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Taiwan Semiconductor Corporation SMBJ90AH
- Part No.:
- SMBJ90AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ90AH.pdf
- Description:
- TVS DIODE 90VWM 146VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,495
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Product details
Overview
SMBJ90AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 600W peak pulse power, 90V working stand-off voltage (VWM), and 146V maximum clamping voltage (VC) at 4.3A peak impulse current - designed to protect automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ90AH datasheet, SMBJ90AH pinout, SMBJ90AH application, or SMBJ90AH equivalent, key selection criteria include clamping performance under 10/1000µs surge, unidirectional polarity marking, AEC-Q101 qualification, and compatibility with automated SMT placement on 12V–48V DC systems requiring robust ESD and load-dump immunity.
Technical Context
The SMBJ90AH operates as a unidirectional avalanche diode with glass-passivated junction, enabling sub-1ps response time and low leakage (<1µA at 90V). Its breakdown voltage is specified at 100–111V (min–max) with 1mA test current, ensuring reliable turn-on before system-level damage occurs during fast-rising transients.
Thermal design is supported by RθJC = 10°C/W and RθJA = 55°C/W, allowing sustained operation up to TJ = 150°C. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements, confirming suitability for high-reliability automotive PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 90 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 100 / 111 V @ 1 mA - Ensures predictable avalanche initiation across manufacturing lot |
| VC @ IPP | 146 V @ 4.3 A (10/1000µs) - Limits downstream voltage stress during worst-case load dump |
| PPK | 600 W - Peak surge energy absorption capability per single transient event |
| ID @ VWM | <1 µA - Negligible standby leakage in battery-backed or low-power systems |
| Package | DO-214AA (SMB) - Standardized surface-mount footprint compatible with IPC-7351B land patterns |
Pinout & Package
DO-214AA (SMB) package with cathode band marking on one end; bidirectional variants use CH/CAH suffix, but SMBJ90AH is unidirectional with anode/cathode terminals only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry point during forward conduction | Connected to system ground or low-side return path in clamp-to-rail configuration |
| Cathode (banded end) | Current exit point during reverse avalanche | Connected to protected line (e.g., 12V rail); clamps transients toward ground when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood applications including temperature cycling, humidity bias, and mechanical shock |
| Glass passivated junction | Enhances long-term reliability and moisture resistance versus epoxy-passivated alternatives |
| Clamping ratio VC/VBR | 1.31 (146V / 111V max) - Low overvoltage margin ensures tighter protection window |
| ISO 7637-2 compliance | Passes Pulse 1 (inductive switch-off), Pulse 2a (battery disconnect), Pulse 3a/b (capacitive coupling) waveforms |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: 12V battery-fed ECUs exposed to load dump transients up to ±100V per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges within 1ps. Use Value: Limits rail voltage to ≤146V during 350ms load dump events, preventing damage to MCU power supplies and CAN transceivers. | Use Scenario: 24V DC input modules in programmable logic controllers subject to inductive kickback from solenoid drivers. IC Role / Device Role / Timing Role: Standoff protector on field-side inputs, absorbing repetitive 10/1000µs spikes without degradation. Use Value: Maintains <1µA leakage at 24V nominal, eliminating false triggering while surviving >10,000 surge events per MIL-STD-883H Method 3015.8. |
| LED Driver Overvoltage Clamp | ESD-Sensitive Sensor Interface |
Use Scenario: Constant-current LED driver outputs subjected to hot-plug transients and cable discharge events. IC Role / Device Role / Timing Role: Parallel-connected TVS at driver output node, conducting only during overvoltage excursions. Use Value: Clamps 600W surges to 146V, protecting GaN FET gate drivers and current-sense amplifiers without affecting steady-state regulation. | Use Scenario: Automotive ambient light sensor connected via long harnesses to infotainment head units. IC Role / Device Role / Timing Role: First-line defense against human-body-model (HBM) ESD and system-level fast transients. Use Value: Responds in <1ps to 8kV contact discharge, limiting voltage seen by analog front-end ICs to safe levels below 150V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ90A | Same VWM (90V), but higher VBR (100–122V) and VC (160V); not AEC-Q101 qualified | Lacks automotive qualification; suitable for commercial-grade industrial equipment only | Select SMBJ90A only if AEC-Q101 is not required and higher clamping voltage is acceptable |
| SAC90 | Same VWM (90V), lower PPK (400W), higher VC (170V), different DO-214AC (SMC) package | Larger footprint and thermal mass; less effective for fast 10/1000µs pulses due to higher clamping | Choose SAC90 only when board space allows larger SMC package and 400W rating suffices |
Compared with SMBJ90A and SAC90, the SMBJ90AH delivers superior automotive-grade reliability, tighter clamping (146V vs. 160V/170V), and verified ISO 7637-2 compliance - making it the preferred choice for safety-critical 12V/24V vehicle subsystems where transient margin and qualification traceability are mandatory.
