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Taiwan Semiconductor Corporation SMAJ58CH
- Part No.:
- SMAJ58CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ58CH.pdf
- Description:
- TVS DIODE 58VWM 103VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,994
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Product details
Overview
SMAJ58CH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection in automotive and industrial power rails. It features a 58 V working stand-off voltage (VWM), 64.4–78.7 V breakdown voltage (VBR), 103 V maximum clamping voltage (VC) at 3.9 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - deployed in on-board DC/DC converters and SMPS input stages.
For engineers reviewing the SMAJ58CH datasheet, SMAJ58CH pinout, SMAJ58CH application, or SMAJ58CH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b transients, AEC-Q101 qualification status, moisture sensitivity level (MSL 1), and compatibility with automated SMT placement on high-reliability PCBs.
Technical Context
The SMAJ58CH operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve sub-1 ps response time from 0 V to VBR(min). Its clamping behavior is defined by a tightly controlled VC/IPPM relationship under standardized 10/1000 µs surge conditions, with thermal derating applied above 25 °C ambient per Fig.2.
It supports bidirectional applications only when paired with complementary devices or selected as bipolar variants (e.g., SMAJ58CAH); the 'CH' suffix explicitly denotes unidirectional configuration with cathode band marking. Junction temperature range spans –55 °C to +150 °C, enabling operation in under-hood automotive environments and industrial power supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 58 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; sets upper limit for protected circuit's nominal rail. |
| VBR @ IT = 1 mA | 64.4–78.7 V - Breakdown threshold range defining turn-on consistency; ensures reliable triggering across production lot. |
| VC @ IPPM = 3.9 A | 103 V - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 400 W - Peak pulse power handling capability; sufficient for ISO 7637-2 Pulse 1 (inductive load dump) and Pulse 2b (battery disconnect). |
| IR @ VWM | <1 µA - Ultra-low reverse leakage at rated stand-off; avoids parasitic loading in high-impedance sensing or battery-backed circuits. |
| TJ(MAX) | +150 °C - Maximum junction temperature; enables use in thermally constrained enclosures without forced cooling. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with 0.060 g mass, UL 94V-0 molding, and matte tin-plated leads compliant with J-STD-002. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with axial leadform, cathode band marking polarity, and RoHS/halogen-free construction per IEC 61249-2-21.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line (e.g., GND or return path); conducts during forward surge events. |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to higher-potential rail (e.g., 48 V bus); avalanches into low-impedance state during overvoltage to shunt energy to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control units and ADAS power domains. |
| Glass-passivated junction | Enhances long-term stability and reduces parameter drift under thermal stress and humidity exposure versus epoxy-passivated alternatives. |
| Sub-1 ps response time | Enables suppression of fast-rising ESD and lightning-induced transients before sensitive logic or analog circuitry sustains damage. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive switch-off), Pulse 2a (load dump simulation), Pulse 2b (battery disconnection), and Pulse 3a/3b (capacitive coupling) test profiles. |
| MSL Level 1 | Zero floor life limitation at ≤30 °C/60% RH - allows indefinite storage and standard reflow without baking prior to assembly. |
Applications
| Automotive Power Distribution | Industrial SMPS Input Stage |
|---|---|
Use Scenario: Protection of 48 V battery-fed ECUs against load dump transients up to 120 V during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery rail and DC/DC converter input. Use Value: Limits peak voltage to 103 V at 3.9 A, preventing latch-up or gate oxide rupture in upstream MOSFET drivers and controllers. |
Use Scenario: Surge suppression on primary-side rectified output of offline flyback converters in factory automation equipment. IC Role / Device Role / Timing Role: Standoff-rated transient suppressor absorbing line-to-ground surges induced by relay switching or motor commutation. Use Value: Maintains <1 µA leakage at 58 V, avoiding efficiency loss while delivering 400 W pulse immunity per IEC 61000-4-5 Level 4. |
| LED Driver Supply Rail | On-Board DC/DC Converter |
Use Scenario: Overvoltage safeguard for constant-current LED drivers powered from 24 V industrial buses subject to inductive kickback. IC Role / Device Role / Timing Role: Fast-response clamp parallel to input capacitor, triggered within picoseconds of transient onset. Use Value: Clamps 10/1000 µs surges to ≤103 V, preserving driver IC integrity and preventing LED string overcurrent due to rail collapse. |
Use Scenario: Input-side protection of buck converters supplying FPGA core voltages in railway signaling modules. IC Role / Device Role / Timing Role: Primary transient barrier located immediately after connector entry point on PCB. Use Value: Withstands repeated ISO 7637-2 Pulse 2b events without degradation, ensuring >10-year field reliability in vibration-prone environments. |
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 SMAJ58A | Unidirectional, same VWM (58 V), but VC = 93.6 V @ 4.3 A; slightly lower clamping voltage but reduced peak power (300 W above 78 V). | Preferred where tighter clamping margin is critical and surge energy is limited to <300 W. | Select SMAJ58A if system-level testing shows 93.6 V clamping improves downstream component margin without exceeding thermal limits. |
| ON Semiconductor SMAJ58CA | Bidirectional variant with symmetrical VBR (±64.4–78.7 V); same package and MSL rating but no cathode band - requires layout revision for AC-coupled or floating-rail use. | Required for differential signal lines or dual-polarity supplies where polarity reversal must be tolerated. | Choose SMAJ58CA only when bidirectional protection is mandated; otherwise, SMAJ58CH offers superior unidirectional clamping efficiency and layout simplicity. |
Compared with Littelfuse SMAJ58A and ON Semi SMAJ58CA, the SMAJ58CH delivers higher peak power (400 W vs. 300 W) and optimized unidirectional clamping for grounded-rail systems, making it preferred for automotive battery-line protection where load dump energy dominates design constraints.
