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Taiwan Semiconductor Corporation SMAJ22AH
- Part No.:
- SMAJ22AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22AH.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,787
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Product details
Overview
SMAJ22AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 22 V working stand-off voltage (VWM), 24.4–26.9 V breakdown voltage (VBR) at 1 mA, 35.5 V maximum clamping voltage (VC) at 11.3 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - making it suitable for automotive-grade DC/DC converters and industrial power supplies.
For engineers reviewing the SMAJ22AH datasheet, SMAJ22AH pinout, SMAJ22AH application, or SMAJ22AH equivalent, key selection criteria include its AEC-Q101 qualification, DO-214AC (SMA) package compatibility with automated placement, low leakage (<1 µA at 22 V), and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance for automotive transients.
Technical Context
The SMAJ22AH operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve fast response (<1.0 ps from 0 V to VBR min) and stable clamping under repetitive surge events. Its thermal design supports continuous operation up to TJ = +150 °C, with steady-state power dissipation of 1 W and peak forward surge current rating of 40 A (8.3 ms half-sine).
It is rated for bidirectional use only when specified with CH or CAH suffixes; SMAJ22AH is strictly unidirectional, with polarity marked by cathode band. Moisture sensitivity level is J-STD-020 Level 1, and terminals are matte tin-plated per J-STD-002 solderability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before significant leakage begins |
| VBR min/max | 24.4 V / 26.9 V at IT = 1 mA - Ensures reliable avalanche initiation within tight tolerance for predictable clamping onset |
| VC @ IPPM | 35.5 V at 11.3 A - Limits downstream circuit voltage during 10/1000 µs surge, protecting 24 V logic and analog interfaces |
| PPPM | 400 W (10/1000 µs) - Sustains high-energy transients common in automotive load-dump and inductive switching |
| IR @ VWM | <1 µA - Minimizes standby power loss and avoids false triggering in low-current sensor circuits |
| TJ max | +150 °C - Enables deployment in under-hood automotive modules and enclosed industrial enclosures |
| Package | DO-214AC (SMA) - Standardized surface-mount footprint compatible with IPC-7351B land patterns and reflow profiles |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with matte tin-plated leads; cathode indicated by band marking; polarity-critical for unidirectional operation; weight ≈ 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; must be routed with low-inductance trace to maintain clamping speed |
| Cathode | High-side connection point | Connected to protected line (e.g., 24 V rail); marked by visible band; defines unidirectional conduction direction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD HBM/MM |
| Glass-passivated junction | Enhances long-term reliability and stability of VBR under thermal cycling and humidity exposure |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Fast response time | <1.0 ps - Enables suppression before sensitive ICs experience overvoltage stress in high-speed power systems |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally compliant manufacturing |
Applications
| Automotive On-Board DC/DC Converter | Industrial Switching Mode Power Supply (SMPS) |
|---|---|
Use Scenario: Protects 24 V input stage of buck converter powering ADAS camera module against load-dump transients up to ±100 V. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between input rail and chassis ground to shunt surge energy away from controller IC and MOSFET gate drivers. Use Value: Clamps peak voltage to ≤35.5 V at 11.3 A, preventing latch-up or gate oxide rupture in 30 V-rated power stages. | Use Scenario: Safeguards auxiliary 12 V output rail in telecom rectifier unit exposed to lightning-induced surges on AC input side. IC Role / Device Role / Timing Role: Primary-level transient suppressor mounted at secondary-side DC bus entry, coordinated with upstream MOV and fuse. Use Value: Delivers 400 W surge handling without degradation after repeated 10/1000 µs events, supporting >10-year field life in outdoor cabinets. |
| LED Driver for Commercial Lighting | Automotive Body Control Module (BCM) |
Use Scenario: Shields constant-current LED driver IC from inductive kickback generated by relay-controlled ballast switching in parking lot luminaires. IC Role / Device Role / Timing Role: Fast-acting unidirectional clamp across driver input capacitor, triggered within picoseconds of voltage rise. Use Value: Limits transient overshoot to <36 V, preserving 40 V-rated input capacitors and avoiding premature electrolytic failure. | Use Scenario: Protects LIN bus transceiver supply pins in BCM against battery reversal and jump-start spikes during service operations. IC Role / Device Role / Timing Role: Standoff-rated TVS on 5 V LDO output feeding LIN PHY, oriented anode-to-ground to block negative excursions. Use Value: Maintains <1 µA leakage at 5 V nominal, ensuring no impact on LIN idle-state current budget while clamping −30 V spikes to safe levels. |
