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Taiwan Semiconductor Corporation SMAJ24A
- Part No.:
- SMAJ24A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24A.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,962
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Product details
Overview
SMAJ24A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping fast transients on DC power lines and signal paths. It features a 24 V working stand-off voltage (VWM), 26.7–29.5 V breakdown voltage (VBR @ 1 mA), 38.9 V maximum clamping voltage (VC) at 10.3 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for automotive load-dump and ISO 7637-2 Pulse 1/2a/2b/3a/3b protection.
For engineers reviewing the SMAJ24A datasheet, SMAJ24A pinout, SMAJ24A application, or SMAJ24A equivalent, key selection criteria include clamping performance under 10/1000 µs surge, low leakage (<1 µA @ 24 V), glass-passivated junction reliability, and compliance with J-STD-020 Level 1 moisture sensitivity for high-yield SMT assembly.
Technical Context
The SMAJ24A operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its specified VBR range (26.7–29.5 V), then clamping to ≤38.9 V at 10.3 A. Its glass-passivated junction ensures stable breakdown characteristics and low leakage across -55°C to +150°C operating junction temperature.
It delivers 400 W peak pulse power per 10/1000 µs waveform (derated above 25°C ambient), meets ISO 7637-2 immunity requirements for automotive electronics, and exhibits <1.0 ps response time from 0 V to VBR(min), enabling effective suppression of ESD and switching-induced transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC bias margin. |
| VBR @ IT = 1 mA | 26.7–29.5 V - Measured breakdown threshold; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM = 10.3 A | 38.9 V - Clamped voltage under 10/1000 µs surge; determines protected circuit's maximum stress level. |
| PPPM | 400 W - Peak pulse power handling capability; supports robust protection against automotive load dump. |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off voltage; minimizes standby power loss and signal distortion. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with cathode band marking; compatible with automated placement and reflow. |
| TJ(max) | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band; weight ≈ 0.060 g; UL 94V-0 rated compound; JESD 201 Class 2 whisker compliant.
| 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 (marked end) | Reverse-biased clamping terminal | Connected to protected line (e.g., 24 V rail); conducts avalanche current during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps from 0 V to VBR(min) - Enables suppression of nanosecond-scale ESD and ringing transients before IC damage occurs. |
| Glass-passivated junction | Stable VBR tolerance and low IR drift over temperature and lifetime - improves long-term reliability in harsh environments. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) - meets automotive OEM requirements. |
| Moisture sensitivity level | Level 1 per J-STD-020 - No baking required prior to reflow; supports standard SMT process flow without yield risk. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24 V CAN bus power rails and sensor supply lines from load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between 24 V input and chassis ground to limit transient voltage to safe levels. Use Value: Limits clamped voltage to 38.9 V during 10/1000 µs 10.3 A surge, preventing damage to downstream CAN transceivers and microcontrollers rated for 40 V absolute max. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers exposed to relay coil flyback and field wiring transients. IC Role / Device Role / Timing Role: Standoff protection device mounted at connector entry point to shunt induced surges before reaching optocoupler inputs. Use Value: With <1 µA leakage at 24 V, it avoids false triggering of high-impedance input circuits while clamping to 38.9 V under 400 W surge conditions. |
| Telecom Power Supply Input | LED Driver Overvoltage Protection |
Use Scenario: Secondary-side DC input protection in 24 V telecom rectifier modules subjected to lightning-induced surges on distribution lines. IC Role / Device Role / Timing Role: Primary transient suppressor on 24 V output bus, coordinated with upstream MOVs and filters. Use Value: 400 W peak power rating and 150 °C TJ(max) support sustained operation in enclosed, high-temperature telecom cabinets. |
Use Scenario: Output rail protection in constant-current LED drivers where open-circuit faults generate high-voltage spikes. IC Role / Device Role / Timing Role: Parallel-connected clamping device across LED string terminals to absorb inductive kickback from driver FET switching. Use Value: 38.9 V clamping voltage ensures LED string voltage remains below 40 V, preventing dielectric breakdown in COB packages and driver ICs. |
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 SMAJ24A | Identical electrical specs (VWM = 24 V, VC = 38.9 V @ 10.3 A), same DO-214AC package, RoHS/halogen-free compliant. | No functional difference; validated for identical ISO 7637-2 pulses and automotive use cases. | Drop-in replacement with full traceability and dual-sourcing flexibility; preferred for programs requiring multi-source qualification. |
| ON Semiconductor SMAJ24A | Same VWM, VBR, and VC ratings; minor variation in IR spec (≤1 µA vs. ≤0.5 µA), otherwise electrically interchangeable. | Compatible in all standard 24 V clamping roles; slight IR difference irrelevant for most power-rail applications. | Validated alternative for cost-sensitive industrial designs; requires no layout or BOM change. |
Compared with SMAJ24A from Taiwan Semiconductor, Littelfuse and ON Semiconductor versions offer identical clamping performance and package compatibility but differ in manufacturing traceability and minor leakage tolerances - all three support drop-in use in 24 V automotive and industrial power protection without design modification.
