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Taiwan Semiconductor Corporation SMAJ90CH
- Part No.:
- SMAJ90CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ90CH.pdf
- Description:
- 300W, 111V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:9,438
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Product details
Overview
SMAJ90CH from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade overvoltage protection. 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, and 400 W peak pulse power rating with 10/1000 µs waveform - ideal for protecting CAN bus interfaces and DC/DC converter inputs against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMAJ90CH datasheet, SMAJ90CH pinout, SMAJ90CH application, or SMAJ90CH equivalent, key selection criteria include its AEC-Q101 qualification, bidirectional polarity (CH suffix), low leakage (<1 µA @ 90 V), fast sub-1 ps response time, and compliance with automotive surge immunity standards - all critical for robust front-end protection in 12 V/24 V vehicle subsystems.
Technical Context
The SMAJ90CH implements a glass-passivated silicon junction optimized for high-energy transient suppression in bidirectional signal and power lines. Its clamping behavior is characterized by a tightly controlled VBR range (100–122 V at 1 mA test current) and low dynamic impedance, enabling consistent voltage limiting during fast-rising ESD or load-dump events.
Designed per ISO 7637-2 requirements, it sustains non-repetitive 10/1000 µs surges up to 1.9 A while maintaining VC ≤ 160 V, and operates across –55 °C to +150 °C junction temperature - supporting under-hood deployment without derating below 125 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 90 V - Maximum continuous reverse operating voltage before conduction begins; sets system-level overvoltage trip threshold. |
| VBR min/max | 100 / 122 V @ 1 mA - Confirmed breakdown window ensures reliable turn-on margin above VWM with minimal variation. |
| VC @ IPPM | 160 V @ 1.9 A - Clamping voltage under standardized 10/1000 µs surge defines worst-case protected node voltage excursion. |
| PPPM | 400 W - Peak pulse power handling capacity determines survivability against ISO 7637-2 Pulse 5a (load dump) energy. |
| IR @ VWM | <1 µA - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in always-on circuits. |
| Response time | <1.0 ps - Sub-picosecond junction response enables effective suppression of ESD and fast-edge transients. |
| TJ max | +150 °C - Extended junction temperature rating supports placement near heat sources in automotive ECUs. |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band marking; bidirectional configuration means both terminals are symmetrical - no anode/cathode distinction required in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient path | Either terminal serves as input/output; clamps voltage excursions in both polarities - eliminates need for polarity-aware routing. |
| Cathode band (marking) | Polarity indicator (for unidirectional reference) | Present on package but functionally irrelevant for SMAJ90CH; used only for manufacturing traceability and visual orientation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements - enables use in ASIL-B compliant systems without additional qualification. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (capacitive coupling) - covers full range of vehicle electrical disturbances. |
| Glass passivated junction | Enhances long-term reliability and moisture resistance versus epoxy-passivated alternatives - critical for under-hood humidity exposure. |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement prior to reflow - simplifies SMT assembly and reduces production risk. |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS directives - supports environmental compliance for global OEM supply chains. |
Applications
| Automotive CAN Bus Protection | On-Board DC/DC Converter Input |
|---|---|
Use Scenario: Protecting high-speed CAN FD transceivers from battery line transients and ESD in body control modules. IC Role / Device Role / Timing Role: Bidirectional TVS placed between CANH/CANL and chassis ground to clamp common-mode surges without distorting signal edges. Use Value: Maintains signal integrity up to 5 Mbps while surviving repeated ISO 7637-2 Pulse 2b events - prevents communication dropout during ignition cycling. |
Use Scenario: Safeguarding 48 V-to-12 V buck converter input stage against load dump and jump-start surges in mild hybrid vehicles. IC Role / Device Role / Timing Role: Primary overvoltage clamp on VIN rail, positioned upstream of input capacitor to limit voltage seen by controller IC and MOSFETs. Use Value: Limits peak input voltage to ≤160 V during 120 V/200 ms load dump pulses - avoids overvoltage shutdown and extends power stage lifetime. |
| LED Headlamp Driver Protection | Automotive Sensor Power Rail |
Use Scenario: Shielding constant-current LED driver ICs from alternator ripple and switching noise in adaptive front lighting systems. IC Role / Device Role / Timing Role: Parallel-connected TVS across input supply pins to absorb repetitive low-energy spikes from PWM-driven cooling fans and relays. Use Value: Withstands >100,000 cycles of 10/1000 µs transients at 50% rated power - ensures zero failure in 15-year headlamp service life. |
Use Scenario: Protecting radar and camera sensor power supplies from coupled transients induced by nearby high-current actuators. IC Role / Device Role / Timing Role: Low-leakage TVS on 3.3 V or 5 V LDO output to suppress sub-100 ns ESD bursts without loading regulated rail. Use Value: <1 µA leakage at 90 V stand-off ensures no measurable impact on LDO regulation accuracy or sensor bias stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ90CA | Identical VWM (90 V), VBR (100–122 V), and VC (160 V); same DO-214AC package and AEC-Q101 qualification. | Same ISO 7637-2 compliance and thermal specs; differs only in tape-and-reel packaging quantity (5,000 vs. 7,500 units). | Drop-in replacement with identical electrical and mechanical performance - suitable when dual-sourcing is required. |
| ON Semiconductor SMAJ90AY | VWM = 90 V, but VBR = 100–111 V (tighter tolerance), VC = 146 V @ 2.1 A; lower clamping voltage but reduced surge current rating. | Better clamping performance for sensitive analog rails, but lower IPPM margin makes it less robust for high-energy load dump scenarios. | Preferred where lower VC is prioritized over peak surge endurance - e.g., protecting low-voltage microcontrollers rather than power stages. |
Compared with SMAJ90CH, SMAJ90CA offers identical performance and sourcing flexibility, while SMAJ90AY trades peak current capability for tighter clamping - making SMAJ90CH optimal for high-energy automotive power rail protection where both clamping voltage and surge margin must be simultaneously satisfied.
