My Inquiry
My Account
Taiwan Semiconductor Corporation SMAJ22CAH
- Part No.:
- SMAJ22CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22CAH.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,336
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ22CAH from Taiwan Semiconductor is a bidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade overvoltage protection with 22V working stand-off voltage, 24.4–26.9V breakdown range at 1mA test current, and 35.5V clamping voltage at 11.3A peak impulse current. It protects DC/DC converters and lighting circuits against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMAJ22CAH datasheet, SMAJ22CAH pinout, SMAJ22CAH application, or SMAJ22CAH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 150°C junction temperature rating, moisture sensitivity level 1 compliance, and DO-214AC mechanical compatibility with automated SMT placement.
Technical Context
The SMAJ22CAH 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 22V). Its bidirectional configuration enables symmetrical clamping in AC-coupled or floating rail applications without polarity constraints.
It meets ISO 7637-2 immunity requirements for automotive electronics and delivers 400W peak pulse power (10/1000µs waveform) up to 78V VWM, derating linearly above 25°C ambient per Fig.2. The device operates across –55°C to +150°C junction temperature range with UL 94V-0 mold compound and matte tin-plated leads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before significant leakage begins |
| VBR @ IT=1mA | 24.4–26.9 V - Verified breakdown threshold ensuring reliable turn-on during transients |
| VC @ IPPM=11.3A | 35.5 V - Clamped voltage limiting downstream IC stress during 10/1000µs surge events |
| PPPM | 400 W - Peak pulse power handling capacity under standard 10/1000µs waveform |
| IR @ VWM | <1 µA - Minimal standby leakage preserving system efficiency in low-power modes |
| TJ max | +150 °C - Enables deployment in under-hood automotive environments without thermal derating |
| AEC-Q101 | Qualified - Validated for automotive electronic systems per stress test requirements |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band marking; dual-terminal construction supporting bidirectional operation. Matte tin-plated leads meet J-STD-002 solderability and JESD 201 Class 2 whisker resistance requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bidirectional) | Transient conduction path | Either terminal serves as anode or cathode depending on instantaneous polarity of surge event |
| Cathode band (marking) | Polarity indicator | Visible band denotes conventional cathode location; irrelevant for bidirectional function but required for unidirectional variants |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics including engine control units and body modules |
| Glass passivated junction | Enhances long-term reliability and stability under thermal cycling and humidity exposure |
| Fast response time <1.0ps | Clamps transients before sensitive downstream circuitry experiences overvoltage damage |
| ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance | Meets OEM-level electromagnetic immunity requirements for 12V/24V vehicle networks |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking or special handling prior to assembly |
Applications
| Automotive Infotainment Power Rails | LED Headlamp Driver Protection |
|---|---|
|
Use Scenario: Protects USB-C PD and CAN-FD power rails in head unit and display modules from load dump and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed at input filter stage to limit voltage excursions to ≤35.5V during ISO 7637-2 Pulse 2b events. Use Value: Prevents latch-up or permanent damage to PMICs and microcontrollers by maintaining rail integrity below 40V absolute maximum ratings. |
Use Scenario: Shields constant-current LED driver ICs from inductive kickback during PWM dimming and relay switching in adaptive front-lighting systems. IC Role / Device Role / Timing Role: Fast-clamping TVS placed across driver output to absorb 400W energy spikes within 10/1000µs waveform envelope. Use Value: Extends LED module lifetime by eliminating voltage overshoot exceeding 35.5V that would otherwise degrade bond wires or phosphor layers. |
| On-board DC/DC Converter Input | Industrial Lighting Ballast Control |
|
Use Scenario: Safeguards 24V-to-5V buck converter inputs in commercial vehicle telematics gateways exposed to alternator ripple and battery disconnect surges. IC Role / Device Role / Timing Role: Primary overvoltage suppression element upstream of EMI filter, rated for 22V nominal rail with 35.5V clamping ceiling. Use Value: Ensures uninterrupted operation of isolated CAN transceivers and sensor interfaces by holding input voltage within safe operating area during 100V/50ms load dump events. |
Use Scenario: Protects DALI and 0–10V dimming controllers in high-bay LED fixtures subjected to lightning-induced surges on 230V AC mains feeders. IC Role / Device Role / Timing Role: Secondary-level TVS on low-voltage control side, clamping induced transients from coupled AC lines to ≤35.5V. Use Value: Maintains communication integrity and prevents false dimming commands by suppressing noise above 22V working stand-off without false triggering. |
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 SMAJ22CA | Identical electrical specs (VWM=22V, VC=35.5V), same DO-214AC package, AEC-Q101 qualified | No functional difference; validated in identical automotive test profiles including ISO 7637-2 | Select when requiring dual-source supply chain assurance or alternate logistics channel |
| ON Semiconductor SMAJ22CA | VBR range 24.4–26.9V matches; clamping voltage 35.5V; same 400W rating and DO-214AC footprint | Same AEC-Q101 qualification scope and moisture sensitivity level 1 handling | Prefer for designs already using ON Semi analog portfolio to simplify qualification documentation |
Compared with SMAJ22CAH, Littelfuse SMAJ22CA offers identical clamping performance and automotive qualification, while ON Semiconductor SMAJ22CA provides equivalent surge handling and thermal robustness-both serve as drop-in alternatives where second-source validation is required without layout or BOM revision.
