My Inquiry
My Account
Taiwan Semiconductor Corporation SMAJ22C
- Part No.:
- SMAJ22C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22C.pdf
- Description:
- 400W, 27.1V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:8,346
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ22C from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 22V working stand-off voltage (VWM), 24.4–29.8V breakdown voltage (VBR @ 1mA), and 39.4V maximum clamping voltage (VC) at 10.2A peak pulse current under 10/1000μs waveform - used for overvoltage protection in DC/DC converters and automotive power rails.
For engineers reviewing the SMAJ22C datasheet, SMAJ22C pinout, SMAJ22C application, or SMAJ22C equivalent, key selection criteria include clamping performance at 10.2A, unidirectional polarity marking, DO-214AC thermal derating above 25°C, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive transients.
Technical Context
The SMAJ22C operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds VBR (min 24.4V), clamping transients to ≤39.4V at 10.2A. Its glass-passivated junction ensures stable breakdown and low leakage (<1μA at 22V).
Designed for single-pulse 10/1000μs waveforms, it delivers 400W peak pulse power at TA = 25°C, derating linearly above that temperature per Fig.2; maximum junction temperature is 150°C, with storage range from –55°C to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1mA | 24.4–29.8 V - Confirmed breakdown range ensuring reliable turn-on margin above VWM |
| VC @ IPPM=10.2A | 39.4 V - Clamped voltage during 10/1000μs surge, defining protected circuit's max stress level |
| PPPM | 400 W - Peak pulse power handling capability at 25°C ambient, critical for transient energy absorption |
| IR @ VWM | <1 μA - Ultra-low reverse leakage preserves system efficiency in standby and low-power modes |
| Package | DO-214AC (SMA) - Standardized surface-mount outline enabling automated placement and 1W steady-state dissipation |
Pinout & Package
DO-214AC (SMA) package with cathode band marking on one end; two-terminal device with anode and cathode leads. Matte tin-plated leads meet J-STD-002 solderability requirements and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference node | Connected to lower-potential side (e.g., GND or return path) in unidirectional protection configuration |
| Cathode | Clamping output / Surge current sink | Connected to protected line (e.g., 24V rail); conducts surge current to ground when VREV > VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| Fast response time <1.0 ps | Enables clamping before sensitive downstream ICs experience overvoltage stress during ESD or load dump events |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive 12V/24V system protection including battery disconnect and inductive switching transients |
| Moisture sensitivity level 1 (J-STD-020) | Eliminates bake requirement prior to reflow, reducing manufacturing cost and process complexity |
Applications
| Automotive Power Rail Protection | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: Protecting 24V supply lines in body control modules against load dump (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between rail and chassis ground, clamping surges within 1.0ps. Use Value: Limits peak voltage to 39.4V at 10.2A, preventing damage to 36V-rated regulators and microcontrollers. | Use Scenario: Safeguarding input stage of isolated 24V-to-5V DC/DC converters in factory automation PLCs. IC Role / Device Role / Timing Role: Primary overvoltage clamp on primary-side bus, absorbing repetitive switching spikes and EFT bursts. Use Value: 400W peak power rating sustains repeated 10/1000μs transients without degradation, supporting 10-year field life. |
| LED Driver Supply Protection | Telecom Power Adapter Interface |
Use Scenario: Shielding constant-current LED drivers from induced surges on long cable runs in outdoor signage systems. IC Role / Device Role / Timing Role: Standoff-rated TVS (VWM = 22V) placed across driver input terminals to shunt lightning-induced transients. Use Value: Low 1μA leakage avoids quiescent current penalty; DO-214AC footprint fits compact PCB layouts. | Use Scenario: Front-end surge suppression in universal-input AC/DC adapters for telecom base stations. IC Role / Device Role / Timing Role: Secondary-side transient clamp on 24V DC output rail, meeting IEC 61000-4-5 Level 3 requirements. Use Value: 39.4V clamping voltage ensures downstream PoE controllers remain within absolute maximum ratings during surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A | Narrower VBR range (24.4–26.9V) and lower VC (35.5V @ 11.3A); same DO-214AC package and 400W rating | Better clamping performance for tighter voltage margins; slightly higher IPPM (11.3A vs. 10.2A) | Select SMAJ22A when lower clamping voltage is prioritized over broader VBR tolerance |
| SMCJ22 | Higher power rating (1500W), larger DO-214AB (SMC) package, same VWM/VBR family; not pin-compatible | Used where higher single-pulse energy (e.g., ISO 7637-2 Pulse 5a) demands greater robustness | Choose SMCJ22 only if board layout allows larger footprint and thermal mass supports 1500W dissipation |
Compared with SMAJ22A and SMCJ22, the SMAJ22C offers balanced clamping voltage (39.4V), industry-standard DO-214AC fit, and verified ISO 7637-2 compliance - making it optimal for space-constrained automotive and industrial DC rail protection where 400W pulse handling suffices.
