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Taiwan Semiconductor Corporation SMAJ100CA
- Part No.:
- SMAJ100CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ100CA.pdf
- Description:
- TVS DIODE 100VWM 162VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,038
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Product details
Overview
SMAJ100CA from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 100 V working stand-off voltage (VWM), 111–123 V breakdown voltage (VBR), 162 V maximum clamping voltage (VC) at 1.9 A peak impulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - deployed in automotive power supplies and industrial DC/DC converters.
For engineers reviewing the SMAJ100CA datasheet, SMAJ100CA pinout, SMAJ100CA application, or SMAJ100CA equivalent, key selection criteria include bidirectional clamping performance, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, DO-214AC (SMA) package compatibility, and low leakage (<1 µA @ 100 V) in high-impedance monitoring circuits.
Technical Context
The SMAJ100CA implements a glass-passivated silicon avalanche junction optimized for fast transient suppression with sub-1 ps response from 0 V to VBR min. Its bidirectional configuration enables symmetric clamping in AC-coupled or floating bus applications without polarity constraints.
Rated for 150 °C maximum junction temperature and -55 °C to +150 °C operating range, it supports automotive under-hood environments and industrial power systems. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements in its DO-214AC molded package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 100 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin above system nominal rail (e.g., 48 V or 72 V DC buses). |
| VBR @ IT=1 mA | 111–123 V - Breakdown threshold range; ensures reliable triggering during transients exceeding normal operating voltage by ≥11%. |
| VC @ IPPM=1.9 A | 162 V - Clamped voltage under 10/1000 µs surge; limits downstream IC stress to <162 V during 400 W transient events. |
| IR @ VWM | <1 µA - Ultra-low reverse leakage preserves signal integrity and battery life in always-on monitoring circuits. |
| PPPM | 400 W - Peak pulse power handling per standard 10/1000 µs waveform; sufficient for ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 2b (load dump simulation). |
| TJ max | 150 °C - Enables operation in under-hood automotive modules and enclosed industrial enclosures without derating below ambient 125 °C. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, bi-directional, cathode band not applicable (symmetrical terminals).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (reversible) | Bidirectional avalanche junction terminals | No polarity marking required; either terminal serves as anode or cathode depending on transient polarity - simplifies PCB layout and eliminates orientation errors. |
| Case (body) | Non-electrical mechanical interface | UL 94V-0 rated epoxy molding provides flame resistance and mechanical stability; matte tin-plated leads ensure J-STD-002 solderability. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | Typically <1.0 ps from 0 V to VBR min - ensures clamping activation before sensitive logic or analog circuitry sustains damage. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive spike), Pulse 2a/2b (battery disconnect/load dump), and Pulse 3a/3b (capacitive coupling) - meets OEM automotive EMC requirements out-of-box. |
| Moisture sensitivity level | MSL Level 1 (per J-STD-020) - allows unlimited floor life and reflow without baking, reducing manufacturing overhead. |
| Halogen-free construction | Complies with IEC 61249-2-21 - satisfies RoHS and environmental compliance mandates for export to EU, Japan, and China. |
Applications
| Automotive Power Distribution | Industrial DC/DC Converters |
|---|---|
|
Use Scenario: Protection of 12 V/24 V/48 V vehicle power networks against load dump, jump-start surges, and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed at ECU input stage to shunt transients >100 V before reaching PMIC or microcontroller LDOs. Use Value: Limits clamped voltage to 162 V under 400 W pulses, preventing latch-up or gate oxide rupture in downstream 3.3 V/5 V logic. |
Use Scenario: Input rail protection in isolated 48 V-to-12 V DC/DC modules used in factory automation controllers. IC Role / Device Role / Timing Role: Primary overvoltage guard on secondary-side output, absorbing reflected transients from motor drive switching noise. Use Value: Sub-1 µA leakage avoids loading feedback resistors; DO-214AC footprint enables compact placement near connector entry points. |
| LED Driver Power Supplies | Telecom Line Interface Cards |
|
Use Scenario: Surge suppression on constant-current LED driver inputs exposed to outdoor lightning-induced surges in streetlight systems. IC Role / Device Role / Timing Role: First-line defense against 1 kV/1.2 × 50 µs common-mode transients coupled onto AC/DC front-end rectifiers. Use Value: 400 W rating handles multiple repetitive surges per IEC 61000-4-5 Level 3; bidirectional symmetry accommodates AC-coupled input stages. |
Use Scenario: Protection of Ethernet PHY power pins and auxiliary bias rails in carrier-grade line cards subjected to induced surges from nearby power cables. IC Role / Device Role / Timing Role: Localized clamping element adjacent to PoE PD controller ICs, suppressing differential-mode spikes before they propagate into data lanes. Use Value: 162 V clamping ensures PHY supply rails remain within absolute maximum ratings; MSL Level 1 supports automated SMT assembly without moisture concerns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ100CA (Bourns) | Same DO-214AA package; 400 W rating but lower VC = 160 V @ 1.9 A; slightly tighter VBR tolerance (111–122 V). | Preferred where board space permits larger SMB footprint and lower clamping voltage is critical for 3.3 V logic interfaces. | Select SMBJ100CA only if layout allows DO-214AA and clamping margin must be ≤160 V; SMAJ100CA offers superior fit in space-constrained DO-214AC layouts. |
| P6SMB100CA (ON Semiconductor) | Identical DO-214AA package and electrical specs; certified to AEC-Q101; higher production volume and broader distributor stock. | Required for automotive qualification programs needing AEC-Q101 documentation and PPAP support. | Choose P6SMB100CA when automotive qualification is mandatory; SMAJ100CA remains optimal for industrial and telecom cost-sensitive designs. |
Compared with SMBJ100CA and P6SMB100CA, the SMAJ100CA delivers identical 100 V stand-off and 400 W surge capability in the smaller DO-214AC footprint - enabling higher component density while maintaining ISO 7637-2 compliance and <1 µA leakage at full VWM.
