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Taiwan Semiconductor Corporation SMAJ13CH
- Part No.:
- SMAJ13CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ13CH.pdf
- Description:
- TVS DIODE 13VWM 23.8VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,118
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Product details
Overview
SMAJ13CH from Taiwan Semiconductor is a unidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade overvoltage protection with 13V working stand-off voltage, 14.4–17.6V breakdown range at 1mA test current, and 23.8V clamping voltage at 16.8A peak pulse current. It meets AEC-Q101 qualification and ISO 7637-2 Pulse 1/2a/2b/3a/3b for robust vehicle electrical system protection.
For engineers reviewing the SMAJ13CH datasheet, SMAJ13CH pinout, SMAJ13CH application, or SMAJ13CH equivalent, this page delivers verified electrical parameters, bidirectional capability context (CH suffix), clamping performance under 10/1000μs waveform, thermal limits up to 150°C junction temperature, and direct alternatives for automotive power rail and DC/DC converter surge suppression.
Technical Context
The SMAJ13CH implements a glass-passivated silicon junction optimized for fast transient response (<1.0ps rise time from 0V to VBR min) and low leakage (<1μA at VWM). Its unidirectional configuration provides polarity-sensitive clamping on positive transients only, with cathode band marking per DO-214AC mechanical standard.
It operates across -55°C to +150°C junction temperature range, supports 40A non-repetitive forward surge (8.3ms half-sine), and delivers 400W peak pulse power at 25°C - derated linearly above ambient per Fig.2. The device is rated for moisture sensitivity level 1 (J-STD-020) and RoHS/halogen-free compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 13 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1mA | 14.4–17.6 V - Breakdown voltage range defining reliable turn-on threshold under standardized test |
| VC @ IPPM=16.8A | 23.8 V - Clamped voltage during 10/1000μs surge, limiting downstream component stress |
| PPPM | 400 W - Peak pulse power handling at 25°C, sufficient for ISO 7637-2 Pulse 1 (inductive load dump) |
| IR @ VWM | <1 μA - Ultra-low reverse leakage ensures minimal standby power loss in battery-critical systems |
| TJ max | +150 °C - Enables placement near hot components (e.g., power MOSFETs, inductors) without derating |
| Package | DO-214AC (SMA) - Surface-mount outline with 0.060g mass, UL 94V-0 molding, matte tin leads |
Pinout & Package
DO-214AC (SMA) package: single-ended, two-terminal surface-mount device with cathode band marking indicating terminal polarity. Cathode (K) is marked; anode (A) is unmarked. Leads are matte tin-plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry point during forward conduction | Connects to protected line's lower-potential side (e.g., ground return path in uni-directional clamp) |
| Cathode (banded end) | Current exit point during reverse clamping | Connects to protected line's higher-potential side (e.g., 12V rail); defines clamping direction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood applications including temperature cycling, humidity, and mechanical shock |
| Glass passivated junction | Enhances long-term reliability and stability of VBR and leakage under thermal stress |
| Fast response time <1.0ps | Clamps ESD and fast transients before sensitive ICs experience overstress |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Complies with full suite of automotive supply-line transient immunity requirements |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking or special handling |
Applications
| Automotive Power Rail Protection | On-Board DC/DC Converter Input |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs against load dump and alternator transients per ISO 7637-2 Pulse 1. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and ECU input filter to clamp surges above 13V. Use Value: Limits peak voltage to 23.8V at 16.8A, preventing damage to downstream LDOs and microcontrollers. | Use Scenario: Safeguarding buck converter input stage from coupled noise and switching spikes in ADAS camera modules. IC Role / Device Role / Timing Role: Primary surge suppressor at DC/DC input capacitor node, absorbing 10/1000μs transients before regulation. Use Value: Maintains <1μA leakage at 13V, avoiding quiescent current penalty in always-on subsystems. |
| Industrial SMPS Secondary Side | LED Driver Overvoltage Clamp |
Use Scenario: Securing secondary-side control circuitry in telecom power supplies exposed to back-EMF from relay coils. IC Role / Device Role / Timing Role: Fast-clamping TVS across optocoupler input or feedback resistor network. Use Value: Sub-1ps response ensures clamping occurs before 5V logic inputs exceed absolute maximum ratings. | Use Scenario: Preventing LED string overvoltage during open-circuit fault conditions in constant-current drivers. IC Role / Device Role / Timing Role: Parallel-connected TVS across output terminals to shunt excess energy during fault events. Use Value: 400W peak power rating handles brief overvoltage pulses without thermal runaway or degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ13AHE3/5A | Same DO-214AC package, identical VWM/VBR/VC specs, AEC-Q101 qualified, but uses different marking code and tape/reel packaging | No functional difference; validated for same ISO 7637-2 pulses and automotive temperature profile | Select when dual-sourcing or requiring Littelfuse logistics support |
| ON Semiconductor SMAJ13A | Unidirectional variant with tighter VBR tolerance (14.4–15.9V vs. 14.4–17.6V), same clamping and power rating | Better suited for designs requiring tighter breakdown consistency, e.g., precision rail monitoring circuits | Choose for improved VBR distribution control where statistical variation must be minimized |
Compared with SMAJ13CH, SMAJ13AHE3/5A offers identical electrical behavior and qualification with alternate supply chain access, while SMAJ13A provides narrower breakdown spread at the cost of reduced VBR margin-critical for designs balancing clamping headroom against false-trigger risk.