Availability
SMAJ22CAH is available at Aetrix Electronics and suitable for automotive infotainment systems, LED lighting drivers, and on-board DC/DC converters requiring stable component supply with AEC-Q101 traceability and full production lifecycle support.
Supply support for SMAJ22CAH 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 automotive and industrial certifications.
The SMAJ series was developed specifically for AEC-Q101-compliant transient protection in 12V/24V automotive subsystems, emphasizing fast response, high surge robustness, and zero-bake SMT compatibility.
FAQ
What does the 'CAH' suffix indicate in SMAJ22CAH?
The 'CAH' suffix in SMAJ22CAH denotes a bidirectional configuration ('C'), AEC-Q101 qualification ('A'), and halogen-free packaging ('H'). This distinguishes it from unidirectional 'AH' variants and confirms compliance with automotive reliability standards and environmental regulations. SMAJ22CAH maintains symmetrical clamping behavior across both polarities, making it suitable for AC-coupled or floating-rail protection schemes where polarity cannot be guaranteed.
How does SMAJ22CAH differ from SMAJ22AH?
SMAJ22CAH is bidirectional, while SMAJ22AH is unidirectional. SMAJ22CAH clamps transients of either polarity at 35.5V, whereas SMAJ22AH only clamps in reverse bias and conducts forward current up to 3.5V. The 'C' in SMAJ22CAH enables use in differential signal lines or non-polarized DC rails, eliminating need for orientation-aware placement during SMT assembly. Both share identical VWM, VBR, and PPPM ratings.
Is SMAJ22CAH compatible with lead-free reflow profiles?
Yes, SMAJ22CAH supports standard lead-free reflow profiles up to 260°C peak temperature. Its DO-214AC package uses matte tin-plated leads compliant with J-STD-002 and withstands JEDEC J-STD-020 Level 1 moisture sensitivity without pre-baking. The UL 94V-0 molding compound ensures thermal stability during multiple reflow cycles, and the device maintains full electrical specification compliance after exposure to IPC/JEDEC-standard thermal stress.
What is the maximum clamping voltage of SMAJ22CAH under surge conditions?
The maximum clamping voltage of SMAJ22CAH is 35.5V at 11.3A peak impulse current (IPPM) under the standardized 10/1000µs double-exponential waveform. This value is guaranteed across the full operating temperature range (–55°C to +150°C) and represents the upper limit of voltage seen by protected circuitry during worst-case transient events, enabling precise margining against downstream IC absolute maximum ratings.
Does SMAJ22CAH meet ISO 7637-2 Pulse 5a (load dump) requirements?
No, SMAJ22CAH is rated for ISO 7637-2 Pulses 1, 2a, 2b, 3a, and 3b only-not Pulse 5a (load dump), which requires higher energy absorption (≥1000W). SMAJ22CAH's 400W peak pulse power rating is insufficient for direct load dump suppression; it must be used downstream of primary load dump protectors (e.g., TVS arrays or active clamps) or in conjunction with series impedance to limit current during such events.
SMAJ22CAH 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:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 11.3A
- 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)
SMAJ22CAH FAQ
1.How can I place an order for SMAJ22CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22CAH 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 SMAJ22CAH reliable?
The price and inventory of SMAJ22CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22CAH is usually 5 days.
3.What payment methods are accepted for SMAJ22CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22CAH?
SMAJ22CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22CAH 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 SMAJ22CAH?
For technical support, including SMAJ22CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22CAH requirements.
6.How does Aetrix verify that SMAJ22CAH is sourced from the original manufacturer or authorized distributors?
All SMAJ22CAH 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 SMAJ22CAH meets industry standards.
7.What is the process for return or replacement of SMAJ22CAH?
All SMAJ22CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22CAH, 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 SMAJ22CAH part is unused and in its original packaging.
Return procedure for SMAJ22CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ22CAH 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…
