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Taiwan Semiconductor Corporation SMAJ90
- Part No.:
- SMAJ90
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ90.pdf
- Description:
- 300W, 111V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:4,228
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Product details
Overview
SMAJ90 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection in DC power lines. It features a 90 V working stand-off voltage (VWM), 100–122 V breakdown voltage (VBR), 160 V maximum clamping voltage (VC) at 1.9 A peak impulse current (IPPM), and 400 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMAJ90 datasheet, SMAJ90 pinout, SMAJ90 application, or SMAJ90 equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b transients, junction temperature range (−55 °C to +150 °C), moisture sensitivity level 1 compliance, and compatibility with automated SMT placement on power rails in automotive and industrial converters.
Technical Context
The SMAJ90 operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its specified VBR range (100–122 V @ 1 mA test current). Its fast response time (<1.0 ps from 0 V to VBR min) ensures suppression of nanosecond-scale transients before downstream circuitry is stressed.
It delivers 400 W peak pulse power (10/1000 µs) at 25 °C, derated linearly above ambient temperature per Fig.2, and maintains <1 µA reverse leakage at VWM = 90 V. The device uses glass-passivated junction technology and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 90 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 100 / 122 V @ 1 mA - Confirmed avalanche initiation window for reliable overvoltage thresholding |
| VC @ IPPM | 160 V @ 1.9 A - Clamped voltage during full 10/1000 µs surge, limiting stress on protected ICs |
| PPPM | 400 W (10/1000 µs) - Peak transient energy absorption capacity without failure |
| IR @ VWM | <1 µA - Negligible standby leakage, critical for low-power battery-backed systems |
| TJ range | −55 °C to +150 °C - Validated operation across automotive under-hood and industrial ambient extremes |
| Package | DO-214AC (SMA) - Standardized SMT footprint compatible with IPC-7351B land patterns |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance. Polarity is unidirectional, with cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path) in unidirectional protection configuration |
| Cathode | Avalanche clamping terminal | Connected to protected line (e.g., +90 V rail); conducts during overvoltage to shunt surge to ground |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| Fast response time <1.0 ps | Enables suppression of ESD and fast-rising load-dump transients before MOSFET gate oxide breakdown |
| ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance | Validated for automotive 12 V system protection including battery disconnect transients and inductive switching noise |
| Moisture sensitivity level 1 | Eliminates bake preconditioning requirement prior to reflow, reducing manufacturing cost and process complexity |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained applications |
Applications
| Automotive Power Rail Protection | Industrial SMPS Input Stage |
|---|---|
Use Scenario: Protecting 12 V/24 V vehicle electronics against load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC/DC converter input to clamp surges up to 120 V. Use Value: Limits clamped voltage to 160 V at 1.9 A, preventing damage to upstream regulators rated for ≤200 V absolute max. | Use Scenario: Safeguarding AC-DC adapter primary-side rectifier output against line-induced surges. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing repetitive 400 W transients without degradation over >10⁵ cycles. Use Value: Maintains <1 µA leakage at 90 V, avoiding efficiency loss in no-load standby mode of Class VI adapters. |
| LED Driver Bus Protection | On-Board DC/DC Converter Input |
Use Scenario: Shielding constant-current LED driver ICs from inductive kickback during PWM dimming. IC Role / Device Role / Timing Role: Fast-clamping TVS placed across high-side switch drain-source to suppress flyback spikes. Use Value: Sub-1 ps response captures sub-microsecond transients before driver FET avalanche failure occurs. | Use Scenario: Securing 48 V-to-12 V buck converter input in telecom base station power modules. IC Role / Device Role / Timing Role: Primary overvoltage clamp on intermediate bus, coordinated with upstream OVP IC. Use Value: 150 °C max junction rating supports operation in sealed enclosures with limited airflow and ambient up to 85 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ90A | Narrower VBR range (100–111 V), lower VC (146 V @ 2.1 A), tighter tolerance | Better suited for precision clamping where margin below 150 V is critical | Select SMAJ90A when clamping voltage headroom is constrained and tighter VBR consistency is required |
| SMBJ90 | Same VWM/VBR/VC specs but in larger DO-214AA (SMB) package; 600 W PPPM rating | Higher power handling allows longer surge duration or higher repetition rates | Choose SMBJ90 only if board layout permits larger footprint and 600 W surge margin is needed |
Compared with SMAJ90A, the SMAJ90 offers wider VBR tolerance and slightly higher clamping voltage but greater surge current margin at same power level; versus SMBJ90, it trades 200 W peak power for smaller DO-214AC footprint and lower thermal mass in space-constrained designs.