Availability
SMAJ58CH is available at Aetrix Electronics and suitable for automotive power distribution, industrial SMPS input stages, and on-board DC/DC converters requiring stable component supply with full AEC-Q101 traceability and MSL Level 1 handling.
Supply support for SMAJ58CH 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, and rectifiers with global automotive and industrial certifications.
The SMAJ series was developed specifically for high-reliability transient suppression in harsh-environment applications, emphasizing AEC-Q101 compliance, tight parametric distribution, and robust packaging for automated SMT assembly.
FAQ
What is the polarity configuration of the SMAJ58CH?
The SMAJ58CH is a unidirectional TVS diode with clearly marked cathode band indicating the high-side connection point. When installed, the cathode connects to the protected positive rail (e.g., 58 V bus), and the anode connects to ground or return path. This configuration ensures precise clamping during reverse overvoltage events while blocking forward conduction under normal operation - a critical distinction from bidirectional variants like SMAJ58CAH.
Does the SMAJ58CH meet automotive qualification standards?
Yes, the SMAJ58CH is AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per JESD22-A114. This certification confirms its suitability for automotive powertrain, body electronics, and ADAS modules where reliability under thermal and electrical stress is mandatory - directly supporting ISO/TS 16949-compliant manufacturing processes.
What is the maximum clamping voltage of the SMAJ58CH under surge conditions?
The SMAJ58CH exhibits a maximum clamping voltage (VC) of 103 V when subjected to a 10/1000 µs waveform with peak impulse current (IPPM) of 3.9 A. This value is measured per standard test conditions (TA = 25 °C) and defines the upper voltage limit imposed on downstream circuitry during transient events - essential for validating safe operating area margins of connected regulators and microcontrollers.
How does the SMAJ58CH perform under elevated ambient temperatures?
The SMAJ58CH's peak pulse power rating is thermally derated above 25 °C ambient per the manufacturer's Fig.2 curve; at 85 °C, its 400 W rating reduces to approximately 260 W. Its junction temperature can reach +150 °C, allowing continued operation in engine bay or industrial enclosure environments - but sustained high-temperature surge duty requires thermal modeling to avoid cumulative degradation.
Is the SMAJ58CH compatible with lead-free reflow soldering processes?
Yes, the SMAJ58CH uses matte tin-plated leads compliant with J-STD-002 for solderability and is rated for standard lead-free reflow profiles (peak temperature ≤260 °C). Its DO-214AC (SMA) package meets UL 94V-0 flammability requirements and has moisture sensitivity level (MSL) 1, eliminating bake requirements and supporting direct placement into high-volume SMT lines without process modification.
SMAJ58CH 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 58V
- Voltage - Breakdown (Min):
- 64.4V
- Voltage - Clamping (Max) @ Ipp:
- 103V
- Current - Peak Pulse (10/1000µs):
- 3.9A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ58CH FAQ
1.How can I place an order for SMAJ58CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ58CH 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 SMAJ58CH reliable?
The price and inventory of SMAJ58CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ58CH is usually 5 days.
3.What payment methods are accepted for SMAJ58CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ58CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ58CH?
SMAJ58CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ58CH 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 SMAJ58CH?
For technical support, including SMAJ58CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ58CH requirements.
6.How does Aetrix verify that SMAJ58CH is sourced from the original manufacturer or authorized distributors?
All SMAJ58CH 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 SMAJ58CH meets industry standards.
7.What is the process for return or replacement of SMAJ58CH?
All SMAJ58CH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ58CH, 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 SMAJ58CH part is unused and in its original packaging.
Return procedure for SMAJ58CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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