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Taiwan Semiconductor Corporation SMAJ90H
- Part No.:
- SMAJ90H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ90H.pdf
- Description:
- 300W, 111V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:6,674
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Product details
Overview
SMAJ90H from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal 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 pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - deployed in automotive-grade SMPS and on-board DC/DC converters.
For engineers reviewing the SMAJ90H datasheet, SMAJ90H pinout, SMAJ90H application, or SMAJ90H equivalent, key selection criteria include its AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, DO-214AC (SMA) package compatibility, and verified clamping performance under repetitive surge stress in 12 V/24 V vehicle subsystems.
Technical Context
The SMAJ90H operates as a unidirectional avalanche diode with glass-passivated junction, delivering sub-1 ps response time from 0 V to VBR(min). Its clamping behavior is defined by a single-die silicon structure optimized for low dynamic impedance during 10/1000 µs transients.
It supports operation across –55 °C to +150 °C junction temperature range, with <1 µA reverse leakage at rated VWM, and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements - confirming suitability for lead-free reflow assembly in automotive electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 90 V - Maximum continuous DC or RMS voltage the device blocks without conduction. |
| VBR @ IT=1 mA | 100–122 V - Verified avalanche onset range ensuring reliable triggering above system operating voltage. |
| VC @ IPPM=1.9 A | 160 V - Clamped voltage during 10/1000 µs surge, limiting downstream IC stress to safe levels. |
| PPPM | 400 W - Peak pulse power handling capability, derated linearly above 25 °C ambient per Fig.2. |
| IR @ VWM | <1 µA - Ultra-low leakage preserves efficiency in high-impedance bias networks and sensor interfaces. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with 0.060 g mass and UL 94V-0 molding compound. |
Pinout & Package
DO-214AC (SMA) package: cathode-banded unidirectional configuration with two terminals - anode (non-banded end) and cathode (banded end). Matte tin-plated leads comply with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to lower-potential side of protected line; enables low-VF (3.5 V @ 25 A) crowbar path during fault. |
| Cathode | Current exit point during reverse avalanche | Connected to higher-potential rail; defines polarity-sensitive clamping direction and marks terminal orientation on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood and cabin applications per stress test conditions including temperature cycling, HTRB, and ESD. |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) waveforms. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal-humidity bias stress (e.g., 85 °C/85% RH). |
| Fast response time | <1.0 ps rise-to-breakdown enables protection of high-speed logic and analog circuits before transient energy couples into ICs. |
Applications
| Automotive Power Distribution | Industrial DC/DC Converters |
|---|---|
Use Scenario: Protection of 24 V battery-fed control modules against load dump and alternator ripple. IC Role / Device Role: Unidirectional TVS clamp placed between battery rail and input stage of PMIC or microcontroller power supply. Use Value: Limits transient overshoot to ≤160 V, preventing latch-up or gate oxide damage in downstream 36 V-rated regulators. |
Use Scenario: Input-side surge suppression in isolated 48 V-to-12 V buck-boost converters for factory automation. IC Role / Device Role: Primary overvoltage guard on HV input bus prior to primary-side controller and transformer. Use Value: Absorbs 400 W pulses without degradation, maintaining >90% efficiency across –40 °C to +125 °C operating range. |
| LED Driver Power Stages | Telecom Power Interfaces |
Use Scenario: Transient suppression on constant-current LED string supplies exposed to lightning-induced surges. IC Role / Device Role: Parallel-connected TVS across output capacitor to clamp flyback spikes during MOSFET switching faults. Use Value: Clamps to 160 V within 1 ps, protecting 100 V-rated LED driver ICs and enabling compact heatsink-less design. |
Use Scenario: Ethernet PoE+ (IEEE 802.3at) power input protection on edge routers and IP cameras. IC Role / Device Role: First-line defense on 57 V DC input rail against induced surges from cable runs and ESD events. Use Value: Meets IEC 61000-4-5 Level 4 (4 kV) when combined with series impedance, with no derating required up to 125 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ90AH | Lower VBR range (100–111 V) and reduced VC (146 V @ 2.1 A); tighter VBR tolerance. | Better suited for precision-clamp designs where margin below 150 V absolute max is critical. | Select SMAJ90AH when clamping voltage headroom is constrained and tighter VBR consistency improves yield. |
| SMBJ90A | Same VWM/VBR but SMB package (DO-214AA); 600 W PPPM rating; higher IPPM (2.7 A). | Requires larger PCB footprint; preferred for higher-energy surge environments (e.g., industrial mains input). | Choose SMBJ90A only if 600 W pulse handling is mandatory and board space allows DO-214AA layout. |
Compared with SMAJ90AH and SMBJ90A, the SMAJ90H offers balanced clamping voltage (160 V), industry-standard DO-214AC footprint, and AEC-Q101 validation - making it optimal for cost-sensitive, space-constrained automotive and industrial DC rail protection where 400 W pulse capacity suffices.
