My Inquiry
My Account
Taiwan Semiconductor Corporation SMAJ10A
- Part No.:
- SMAJ10A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ10A.pdf
- Description:
- TVS DIODE 10VWM 17VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,944
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ10A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping fast transients in DC power lines. It features a 10 V working stand-off voltage (VWM), 11.1–12.3 V breakdown voltage (VBR) at 1 mA test current, and clamps to ≤17.0 V at 23.5 A peak pulse current under 10/1000 µs waveform-ideal for protecting 12 V automotive and industrial power rails.
For engineers reviewing the SMAJ10A datasheet, SMAJ10A pinout, SMAJ10A application, or SMAJ10A equivalent, key selection criteria include its 400 W peak pulse power rating (10/1000 µs), low 5 µA maximum reverse leakage at VWM, glass-passivated junction for reliability, ISO 7637-2 compliance, and RoHS/halogen-free construction suitable for automated SMT assembly.
Technical Context
The SMAJ10A operates as a unidirectional avalanche diode with a single-die configuration optimized for fast transient suppression on positive-rail power lines. Its junction is glass passivated to ensure stable breakdown characteristics and long-term reliability under repeated surge stress.
It delivers sub-nanosecond response (<1.0 ps from 0 V to VBR min), clamps transients within defined limits per IEC 61000-4-5 and ISO 7637-2 Pulse 1/2a/2b/3a/3b, and maintains thermal stability across –55 °C to +150 °C operating junction temperature range with 1 W steady-state power dissipation capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 10 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR min/max | 11.1 V / 12.3 V @ 1 mA - Ensures predictable turn-on threshold across manufacturing lot |
| VC @ IPPM | ≤17.0 V @ 23.5 A - Limits downstream voltage stress during 10/1000 µs surge events |
| PPPM | 400 W (10/1000 µs) - Withstands automotive load dump and inductive switching surges |
| IR @ VWM | ≤5 µA - Negligible standby power loss in always-on 12 V systems |
| Package | DO-214AC (SMA) - Industry-standard SMT footprint compatible with JEDEC MS-013 |
| Polarity | Cathode band marked - Enables correct orientation during automated placement and visual inspection |
Pinout & Package
DO-214AC (SMA) package: surface-mount, molded plastic case with matte tin-plated leads, UL 94V-0 rated compound, polarity indicated by cathode band. Weight ≈ 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Connected to protected circuit ground or low-side return path | Completes clamping path when transient exceeds VBR; must be routed with low-inductance trace |
| Cathode | Connected to protected line (e.g., 12 V rail) | Marked band identifies this terminal; reverse-biased during normal operation, avalanches during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term surge endurance without parameter drift |
| Fast response time <1.0 ps | Clamps ESD and fast transients before sensitive ICs experience overstress |
| ISO 7637-2 compliance | Validated for automotive power line immunity (Pulse 1, 2a, 2b, 3a, 3b) without external filtering |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; supports standard J-STD-020 handling and storage |
| RoHS & halogen-free | Meets IEC 61249-2-21 and global environmental compliance mandates for industrial and automotive use |
Applications
| Automotive Power Rail Protection | Industrial SMPS Input Stage |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and system input filter. Use Value: Clamps 17.0 V max at 23.5 A, limiting stress on downstream DC/DC converters and microcontrollers. | Use Scenario: Safeguarding AC/DC adapter primary-side rectifier output or secondary-side 12 V bus. IC Role / Device Role / Timing Role: Standoff-clamp protection element absorbing inductive kickback from transformer leakage. Use Value: 400 W peak pulse rating handles repetitive switching surges without degradation. |
| LED Driver Power Input | On-Board DC/DC Converter Input |
Use Scenario: Shielding constant-current LED drivers from supply-line transients in streetlight or signage systems. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12–24 V input, upstream of buck controller IC. Use Value: Low 5 µA leakage preserves efficiency in always-on lighting applications. | Use Scenario: Securing point-of-load DC/DC converter inputs in telecom or networking equipment. IC Role / Device Role / Timing Role: Fast-acting transient shunt on 3.3 V, 5 V, or 12 V distribution rails. Use Value: Sub-ns response ensures clamping occurs before internal FET gate oxide breakdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ10A | Same VWM/VBR/VC specs but in larger DO-214AA (SMB) package; 600 W PPPM rating | Higher surge margin required in high-energy environments (e.g., heavy-duty vehicle systems) | Select SMBJ10A only if board space allows larger footprint and higher energy handling is mandatory |
| P6SMB10A | Identical electrical specs and DO-214AA package; manufactured by Vishay; same 400 W rating | No functional difference; used where dual-sourcing or alternate logistics are required | P6SMB10A is a second-source option with identical performance but different marking and packaging |
Compared with SMAJ10A, SMBJ10A offers 50% higher peak pulse power in a larger package, while P6SMB10A provides identical electrical behavior with alternate supply chain validation-neither is pin-compatible due to DO-214AC vs. DO-214AA footprint mismatch.