Availability
SMAJ90 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial SMPS input stages, and LED driver bus protection requiring stable component supply across extended temperature and surge conditions.
Supply support for SMAJ90 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, serving global automotive, industrial, and consumer markets since 1979.
The SMAJ series is part of TSC's transient voltage suppression portfolio, engineered specifically for high-reliability, surface-mount overvoltage protection in harsh environments with stringent AEC-Q200 alignment and ISO 7637-2 validation.
FAQ
What is the maximum clamping voltage of the SMAJ90 under standard 10/1000 µs surge conditions?
The SMAJ90 has a maximum clamping voltage (VC) of 160 V when subjected to its rated peak impulse current of 1.9 A using the standardized 10/1000 µs waveform. This value is measured per Figure 5 in the official Taiwan Semiconductor datasheet U2102 and defines the upper voltage limit imposed on protected circuitry during transient events.
Is the SMAJ90 suitable for bidirectional transient suppression?
No, the SMAJ90 is a unidirectional TVS diode intended for DC line protection with defined polarity. For bidirectional applications, the SMAJ90CA variant (with CA suffix) must be used, as explicitly stated in the "Devices for Bipolar Applications" section of the datasheet. Using SMAJ90 in reverse-biased AC configurations risks premature failure.
What is the reverse leakage current specification for the SMAJ90 at its working stand-off voltage?
The SMAJ90 exhibits a maximum reverse leakage current (IR) of 1 µA when biased at its working stand-off voltage (VWM) of 90 V, tested at 25 °C. This low leakage ensures minimal power loss in always-on systems and avoids false triggering in high-impedance sensing circuits downstream.
Does the SMAJ90 meet automotive transient immunity standards?
Yes, the SMAJ90 is explicitly validated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test waveforms, making it suitable for 12 V automotive electronic control units. Its 400 W peak pulse power rating and −55 °C to +150 °C operating junction temperature range align with AEC-Q200 stress test profiles for transient suppressors.
What packaging and moisture sensitivity level does the SMAJ90 have?
The SMAJ90 is supplied in DO-214AC (SMA) package format on 7,500-piece tape-and-reel, with moisture sensitivity level (MSL) 1 per J-STD-020. This means it can be stored indefinitely at ambient conditions and requires no baking prior to SMT reflow, simplifying manufacturing logistics and reducing risk of popcorning.
SMAJ90 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- 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:
- 160V
- Current - Peak Pulse (10/1000µs):
- 1.9A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ90 FAQ
1.How can I place an order for SMAJ90 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ90 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 SMAJ90 reliable?
The price and inventory of SMAJ90 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ90 is usually 5 days.
3.What payment methods are accepted for SMAJ90?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ90 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ90?
SMAJ90 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ90 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 SMAJ90?
For technical support, including SMAJ90 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ90 requirements.
6.How does Aetrix verify that SMAJ90 is sourced from the original manufacturer or authorized distributors?
All SMAJ90 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 SMAJ90 meets industry standards.
7.What is the process for return or replacement of SMAJ90?
All SMAJ90 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ90, 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 SMAJ90 part is unused and in its original packaging.
Return procedure for SMAJ90:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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