My Inquiry
My Account
Taiwan Semiconductor Corporation SMAJ26A
- Part No.:
- SMAJ26A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26A.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,367
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ26A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 26 V working stand-off voltage (VWM), 28.9–31.9 V breakdown voltage (VBR), 42.1 V maximum clamping voltage (VC) at 9.5 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - deployed in switching mode power supplies, on-board DC/DC converters, and lighting systems.
For engineers reviewing the SMAJ26A datasheet, SMAJ26A pinout, SMAJ26A application, or SMAJ26A equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b transients, unidirectional polarity marking, DO-214AC (SMA) package compatibility with automated placement, and junction temperature range of –55 °C to +150 °C for automotive and industrial environments.
Technical Context
The SMAJ26A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified VBR range (28.9–31.9 V at 1 mA test current). Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA at 26 V), while fast response time (<1.0 ps) enables suppression of ESD and fast-rising transients before downstream ICs are damaged.
It complies with ISO 7637-2 for automotive load-dump and supply-transient immunity, supports 400 W peak pulse power (derated above 25 °C), and maintains clamping voltage ≤42.1 V at 9.5 A - critical for protecting 24 V nominal systems where rail overshoot must stay below 45 V to safeguard 3.3 V/5 V logic interfaces and gate drivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage; defines safe DC rail margin before conduction begins |
| VBR @ IT=1 mA | 28.9–31.9 V - Breakdown threshold range; ensures reliable triggering without premature conduction |
| VC @ IPPM=9.5 A | 42.1 V - Clamped voltage during 10/1000 µs surge; limits stress on protected 24 V system components |
| PPPM | 400 W - Peak pulse power handling (10/1000 µs); sufficient for ISO 7637-2 Pulse 1 (inductive switch-off) events |
| IR @ VWM | <1 µA - Reverse leakage at 26 V; negligible power loss and no measurable loading on source |
| TJ Range | –55 °C to +150 °C - Full automotive-grade junction temperature operation; validated for under-hood and engine-control applications |
Pinout & Package
DO-214AC (SMA) surface-mount package: molded epoxy case with matte tin-plated leads, polarity indicated by cathode band, moisture sensitivity level 1 (J-STD-020), UL 94V-0 rated compound, weight ≈0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to protected line (e.g., 24 V rail); conducts only during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Clamping performance | VC = 42.1 V at 9.5 A ensures protected 24 V circuits remain within safe voltage margins during transients |
| Fast response | <1.0 ps rise-time response prevents nanosecond-scale ESD spikes from reaching sensitive inputs |
| Automated assembly support | DO-214AC (SMA) footprint and matte tin plating comply with J-STD-002 solderability standards |
| Automotive compliance | Fully meets ISO 7637-2 Pulse 1/2a/2b/3a/3b requirements for 12 V/24 V vehicle electrical systems |
Applications
| Automotive Power Rail Protection | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: Protecting 24 V battery-fed control modules against load dump and alternator transients in commercial vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24 V rail and chassis ground to clamp surges up to ±100 V. Use Value: Limits peak rail voltage to ≤42.1 V during ISO 7637-2 Pulse 1 (100 V, 400 ms), preventing damage to microcontrollers and CAN transceivers. |
Use Scenario: Safeguarding input stage of isolated 24 V-to-5 V DC/DC converters in programmable logic controllers. IC Role / Device Role / Timing Role: Primary-side transient suppressor absorbing coupled noise and switching spikes from upstream SMPS. Use Value: Maintains converter startup integrity by suppressing >30 V transients before input capacitors charge, avoiding latch-up or overvoltage shutdown. |
| LED Driver Supply Protection | Industrial Adapter Output Stage |
Use Scenario: Securing constant-current LED driver inputs against induced surges in outdoor signage and street lighting. IC Role / Device Role / Timing Role: Standoff-rated TVS across driver input terminals to absorb lightning-induced ring waves and EFT bursts. Use Value: Withstands repeated 400 W pulses without degradation, ensuring >10-year field reliability in harsh ambient conditions. |
Use Scenario: Final-stage overvoltage guard on 24 V wall adapters powering factory automation sensors. IC Role / Device Role / Timing Role: Last-line defense against output short-circuit recovery spikes and hot-plug transients. Use Value: Clamps adapter output to ≤42.1 V within <1 ps, eliminating need for secondary regulation or crowbar circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26 | Higher clamping voltage (46.6 V at 8.6 A) and wider VBR range (28.9–35.3 V); same package and VWM | Less stringent clamping margin for 24 V systems; suitable where higher VC is acceptable | Select SMAJ26A when tighter clamping (≤42.1 V) is required to protect low-voltage logic; choose SMAJ26 for cost-sensitive designs with relaxed voltage headroom. |
| SMBJ26A | Same electrical specs but in larger DO-214AA (SMB) package; 600 W PPPM rating (10/1000 µs) | Higher power handling and thermal mass; used where surge repetition or sustained dissipation is expected | Choose SMBJ26A for high-reliability industrial power supplies needing extended surge endurance; retain SMAJ26A for space-constrained PCBs with single-event transient profiles. |
Compared with SMAJ26 and SMBJ26A, the SMAJ26A delivers optimal balance of compact DO-214AC footprint, precise 42.1 V clamping, and full ISO 7637-2 compliance - making it the preferred choice for automotive body electronics and dense industrial DC/DC modules where board area and voltage margin are critical.
