My Inquiry
My Account
Taiwan Semiconductor Corporation SMAJ90CAH
- Part No.:
- SMAJ90CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ90CAH.pdf
- Description:
- TVS DIODE 90VWM 146VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,075
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ90CAH from Taiwan Semiconductor is a bidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade surge protection with 90V working stand-off voltage, 100–111V breakdown range at 1mA, and 146V clamping voltage at 2.1A peak impulse current. It meets ISO 7637-2 Pulse 1/2a/2b/3a/3b and is AEC-Q101 qualified for use in on-board DC/DC converters and lighting systems.
For engineers reviewing the SMAJ90CAH datasheet, SMAJ90CAH pinout, SMAJ90CAH application, or SMAJ90CAH equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, JEDEC-compliant DO-214AC mechanical data, and direct alternatives for automotive power rail protection design.
Technical Context
The SMAJ90CAH is a glass-passivated, bipolar junction TVS diode optimized for fast transient suppression on 12V/24V automotive power networks. Its sub-1ps response time ensures clamping before downstream ICs experience overvoltage stress, while its 150°C maximum junction temperature supports under-hood deployment.
It operates symmetrically in both directions - no anode/cathode polarity dependency - and maintains <1µA reverse leakage at 90V, enabling low-power standby compatibility. The device sustains 400W peak pulse power per 10/1000µs waveform up to 25°C, derating linearly above that ambient per Fig.2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 90 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR min/max | 100 V / 111 V @ 1 mA - Confirmed breakdown threshold range defining turn-on consistency across production lot |
| VC @ IPPM | 146 V @ 2.1 A - Clamped voltage during 10/1000µs surge, limiting downstream voltage stress to safe levels |
| PPPM | 400 W (10/1000µs) - Peak transient energy absorption capacity before failure |
| IR @ VWM | ≤1 µA - Negligible leakage at rated stand-off, preserving battery life in always-on circuits |
| TJ max | 150 °C - Enables operation in engine compartment environments without thermal shutdown |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with 0.060g mass and J-STD-002 solderability |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (not functional for bidirectional SMAJ90CAH), UL 94V-0 rated compound, and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Transient return path (bidirectional) | Electrically identical to cathode; interchangeable connection point for symmetrical surge shunting |
| Cathode (Lead 2) | Transient return path (bidirectional) | Same as Lead 1 - no polarity sensitivity; either lead may connect to protected line or ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics per stress test requirements including temperature cycling, HTRB, and ESD |
| Glass passivated junction | Enhances long-term reliability and moisture resistance versus epoxy-passivated alternatives |
| ISO 7637-2 compliance | Guarantees robustness against load dump, alternator ripple, and inductive switching transients in vehicle ECUs |
| Fast response time | Typically <1.0 ps - initiates clamping before most microcontrollers or gate drivers can be damaged |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive - suitable for green manufacturing and export compliance |
Applications
| Automotive Lighting Systems | On-Board DC/DC Converters |
|---|---|
Use Scenario: Protecting LED driver ICs and MOSFETs from load-dump spikes during headlight or brake-light switching. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across input rails to limit transients to ≤146V during ISO 7637-2 Pulse 5a events. Use Value: Prevents latch-up or gate oxide rupture in 40V-rated buck controllers by holding rail voltage within safe operating area. | Use Scenario: Safeguarding secondary-side synchronous rectifiers and feedback optocouplers in 12V-to-3.3V isolated converters. IC Role / Device Role / Timing Role: Fast-clamping TVS connected between output rail and ground to absorb coupled noise from primary-side switching. Use Value: Maintains regulation stability by preventing false triggering of overvoltage protection circuits during 100ns–1µs transients. |
| Industrial SMPS Inputs | Vehicle Body Control Modules (BCM) |
Use Scenario: Input-stage protection for 24V industrial switch-mode power supplies exposed to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary-line TVS suppressing common-mode transients before input EMI filter and bridge rectifier. Use Value: Reduces need for oversized MOVs or gas discharge tubes by delivering precise 146V clamping with minimal capacitance (<100pF). | Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins from battery reversal and jump-start surges in door modules and seat controls. IC Role / Device Role / Timing Role: Bidirectional clamp across VCC-GND rails to absorb ±100V transients per ISO 16750-2. Use Value: Eliminates need for separate positive/negative TVS devices - single SMAJ90CAH handles both polarities with matched clamping. |
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 | 600W peak power (10/1000µs), same VWM/VBR/VC but higher IPPM (3.3A), larger SMB package | Better suited for higher-energy transients; requires PCB layout change due to 4.6 × 3.6 mm footprint vs. SMA's 4.2 × 2.6 mm | Select when system-level testing shows >400W surge exposure or when thermal margin is constrained |
| P6SMB90CA | 600W rating, identical VWM/VBR/VC specs, same SMB package, but not AEC-Q101 qualified | Lacks automotive qualification; acceptable for industrial/commercial DC/DC inputs where AEC-Q101 is not mandated | Choose for cost-sensitive non-automotive designs requiring same electrical performance without automotive certification overhead |
Compared with SMBJ90CA and P6SMB90CA, SMAJ90CAH offers the smallest footprint among 90V bidirectional TVS diodes with AEC-Q101 validation - critical for space-constrained automotive modules where board area and qualification are both non-negotiable.
