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Taiwan Semiconductor Corporation SMAJ90CA
- Part No.:
- SMAJ90CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ90CA.pdf
- Description:
- TVS DIODE 90VWM 146VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,884
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Product details
Overview
SMAJ90CA from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection in DC power rails. It features a 90 V working stand-off voltage (VWM), 100–111 V breakdown range (VBR @ 1 mA), 146 V maximum clamping voltage (VC) at 2.1 A peak impulse current, and 400 W peak pulse power rating per 10/1000 µs waveform.
For engineers reviewing the SMAJ90CA datasheet, SMAJ90CA pinout, SMAJ90CA application, or SMAJ90CA equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1 ps response time, <1 µA reverse leakage at VWM, and DO-214AC mechanical compatibility with automated SMT placement.
Technical Context
The SMAJ90CA operates as a silicon avalanche diode optimized for fast transient suppression in automotive and industrial power systems. Its bidirectional configuration enables symmetrical clamping across both polarities without external polarity management, and its glass-passivated junction ensures stable breakdown characteristics under repeated surge stress.
It delivers 400 W peak pulse power (derated above 25°C) with a 10/1000 µs waveform, supports operating junction temperatures from –55°C to +150°C, and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for the molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 90 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 100 V / 111 V @ 1 mA - Confirmed avalanche onset range ensuring reliable turn-on margin |
| VC @ IPPM | 146 V @ 2.1 A - Clamped voltage during full-rated 400 W surge, limiting downstream stress |
| IR @ VWM | <1 µA - Negligible leakage current preserves efficiency in low-power standby circuits |
| Package | DO-214AC (SMA) - Standard surface-mount outline compatible with IPC-7351B land patterns |
| Standards | ISO 7637-2 compliant (Pulse 1/2a/2b/3a/3b) - Validated for automotive load-dump and inductive-switching immunity |
| TJ max | +150 °C - Enables operation in high-temperature engine-bay or industrial enclosure environments |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with coplanar matte tin-plated leads; cathode band marking denotes polarity reference point for bidirectional symmetry; moisture sensitivity level (MSL) = 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction terminals | No functional polarity - either lead connects to protected line; clamping occurs identically in both directions |
| Case | Non-electrical mechanical body | No internal connection; serves only as thermal mass and mounting interface |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term stability of VBR and low parameter drift across temperature and lifetime |
| <1 ps response time | Clamps transients before sensitive downstream ICs experience damaging overvoltage |
| 400 W peak pulse power (10/1000 µs) | Handles high-energy surges common in 12 V/24 V automotive and industrial DC systems |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and global environmental directives for PCB assembly |
| Automated placement compatible | DO-214AC footprint and lead geometry support high-speed pick-and-place with >99.9% placement yield |
Applications
| Automotive Power Distribution | Industrial SMPS Input Stage |
|---|---|
Use Scenario: Protection of 24 V battery-fed ECUs against load dump and alternator transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Primary clamping device placed directly at connector entry point to shunt surge energy before it reaches DC/DC controllers or microcontrollers. Use Value: Limits line voltage to ≤146 V during 400 W surges, preventing latch-up or gate oxide rupture in downstream MOSFET drivers and LDOs. | Use Scenario: Input rail protection in DIN-rail mounted 48 V to 5 V isolated DC/DC converters used in PLC I/O modules. IC Role / Device Role / Timing Role: Standoff protector on primary-side bulk capacitor input, absorbing switching noise and lightning-induced ring waves. Use Value: Maintains 90 V working margin while clamping to 146 V, preserving hold-up time and avoiding unnecessary crowbar triggering. |
| LED Driver Front-End | On-Board Charger (OBC) Auxiliary Supply |
Use Scenario: Overvoltage safeguard for constant-current LED drivers powered from unregulated 12–48 V vehicle or streetlight supplies. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input terminals to absorb reverse-polarity connection errors and inductive kickback from driver FETs. Use Value: Symmetric clamping eliminates need for dual-diode arrangements, reducing BOM count and board space by 30% vs. unidirectional solutions. | Use Scenario: Transient suppression on the 12 V auxiliary supply rail derived from OBC high-voltage DC link via flyback converter. IC Role / Device Role / Timing Role: Secondary-side TVS protecting MCU, CAN transceiver, and gate drivers from coupled noise and ground bounce. Use Value: Sub-1 µA leakage at 90 V prevents measurable quiescent current increase, critical for 24/7 always-on monitoring functions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ90CA (Bourns) | Same VWM/VC specs but 600 W peak power (10/1000 µs); larger SMB package (DO-214AA) | Higher surge margin suits harsher environments (e.g., off-highway vehicles); requires PCB layout change | Select when system-level surge testing exceeds 400 W or when thermal derating headroom is needed |
| P6SMB90CA (ON Semiconductor) | Identical electrical specs and DO-214AC package; ±5% VBR tolerance vs. SMAJ90CA's ±5.5% | Drop-in replacement with identical footprint and solder profile; same ISO 7637-2 compliance | Preferred for dual-sourcing where qualification reuse and supply chain diversification are priorities |
Compared with SMBJ90CA and P6SMB90CA, the SMAJ90CA offers optimal balance of compact DO-214AC size, certified 400 W surge handling, and tight process control for cost-sensitive automotive Tier 2 modules-making it ideal where board area and qualification continuity outweigh marginal power-margin gains.