Availability
SMAJ90H is available at Aetrix Electronics and suitable for automotive power distribution, industrial DC/DC converters, LED driver power stages, and telecom power interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMAJ90H 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 automotive and industrial markets.
The SMAJ series was developed specifically for AEC-Q101-compliant transient suppression in 12 V/24 V/48 V automotive subsystems and ruggedized industrial power supplies - emphasizing reliability, tight parametric control, and seamless SMT integration.
FAQ
What is the maximum clamping voltage of the SMAJ90H under standard test conditions?
The SMAJ90H exhibits a maximum clamping voltage (VC) of 160 V when subjected to a 10/1000 µs waveform with a peak pulse current (IPPM) of 1.9 A. This value is measured per JEDEC standards and ensures downstream components remain within safe operating limits during surge events. The SMAJ90H maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C.
Is the SMAJ90H suitable for bidirectional transient protection?
No, the SMAJ90H is a unidirectional TVS diode intended for DC rail protection with defined polarity. For bidirectional applications, Taiwan Semiconductor specifies parts with "CH" or "CAH" suffixes (e.g., SMAJ90CH). Using SMAJ90H in AC or reversible-polarity circuits would result in forward conduction during negative half-cycles, potentially causing failure. Always verify polarity alignment before placing SMAJ90H in circuit.
Does the SMAJ90H meet automotive qualification standards?
Yes, the SMAJ90H is explicitly AEC-Q101 qualified and tested per the full stress test schedule, including high-temperature reverse bias (HTRB), temperature cycling, and mechanical shock. It also complies with ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms - confirming suitability for engine control units, body electronics, and ADAS power domains. Documentation is available in TSC's official AEC-Q101 certificate for the SMAJxH family.
What is the reverse leakage current specification for the SMAJ90H at its working voltage?
The SMAJ90H guarantees a maximum reverse leakage current (IR) of 1 µA when biased at its rated working stand-off voltage (VWM) of 90 V and tested at 25 °C. This ultra-low leakage minimizes standby power loss in battery-powered systems and avoids false triggering in high-impedance sensing nodes. At elevated temperatures (e.g., 125 °C), IR remains below 5 µA per datasheet derating curves.
Can the SMAJ90H be used in lead-free reflow soldering processes?
Yes, the SMAJ90H is fully compatible with lead-free reflow soldering per J-STD-002, featuring matte tin-plated leads and a UL 94V-0 compliant molding compound. Its moisture sensitivity level is rated J-STD-020 Level 1, meaning it can be stored indefinitely at ambient conditions without baking. The device withstands peak reflow temperatures up to 260 °C for 10 seconds, supporting standard Pb-free assembly lines without delamination or parameter shift.
SMAJ90H 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ90H FAQ
1.How can I place an order for SMAJ90H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ90H 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 SMAJ90H reliable?
The price and inventory of SMAJ90H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ90H is usually 5 days.
3.What payment methods are accepted for SMAJ90H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ90H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ90H?
SMAJ90H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ90H 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 SMAJ90H?
For technical support, including SMAJ90H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ90H requirements.
6.How does Aetrix verify that SMAJ90H is sourced from the original manufacturer or authorized distributors?
All SMAJ90H 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 SMAJ90H meets industry standards.
7.What is the process for return or replacement of SMAJ90H?
All SMAJ90H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ90H, 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 SMAJ90H part is unused and in its original packaging.
Return procedure for SMAJ90H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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