Availability
SMAJ26A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial DC/DC converter input stages, and LED driver supply protection requiring stable component supply, consistent parametric performance, and long-term lifecycle continuity.
Supply support for SMAJ26A 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 automotive, industrial, and consumer markets.
The SMAJ series was developed specifically for high-reliability transient suppression in 12 V/24 V automotive and industrial power systems, emphasizing low clamping voltage, fast response, and AEC-Q101 alignment through process and qualification rigor.
FAQ
What is the maximum clamping voltage of the SMAJ26A under standard test conditions?
The SMAJ26A has a maximum clamping voltage (VC) of 42.1 V when subjected to a 10/1000 µs waveform with a peak impulse current (IPPM) of 9.5 A. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring compatibility with 24 V system ICs rated for ≤45 V absolute maximum.
Is the SMAJ26A suitable for bidirectional transient protection?
No, the SMAJ26A is a unidirectional TVS diode intended for protection of DC power rails with defined polarity. Its cathode band marks the terminal connected to the protected line, and it conducts only during reverse overvoltage. For bidirectional applications (e.g., AC lines or data buses), a part with "CA" suffix such as SMAJ26CA must be selected - the SMAJ26A does not provide symmetrical clamping in both directions.
What package type does the SMAJ26A use, and is it compatible with automated SMT assembly?
The SMAJ26A uses the DO-214AC (SMA) surface-mount package with matte tin-plated leads that meet J-STD-002 solderability requirements. Its standardized footprint, moisture sensitivity level 1 rating, and glass-passivated chip junction make it fully compatible with high-speed pick-and-place equipment and reflow soldering processes used in volume manufacturing.
Does the SMAJ26A meet automotive transient immunity standards?
Yes, the SMAJ26A meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling and EFT), verified per its published clamping and power derating curves. It is widely deployed in automotive body control modules, lighting ECUs, and infotainment power supplies where certified transient resilience is mandatory.
How does the SMAJ26A differ from the SMAJ26 part in terms of electrical performance?
The SMAJ26A offers tighter breakdown voltage tolerance (28.9–31.9 V vs. 28.9–35.3 V for SMAJ26) and lower clamping voltage (42.1 V vs. 46.6 V at respective IPPM), resulting in superior voltage margin for protecting sensitive 24 V system components. Both share identical VWM (26 V), package (DO-214AC), and power rating (400 W), but the "A" variant delivers more precise and aggressive clamping behavior.
SMAJ26A 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):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 9.5A
- 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)
SMAJ26A FAQ
1.How can I place an order for SMAJ26A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26A 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 SMAJ26A reliable?
The price and inventory of SMAJ26A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ26A is usually 5 days.
3.What payment methods are accepted for SMAJ26A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26A?
SMAJ26A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26A 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 SMAJ26A?
For technical support, including SMAJ26A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26A requirements.
6.How does Aetrix verify that SMAJ26A is sourced from the original manufacturer or authorized distributors?
All SMAJ26A 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 SMAJ26A meets industry standards.
7.What is the process for return or replacement of SMAJ26A?
All SMAJ26A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26A, 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 SMAJ26A part is unused and in its original packaging.
Return procedure for SMAJ26A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ26A 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
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 …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
