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Taiwan Semiconductor Corporation SMAJ90C
- Part No.:
- SMAJ90C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ90C.pdf
- Description:
- 300W, 111V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:4,253
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Product details
Overview
SMAJ90C from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 90V working stand-off voltage (VWM), 100–122V breakdown voltage (VBR), and 160V maximum clamping voltage (VC) at 1.9A peak impulse current - designed for overvoltage protection in DC/DC converters and automotive power rails.
For engineers reviewing the SMAJ90C datasheet, SMAJ90C pinout, SMAJ90C application, or SMAJ90C equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction temperature range (−55°C to +150°C), moisture sensitivity level (J-STD-020 Level 1), and compatibility with automated SMT placement on high-reliability industrial and automotive PCBs.
Technical Context
The SMAJ90C employs a glass-passivated silicon junction optimized for fast transient response (<1.0 ps rise time from 0 V to VBR min) and low leakage (<1 µA at 90 V). Its unidirectional configuration provides asymmetric conduction: low forward voltage (VF = 3.5 V at 25 A) during surge events and high reverse blocking up to 90 V under normal operation.
It delivers 400 W peak pulse power (10/1000 µs waveform) at 25°C, derated linearly above ambient temperature per Fig.2, and supports single half-sine surge currents up to 40 A (8.3 ms). The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for molded compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 90 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC rail margin for 90 V nominal systems. |
| VBR min/max | 100 V / 122 V @ 1 mA - Confirmed breakdown threshold range ensures reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 160 V @ 1.9 A - Clamping voltage limits downstream component stress during 10/1000 µs surges; critical for IEC 61000-4-5 compliance margin. |
| PPPM | 400 W (10/1000 µs) - Peak surge energy handling capacity; sufficient for ISO 7637-2 Pulse 5a (load dump) in 24 V automotive subsystems. |
| TJ max | +150 °C - Maximum junction temperature rating enables use in under-hood or enclosed power supply environments without thermal derating penalties. |
| IR @ VWM | ≤1 µA - Ultra-low reverse leakage preserves efficiency in high-impedance bias networks and battery-backed circuits. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-diode unidirectional configuration with cathode band marking. Matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance. Weight: 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path; conducts surge current toward ground during overvoltage events. |
| Cathode | Reverse-blocking terminal | Connected to protected line (e.g., 90 V rail); blocks normal operation voltage but avalanches at ≥100 V to clamp transients. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure per J-STD-020 Level 1. |
| Fast response time | <1.0 ps from 0 V to VBR min - mitigates sub-nanosecond ESD and lightning-induced edge transients before IC damage occurs. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load disconnect), Pulse 2a/2b (battery feed interruption), and Pulse 3a/3b (switching noise) - essential for automotive ECUs and body controllers. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - supports green manufacturing and end-of-life recycling requirements. |
Applications
| Automotive Power Distribution | Industrial DC/DC Converters |
|---|---|
Use Scenario: Protection of 24 V/48 V battery-fed control modules against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp ISO 7637-2 Pulse 5a surges up to 100 V. Use Value: Limits clamped voltage to 160 V, preserving 200 V-rated MOSFETs and gate drivers without derating headroom. |
Use Scenario: Input-stage surge suppression in isolated 90 V output DC/DC converters for factory automation sensors. IC Role / Device Role / Timing Role: Standoff-rated TVS across primary-side input capacitor to absorb coupling transients from adjacent switching stages. Use Value: 90 V VWM matches converter input rating; 160 V VC prevents secondary-side controller latch-up during 1 kV EFT bursts. |
| LED Driver Power Supplies | Telecom Line Cards |
Use Scenario: Overvoltage protection for constant-current LED drivers powered from 90 V AC/DC front-ends. IC Role / Device Role / Timing Role: Unidirectional TVS connected anode-to-ground, cathode-to-input rail to suppress rectifier switching spikes and lightning-induced surges. Use Value: 400 W PPPM handles repetitive 10/1000 µs surges common in outdoor lighting installations without degradation. |
Use Scenario: Secondary-side rail protection on telecom line cards exposed to induced surges via backplane traces. IC Role / Device Role / Timing Role: TVS deployed on 90 V bias rails feeding RF amplifiers or DAC reference supplies. Use Value: ≤1 µA IR at 90 V avoids loading precision analog references; DO-214AC footprint allows dense layout near connectors. |
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) and lower VC (146 V @ 2.1 A); same 90 V VWM and DO-214AC package. | Better clamping ratio (146 V / 90 V = 1.62 vs. 160 V / 90 V = 1.78) improves margin for 150 V-rated downstream FETs. | Select SMAJ90A when tighter clamping voltage and higher IPPM (2.1 A) are prioritized over absolute peak power handling. |
| SMBJ90C | Same VWM/VBR/VC specs but in larger DO-214AA (SMB) package; rated for 600 W PPPM (10/1000 µs). | Higher surge robustness suits high-energy environments (e.g., railway traction converters), but requires larger PCB area and different stencil design. | Choose SMBJ90C only if system-level surge testing exceeds 400 W or thermal dissipation demands lower junction rise. |
Compared with SMAJ90A and SMBJ90C, the SMAJ90C balances compact DO-214AC footprint, certified ISO 7637-2 immunity, and 400 W surge capability - making it optimal for space-constrained automotive and industrial modules where 160 V clamping is acceptable.