Availability
SMAJ22C is available at Aetrix Electronics and suitable for automotive power rail protection, industrial DC/DC converter input stages, and LED driver supply circuits requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ22C 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, rectifiers, and MOSFETs for industrial and automotive markets.
The SMAJ series was designed specifically for surface-mount transient suppression in harsh environments - emphasizing fast response, ISO 7637-2 compliance, and moisture-insensitive packaging for high-reliability 12V/24V systems.
FAQ
What is the polarity configuration of the SMAJ22C?
The SMAJ22C is a unidirectional TVS diode, marked with a cathode band indicating the cathode terminal. It conducts in reverse bias above its breakdown voltage (24.4–29.8V) and blocks up to 22V in forward direction. This configuration is essential for protecting positive-rail systems where ground-referenced clamping is required, and differs from bidirectional variants like SMAJ22CA which lack polarity marking and conduct symmetrically.
Does the SMAJ22C meet automotive transient standards?
Yes, the SMAJ22C meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements for 12V and 24V automotive electrical systems. Its 400W peak pulse power rating, sub-1ps response time, and validated clamping behavior under standardized surge waveforms make it suitable for ECU, BCM, and infotainment module protection - confirmed in Taiwan Semiconductor's U2102 datasheet revision.
What is the maximum clamping voltage of the SMAJ22C at rated current?
The SMAJ22C has a maximum clamping voltage (VC) of 39.4V at 10.2A peak pulse current (IPPM) under the standard 10/1000μs waveform. This value is measured per Figure 5 in the datasheet and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream components remain within their absolute maximum ratings.
How does the SMAJ22C differ from the SMAJ22A variant?
The SMAJ22C has a wider breakdown voltage range (24.4–29.8V) and higher clamping voltage (39.4V @ 10.2A), while the SMAJ22A specifies a tighter VBR range (24.4–26.9V) and lower clamping voltage (35.5V @ 11.3A). Both share the same DO-214AC package, 22V VWM, and 400W rating, but SMAJ22A provides improved voltage consistency for designs requiring tighter clamping control.
Is the SMAJ22C RoHS and halogen-free compliant?
Yes, the SMAJ22C is RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound meets UL 94V-0 flammability rating, and matte tin-plated leads satisfy J-STD-002 solderability requirements. Moisture sensitivity level is rated at Level 1 (J-STD-020), eliminating pre-reflow baking needs - confirmed in the "Features" and "Mechanical Data" sections of the U2102 datasheet.
SMAJ22C 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):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 39.4V
- Current - Peak Pulse (10/1000µs):
- 10.2A
- 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)
SMAJ22C FAQ
1.How can I place an order for SMAJ22C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22C 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 SMAJ22C reliable?
The price and inventory of SMAJ22C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22C is usually 5 days.
3.What payment methods are accepted for SMAJ22C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22C?
SMAJ22C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22C 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 SMAJ22C?
For technical support, including SMAJ22C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22C requirements.
6.How does Aetrix verify that SMAJ22C is sourced from the original manufacturer or authorized distributors?
All SMAJ22C 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 SMAJ22C meets industry standards.
7.What is the process for return or replacement of SMAJ22C?
All SMAJ22C units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22C, 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 SMAJ22C part is unused and in its original packaging.
Return procedure for SMAJ22C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ22C 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…
