DC power rail protection. For bidirectional interfaces, the SMBJ120CAH variant must be used - it shares the same VWM and clamping performance but conducts symmetrically in both directions, meeting requirements for differential bus protection.
Does SMBJ120AH require special handling or baking before reflow soldering?
No. SMBJ120AH has Moisture Sensitivity Level (MSL) 1 per J-STD-020, meaning it has unlimited floor life and does not require dry-packaging or pre-reflow baking - simplifying SMT assembly and reducing manufacturing overhead.
How does SMBJ120AH differ from standard SMBJ120H in terms of electrical performance?
SMBJ120AH offers tighter breakdown voltage tolerance (133–147 V vs. 133–163 V for SMBJ120H) and lower clamping voltage (193 V vs. 214 V), resulting in improved protection margin for sensitive downstream ICs. Both share the same 600 W PPK rating and AEC-Q101 qualification.
What automotive test standards does SMBJ120AH meet beyond AEC-Q101?
In addition to AEC-Q101 qualification, SMBJ120AH meets ISO 7637-2 for automotive transient immunity, covering Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (capacitive coupling), ensuring robustness in real-world vehicle electrical environments.
SMBJ120AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 193V
- Current - Peak Pulse (10/1000µs):
- 3.2A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ120AH FAQ
1.How can I place an order for SMBJ120AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120AH 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 SMBJ120AH reliable?
The price and inventory of SMBJ120AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ120AH is usually 5 days.
3.What payment methods are accepted for SMBJ120AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120AH?
SMBJ120AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120AH 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 SMBJ120AH?
For technical support, including SMBJ120AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120AH requirements.
6.How does Aetrix verify that SMBJ120AH is sourced from the original manufacturer or authorized distributors?
All SMBJ120AH 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 SMBJ120AH meets industry standards.
7.What is the process for return or replacement of SMBJ120AH?
All SMBJ120AH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120AH, 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 SMBJ120AH part is unused and in its original packaging.
Return procedure for SMBJ120AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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