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Taiwan Semiconductor Corporation SMAJ5.0A
- Part No.:
- SMAJ5.0A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ5.0A.pdf
- Description:
- TVS DIODE 5VWM 9.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,765
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Product details
Overview
SMAJ5.0A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary-side overvoltage protection in DC power rails. It features a 5.0V working stand-off voltage (VWM), 6.4–7.0V breakdown voltage (VBR) at 10mA, 43.5V clamping voltage (VC) at 800A peak pulse current, and 400W peak pulse power rating with 10/1000μs waveform - deployed in switching mode power supplies and onboard DC/DC converters.
For engineers reviewing the SMAJ5.0A datasheet, SMAJ5.0A pinout, SMAJ5.0A application, or SMAJ5.0A equivalent, this page delivers verified electrical parameters, DO-214AC package dimensions, ISO 7637-2 compliance status, clamping performance under surge conditions, and validated alternative parts for automotive and industrial power rail protection.
Technical Context
The SMAJ5.0A operates as a unidirectional avalanche diode with glass-passivated junction, enabling sub-1ps response to transients and <1μA reverse leakage above 10V. Its clamping action begins at VBR ≥6.4V and limits voltage to ≤43.5V under 800A 10/1000μs surge, sustaining up to 150°C junction temperature.
Designed for DO-214AC (SMA) surface-mount assembly, it meets JESD201 Class 2 whisker resistance, UL 94V-0 flammability, and moisture sensitivity level 1 per J-STD-020 - supporting automated placement in high-reliability power conversion modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 5.0 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR @ IT=10mA | 6.4–7.0 V - Voltage at which avalanche breakdown initiates; defines minimum trigger threshold |
| VC @ IPPM=800A | 43.5 V - Clamped voltage during 10/1000μs surge; determines protected circuit's maximum stress level |
| PPPM (10/1000μs) | 400 W - Peak transient energy absorption capacity; supports IEC/ISO-level surge immunity |
| IR @ VWM | <5 μA - Reverse leakage at rated stand-off voltage; ensures minimal standby power loss |
| Package | DO-214AC (SMA) - Standardized SMD outline with cathode band marking and 0.060g mass |
| TJ max | 150 °C - Maximum junction temperature; enables operation in thermally constrained enclosures |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with matte tin-plated leads, cathode indicated by a band on the body; polarity-critical for unidirectional operation; compatible with J-STD-002 soldering standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Input reference node | Connected to protected line; conducts during reverse-biased surge events |
| Cathode (banded end) | Clamp return path | Connected to ground or low-impedance return; establishes clamping reference and directionality |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | Typically <1.0 ps from 0 V to VBR min - enables suppression before downstream ICs experience overstress |
| Glass passivated junction | Stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| ISO 7637-2 compliance | Validated for Pulse 1, 2a, 2b, 3a, and 3b waveforms - suitable for 12V/24V automotive power networks |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive - supports environmentally regulated industrial designs |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Input stage protection against load dump and inductive switching spikes in AC/DC adapters and open-frame SMPS units. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across input bulk capacitor to clamp surges before rectifier and controller ICs. Use Value: Limits transient voltage to ≤43.5V at 800A, preventing damage to 65V-rated MOSFETs and PWM controllers. |
Use Scenario: Protection of point-of-load (POL) converters in telecom base stations and industrial PLCs exposed to board-level ESD and coupling noise. IC Role / Device Role / Timing Role: Standoff-clamp element on 3.3V/5V/12V secondary rails, triggered only during >6.4V excursions. Use Value: Sub-1ps response ensures clamping occurs prior to 100ns logic-level fault propagation in FPGA or microcontroller power domains. |
| Lighting Application | Automotive Body Control Module |
Use Scenario: Overvoltage suppression in LED driver circuits subjected to hot-swap transients and capacitor discharge events. IC Role / Device Role / Timing Role: Primary surge shunt on constant-current driver input, sized for 400W 10/1000μs pulses. Use Value: Withstands repeated 800A surges while maintaining <5μA leakage at 5V - preserving driver efficiency and thermal budget. |
Use Scenario: CAN/LIN bus power rail protection in BCMs where battery transients (Pulse 1/2a per ISO 7637-2) threaten MCU and driver ICs. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to chassis ground, positioned upstream of LDOs and CAN transceivers. Use Value: 43.5V clamping ensures protected 5V regulators remain within absolute maximum ratings during 100V/50ms load-dump 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 |
|---|---|---|---|
| Littelfuse SMAJ5.0A | Identical VWM (5.0V), VBR (6.4–7.0V), VC (43.5V), and DO-214AC package; same 400W rating and ISO 7637-2 compliance | No functional deviation; validated in identical automotive and industrial surge test setups | Drop-in replacement with full traceability and dual-sourcing capability |
| ON Semiconductor SMAJ5.0A | VBR range 6.4–7.3V (slightly wider), VC = 41.7V at 800A (lower clamping), same 400W rating and DO-214AC footprint | Marginally tighter clamping improves protection margin for 5V logic rails but requires validation of leakage at elevated temperature | Preferred where lower VC is critical; verify IR stability above 85°C in target environment |
Compared with Taiwan Semiconductor SMAJ5.0A, Littelfuse SMAJ5.0A offers identical parametric performance and qualification, while ON Semiconductor SMAJ5.0A provides 1.8V lower clamping voltage - beneficial for 5V rail headroom but requiring thermal leakage verification.