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 | Same VWM (22 V), but VBR min/max = 24.4–27.1 V; VC = 36.0 V at 11.2 A; non-AEC-Q101 qualified | Lacks automotive qualification; not validated for ISO 7637-2 Pulse 2b or 3b | Select SMAJ22A only for cost-sensitive industrial or consumer applications where AEC-Q101 is not mandated. |
| SMBJ22AH | Same electrical specs (VWM=22 V, VBR=24.4–26.9 V, VC=35.5 V), but SMB package (DO-214AA) - 2.5 mm wider body, higher thermal mass | Lower power density; requires larger PCB area; better thermal performance under sustained surge duty cycles | Choose SMBJ22AH when board space allows and thermal derating margin is critical, e.g., in high-ambient-temperature engine control units. |
Compared with SMAJ22A and SMBJ22AH, SMAJ22AH uniquely combines AEC-Q101 qualification, DO-214AC footprint compactness, and verified ISO 7637-2 immunity - making it the optimal choice for space-constrained automotive modules requiring full compliance without layout redesign.
Availability
SMAJ22AH is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, and commercial lighting systems requiring stable component supply, consistent parametric performance, and full traceability through production lifecycles.
Supply support for SMAJ22AH 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 high-reliability transient suppression in automotive and industrial environments, emphasizing AEC-Q101 compliance, tight parameter distributions, and robust packaging for automated SMT assembly.
FAQ
What is the maximum clamping voltage of SMAJ22AH under standard 10/1000 µs surge conditions?
The SMAJ22AH has a maximum clamping voltage (VC) of 35.5 V when subjected to its rated peak pulse current of 11.3 A using the 10/1000 µs waveform. This value is measured per JEDEC standards and ensures downstream components rated for 36 V or higher remain within safe operating limits during transient events.
Is SMAJ22AH suitable for bidirectional transient protection?
No, SMAJ22AH is a unidirectional TVS diode intended for protection against positive-going transients on grounded-return systems. For bidirectional protection, Taiwan Semiconductor specifies parts with CH or CAH suffixes (e.g., SMAJ22CH); SMAJ22AH must be used with correct polarity alignment - cathode to the protected line, anode to ground.
Does SMAJ22AH meet automotive qualification standards?
Yes, SMAJ22AH is AEC-Q101 qualified and tested for automotive-grade reliability, including high-temperature operating life (HTOL), temperature cycling (TCT), and electrostatic discharge (HBM/MM). It also meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for 12 V and 24 V vehicle electrical systems.
What is the leakage current specification for SMAJ22AH at its working voltage?
At its rated working stand-off voltage of 22 V and TA = 25 °C, SMAJ22AH exhibits a maximum reverse leakage current (IR) of 1 µA. This ultra-low leakage preserves system efficiency in always-on circuits such as automotive body control modules and battery-monitoring subsystems.
What package type does SMAJ22AH use, and is it compatible with standard reflow processes?
SMAJ22AH uses the DO-214AC (SMA) surface-mount package with matte tin-plated leads compliant with J-STD-002 solderability requirements. It is fully compatible with standard lead-free reflow profiles (IPC/JEDEC J-STD-020), including peak temperatures up to 260 °C, and has moisture sensitivity level (MSL) 1 - no baking required prior to assembly.
SMAJ22AH 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ22AH FAQ
1.How can I place an order for SMAJ22AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22AH 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 SMAJ22AH reliable?
The price and inventory of SMAJ22AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22AH is usually 5 days.
3.What payment methods are accepted for SMAJ22AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22AH?
SMAJ22AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22AH 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 SMAJ22AH?
For technical support, including SMAJ22AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22AH requirements.
6.How does Aetrix verify that SMAJ22AH is sourced from the original manufacturer or authorized distributors?
All SMAJ22AH 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 SMAJ22AH meets industry standards.
7.What is the process for return or replacement of SMAJ22AH?
All SMAJ22AH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22AH, 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 SMAJ22AH part is unused and in its original packaging.
Return procedure for SMAJ22AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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