Availability
SMAJ13CH is available at Aetrix Electronics and suitable for automotive electronics, industrial SMPS, LED driver protection, and on-board DC/DC converter designs requiring stable component supply and AEC-Q101-compliant surge suppression.
Supply support for SMAJ13CH 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 Company (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in high-reliability protection devices, rectifiers, and TVS diodes for automotive and industrial markets.
The SMAJ series was developed specifically for AEC-Q101-compliant transient suppression in 12V/24V automotive power networks, emphasizing robust clamping, low leakage, and process-controlled VBR consistency across temperature.
FAQ
What does the "CH" suffix indicate in SMAJ13CH?
The "CH" suffix in SMAJ13CH denotes a unidirectional TVS diode with cathode band marking and standard DO-214AC (SMA) packaging. Unlike "CAH" variants, SMAJ13CH is not bidirectional-it clamps only positive transients relative to its cathode terminal. This configuration matches common 12V rail protection topologies where polarity is fixed and reverse conduction is not required. SMAJ13CH maintains full AEC-Q101 qualification and ISO 7637-2 compliance.
How does SMAJ13CH perform under elevated ambient temperatures?
SMAJ13CH is rated for operation from -55°C to +150°C junction temperature. Its peak pulse power de-rates linearly above 25°C ambient per Fig.2 in the datasheet: at 85°C ambient, it retains ~70% of 400W rating (~280W). The 150°C TJ max allows placement near heat sources like power inductors or MOSFETs without additional thermal relief. SMAJ13CH's glass-passivated junction ensures VBR stability across this full range.
Is SMAJ13CH compatible with lead-free reflow processes?
Yes, SMAJ13CH is fully compatible with lead-free reflow soldering per J-STD-020 Level 1 moisture sensitivity classification-no pre-baking required. Its matte tin-plated leads meet J-STD-002 solderability standards, and the UL 94V-0 molding compound withstands peak reflow temperatures up to 260°C. The DO-214AC package geometry supports automated pick-and-place and standard stencil printing for high-yield manufacturing.
What is the clamping voltage of SMAJ13CH at its rated peak pulse current?
SMAJ13CH has a maximum clamping voltage (VC) of 23.8 V at 16.8 A peak pulse current (IPPM) under the standard 10/1000μs waveform. This value is measured per JEDEC test conditions and represents the upper limit of voltage seen by downstream circuitry during worst-case transient events. The low VC relative to VWM (13 V) provides 10.8 V of clamping headroom, critical for protecting 15 V-tolerant interface ICs in automotive applications.
Does SMAJ13CH meet automotive electromagnetic compatibility standards?
Yes, SMAJ13CH is explicitly validated to meet ISO 7637-2 for automotive transient immunity, covering Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling). Its sub-1ps response time and 400W pulse power rating ensure effective suppression of fast-rising, high-energy disturbances common in vehicle electrical systems. AEC-Q101 qualification further confirms reliability under vibration, thermal cycling, and humidity stress relevant to EMC robustness.
SMAJ13CH 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):
- 13V
- Voltage - Breakdown (Min):
- 14.4V
- Voltage - Clamping (Max) @ Ipp:
- 23.8V
- Current - Peak Pulse (10/1000µs):
- 16.8A
- 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)
SMAJ13CH FAQ
1.How can I place an order for SMAJ13CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ13CH 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 SMAJ13CH reliable?
The price and inventory of SMAJ13CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ13CH is usually 5 days.
3.What payment methods are accepted for SMAJ13CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ13CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ13CH?
SMAJ13CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ13CH 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 SMAJ13CH?
For technical support, including SMAJ13CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ13CH requirements.
6.How does Aetrix verify that SMAJ13CH is sourced from the original manufacturer or authorized distributors?
All SMAJ13CH 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 SMAJ13CH meets industry standards.
7.What is the process for return or replacement of SMAJ13CH?
All SMAJ13CH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ13CH, 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 SMAJ13CH part is unused and in its original packaging.
Return procedure for SMAJ13CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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