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Taiwan Semiconductor Corporation SMAJ60
- Part No.:
- SMAJ60
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ60.pdf
- Description:
- 400W, 74.1V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,266
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Product details
Overview
SMAJ60 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 60 V working stand-off voltage (VWM), 66.7–81.5 V breakdown voltage (VBR @ 1 mA), 107 V maximum clamping voltage (VC @ 3.7 A), and 400 W peak pulse power rating (10/1000 µs waveform) - enabling robust surge immunity in automotive and industrial power converters.
For engineers reviewing the SMAJ60 datasheet, SMAJ60 pinout, SMAJ60 application, or SMAJ60 equivalent, key selection criteria include its DO-214AC (SMA) package compatibility with automated placement, sub-1 ps response time, <1 µA reverse leakage at VWM, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and unidirectional polarity marking for correct PCB orientation.
Technical Context
The SMAJ60 operates as a single-die, unidirectional avalanche diode with glass-passivated junction, optimized for fast clamping of transient energy without latch-up. Its electrical behavior follows standardized TVS diode characteristics: low dynamic impedance during clamping, defined VBR tolerance (±5% typical), and thermal derating above 25°C per Fig.2.
It delivers 3.7 A peak impulse current (IPPM) under 10/1000 µs waveform while maintaining VC ≤ 107 V, and supports steady-state power dissipation up to 1 W. Junction temperature range is –55°C to +150°C, with moisture sensitivity level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 60 V - Maximum continuous DC or RMS voltage the device blocks without conduction; sets upper limit for protected circuit operating voltage. |
| VBR min/max | 66.7 V / 81.5 V @ 1 mA - Confirmed breakdown threshold range; ensures reliable triggering above normal operating voltage but below system damage threshold. |
| VC @ IPPM | 107 V @ 3.7 A - Clamped voltage during 10/1000 µs surge; defines worst-case voltage seen by downstream components during ESD or load dump. |
| PPPM | 400 W - Peak pulse power handling capability; enables protection against high-energy transients like ISO 7637-2 Pulse 5a (load dump). |
| IR @ VWM | <1 µA - Reverse leakage current at rated stand-off voltage; ensures negligible standby power loss and no interference with high-impedance sensing circuits. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with cathode band marking; compatible with IPC-7351B footprint and reflow profiles. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments and enclosed industrial enclosures. |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with matte tin-plated leads, polarity indicated by cathode band on one end. Weight ≈ 0.060 g. Meets UL 94V-0 flammability rating and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes clamping loop when transient exceeds VBR. |
| Cathode | High-side connection point | Connected to protected line (e.g., 60 V rail); marked by band; conducts avalanche current toward anode during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR and low leakage across temperature and lifetime; eliminates risk of junction corrosion in humid environments. |
| Sub-1 ps response time | Clamps transients before they propagate into sensitive ICs - critical for protecting CAN/LIN bus nodes and microcontroller I/O pins. |
| ISO 7637-2 compliance | Validated for automotive electrical disturbance testing including Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling). |
| Moisture sensitivity level 1 | Zero bake requirement before SMT assembly; simplifies manufacturing flow and reduces risk of popcorning during reflow. |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU Directive 2011/65/EU; supports green manufacturing and export compliance for global OEM programs. |
Applications
| Automotive Power Rail Protection | Industrial DC/DC Converter Input |
|---|---|
|
Use Scenario: Protecting 60 V battery-fed control modules (e.g., body control units, lighting drivers) against load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp transients before LDO or buck controller. Use Value: Limits voltage excursion to ≤107 V during 400 W pulses, preventing damage to 75 V-rated input capacitors and MOSFETs. |
Use Scenario: Safeguarding isolated 60 V input stage of telecom or factory automation DC/DC converters exposed to field wiring transients. IC Role / Device Role / Timing Role: Primary surge suppression at converter front-end, coordinated with common-mode chokes and X/Y capacitors. Use Value: Withstands repetitive 3.7 A impulses without degradation, ensuring long-term reliability in harsh EMI environments. |
| LED Driver Overvoltage Clamp | Adapter Output Line Protection |
|
Use Scenario: Preventing catastrophic failure of constant-current LED drivers due to output short-circuit-induced voltage spikes. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output terminals to absorb flyback energy from inductive loads. Use Value: 107 V clamping voltage ensures LED string remains within safe reverse-bias limits even during 10/1000 µs surges. |
Use Scenario: Adding secondary-level surge protection to 60 V wall adapters used in medical or test equipment where mains-borne transients may couple into DC output. IC Role / Device Role / Timing Role: Final-stage TVS on adapter output PCB, downstream of regulation but upstream of connector. Use Value: Sub-1 µA leakage avoids loading regulated output; DO-214AC footprint allows compact layout adjacent to USB-C or barrel jack connectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ60A | Narrower VBR range (66.7–73.7 V vs. 66.7–81.5 V); lower VC (96.8 V vs. 107 V); same package and PPPM. | Better suited for tighter voltage margin designs where clamping headroom must be minimized (e.g., 65 V-rated FETs). | Select SMAJ60A if system VMAX is ≤ 95 V and tighter VBR tolerance is required; otherwise SMAJ60 offers broader surge margin. |
| SMBJ60 | Same VWM/VBR/VC specs but higher PPPM (600 W), larger DO-214AA (SMB) package, and 5.0 A IPPM. | Used where higher surge endurance is needed (e.g., alternator-connected systems), but requires PCB area increase and layout revision. | Choose SMBJ60 only if 400 W is insufficient and board space allows DO-214AA footprint; SMAJ60 remains optimal for space-constrained 60 V rail protection. |
Compared with SMAJ60A and SMBJ60, the SMAJ60 balances clamping performance, package size, and cost for mainstream 60 V DC systems - offering verified 400 W surge handling in the smallest standard TVS outline without sacrificing leakage or thermal robustness.
