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Taiwan Semiconductor Corporation SMAJ100CH
- Part No.:
- SMAJ100CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ100CH.pdf
- Description:
- TVS DIODE 100VWM 179VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,025
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Product details
Overview
SMAJ100CH from Taiwan Semiconductor is a bidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 100V working stand-off voltage (VWM), 111–136V breakdown voltage (VBR), and 179V maximum clamping voltage (VC) at 1.7A peak impulse current - designed for automotive-grade surge protection in DC/DC converters and power supply inputs.
For engineers reviewing the SMAJ100CH datasheet, SMAJ100CH pinout, SMAJ100CH application, or SMAJ100CH equivalent, this device delivers AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, <1µA leakage above 100V, and robust 150°C junction operation - critical for reliable overvoltage hardening in harsh automotive and industrial environments.
Technical Context
The SMAJ100CH is a bidirectional TVS diode optimized for unidirectional or bidirectional transient suppression without polarity dependency. Its glass-passivated junction ensures stable VBR tolerance (±10% typical), while its low clamping ratio (VC/VBR ≈ 1.58) enables effective voltage limiting during 10/1000μs surges up to 400W.
It operates across –55°C to +150°C, supports 40A non-repetitive forward surge (IFSM), and maintains <1µA IR at VWM - enabling use in high-reliability systems where leakage-induced standby loss or thermal drift must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 100 V - maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 111 V / 136 V at 1 mA - precise breakdown threshold for predictable turn-on under transients |
| VC @ IPPM | 179 V at 1.7 A - clamped voltage during 10/1000μs surge, limiting downstream IC stress |
| PPPM | 400 W - peak pulse power handling per 10/1000μs waveform, derated above 25°C |
| IR @ VWM | <1 µA - negligible leakage at rated stand-off, preserving system efficiency |
| TJ max | +150 °C - extended thermal capability for under-hood or enclosed power electronics |
| Package | DO-214AC (SMA) - surface-mount footprint compatible with automated assembly and IPC-7351B standard |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with matte tin-plated leads, polarity indicated by cathode band; weight ≈ 0.060 g; meets UL 94V-0 and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Transient current entry (bidirectional) | Accepts surge energy in either polarity; no fixed anode/cathode function due to symmetrical structure |
| Cathode (banded end) | Transient current exit (bidirectional) | Provides low-impedance path to ground or return rail during clamping; band marks terminal for orientation during placement |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including temperature cycling, humidity bias, and mechanical shock per stress test requirements |
| ISO 7637-2 compliant | Withstands standardized vehicle electrical transients (Pulse 1, 2a, 2b, 3a, 3b) without degradation or failure |
| Fast response time <1 ps | Clamps within picoseconds of transient onset - faster than most microcontroller I/O or power MOSFET gate thresholds |
| Glass-passivated junction | Ensures long-term VBR stability and low parameter drift under thermal and humidity stress |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement prior to reflow - simplifies SMT line integration |
Applications
| Automotive On-Board DC/DC Converter | Industrial Switching Mode Power Supply (SMPS) |
|---|---|
Use Scenario: Protecting 12V-to-5V/3.3V buck converter input against load dump and alternator ripple in passenger vehicles. IC Role / Device Role / Timing Role: Bidirectional clamping element placed upstream of input filter capacitor and controller IC. Use Value: Limits transient voltage to ≤179V during 100V load dump events, preventing controller latch-up or MOSFET avalanche failure. | Use Scenario: Safeguarding primary-side rectifier output in telecom-grade 48V SMPS subjected to lightning-induced surges on AC mains input. IC Role / Device Role / Timing Role: Secondary-side TVS across bulk capacitor terminals to absorb coupled differential-mode transients. Use Value: Absorbs 400W peak pulses without degradation, maintaining output regulation integrity during EN 61000-4-5 Level 4 testing. |
| LED Driver for Commercial Lighting | Automotive USB-C Power Delivery Module |
Use Scenario: Suppressing switching noise and ESD in constant-current LED drivers used in streetlight and parking garage fixtures. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver IC supply pins and output terminals. Use Value: Clamps fast-rising ESD events (<1ns rise time) before they damage PWM controller or current-sense amplifier inputs. | Use Scenario: Hardening 12V/20V input rails of USB-C PD controllers in vehicle infotainment head units exposed to battery reversal and jump-start spikes. IC Role / Device Role / Timing Role: Front-end transient protector between fuse and PD controller's VBUS input. Use Value: Withstands ±100V reverse battery transients and clamps jump-start surges to <179V, ensuring PD controller remains functional. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ100A | Unidirectional; VBR = 111–123V; VC = 162V at 1.9A; same VWM and PPPM | Requires correct polarity placement; not suitable for AC-coupled or floating-bus systems | Select SMAJ100A only when circuit topology guarantees consistent polarity and ground reference. |
| SMBJ100CA | DO-214AA (SMB) package; same VWM/VBR/VC specs; 600W PPPM rating | Larger footprint; higher surge margin but incompatible with SMA land pattern | Choose SMBJ100CA only if board layout allows SMB pad revision and higher surge headroom is required. |
Compared with SMAJ100A and SMBJ100CA, the SMAJ100CH provides bidirectional protection in the compact DO-214AC footprint with AEC-Q101 validation - making it optimal for space-constrained automotive modules where polarity-agnostic surge immunity is mandatory.