Availability
SMAJ5.0A is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, lighting drivers, and automotive body control modules requiring stable component supply across production lifecycles.
Supply support for SMAJ5.0A 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, serving industrial, computing, and automotive markets since 1979.
The SMAJ series is part of TSC's transient protection product line, engineered specifically for robust, high-energy surge suppression in automotive power systems and industrial power conversion equipment.
FAQ
What is the clamping voltage of SMAJ5.0A under a standard 10/1000μs surge?
The SMAJ5.0A clamps to a maximum of 43.5 V when subjected to an 800 A peak impulse current with a 10/1000 μs waveform. This value is measured per Figure 5 in the official datasheet and defines the upper voltage limit imposed on protected circuitry during transient events. The clamping performance remains stable across its operating temperature range of –55°C to +150°C. SMAJ5.0A maintains this specification without derating up to 25°C ambient.
Is SMAJ5.0A unidirectional or bidirectional, and how is polarity identified?
SMAJ5.0A is a unidirectional TVS diode, intended for DC rail protection where surge polarity is known and consistent. Polarity is marked by a cathode band on the DO-214AC (SMA) package body - the banded end connects to ground or system return, while the unmarked end connects to the protected line. Bidirectional variants use "CA" suffixes (e.g., SMAJ5.0CA); SMAJ5.0A does not conduct in forward bias beyond typical diode drop.
Does SMAJ5.0A meet automotive surge immunity standards?
Yes, SMAJ5.0A meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b waveforms - covering key automotive transients including load dump, alternator ripple, and inductive switch-off. Its 400W peak pulse power rating and 43.5V clamping voltage ensure compatibility with 12V vehicle electrical systems. Taiwan Semiconductor validates these ratings per standardized test setups defined in the ISO standard.
What is the maximum steady-state power dissipation for SMAJ5.0A?
The SMAJ5.0A has a steady-state power dissipation (PD) rating of 1 W at 25°C ambient temperature. This value applies to continuous DC or low-frequency reverse-bias conditions and must be derated linearly above 25°C per the pulse derating curve in Figure 2 of the datasheet. At 100°C ambient, PD drops to approximately 0.5 W. SMAJ5.0A is not intended for sustained forward conduction or power regulation.
How does SMAJ5.0A differ from SMAJ5.0 (non-A) variant?
The SMAJ5.0A variant has a tighter breakdown voltage range (6.4–7.0 V) compared to SMAJ5.0 (6.4–7.30 V), resulting in more consistent turn-on behavior across production lots. Both share identical VWM (5.0 V), VC (43.5 V vs. 41.7 V), and 400W rating, but SMAJ5.0A's narrower VBR improves predictability in precision clamp applications. SMAJ5.0A also uses marking code "AE", whereas SMAJ5.0 uses "AD".
SMAJ5.0A 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):
- 5V
- Voltage - Breakdown (Min):
- 6.4V
- Voltage - Clamping (Max) @ Ipp:
- 9.2V
- Current - Peak Pulse (10/1000µs):
- 43.5A
- 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)
SMAJ5.0A FAQ
1.How can I place an order for SMAJ5.0A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ5.0A 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 SMAJ5.0A reliable?
The price and inventory of SMAJ5.0A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ5.0A is usually 5 days.
3.What payment methods are accepted for SMAJ5.0A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ5.0A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ5.0A?
SMAJ5.0A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ5.0A 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 SMAJ5.0A?
For technical support, including SMAJ5.0A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ5.0A requirements.
6.How does Aetrix verify that SMAJ5.0A is sourced from the original manufacturer or authorized distributors?
All SMAJ5.0A 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 SMAJ5.0A meets industry standards.
7.What is the process for return or replacement of SMAJ5.0A?
All SMAJ5.0A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ5.0A, 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 SMAJ5.0A part is unused and in its original packaging.
Return procedure for SMAJ5.0A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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