My Inquiry
My Account
Taiwan Semiconductor Corporation SMAJ8.0
- Part No.:
- SMAJ8.0
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.0.pdf
- Description:
- 400W, 9.9V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:3,664
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ8.0 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 8.0 V working stand-off voltage (VWM), 8.89–10.90 V breakdown voltage (VBR) at 1 mA test current, 15.0 V maximum clamping voltage (VC) at 50 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - enabling robust surge immunity in compact power adapters and on-board DC/DC converters.
For engineers reviewing the SMAJ8.0 datasheet, SMAJ8.0 pinout, SMAJ8.0 application, or SMAJ8.0 equivalent, key selection considerations include its DO-214AC (SMA) package compatibility with automated placement, sub-1 ps response time, <1 µA reverse leakage above 10 V, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and unidirectional polarity marking for correct PCB orientation.
Technical Context
The SMAJ8.0 operates as a silicon avalanche diode that enters controlled breakdown when reverse voltage exceeds its VBR threshold, diverting transient energy to ground while clamping the protected line to ≤15.0 V. Its glass-passivated junction ensures stable leakage and long-term reliability under repeated surge stress.
Designed for single-pulse transients per IEC 61000-4-5 and automotive ISO 7637-2, it supports 40 A non-repetitive forward surge current (IFSM) and maintains operation across –55 °C to +150 °C junction temperature range, with steady-state power dissipation rated at 1 W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - Maximum continuous DC or RMS voltage the device blocks without conduction; sets minimum system operating margin before clamping. |
| VBR min/max | 8.89–10.90 V at IT = 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during fast transients. |
| VC @ IPPM | 15.0 V at IPPM = 50 A (10/1000 µs) - Clamped voltage seen by downstream circuitry; defines worst-case overvoltage exposure. |
| PPPM | 400 W - Peak transient power handling capability; validates suitability for 400 W surge events per standard waveform. |
| IR @ VWM | <1 µA - Ultra-low reverse leakage at rated stand-off; minimizes standby power loss and avoids false triggering. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline; compatible with JEDEC MS-013, enables high-density layout and reflow assembly. |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with matte tin-plated leads, cathode band marking for unidirectional polarity, 0.060 g typical weight, UL 94V-0 flammability rating, and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry point in forward bias; tied to protected line in unidirectional configuration | Connects to input/power rail side; must be routed with low-inductance path to ensure fast clamping response. |
| Cathode (banded end) | Current exit point in forward bias; connected to ground or return path | Ground reference terminal; requires low-impedance connection to chassis or system ground plane to dissipate surge energy. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | Typically <1.0 ps from 0 V to VBR min - enables suppression of nanosecond-scale ESD and lightning-induced spikes before IC damage occurs. |
| Glass passivated junction | Stable VBR tolerance and low IR drift over temperature and lifetime - critical for consistent protection in industrial environments. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) - meets automotive electronics immunity requirements. |
| Moisture sensitivity level | MSL Level 1 (per J-STD-020) - no floor life limitation; suitable for standard SMT reflow without dry-pack or baking. |
Applications
| Switching Mode Power Supply (SMPS) | AC/DC Adapter Input Stage |
|---|---|
Use Scenario: Protection of primary-side rectifier output against line surges and inductive kickback from transformer leakage. IC Role / Device Role / Timing Role: Unidirectional TVS placed between rectified DC bus and ground to clamp transients exceeding 8.0 V. Use Value: Limits voltage excursion to ≤15.0 V during 400 W 10/1000 µs surges, preventing MOSFET gate oxide rupture and bulk capacitor overvoltage failure. |
Use Scenario: Input-stage surge suppression in wall-mounted AC/DC adapters subjected to mains-borne transients per IEC 61000-4-5. IC Role / Device Role / Timing Role: Standoff-rated TVS mounted across bridge rectifier output to absorb differential-mode surges. Use Value: Withstands 50 A peak impulse current while clamping to 15.0 V, preserving downstream controller ICs and feedback optocouplers. |
| On-Board DC/DC Converter | Lighting Driver Circuit |
Use Scenario: Input rail protection for isolated or non-isolated buck/boost converters in industrial PLC modules. IC Role / Device Role / Timing Role: Primary-side TVS on VIN pin to prevent overvoltage propagation into switching controller and gate driver. Use Value: Sub-1 ps response ensures clamping initiates before 100 ns edge rates of fast-switching MOSFETs induce destructive ringing. |
Use Scenario: Transient suppression on constant-current LED driver inputs exposed to hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input terminals to shunt ESD and load-dump energy away from current-sense amplifier. Use Value: 1 µA max IR at 8.0 V prevents measurable error in precision current regulation, maintaining luminous output stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.0A | Narrower VBR range (8.89–9.83 V vs. 8.89–10.90 V); lower clamping voltage (13.6 V vs. 15.0 V) at same 50 A IPPM | Better suited for systems requiring tighter clamping margin near 8 V rails, e.g., 5 V logic-supplied microcontrollers with 13.6 V absolute max rating | Select SMAJ8.0A when clamping voltage headroom is constrained; verify VBR min still exceeds system VWM with tolerance stack-up. |
| SMBJ8.0 | Same VWM/VBR specs but in DO-214AA (SMB) package; 600 W PPPM rating (vs. 400 W); higher IPPM (72.2 A) | Preferred where higher surge robustness is required without changing circuit topology - e.g., automotive body control modules exposed to severe load dump | Choose SMBJ8.0 only if board space allows larger SMB footprint and thermal design accommodates higher peak power. |
Compared with SMAJ8.0A, the SMAJ8.0 offers wider VBR tolerance for relaxed manufacturing screening but higher VC; versus SMBJ8.0, it trades surge capacity for smaller DO-214AC footprint and lower cost in space-constrained consumer power supplies.