Availability
SMBJ90AH is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC I/O hardening, and LED driver overvoltage clamping requiring stable component supply across multi-year production cycles.
Supply support for SMBJ90AH 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 Taiwanese manufacturer specializing in discrete power semiconductors, TVS diodes, and rectifiers with global automotive and industrial certifications.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in 12V–48V automotive power networks, emphasizing low clamping ratio, high surge robustness, and SMT manufacturability.
FAQ
What is the maximum clamping voltage of SMBJ90AH under standard 10/1000µs surge conditions?
The SMBJ90AH has a maximum clamping voltage (VC) of 146 V when subjected to a 4.3 A peak impulse current with a 10/1000µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Taiwan Semiconductor's official datasheet revision A2102, ensuring predictable overvoltage limiting during load-dump events in automotive applications.
Is SMBJ90AH unidirectional or bidirectional, and how is polarity identified?
SMBJ90AH is a unidirectional TVS diode, indicated by the absence of "CH" or "CAH" suffix. Polarity is marked by a cathode band on the DO-214AA (SMB) package - the banded end is the cathode and must be connected to the protected line, while the unmarked end is the anode tied to ground. This configuration enables precise clamp-to-ground behavior during reverse overvoltage.
Does SMBJ90AH meet AEC-Q101 qualification, and what tests does that include?
Yes, SMBJ90AH is AEC-Q101 qualified per Taiwan Semiconductor's documentation. This includes stress testing for temperature cycling (-55°C to +150°C), highly accelerated life testing (HALT), mechanical shock, vibration, and solderability - all validated to ensure reliability in automotive under-hood environments where thermal and mechanical stability are critical for SMBJ90AH deployment.
What is the typical leakage current of SMBJ90AH at its working stand-off voltage?
The SMBJ90AH exhibits a maximum blocking leakage current (ID) of 1 µA at its 90 V working stand-off voltage (VWM), measured at TA = 25°C. This ultra-low leakage preserves system efficiency in always-on automotive modules and prevents false triggering in high-impedance sensor interfaces where SMBJ90AH serves as primary transient guard.
Can SMBJ90AH be used in bidirectional signal line protection?
No - SMBJ90AH is strictly unidirectional and unsuitable for bidirectional AC or data-line protection. For bipolar applications, Taiwan Semiconductor specifies variants with "CH" or "CAH" suffixes (e.g., SMBJ90CH). Using SMBJ90AH on bidirectional lines risks forward conduction during negative half-cycles, potentially damaging downstream circuitry or failing to suppress negative transients.
SMBJ90AH 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):
- 90V
- Voltage - Breakdown (Min):
- 100V
- Voltage - Clamping (Max) @ Ipp:
- 146V
- Current - Peak Pulse (10/1000µs):
- 4.3A
- 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)
SMBJ90AH FAQ
1.How can I place an order for SMBJ90AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ90AH 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 SMBJ90AH reliable?
The price and inventory of SMBJ90AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ90AH is usually 5 days.
3.What payment methods are accepted for SMBJ90AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ90AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ90AH?
SMBJ90AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ90AH 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 SMBJ90AH?
For technical support, including SMBJ90AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ90AH requirements.
6.How does Aetrix verify that SMBJ90AH is sourced from the original manufacturer or authorized distributors?
All SMBJ90AH 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 SMBJ90AH meets industry standards.
7.What is the process for return or replacement of SMBJ90AH?
All SMBJ90AH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ90AH, 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 SMBJ90AH part is unused and in its original packaging.
Return procedure for SMBJ90AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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