Availability
SMAJ100CH is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial DC/DC converters, and commercial LED lighting requiring stable component supply with full traceability and lifecycle support.
Supply support for SMAJ100CH 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, MOSFETs, and power management devices.
The SMAJ series was developed specifically for AEC-Q101-compliant automotive transient suppression, emphasizing low clamping ratio, high reliability under thermal cycling, and compatibility with lead-free reflow profiles.
FAQ
What does the "CH" suffix indicate in SMAJ100CH?
The "CH" suffix in SMAJ100CH denotes a bidirectional configuration with AEC-Q101 qualification. Unlike unidirectional variants (e.g., SMAJ100AH), the CH version has symmetrical breakdown characteristics in both polarities and is tested to automotive reliability standards including temperature cycling, highly accelerated stress testing, and mechanical shock.
Does SMAJ100CH meet ISO 7637-2 Pulse 5a (load dump) requirements?
SMAJ100CH is rated for ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b - but not Pulse 5a (load dump), which requires higher energy absorption (≥1000W). For Pulse 5a, a higher-power TVS such as 5.0SMDJ100A or stacked TVS array is required. SMAJ100CH is intended for lower-energy transients upstream of load dump protection stages.
What is the maximum clamping voltage of SMAJ100CH at 10/1000μs waveform?
The maximum clamping voltage (VC) of SMAJ100CH is 179 V at 1.7 A peak impulse current under the standardized 10/1000μs double-exponential waveform. This value is guaranteed across –55°C to +150°C and defines the upper voltage limit imposed on protected circuitry during surge events.
Can SMAJ100CH be used in place of SMAJ100A in existing designs?
No - SMAJ100CH is bidirectional while SMAJ100A is unidirectional. Substituting SMAJ100CH for SMAJ100A may cause unintended conduction in reverse-biased conditions. Layout and schematic review is required to confirm polarity independence before replacement; the cathode band marking on SMAJ100CH serves only for mechanical orientation, not electrical polarity.
Is SMAJ100CH RoHS and halogen-free compliant?
Yes, SMAJ100CH is RoHS compliant and halogen-free per IEC 61249-2-21. The molding compound meets UL 94V-0 flammability rating, and the matte tin-plated leads comply with J-STD-002 solderability requirements - confirming suitability for lead-free reflow processes and environmentally regulated markets.
SMAJ100CH 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:
- 179V
- Current - Peak Pulse (10/1000µs):
- 1.7A
- 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)
SMAJ100CH FAQ
1.How can I place an order for SMAJ100CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ100CH 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 SMAJ100CH reliable?
The price and inventory of SMAJ100CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ100CH is usually 5 days.
3.What payment methods are accepted for SMAJ100CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ100CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ100CH?
SMAJ100CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ100CH 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 SMAJ100CH?
For technical support, including SMAJ100CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ100CH requirements.
6.How does Aetrix verify that SMAJ100CH is sourced from the original manufacturer or authorized distributors?
All SMAJ100CH 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 SMAJ100CH meets industry standards.
7.What is the process for return or replacement of SMAJ100CH?
All SMAJ100CH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ100CH, 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 SMAJ100CH part is unused and in its original packaging.
Return procedure for SMAJ100CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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