Availability
SMAJ8.0 is available at Aetrix Electronics and suitable for switching mode power supplies, AC/DC adapters, and on-board DC/DC converters requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ8.0 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 components.
The SMAJ series is part of TSC's transient suppression portfolio engineered specifically for high-reliability, surface-mount surge protection in automotive, industrial, and consumer power systems - emphasizing fast response, low leakage, and AEC-Q200-aligned robustness.
FAQ
What is the maximum clamping voltage of the SMAJ8.0 under standard surge conditions?
The SMAJ8.0 exhibits a maximum clamping voltage (VC) of 15.0 V when subjected to a 50 A peak pulse current with a 10/1000 µs waveform. This value is measured per industry-standard test conditions and represents the highest voltage imposed on the protected line during a defined transient event. The SMAJ8.0 maintains this clamping performance consistently across its specified operating temperature range.
Is the SMAJ8.0 suitable for bidirectional transient protection?
No, the SMAJ8.0 is a unidirectional TVS diode intended for DC rail protection where polarity is fixed. For bidirectional applications - such as AC lines or data buses subject to voltage reversals - the SMAJ8.0A variant is not applicable either; instead, bipolar devices like SMAJ8.0CA (with 'CA' suffix) must be used. The SMAJ8.0's cathode band marking confirms its unidirectional conduction path.
What is the reverse leakage current specification for the SMAJ8.0 at its working voltage?
The SMAJ8.0 specifies a maximum reverse leakage current (IR) of less than 1 µA when biased at its 8.0 V working stand-off voltage (VWM) and tested at 25 °C. This ultra-low leakage ensures minimal power loss in always-on systems and avoids interference with sensitive analog monitoring circuits downstream of the protection device.
Does the SMAJ8.0 comply with automotive surge immunity standards?
Yes, the SMAJ8.0 meets ISO 7637-2 requirements for Pulses 1, 2a, 2b, 3a, and 3b - covering common automotive transient threats including load dump, switch-off inductive spikes, and capacitive coupling noise. Its DO-214AC package, MSL Level 1 rating, and –55 °C to +150 °C operating range further support deployment in automotive power modules and body electronics.
What packaging and reel quantity is offered for the SMAJ8.0?
The SMAJ8.0 is supplied in DO-214AC (SMA) package format on tape-and-reel, with 7,500 units per reel. This packaging supports high-speed automated pick-and-place assembly and conforms to EIA-481 standards. The matte tin-plated leads are solderable per J-STD-002, and the green molding compound complies with RoHS and halogen-free requirements per IEC 61249-2-21.
SMAJ8.0 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):
- 8V
- Voltage - Breakdown (Min):
- 8.89V
- Voltage - Clamping (Max) @ Ipp:
- 15V
- Current - Peak Pulse (10/1000µs):
- 26.7A
- 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)
SMAJ8.0 FAQ
1.How can I place an order for SMAJ8.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.0 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 SMAJ8.0 reliable?
The price and inventory of SMAJ8.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ8.0 is usually 5 days.
3.What payment methods are accepted for SMAJ8.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.0?
SMAJ8.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.0 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 SMAJ8.0?
For technical support, including SMAJ8.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.0 requirements.
6.How does Aetrix verify that SMAJ8.0 is sourced from the original manufacturer or authorized distributors?
All SMAJ8.0 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 SMAJ8.0 meets industry standards.
7.What is the process for return or replacement of SMAJ8.0?
All SMAJ8.0 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.0, 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 SMAJ8.0 part is unused and in its original packaging.
Return procedure for SMAJ8.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ8.0 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 …