Availability
SMAJ24A is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O protection, and telecom power supply input stages requiring stable component supply, long-lifecycle availability, and AEC-Q200-aligned reliability.
Supply support for SMAJ24A 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, with global distribution and AEC-Q qualified product lines.
The SMAJ series was developed specifically for high-reliability transient suppression in automotive and industrial 12 V/24 V systems, emphasizing fast response, stable clamping, and robust SMT manufacturability.
FAQ
What is the maximum clamping voltage of SMAJ24A under standard test conditions?
The SMAJ24A has a maximum clamping voltage (VC) of 38.9 V when subjected to a 10/1000 µs waveform with a peak pulse current (IPPM) of 10.3 A. This value is guaranteed per the manufacturer's datasheet and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream components remain within their absolute maximum ratings.
Is SMAJ24A unidirectional or bidirectional, and how is polarity identified?
SMAJ24A is a unidirectional TVS diode, intended for DC line protection where polarity is fixed. Polarity is marked by a cathode band on the DO-214AC (SMA) package body - the banded end connects to the protected line (e.g., 24 V rail), while the anode connects to ground. Bidirectional variants use "CA" suffix (e.g., SMAJ24CA), which SMAJ24A does not carry.
Does SMAJ24A meet automotive transient immunity standards?
Yes, SMAJ24A meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), as confirmed in Taiwan Semiconductor's official documentation. Its 400 W peak pulse power rating and sub-1 ps response time make it suitable for front-end protection in automotive ECUs, BCMs, and infotainment power supplies.
What is the operating temperature range for SMAJ24A?
SMAJ24A is rated for an operating junction temperature range of -55°C to +150°C, with storage temperature matching this span. This wide range supports deployment in under-hood automotive environments, industrial enclosures, and outdoor telecom equipment - provided PCB layout provides adequate thermal relief and ambient derating per Fig.2 in the datasheet is observed.
Can SMAJ24A be used in place of SMAJ24 without redesign?
No - SMAJ24A and SMAJ24 are distinct variants: SMAJ24A has tighter VBR tolerance (26.7–29.5 V) and lower clamping voltage (38.9 V) versus SMAJ24 (26.7–32.6 V, VC = 43.0 V). While both share VWM = 24 V, substituting SMAJ24A for SMAJ24 improves clamping performance but requires verification that reduced VC aligns with system margin requirements; it is not a blind drop-in.
SMAJ24A 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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 10.3A
- 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)
SMAJ24A FAQ
1.How can I place an order for SMAJ24A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24A 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 SMAJ24A reliable?
The price and inventory of SMAJ24A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ24A is usually 5 days.
3.What payment methods are accepted for SMAJ24A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24A?
SMAJ24A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24A 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 SMAJ24A?
For technical support, including SMAJ24A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24A requirements.
6.How does Aetrix verify that SMAJ24A is sourced from the original manufacturer or authorized distributors?
All SMAJ24A 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 SMAJ24A meets industry standards.
7.What is the process for return or replacement of SMAJ24A?
All SMAJ24A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24A, 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 SMAJ24A part is unused and in its original packaging.
Return procedure for SMAJ24A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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