Availability
SMAJ90CA is available at Aetrix Electronics and suitable for automotive ECU protection, industrial DC/DC converter input stages, LED driver front-ends, and on-board charger auxiliary supplies requiring stable component supply across multi-year production cycles.
Supply support for SMAJ90CA 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 since 1979.
The SMAJ series was developed specifically for AEC-Q101 qualified automotive transient suppression, emphasizing reliability under thermal cycling, humidity, and repetitive surge stress in 12 V/24 V/48 V systems.
FAQ
What is the clamping voltage of the SMAJ90CA under full-rated surge conditions?
The SMAJ90CA clamps to a maximum of 146 V when subjected to its rated 2.1 A peak impulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per JEDEC test conditions and guarantees that downstream circuitry sees no more than 146 V during a 400 W transient event. The SMAJ90CA maintains this clamping performance across its full operating temperature range of –55°C to +150°C.
Is the SMAJ90CA suitable for bidirectional signal line protection?
No-the SMAJ90CA is engineered exclusively for DC power rail protection, not signal integrity. Its 90 V VWM and 146 V VC are too high for data lines (e.g., CAN, LIN, USB), and its junction capacitance is unspecified for high-frequency use. For signal-line TVS, lower-voltage, low-capacitance devices such as the SMAJ12CA or dedicated ESD arrays should be selected. The SMAJ90CA remains optimal for 24 V/48 V power bus clamping.
Does the SMAJ90CA meet AEC-Q101 qualification requirements?
Yes-the SMAJ90CA is AEC-Q101 qualified for automotive applications. Taiwan Semiconductor subjects the SMAJ90CA to stress tests including high-temperature operating life (HTOL), temperature cycling, unbiased highly accelerated stress test (uHAST), and surge endurance per JESD22-A114. Full qualification reports are available upon request, confirming suitability for under-hood and chassis-mounted modules where reliability under thermal and electrical stress is mandatory.
How does the SMAJ90CA compare to unidirectional TVS diodes like SMAJ90A?
The SMAJ90CA provides symmetrical clamping in both directions, making it ideal for AC-coupled or polarity-agnostic DC rails where reverse-voltage events (e.g., battery misconnection) must be suppressed. In contrast, the unidirectional SMAJ90A only clamps in reverse bias and conducts forward like a rectifier. The SMAJ90CA eliminates the need for external polarity protection circuitry, simplifying design and improving fault coverage-especially in systems with shared ground architectures or floating inputs.
What is the maximum allowable printed circuit board pad temperature during reflow soldering of the SMAJ90CA?
The SMAJ90CA's DO-214AC package is rated for lead-free reflow per J-STD-020, with a peak reflow temperature of 260°C for ≤10 seconds. The recommended thermal profile maintains board pad temperature below 245°C at the component body to prevent molding compound degradation or internal delamination. Taiwan Semiconductor specifies MSL Level 1, meaning floor life is unlimited-no baking is required prior to assembly if stored in dry-packed conditions.
SMAJ90CA 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:
- 146V
- Current - Peak Pulse (10/1000µs):
- 2.1A
- 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)
SMAJ90CA FAQ
1.How can I place an order for SMAJ90CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ90CA 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 SMAJ90CA reliable?
The price and inventory of SMAJ90CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ90CA is usually 5 days.
3.What payment methods are accepted for SMAJ90CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ90CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ90CA?
SMAJ90CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ90CA 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 SMAJ90CA?
For technical support, including SMAJ90CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ90CA requirements.
6.How does Aetrix verify that SMAJ90CA is sourced from the original manufacturer or authorized distributors?
All SMAJ90CA 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 SMAJ90CA meets industry standards.
7.What is the process for return or replacement of SMAJ90CA?
All SMAJ90CA units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ90CA, 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 SMAJ90CA part is unused and in its original packaging.
Return procedure for SMAJ90CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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