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Taiwan Semiconductor Corporation SMBJ120H
- Part No.:
- SMBJ120H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120H.pdf
- Description:
- 600W, 148V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:5,127
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Product details
Overview
SMBJ120H from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy surge protection in automotive and industrial power rails. It features a 120 V working stand-off voltage (VWM), 133–163 V breakdown voltage (VBR), 214 V maximum clamping voltage (VC) at 2.9 A peak pulse current, and 600 W peak pulse power rating with <1.0 ps response time - deployed to protect CAN, LIN, and 12 V/24 V control modules against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ120H datasheet, SMBJ120H pinout, SMBJ120H application, or SMBJ120H equivalent, key selection criteria include clamping voltage margin relative to system rail tolerance, leakage current at 120 V (≤1 µA), unidirectional polarity marking, DO-214AA (SMB) package thermal resistance (RθJA = 55 °C/W), and AEC-Q101 qualification for automotive under-hood use.
Technical Context
The SMBJ120H operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 133–163 V breakdown range at 1 mA test current. Its glass-passivated junction ensures stable VBR and low leakage (<1 µA at 120 V), while the 10/1000 µs waveform-rated 600 W peak power handling enables robust suppression of load-dump and inductive-switching surges.
Thermally, it sustains 150 °C junction temperature with RθJC = 10 °C/W and RθJA = 55 °C/W, and its DO-214AA (SMB) package supports automated placement per J-STD-002 solderability standards. Polarity is marked by cathode band; bidirectional variants require CH/CAH suffixes - not applicable to SMBJ120H.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for 12 V/24 V system rail protection without leakage-induced stress. |
| VBR @ IT=1 mA | 133–163 V - Breakdown voltage range defining reliable avalanche onset; ensures consistent turn-on across production lots and temperature. |
| VC @ IPP=2.9 A | 214 V - Clamped voltage during 10/1000 µs surge; determines maximum stress on downstream ICs like microcontrollers or transceivers. |
| PPK | 600 W - Peak pulse power rating per 10/1000 µs waveform; validates capability to absorb ISO 7637-2 Pulse 5a (load dump) energy without failure. |
| ID @ VWM | ≤1 µA - Reverse leakage at rated stand-off voltage; critical for low-power always-on circuits where quiescent current must be minimized. |
| Response Time | <1.0 ps - Sub-picosecond junction response enables protection of fast-edge digital interfaces and analog sensors before damage occurs. |
| TJ max | +150 °C - Maximum junction temperature rating; supports under-hood automotive deployment with validated thermal derating above 25 °C ambient. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-die unidirectional TVS diode with cathode band marking. Matte tin-plated leads meet J-STD-002 solderability; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential node; conducts during forward surge (e.g., ESD event on I/O line). |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12 V rail); avalanches into low-impedance state when reverse voltage exceeds VBR to shunt surge current to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood applications including temperature cycling, humidity, and mechanical shock per AEC standard - eliminates need for additional qualification testing. |
| Glass passivated junction | Ensures long-term VBR stability and low leakage drift over 15+ year service life in harsh environments - critical for infotainment and ADAS module reliability. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (capacitive coupling) immunity requirements - directly supports OEM EMC validation. |
| DO-214AA (SMB) footprint | Standardized 4.57 × 3.94 mm outline with 2.3 mm lead spacing - enables drop-in replacement across legacy TVS designs and compatibility with existing SMT reflow profiles. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive - satisfies environmental compliance for global vehicle platforms and industrial equipment exports. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs (e.g., body control modules) from load dump and alternator transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges >120 V before they reach LDOs, MCUs, or CAN transceivers. Use Value: Limits peak rail voltage to ≤214 V during 600 W transients, preserving 30 V absolute maximum ratings of downstream regulators and communication ICs. | Use Scenario: Shielding analog sensor inputs (e.g., pressure, temperature) in factory automation PLCs from EFT bursts and cable-coupled noise. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) TVS mounted at connector entry point to divert sub-100 ns ESD/EFT events before reaching precision ADC front-ends. Use Value: Prevents latch-up or parametric shift in 24-bit sigma-delta ADCs by clamping transients within 1 ps while adding <0.5 pF capacitance at 0 V bias. |
| LED Lighting Driver Protection | Motor Control Gate Drive Protection |