Availability
SMAJ90CH is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, and LED lighting systems requiring stable component supply with AEC-Q101 validation and ISO 7637-2 compliance.
Supply support for SMAJ90CH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers - serving automotive, industrial, and consumer markets since 1979.
The SMAJ series was developed specifically for AEC-Q101-compliant transient protection in harsh automotive environments, emphasizing robustness, tight parameter distribution, and seamless SMT integration.
FAQ
What does the "CH" suffix indicate in SMAJ90CH?
The "CH" suffix in SMAJ90CH denotes a bidirectional TVS diode configuration with symmetrical clamping behavior in both polarities. Unlike unidirectional variants (e.g., SMAJ90H), SMAJ90CH has no designated anode or cathode - enabling simplified PCB layout for differential or AC-coupled protection applications such as CAN bus or Ethernet PHY interfaces.
Is SMAJ90CH suitable for ISO 7637-2 Pulse 5a (load dump) protection?
SMAJ90CH is rated for 400 W peak pulse power with a 10/1000 µs waveform, which aligns with ISO 7637-2 Pulse 5a energy levels up to ~120 V. However, Pulse 5a requires higher energy handling (up to 1000 W for 12 V systems); SMAJ90CH is best applied for Pulses 1, 2a, 2b, 3a, and 3b. For full Pulse 5a coverage, a higher-power device like 5.0SMDJ90A is recommended alongside SMAJ90CH as secondary protection.
What is the maximum operating temperature for SMAJ90CH?
SMAJ90CH has a maximum junction temperature (TJ max) of +150 °C and operates across –55 °C to +150 °C. Its thermal derating curve (Fig.2 in datasheet) shows full 400 W pulse power capability at 25 °C ambient, decreasing linearly to ~240 W at +125 °C ambient - confirming suitability for under-hood locations in modern automotive ECUs.
How does SMAJ90CH compare to SMAJ90AH in terms of clamping performance?
SMAJ90CH has a maximum clamping voltage (VC) of 160 V at 1.9 A, while SMAJ90AH achieves 146 V at 2.1 A. The CH variant trades slightly higher VC for broader surge current tolerance and bidirectional symmetry; the AH variant offers tighter clamping but only in unidirectional operation - making SMAJ90CH preferable for differential signal protection where polarity reversal may occur.
Does SMAJ90CH require special PCB layout considerations?
SMAJ90CH uses a DO-214AC (SMA) package with symmetrical terminals, so no polarity-aware routing is needed. To maximize protection effectiveness, minimize trace inductance by placing SMAJ90CH within 5 mm of the protected node and using wide, short ground paths to chassis or local ground plane - especially critical for sub-nanosecond response time to maintain clamping fidelity.
SMAJ90CH 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ90CH FAQ
1.How can I place an order for SMAJ90CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ90CH 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 SMAJ90CH reliable?
The price and inventory of SMAJ90CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ90CH is usually 5 days.
3.What payment methods are accepted for SMAJ90CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ90CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ90CH?
SMAJ90CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ90CH 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 SMAJ90CH?
For technical support, including SMAJ90CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ90CH requirements.
6.How does Aetrix verify that SMAJ90CH is sourced from the original manufacturer or authorized distributors?
All SMAJ90CH 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 SMAJ90CH meets industry standards.
7.What is the process for return or replacement of SMAJ90CH?
All SMAJ90CH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ90CH, 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 SMAJ90CH part is unused and in its original packaging.
Return procedure for SMAJ90CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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