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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

Taiwan Semiconductor Corporation SMAJ16A

Name: SMAJ16A
Brand: Taiwan Semiconductor Corporation
SKU: SMAJ16A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMAJ16A

Manufacturer:: Taiwan Semiconductor Corporation

Category:: TVS Diodes

Package:: DO-214AC, SMA

Datasheet:: SMAJ16A.pdf

Description:: TVS DIODE 16VWM 26VC DO214AC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SMAJ16A 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 16 V working stand-off voltage (V_WM), 17.8–19.7 V breakdown voltage (V_BR), 26.0 V maximum clamping voltage (V_C) at 15.4 A peak pulse current, and 400 W peak pulse power rating (10/1000 µs waveform). It is used in on-board DC/DC converters to protect downstream ICs from ESD and load dump events.

For engineers reviewing the SMAJ16A datasheet, SMAJ16A pinout, SMAJ16A application, or SMAJ16A equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, leakage current (<1 µA at 16 V), junction temperature range (–55 °C to +150 °C), and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics.

Technical Context

The SMAJ16A operates as a unidirectional avalanche diode, conducting only in reverse bias above its breakdown threshold to shunt surge energy to ground. Its glass-passivated junction ensures stable V_BR tolerance (±5% for 'A' suffix variants) and low leakage (<1 µA at V_WM = 16 V).

It delivers sub-nanosecond response (typically <1.0 ps from 0 V to V_{BR min}) and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity-enabling robust automated SMT assembly without pre-baking.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	16 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for safe DC bus operation.
V_BR @ I_T = 1 mA	17.8–19.7 V - Breakdown occurs within this range at 1 mA test current; defines precise turn-on threshold for transient suppression.
V_C @ I_PPM = 15.4 A	26.0 V - Clamped voltage during 10/1000 µs surge; must remain below protected IC's absolute max rating (e.g., 30 V logic supply).
P_PPM	400 W - Peak pulse power handling (10/1000 µs); supports high-energy transients like ISO 7637-2 Pulse 2b (inductive switch-off).
I_R @ V_WM	<1 µA - Reverse leakage at 16 V; negligible power loss and no measurable impact on standby current in battery-powered systems.
T_J Range	–55 °C to +150 °C - Full industrial/automotive junction temperature range; enables use in under-hood or high-power converter environments.

Pinout & Package

DO-214AC (SMA) surface-mount package: 2-terminal, single-die unidirectional configuration. Cathode indicated by molded band; anode is unmarked end. RoHS-compliant, halogen-free molding compound (UL 94V-0), matte tin-plated leads.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unmarked end)	Current entry point in forward bias; tied to system ground or low-side reference	Provides return path for surge current; must connect to low-impedance ground plane to minimize clamping overshoot.
Cathode (banded end)	Transient-sensing node; connected to protected line (e.g., 12 V rail)	Reverse-biased during normal operation; avalanches when line voltage exceeds V_BR, diverting fault current away from load.

Key Features

Feature	Design Value
Glass-passivated junction	Ensures stable V_BR over temperature and lifetime; eliminates parameter drift due to humidity or contamination.
Sub-1 ps response time	Clamps transients before sensitive ICs experience overvoltage stress-critical for protecting high-speed logic and microcontrollers.
ISO 7637-2 compliance	Validated for automotive Pulse 1 (battery disconnect), Pulse 2a (load dump), Pulse 2b (inductive kick), and Pulse 3a/b (capacitive coupling)-no additional validation needed for vehicle ECUs.
J-STD-020 Level 1 MSL	Zero bake requirement prior to reflow; compatible with standard SMT processes and high-volume manufacturing without yield loss.