Availability
SMAJ90CAH is available at Aetrix Electronics and suitable for automotive lighting systems, on-board DC/DC converters, and industrial SMPS inputs requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ90CAH 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 high-reliability protection devices and power management components.
The SMAJ series is engineered specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 compliance, tight parametric distribution, and robust surge handling in compact surface-mount packages.
FAQ
What is the clamping voltage of SMAJ90CAH and how is it measured?
The SMAJ90CAH has a maximum clamping voltage (VC) of 146 V, measured at a peak impulse current (IPPM) of 2.1 A using the standardized 10/1000 µs double-exponential waveform per IEC 61000-4-5. This value is guaranteed across the full operating temperature range and reflects the actual voltage seen by downstream circuitry during surge events - critical for validating safe operating margins of protected ICs.
Is SMAJ90CAH unidirectional or bidirectional, and how does that affect PCB layout?
SMAJ90CAH is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients without polarity sensitivity. Unlike unidirectional variants (e.g., SMAJ90AH), SMAJ90CAH has no functional anode/cathode distinction - either lead may connect to the protected line or ground. This simplifies layout by eliminating orientation constraints and enables single-device protection of floating or AC-coupled rails.
Does SMAJ90CAH meet automotive qualification standards?
Yes, SMAJ90CAH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements. Its qualification includes temperature cycling, high-temperature reverse bias (HTRB), and electrostatic discharge (ESD) testing per JESD22-A114. These certifications confirm suitability for under-hood and body-control module applications where reliability under thermal and electrical stress is mandatory.
What is the maximum steady-state power dissipation for SMAJ90CAH?
The SMAJ90CAH has a steady-state power dissipation (PD) rating of 1 W at 25°C ambient, defined by its thermal resistance and package construction. This value applies only to continuous DC or low-frequency AC conditions - not transient events. For sustained operation near VWM (90 V), leakage current remains ≤1 µA, resulting in <90 µW static power loss, well within the 1 W limit.
How does the DO-214AC (SMA) package of SMAJ90CAH compare to SMB in size and thermal performance?
The DO-214AC (SMA) package of SMAJ90CAH measures 4.2 × 2.6 × 2.3 mm, approximately 30% smaller in footprint than the DO-214AA (SMB) package used by SMBJ90CA. While SMA offers superior board-area efficiency, SMB provides ~20% lower thermal resistance due to larger copper pad area - making SMAJ90CAH ideal for space-constrained layouts where 400W peak pulse capability suffices, and SMB preferred for higher-duty-cycle or thermally demanding deployments.
SMAJ90CAH 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ90CAH FAQ
1.How can I place an order for SMAJ90CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ90CAH 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 SMAJ90CAH reliable?
The price and inventory of SMAJ90CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ90CAH is usually 5 days.
3.What payment methods are accepted for SMAJ90CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ90CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ90CAH?
SMAJ90CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ90CAH 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 SMAJ90CAH?
For technical support, including SMAJ90CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ90CAH requirements.
6.How does Aetrix verify that SMAJ90CAH is sourced from the original manufacturer or authorized distributors?
All SMAJ90CAH 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 SMAJ90CAH meets industry standards.
7.What is the process for return or replacement of SMAJ90CAH?
All SMAJ90CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ90CAH, 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 SMAJ90CAH part is unused and in its original packaging.
Return procedure for SMAJ90CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ90CAH Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
