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Taiwan Semiconductor Corporation SMAJ58H
- Part No.:
- SMAJ58H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ58H.pdf
- Description:
- TVS DIODE 58VWM 103VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,094
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Product details
Overview
SMAJ58H 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 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 (10/1000 µs waveform). It is widely deployed in automotive-grade DC/DC converters to suppress load dump and ISO 7637-2 pulses.
For engineers reviewing the SMAJ58H datasheet, SMAJ58H pinout, SMAJ58H application, or SMAJ58H equivalent, key selection criteria include its AEC-Q101 qualification, DO-214AC (SMA) package compatibility with automated placement, sub-1 ps response time, <1 µA leakage above 10 V, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b.
Technical Context
The SMAJ58H operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve stable, repeatable clamping behavior under fast-rising transients. Its breakdown is specified at 1 mA test current, with guaranteed VBR between 64.4 V and 78.7 V - ensuring reliable turn-on before system-level damage thresholds are exceeded.
It delivers 400 W peak pulse power handling per the standardized 10/1000 µs waveform, derated linearly above 25 °C ambient per Fig.2, and supports steady-state power dissipation up to 1 W. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for high-reliability PCB assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 58 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe DC rail margin. |
| VBR @ IT=1 mA | 64.4–78.7 V - Guaranteed avalanche onset range; ensures clamping initiates well below typical 80–100 V automotive surge limits. |
| VC @ IPPM=3.9 A | 103 V - Maximum clamped voltage during 10/1000 µs transient; determines protected circuit's peak stress level. |
| PPPM | 400 W - Peak pulse power capability (10/1000 µs); sufficient for ISO 7637-2 Pulse 1 (−150 V, 50 Ω, 2 Ω series) suppression. |
| IR @ VWM | <1 µA - Ultra-low reverse leakage at rated stand-off; avoids unnecessary power loss or bias drift in precision circuits. |
| Response Time | <1.0 ps - Sub-picosecond junction response enables effective suppression of ESD and fast-switching noise. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline; compatible with standard reflow profiles and pick-and-place equipment. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, cathode band marking polarity, 0.060 g typical weight, and UL 94V-0 rated compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward conduction terminal | Connects to lower-potential side (e.g., ground or return path) in unidirectional configuration. |
| Cathode (banded end) | Reverse-biased clamping terminal | Connects to protected line (e.g., +58 V rail); conducts only during overvoltage events to clamp to ≤103 V. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood and powertrain applications per stress test requirements (HTOL, TCT, HAST, etc.). |
| Glass passivated junction | Enhances long-term reliability and stability of VBR and leakage under thermal cycling and humidity exposure. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) immunity requirements. |
| Moisture sensitivity level 1 | Zero floor life limitation - can be stored indefinitely at ≤30 °C/60% RH without baking prior to reflow. |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained supply chains. |
Applications
| Automotive DC/DC Converters | Industrial SMPS Inputs |
|---|---|
Use Scenario: Protecting 48 V–60 V input stage of buck-derived DC/DC converters in ADAS ECUs against load dump and battery reversal transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input rail and ground to clamp surges to ≤103 V within picoseconds. Use Value: Prevents MOSFET gate oxide rupture and controller IC latch-up during ISO 7637-2 Pulse 1 (−150 V, 50 Ω source impedance). |
Use Scenario: Safeguarding primary-side rectifier outputs in telecom-grade 48 V offline SMPS subjected to lightning-induced ring waves. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing 400 W transient energy without thermal runaway or parameter shift. Use Value: Maintains system uptime by eliminating catastrophic failure modes while meeting IEC 61000-4-5 Level 3 (1 kV/2 kV) surge immunity. |
| LED Driver Power Rails | On-Board Charger (OBC) Auxiliary Supplies |
Use Scenario: Shielding constant-current LED driver ICs from switching noise and inductive kickback in streetlight and headlamp modules. IC Role / Device Role / Timing Role: Fast-response clamping diode shunting transients away from sensitive analog feedback and PWM control pins. Use Value: Eliminates false dimming/flickering and extends driver IC lifetime by limiting voltage excursions to <103 V. |
Use Scenario: Protecting 12 V auxiliary supplies in EV on-board chargers exposed to CAN bus coupling and relay bounce noise. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) TVS maintaining rail integrity during sleep mode while responding to sub-ns edge transients. Use Value: Ensures always-on monitoring circuits remain functional after repeated 100 V/1 µs transients per ISO 16750-2. |
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 | Lower VBR range (64.4–71.2 V); tighter tolerance; same DO-214AC package and 400 W rating. | Preferred where tighter clamping consistency is required across temperature and lot variation. | Select SMAJ58A when design requires reduced VBR spread and higher production yield in automotive Tier-1 BOMs. |
| ON Semiconductor SMAJ58CA | Bidirectional variant (CA suffix); symmetric ±58 V VWM; identical clamping and power specs. | Required for AC-coupled or differential signal lines where polarity reversal must be suppressed in both directions. | Choose SMAJ58CA only if bidirectional protection is mandated - SMAJ58H is not electrically interchangeable due to polarity asymmetry. |
Compared with SMAJ58A and SMAJ58CA, the SMAJ58H offers optimal cost-performance balance for unidirectional DC rail protection, with verified AEC-Q101 qualification and full ISO 7637-2 coverage - whereas SMAJ58A trades broader VBR tolerance for tighter spec compliance, and SMAJ58CA adds bidirectional capability at no clamping performance gain for single-polarity use cases.