Applications

Switching Mode Power Supply (SMPS)	On-board DC/DC Converter
Use Scenario: Input stage of AC/DC adapter subjected to lightning-induced surges and line switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed across primary-side bulk capacitor to clamp differential-mode spikes before they reach PWM controller. Use Value: Limits peak voltage to 26.0 V, preventing controller latch-up or gate oxide damage while maintaining <1 µA leakage during steady-state operation.	Use Scenario: 12 V-to-3.3 V buck converter powering automotive infotainment MCU. IC Role / Device Role / Timing Role: TVS mounted at converter input to absorb load dump pulses (ISO 7637-2 Pulse 2b) induced by alternator regulation faults. Use Value: Clamps 15.4 A surge to ≤26.0 V within <1 ps, ensuring MCU supply remains within 30 V absolute maximum rating and avoiding brownout resets.
Lighting Application	Adapters
Use Scenario: LED driver board in commercial lighting fixture exposed to ESD during handling and installation. IC Role / Device Role / Timing Role: TVS placed across constant-current output terminals to suppress contact discharge (IEC 61000-4-2 ±8 kV) before it damages LED string or driver IC. Use Value: Sub-ns response prevents ESD energy from propagating into driver IC; 400 W rating handles multiple discharges without degradation.	Use Scenario: Universal wall adapter with multi-voltage output (5 V/9 V/12 V) subject to plug-in/out transients and mains noise. IC Role / Device Role / Timing Role: TVS installed on secondary-side output rails to protect USB-PD negotiation ICs and voltage regulators from cross-coupled surges. Use Value: 16 V V_WM allows safe operation on 12 V output while clamping to 26.0 V-well below 30 V IC limits-and maintains <1 µA leakage to preserve no-load efficiency.

Switching Mode Power Supply (SMPS)

On-board DC/DC Converter

Use Scenario: Input stage of AC/DC adapter subjected to lightning-induced surges and line switching transients.

IC Role / Device Role / Timing Role: Unidirectional TVS placed across primary-side bulk capacitor to clamp differential-mode spikes before they reach PWM controller.

Use Value: Limits peak voltage to 26.0 V, preventing controller latch-up or gate oxide damage while maintaining <1 µA leakage during steady-state operation.

Use Scenario: 12 V-to-3.3 V buck converter powering automotive infotainment MCU.

IC Role / Device Role / Timing Role: TVS mounted at converter input to absorb load dump pulses (ISO 7637-2 Pulse 2b) induced by alternator regulation faults.

Use Value: Clamps 15.4 A surge to ≤26.0 V within <1 ps, ensuring MCU supply remains within 30 V absolute maximum rating and avoiding brownout resets.

Lighting Application

Adapters

Use Scenario: LED driver board in commercial lighting fixture exposed to ESD during handling and installation.

IC Role / Device Role / Timing Role: TVS placed across constant-current output terminals to suppress contact discharge (IEC 61000-4-2 ±8 kV) before it damages LED string or driver IC.

Use Value: Sub-ns response prevents ESD energy from propagating into driver IC; 400 W rating handles multiple discharges without degradation.

Use Scenario: Universal wall adapter with multi-voltage output (5 V/9 V/12 V) subject to plug-in/out transients and mains noise.

IC Role / Device Role / Timing Role: TVS installed on secondary-side output rails to protect USB-PD negotiation ICs and voltage regulators from cross-coupled surges.

Use Value: 16 V V_WM allows safe operation on 12 V output while clamping to 26.0 V-well below 30 V IC limits-and maintains <1 µA leakage to preserve no-load efficiency.

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient suppression applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ16	V_BR = 17.8–21.8 V (±10% tolerance); higher V_C = 28.8 V at 13.9 A	Less precise clamping margin; suitable where tighter V_BR control is not required	Select SMAJ16A when protected IC has narrow voltage margin (e.g., 3.3 V logic with 30 V abs max); SMAJ16 suffices for 12 V analog circuits with >35 V headroom.
SMBJ16A	Same V_WM/V_BR/V_C specs but in larger DO-214AA (SMB) package; 600 W P_PPM	Higher surge endurance; requires larger PCB footprint and different pad layout	Choose SMBJ16A for high-reliability automotive modules needing extended surge life; SMAJ16A preferred for space-constrained consumer adapters.

Compared with SMAJ16 and SMBJ16A, the SMAJ16A offers optimal balance of precision clamping (±5% V_BR), compact DO-214AC footprint, and full ISO 7637-2 compliance-making it ideal for cost-sensitive, space-limited DC/DC and adapter designs requiring repeatable protection performance.

