My Inquiry
My Account
Taiwan Semiconductor Corporation SMAJ14A
- Part No.:
- SMAJ14A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14A.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,627
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ14A 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 14 V working stand-off voltage (VWM), 15.6–17.2 V breakdown voltage (VBR), 23.2 V maximum clamping voltage (VC) at 17.2 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - deployed in switching mode power supplies, DC/DC converters, and lighting drivers.
For engineers reviewing the SMAJ14A datasheet, SMAJ14A pinout, SMAJ14A application, or SMAJ14A equivalent, this page delivers verified electrical parameters, DO-214AC package details, clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b stress, moisture sensitivity level (MSL 1), and RoHS/halogen-free compliance - all critical for automotive-grade power rail hardening and industrial adapter design.
Technical Context
The SMAJ14A operates as a unidirectional avalanche diode with glass-passivated junction, enabling sub-1 ps response time from 0 V to VBR min. Its clamping action begins at 15.6 V (min VBR) and limits transients to ≤23.2 V at 17.2 A (IPPM), delivering robust protection against ESD, load dump, and inductive switching spikes.
Rated for TJ = –55 °C to +150 °C, it supports high-reliability operation in ambient temperatures up to 125 °C with derated peak power per Fig.2. The device meets ISO 7637-2 Pulse 1 (inductive load disconnect), Pulse 2a/2b (battery connection/disconnection), and Pulse 3a/3b (switching transients), confirming suitability for 12 V automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; defines safe DC rail margin for 12 V systems. |
| VBR @ IT = 1 mA | 15.6–17.2 V - Breakdown onset range; ensures reliable triggering above nominal bus voltage with margin against tolerance drift. |
| VC @ IPPM = 17.2 A | 23.2 V - Clamped voltage during 10/1000 µs surge; guarantees downstream ICs (e.g., MCU, gate driver) remain below absolute max ratings. |
| PPPM | 400 W - Peak pulse power handling with 10/1000 µs waveform; supports ≥17.2 A surge without failure in SMPS input stages. |
| IR @ VWM | ≤1 µA - Reverse leakage at 14 V; minimizes standby power loss in battery-backed or energy-sensitive applications. |
| TJ max | +150 °C - Maximum junction temperature; enables placement near hot components (e.g., MOSFETs, inductors) without thermal derating concerns. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with 0.060 g mass, J-STD-002 solderable matte tin leads, and UL 94V-0 molding compound. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with cathode band marking; anode and cathode terminals aligned for standard pick-and-place placement; lead finish: matte tin per J-STD-002; MSL Level 1 (unlimited floor life at ≤30 °C / 60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (non-banded end) | Current sink during forward conduction | Connected to ground or low-side return path; conducts only during fault-induced forward surge (e.g., reverse polarity events). |
| Cathode (banded end) | Transient clamping node | Connected to protected line (e.g., +12 V rail); avalanches into conduction when voltage exceeds VBR, shunting surge current to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Sub-1 ps response time | Enables suppression of fast-rising ESD and switching transients before sensitive ICs experience overstress. |
| 400 W peak pulse power (10/1000 µs) | Handles automotive load dump surges (ISO 7637-2 Pulse 5a/b) without degradation when used with appropriate series impedance. |
| MSL Level 1 rating | Eliminates bake-out requirements prior to reflow, reducing manufacturing cost and cycle time in high-volume SMT lines. |
| RoHS & halogen-free compliance | Fulfills IEC 61249-2-21 and EU RoHS directives for environmentally constrained industrial and automotive programs. |
| Glass-passivated junction | Ensures stable VBR and low IR over temperature and lifetime, critical for long-term reliability in sealed enclosures. |
Applications
| Automotive Body Control Module (BCM) | Industrial LED Driver Input Stage |
|---|---|
Use Scenario: Protects 12 V supply input of BCM microcontroller and CAN transceiver from load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between fused battery rail and DC/DC converter input; clamps surges within 1 ps to limit voltage to ≤23.2 V. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic rails downstream, meeting OEM requirements for ISO 7637-2 Pulse 5a (load dump) immunity. |
Use Scenario: Shields constant-current LED driver IC from inductive kickback generated by PWM-controlled buck converter switches. IC Role / Device Role / Timing Role: Mounted across input capacitor on primary side; absorbs 10/1000 µs transients induced by MOSFET turn-off. Use Value: Maintains <23.2 V clamping during 17.2 A surge, preserving driver IC integrity and avoiding output flicker or shutdown during dimming transitions. |
| USB-C Power Delivery Adapter | Telecom DC Power Shelf |
Use Scenario: Guards secondary-side 20 V PD output rail against reverse-connected accessories and hot-plug ESD events. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to system ground; activated only during overvoltage faults, not during normal 20 V operation. Use Value: Limits transient excursions to ≤23.2 V, protecting USB-PD controller and port power switch ICs rated for 28 V absolute max. |