Availability
SMAJ10A is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, LED lighting systems, and on-board DC/DC converters requiring stable component supply across extended production lifecycles.
Supply support for SMAJ10A 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 developed specifically for surface-mount transient suppression in space-constrained 12 V and 24 V systems, balancing high surge capability, low leakage, and automated assembly compatibility.
FAQ
What is the maximum clamping voltage of SMAJ10A under standard surge conditions?
The SMAJ10A has a maximum clamping voltage (VC) of 17.0 V when subjected to its rated peak pulse current of 23.5 A under the industry-standard 10/1000 µs waveform. This value is guaranteed across temperature and manufacturing lot, ensuring consistent overvoltage protection for downstream 12 V logic and power circuits.
Is SMAJ10A suitable for bidirectional transient suppression?
No, SMAJ10A is a unidirectional TVS diode intended for positive-rail clamping only. For bidirectional protection, the SMAJ10CA variant (with "CA" suffix) must be used. The "A" suffix in SMAJ10A denotes tighter VBR tolerance (±5%), not bidirectional capability.
What is the meaning of the "A" suffix in SMAJ10A?
The "A" suffix in SMAJ10A indicates a tighter breakdown voltage tolerance: 11.1–12.3 V (±5% around nominal 11.7 V), compared to SMAJ10's wider 11.1–13.6 V (±10%) range. It does not denote package, polarity, or compliance differences-both share DO-214AC, unidirectional, and RoHS/halogen-free attributes.
Does SMAJ10A meet automotive qualification standards?
Yes, SMAJ10A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for transient immunity on 12 V power networks. While not AEC-Q200 qualified as a standalone component, its electrical performance and construction (glass passivation, MSL1, -55 °C to +150 °C TJ) align with automotive-grade design practices.
What is the recommended PCB pad layout for SMAJ10A?
Taiwan Semiconductor specifies a JEDEC MS-013 compliant pad layout for DO-214AC (SMA), with 2.5 mm pad length, 1.5 mm pad width, and 2.5 mm center-to-center spacing. Thermal relief and symmetric copper pours are advised to ensure uniform reflow and mechanical reliability-full dimensions are provided in TSC's Package Outline Drawing U2102.
SMAJ10A 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):
- 10V
- Voltage - Breakdown (Min):
- 11.1V
- Voltage - Clamping (Max) @ Ipp:
- 17V
- Current - Peak Pulse (10/1000µs):
- 23.5A
- 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)
SMAJ10A FAQ
1.How can I place an order for SMAJ10A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ10A 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 SMAJ10A reliable?
The price and inventory of SMAJ10A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ10A is usually 5 days.
3.What payment methods are accepted for SMAJ10A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ10A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ10A?
SMAJ10A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ10A 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 SMAJ10A?
For technical support, including SMAJ10A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ10A requirements.
6.How does Aetrix verify that SMAJ10A is sourced from the original manufacturer or authorized distributors?
All SMAJ10A 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 SMAJ10A meets industry standards.
7.What is the process for return or replacement of SMAJ10A?
All SMAJ10A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ10A, 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 SMAJ10A part is unused and in its original packaging.
Return procedure for SMAJ10A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ10A 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
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
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 …