Availability

SMAJ16A is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and lighting applications requiring stable component supply, consistent parametric performance, and full traceability across production batches.

Supply support for SMAJ16A 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 Taiwanese 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 automotive and industrial power systems, emphasizing high surge robustness, tight parameter tolerances, and process reliability for automated assembly.

FAQ

What is the clamping voltage of SMAJ16A and how is it measured?

The SMAJ16A has a maximum clamping voltage (V_C) of 26.0 V, measured at a peak pulse current (I_PPM) of 15.4 A using the standardized 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range (–55 °C to +150 °C) and represents the highest voltage the device allows across its terminals during a surge event-ensuring downstream components like microcontrollers or voltage regulators remain within their absolute maximum ratings. The SMAJ16A achieves this with sub-nanosecond response and stable avalanche characteristics.

Is SMAJ16A unidirectional or bidirectional, and how can I identify polarity?

The SMAJ16A is a unidirectional TVS diode, meaning it conducts only in reverse bias above its breakdown voltage and behaves as an open circuit in forward bias. Polarity is identified by a cathode band marked on the DO-214AC (SMA) package body-the banded end is the cathode and must be connected to the line being protected (e.g., 12 V rail), while the unmarked end (anode) connects to ground. Bidirectional variants use a "C" or "CA" suffix (e.g., SMAJ16CA), which SMAJ16A does not have.

Does SMAJ16A meet automotive transient standards such as ISO 7637-2?

Yes, the SMAJ16A is explicitly rated to meet ISO 7637-2 for automotive applications, covering Pulse 1 (inductive load disconnect), Pulse 2a (battery feed interruption), Pulse 2b (inductive switch-off), and Pulses 3a/3b (capacitive coupling). Its 400 W peak pulse power rating (10/1000 µs), 26.0 V clamping voltage, and –55 °C to +150 °C operating range make it suitable for engine control units, body control modules, and infotainment systems without additional external filtering or validation.

What is the leakage current specification for SMAJ16A at its working voltage?

The SMAJ16A exhibits a maximum reverse leakage current (I_R) of 1 µA when biased at its working stand-off voltage (V_WM) of 16 V, tested at 25 °C. This ultra-low leakage ensures minimal power loss in always-on systems such as battery-backed lighting controllers or automotive telematics modules. The value remains well below 5 µA across the full –55 °C to +125 °C ambient range, preserving system efficiency and thermal budget without compromising protection integrity.

Can SMAJ16A be used in automated SMT assembly without special handling?

Yes, the SMAJ16A is qualified for standard automated SMT assembly with no special handling required. It meets J-STD-020 Moisture Sensitivity Level 1 (MSL 1), meaning it can be stored indefinitely at ≤30 °C/60% RH and placed directly into reflow without baking. Its matte tin-plated leads comply with J-STD-002 for solderability, and the glass-passivated die ensures robustness against thermal shock during lead-free reflow profiles-making SMAJ16A fully compatible with high-volume manufacturing of power adapters, DC/DC modules, and lighting drivers.

SMAJ16A 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):: 16V

Voltage - Breakdown (Min):: 17.8V

Voltage - Clamping (Max) @ Ipp:: 26V

Current - Peak Pulse (10/1000µs):: 15.4A

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)

SMAJ16A FAQ

1.How can I place an order for SMAJ16A through Aetrix?

Please submit a Request for Quotation (RFQ) for SMAJ16A 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 SMAJ16A reliable?

The price and inventory of SMAJ16A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ16A is usually 5 days.

3.What payment methods are accepted for SMAJ16A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ16A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMAJ16A?

SMAJ16A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMAJ16A 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 SMAJ16A?

For technical support, including SMAJ16A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ16A requirements.

6.How does Aetrix verify that SMAJ16A is sourced from the original manufacturer or authorized distributors?

All SMAJ16A 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 SMAJ16A meets industry standards.

7.What is the process for return or replacement of SMAJ16A?

All SMAJ16A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ16A, 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 SMAJ16A part is unused and in its original packaging.

Return procedure for SMAJ16A:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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