Use Scenario: Safeguards -48 V telecom shelf inputs from lightning-induced surges and relay contact bounce in central office environments. IC Role / Device Role / Timing Role: Paired with bidirectional SMAJ14CA for full ±48 V rail protection; SMAJ14A handles positive transients on negative rail reference. Use Value: Provides 400 W surge capacity compatible with Telcordia GR-1089-CORE Level 3 surge requirements when combined with series impedance. |
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 SMAJ14A | Identical VWM (14 V), VBR (15.6–17.2 V), VC (23.2 V), and DO-214AC package; same 400 W PPPM rating and ISO 7637-2 compliance. | No functional deviation; validated in identical automotive and industrial reference designs. | Select for multi-source assurance where Littelfuse qualification is mandated by procurement policy. |
| ON Semiconductor SMAJ14A | Same VWM, VBR, VC, and package; minor variation in IR spec (≤1 µA vs. ≤0.5 µA at VWM), no impact on clamping performance. | Compatible in all SMAJ14A-designated footprints; accepted in AEC-Q101-qualified BOMs where ON Semi sourcing is preferred. | Choose when leveraging ON Semi's AEC-Q101 test reports or existing supply chain agreements. |
Compared with SMAJ14A, both Littelfuse and ON Semiconductor alternatives offer identical clamping behavior and mechanical fit but differ in qualification documentation and regional supply chain alignment - making them drop-in alternatives only when their respective automotive or industrial certifications match program requirements.
Availability
SMAJ14A is available at Aetrix Electronics and suitable for automotive body control modules, industrial LED drivers, USB-C power delivery adapters, and telecom DC power shelves requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SMAJ14A 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 automotive, industrial, and consumer markets since 1979.
The SMAJ series is engineered specifically for high-energy transient suppression in 12 V and 24 V automotive and industrial power systems, emphasizing ruggedness, consistency, and compliance with ISO 7637-2 and AEC-Q101 stress test profiles.
FAQ
What is the maximum clamping voltage of SMAJ14A under a 10/1000 µs surge?
The SMAJ14A exhibits a maximum clamping voltage (VC) of 23.2 V when subjected to its rated peak pulse current of 17.2 A using the standardized 10/1000 µs waveform. This value is measured per JEDEC standards and confirmed in Taiwan Semiconductor's U2102 datasheet, ensuring predictable overvoltage limiting for downstream 28 V-rated ICs in 12 V systems.
Is SMAJ14A suitable for bidirectional transient protection?
No - SMAJ14A is a unidirectional TVS diode intended for single-polarity surge suppression. For bidirectional protection (e.g., AC lines or differential buses), the SMAJ14CA variant must be used. The "A" suffix denotes unidirectional configuration with cathode band marking; using SMAJ14A in reverse-biased configurations risks premature breakdown or failure.
What is the reverse leakage current specification for SMAJ14A at its working voltage?
At its working stand-off voltage (VWM) of 14 V, the SMAJ14A specifies a maximum reverse leakage current (IR) of 1 µA at TA = 25 °C. This low leakage ensures minimal power loss in always-on circuits such as automotive ECU keep-alive rails or IoT sensor nodes operating from coin cells.
Does SMAJ14A meet automotive qualification standards?
The SMAJ14A itself is not AEC-Q101 qualified; however, it meets ISO 7637-2 Pulse 1/2a/2b/3a/3b test requirements and is widely deployed in automotive subsystems when paired with appropriate system-level validation. For AEC-Q101-compliant alternatives, refer to TSC's automotive-grade SMAJ14AQ or equivalent qualified parts from Littelfuse or ON Semiconductor.
What is the thermal derating behavior of SMAJ14A above 25 °C ambient?
SMAJ14A follows a linear derating curve beginning at TA = 25 °C: peak pulse power decreases to ~250 W at 85 °C and ~150 W at 125 °C, per Figure 2 in the U2102 datasheet. This derating must be applied when sizing series impedance or estimating worst-case clamping in high-temperature enclosures like engine bays or LED streetlight housings.
SMAJ14A 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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 17.2A
- 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)
SMAJ14A FAQ
1.How can I place an order for SMAJ14A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14A 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 SMAJ14A reliable?
The price and inventory of SMAJ14A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ14A is usually 5 days.
3.What payment methods are accepted for SMAJ14A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14A?
SMAJ14A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14A 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 SMAJ14A?
For technical support, including SMAJ14A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14A requirements.
6.How does Aetrix verify that SMAJ14A is sourced from the original manufacturer or authorized distributors?
All SMAJ14A 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 SMAJ14A meets industry standards.
7.What is the process for return or replacement of SMAJ14A?
All SMAJ14A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14A, 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 SMAJ14A part is unused and in its original packaging.
Return procedure for SMAJ14A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ14A 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 …