Availability
SMAJ100CA is available at Aetrix Electronics and suitable for automotive power distribution, industrial DC/DC converters, LED driver power supplies, and telecom line interface cards requiring stable component supply across multi-year production cycles.
Supply support for SMAJ100CA 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 with global distribution and AEC-Q101 qualified product lines.
The SMAJ series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing fast response, low leakage, and robust package reliability under thermal cycling and humidity stress.
FAQ
What does the "CA" suffix indicate in SMAJ100CA?
The "CA" suffix in SMAJ100CA denotes a bidirectional configuration - meaning the device clamps transients of either polarity symmetrically across its terminals. Unlike unidirectional variants (e.g., SMAJ100A), SMAJ100CA has no cathode marking and functions identically regardless of voltage polarity, making it ideal for AC-coupled or floating-bus applications where polarity cannot be guaranteed. This is confirmed in the official TSC datasheet Section "Devices for Bipolar Applications".
Is SMAJ100CA compliant with automotive EMC standards?
Yes, SMAJ100CA meets ISO 7637-2 requirements for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection and load dump), and Pulse 3a/3b (capacitive coupling). Its 400 W peak pulse power rating and 162 V clamping voltage under 10/1000 µs waveform ensure robust immunity in 12 V and 24 V vehicle networks. These test validations are explicitly stated in the "FEATURES" section of the Taiwan Semiconductor U2102 datasheet.
What is the maximum clamping voltage of SMAJ100CA and at what current is it specified?
The maximum clamping voltage (VC) of SMAJ100CA is 162 V, measured at a peak impulse current (IPPM) of 1.9 A using the standardized 10/1000 µs double-exponential waveform. This value is guaranteed across temperature and process variation, and appears in the "ELECTRICAL SPECIFICATIONS" table on page 3 of the U2102 datasheet under the SMAJ100A row - applicable to SMAJ100CA due to identical electrical characteristics in both directions.
Does SMAJ100CA require special handling during PCB assembly?
No - SMAJ100CA is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and can be placed directly into reflow without pre-baking. Its matte tin-plated leads comply with J-STD-002 for solderability, and the DO-214AC package withstands standard lead-free reflow profiles up to 260 °C peak. These attributes are documented in the "MECHANICAL DATA" and "FEATURES" sections of the TSC datasheet.
How does SMAJ100CA differ from SMAJ100A?
SMAJ100A is unidirectional with a cathode band marking and specified clamping only in reverse bias; SMAJ100CA is bidirectional with no polarity marking and identical clamping performance in both directions. Electrically, their VWM, VBR, VC, and PPPM values are identical, but SMAJ100CA supports AC or floating applications where voltage polarity reverses - such as in RS-485 bias networks or transformer-coupled power inputs. This distinction is defined in the "Devices for Bipolar Applications" note on page 2 of the datasheet.
SMAJ100CA 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):
- 100V
- Voltage - Breakdown (Min):
- 111V
- Voltage - Clamping (Max) @ Ipp:
- 162V
- 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)
SMAJ100CA FAQ
1.How can I place an order for SMAJ100CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ100CA 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 SMAJ100CA reliable?
The price and inventory of SMAJ100CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ100CA is usually 5 days.
3.What payment methods are accepted for SMAJ100CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ100CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ100CA?
SMAJ100CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ100CA 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 SMAJ100CA?
For technical support, including SMAJ100CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ100CA requirements.
6.How does Aetrix verify that SMAJ100CA is sourced from the original manufacturer or authorized distributors?
All SMAJ100CA 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 SMAJ100CA meets industry standards.
7.What is the process for return or replacement of SMAJ100CA?
All SMAJ100CA units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ100CA, 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 SMAJ100CA part is unused and in its original packaging.
Return procedure for SMAJ100CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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