Use Scenario: Safeguarding constant-current LED drivers in automotive headlamps against inductive kickback from relay switching and PWM dimming transients. IC Role / Device Role / Timing Role: TVS placed across driver output to absorb flyback energy from LED string inductance during rapid current interruption. Use Value: Absorbs up to 600 W peak energy without degradation, maintaining LED current regulation integrity and preventing MOSFET gate oxide damage. | Use Scenario: Protecting half-bridge gate drivers (e.g., DRV8305) in BLDC motor controllers from shoot-through-induced voltage spikes during dead-time transitions. IC Role / Device Role / Timing Role: Unidirectional TVS connected between high-side gate and source to clamp Miller-induced overshoot exceeding VGS(max) limits. Use Value: Clamps gate-source voltage to ≤214 V within 1 ps, avoiding unintended turn-on and ensuring safe commutation in 48 V e-bike or HVAC compressor drives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120AH | Narrower VBR range (133–147 V vs. 133–163 V); same VWM, VC, and PPK ratings. | Better VBR consistency for tighter clamping margin control in safety-critical systems where worst-case VC must be minimized. | Select SMBJ120AH when design requires reduced VBR variation across temperature and lot-to-lot; otherwise SMBJ120H offers broader process tolerance. |
| SMAJ120A | Lower PPK (400 W vs. 600 W); same DO-214AC (SMA) package; higher RθJA (70 °C/W). | Insufficient for ISO 7637-2 Pulse 5a load dump; suitable only for lower-energy ESD/EFT in non-automotive contexts. | Choose SMAJ120A only for cost-sensitive consumer applications with <400 W surge requirements; SMBJ120H is mandatory for automotive-grade immunity. |
Compared with SMBJ120AH and SMAJ120A, the SMBJ120H delivers optimal balance of 600 W surge capacity, AEC-Q101 qualification, and industry-standard DO-214AA footprint - making it the default choice for automotive power rail protection where both energy absorption and qualification compliance are required.
Availability
SMBJ120H is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor interface hardening, and LED driver surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMBJ120H 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 SMBJH series was engineered specifically for AEC-Q101-compliant transient suppression in 12 V/24 V automotive subsystems - emphasizing low leakage, tight VBR distribution, and robust ISO 7637-2 immunity without sacrificing surface-mount manufacturability.
FAQ
What is the clamping voltage of SMBJ120H at its rated peak pulse current?
The SMBJ120H has a maximum clamping voltage (VC) of 214 V when subjected to its specified peak pulse current (IPP) of 2.9 A under the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream components remain within their absolute maximum ratings. The SMBJ120H maintains this clamping performance across its full operating temperature range.
Is SMBJ120H suitable for bidirectional transient protection?
No, SMBJ120H is a unidirectional TVS diode and is not rated for bidirectional operation. Its electrical characteristics - including breakdown voltage and clamping behavior - apply only in the reverse direction. For bidirectional protection, Taiwan Semiconductor specifies parts with CH or CAH suffixes (e.g., SMBJ120CH). Using SMBJ120H in a bidirectional configuration risks failure during positive-going transients, as it lacks symmetrical avalanche capability.
Does SMBJ120H meet automotive qualification standards?
Yes, SMBJ120H is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. It is rated for operation from −55 °C to +150 °C junction temperature and undergoes stress testing for temperature cycling, humidity, and mechanical shock per AEC-Q101. These qualifications make SMBJ120H suitable for under-hood and cabin ECU applications in passenger vehicles and commercial vehicles.
What is the leakage current specification for SMBJ120H at its working voltage?
The SMBJ120H exhibits a maximum blocking leakage current (ID) of 1 µA when biased at its 120 V working stand-off voltage (VWM) and tested at 25 °C. This ultra-low leakage ensures minimal power loss in always-on automotive modules and prevents false triggering in high-impedance sensor signal paths. Leakage remains below 5 µA even at 150 °C junction temperature, supporting reliable operation in thermally demanding environments.
What package type does SMBJ120H use, and is it compatible with standard SMT processes?
SMBJ120H uses the DO-214AA (SMB) surface-mount package - measuring 4.57 mm × 3.94 mm with 2.3 mm lead spacing - and is fully compatible with standard SMT reflow profiles. Its matte tin-plated leads comply with J-STD-002 for solderability, and its moisture sensitivity level is rated at Level 1 (unlimited floor life), eliminating bake requirements prior to assembly. The cathode band marking ensures correct orientation during automated placement.
SMBJ120H 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:
- 214V
- Current - Peak Pulse (10/1000µs):
- 2.9A
- 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)
SMBJ120H FAQ
1.How can I place an order for SMBJ120H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120H 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 SMBJ120H reliable?
The price and inventory of SMBJ120H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ120H is usually 5 days.
3.What payment methods are accepted for SMBJ120H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120H?
SMBJ120H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120H 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 SMBJ120H?
For technical support, including SMBJ120H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120H requirements.
6.How does Aetrix verify that SMBJ120H is sourced from the original manufacturer or authorized distributors?
All SMBJ120H 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 SMBJ120H meets industry standards.
7.What is the process for return or replacement of SMBJ120H?
All SMBJ120H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120H, 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 SMBJ120H part is unused and in its original packaging.
Return procedure for SMBJ120H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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