Availability
SMAJ58H is available at Aetrix Electronics and suitable for automotive DC/DC converters, industrial SMPS inputs, and LED driver power rails requiring stable component supply, AEC-Q101 traceability, and ISO 7637-2 compliance.
Supply support for SMAJ58H 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, and rectifiers for automotive, industrial, and consumer markets.
The SMAJ series was developed specifically for AEC-Q101-compliant transient suppression in harsh automotive environments, emphasizing low leakage, fast response, and robust package reliability under thermal and mechanical stress.
FAQ
What is the maximum clamping voltage of SMAJ58H under standard test conditions?
The SMAJ58H has a maximum clamping voltage (VC) of 103 V when subjected to its rated peak pulse current of 3.9 A using the 10/1000 µs waveform. This value is measured per JEDEC standards and guarantees that protected downstream circuitry will not experience voltages exceeding 103 V during transient events - critical for safeguarding 60 V-rated MOSFETs and controllers in automotive DC/DC designs.
Is SMAJ58H qualified for automotive applications?
Yes, SMAJ58H is AEC-Q101 qualified, meaning it has passed accelerated stress testing including high-temperature operating life (HTOL), temperature cycling (TCT), and highly accelerated stress test (HAST) per automotive reliability requirements. This qualification confirms its suitability for under-hood and powertrain applications where sustained operation at −40 °C to +150 °C junction temperature is required.
What does the "H" suffix indicate in SMAJ58H?
The "H" suffix in SMAJ58H denotes the high-power variant of the SMAJ family, specifying a 400 W peak pulse power rating (10/1000 µs) and DO-214AC (SMA) package. It distinguishes this part from legacy SMAJ versions with lower power ratings or different packages, and confirms compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b test profiles.
Can SMAJ58H replace SMAJ58A in an existing design?
SMAJ58H and SMAJ58A share the same VWM (58 V) and package but differ in VBR range: SMAJ58H is 64.4–78.7 V, while SMAJ58A is 64.4–71.2 V. If the design relies on tighter VBR tolerance for precise clamping timing, SMAJ58A may be preferred; however, SMAJ58H remains functionally valid where the wider VBR window is acceptable per system margin analysis.
Does SMAJ58H meet RoHS and halogen-free requirements?
Yes, SMAJ58H is RoHS compliant per EU Directive 2011/65/EU and halogen-free per IEC 61249-2-21. The molding compound contains no brominated flame retardants (BFRs), chlorinated flame retardants (CFRs), or antimony trioxide, and all terminations use matte tin plating per J-STD-002 solderability standards - supporting green manufacturing and end-of-life recycling mandates.
SMAJ58H 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):
- 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)
SMAJ58H FAQ
1.How can I place an order for SMAJ58H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ58H 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 SMAJ58H reliable?
The price and inventory of SMAJ58H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ58H is usually 5 days.
3.What payment methods are accepted for SMAJ58H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ58H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ58H?
SMAJ58H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ58H 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 SMAJ58H?
For technical support, including SMAJ58H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ58H requirements.
6.How does Aetrix verify that SMAJ58H is sourced from the original manufacturer or authorized distributors?
All SMAJ58H 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 SMAJ58H meets industry standards.
7.What is the process for return or replacement of SMAJ58H?
All SMAJ58H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ58H, 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 SMAJ58H part is unused and in its original packaging.
Return procedure for SMAJ58H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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