Availability
SMAJ90C is available at Aetrix Electronics and suitable for automotive power distribution, industrial DC/DC converters, LED driver power supplies, and telecom line cards requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ90C 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 industrial and automotive markets.
The SMAJ series was developed specifically for AEC-Q101-compliant transient protection in harsh-environment 12 V/24 V/48 V systems, emphasizing low leakage, tight VBR tolerance, and robust surge endurance under thermal cycling.
FAQ
What is the polarity configuration of the SMAJ90C?
The SMAJ90C is a unidirectional TVS diode with cathode-band marking indicating the cathode terminal. It blocks reverse voltage up to 90 V (VWM) and avalanches in reverse bias above ~100 V, while conducting forward current with VF ≤ 3.5 V at 25 A. This configuration is intended for DC rail protection where polarity is fixed and reverse conduction must be prevented during normal operation.
Does the SMAJ90C meet automotive qualification standards?
Yes, the SMAJ90C is AEC-Q101 qualified for automotive applications and explicitly tested to ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient waveforms. Its DO-214AC package meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity - confirming suitability for reflow-soldered automotive ECUs and body control modules.
What is the maximum clamping voltage of the SMAJ90C under standard test conditions?
The SMAJ90C has a maximum clamping voltage (VC) of 160 V when subjected to a 10/1000 µs surge waveform at 1.9 A peak impulse current (IPPM), as specified in Taiwan Semiconductor's U2102 datasheet. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuitry during standardized transient events.
Can the SMAJ90C be used in bidirectional signal-line protection?
No - the SMAJ90C is unidirectional and unsuitable for bidirectional AC or data-line protection. For symmetric transient suppression (e.g., RS-485, CAN bus), Taiwan Semiconductor offers the SMAJ90CA variant (with 'CA' suffix), which features matched breakdown in both directions and identical VWM/VBR/VC ratings for positive and negative transients.
What is the thermal derating behavior of the SMAJ90C above 25°C ambient?
The SMAJ90C's peak pulse power (PPPM) is linearly derated above TA = 25°C per Figure 2 in the U2102 datasheet: at 75°C ambient, PPPM drops to ~280 W; at 125°C, it falls to ~120 W. This derating reflects reduced junction-to-ambient thermal resistance margin and must be accounted for in high-temperature enclosures or densely packed power modules.
SMAJ90C 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:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ90C FAQ
1.How can I place an order for SMAJ90C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ90C 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 SMAJ90C reliable?
The price and inventory of SMAJ90C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ90C is usually 5 days.
3.What payment methods are accepted for SMAJ90C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ90C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ90C?
SMAJ90C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ90C 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 SMAJ90C?
For technical support, including SMAJ90C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ90C requirements.
6.How does Aetrix verify that SMAJ90C is sourced from the original manufacturer or authorized distributors?
All SMAJ90C 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 SMAJ90C meets industry standards.
7.What is the process for return or replacement of SMAJ90C?
All SMAJ90C units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ90C, 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 SMAJ90C part is unused and in its original packaging.
Return procedure for SMAJ90C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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