Availability
SMAJ60 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial DC/DC converter input stages, and LED driver overvoltage clamping requiring stable component supply and full traceability.
Supply support for SMAJ60 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, specializing in TVS diodes, rectifiers, MOSFETs, and power management devices.
The SMAJ series is part of TSC's high-reliability transient suppression portfolio, engineered specifically for automotive-grade surge immunity and industrial power system robustness under ISO 7637-2 and IEC 61000-4-5 stress conditions.
FAQ
What is the maximum clamping voltage of the SMAJ60 under standard test conditions?
The SMAJ60 has a maximum clamping voltage (VC) of 107 V when subjected to its rated peak pulse current of 3.7 A using the 10/1000 µs waveform. This value is measured per industry-standard test conditions (TA = 25°C, specified IPPM), and represents the highest voltage that will appear across the SMAJ60 during a defined surge event - critical for ensuring downstream components remain within their absolute maximum ratings.
Is the SMAJ60 suitable for bidirectional transient suppression?
No, the SMAJ60 is a unidirectional TVS diode and is not rated for bidirectional operation. Its electrical specifications - including VBR, VC, and polarity marking - apply only in the forward direction (cathode to anode). For bidirectional protection, the SMAJ60A variant is not applicable; instead, use the SMAJ60CA or SMAJ60C series, which feature symmetrical breakdown in both directions and are explicitly designated for AC-line or data-line applications.
What does the "RH" marking code on the SMAJ60 indicate?
The "RH" marking code on the SMAJ60 identifies the specific voltage variant and manufacturing lot traceability per Taiwan Semiconductor's ordering nomenclature. According to the official datasheet, "RH" corresponds exclusively to the SMAJ60 (60 V VWM) unidirectional device, distinguishing it from variants like SMAJ60A ("RK") or SMAJ64 ("RL"). This marking appears adjacent to the cathode band on the DO-214AC package body and is used for visual inspection and automated optical recognition during SMT assembly.
How does the SMAJ60 meet automotive EMC requirements?
The SMAJ60 meets ISO 7637-2 Pulse 1 (inductive switch-off), Pulse 2a/2b (battery feed interruption), and Pulse 3a/3b (capacitive coupling) test profiles - all validated per its 400 W peak pulse power rating and 107 V clamping performance. Its fast response time (<1 ps), low leakage (<1 µA), and guaranteed operation from –55°C to +150°C ensure consistent behavior across automotive temperature and EMC stress conditions without derating penalties.
Can the SMAJ60 replace the SMAJ58 or SMAJ64 in an existing design?
The SMAJ60 is not a direct replacement for SMAJ58 or SMAJ64 due to differences in working stand-off voltage (VWM = 60 V vs. 58 V or 64 V) and corresponding clamping behavior. Substituting alters the voltage margin between normal operation and clamping onset; using SMAJ60 where SMAJ58 was specified risks premature conduction, while replacing SMAJ64 may leave insufficient headroom. Always verify VWM, VBR, and VC against system tolerances before interchanging any SMAJ-series TVS diode, including the SMAJ60.
SMAJ60 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):
- 60V
- Voltage - Breakdown (Min):
- 66.7V
- Voltage - Clamping (Max) @ Ipp:
- 107V
- Current - Peak Pulse (10/1000µs):
- 3.7A
- 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)
SMAJ60 FAQ
1.How can I place an order for SMAJ60 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ60 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 SMAJ60 reliable?
The price and inventory of SMAJ60 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ60 is usually 5 days.
3.What payment methods are accepted for SMAJ60?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ60 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ60?
SMAJ60 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ60 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 SMAJ60?
For technical support, including SMAJ60 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ60 requirements.
6.How does Aetrix verify that SMAJ60 is sourced from the original manufacturer or authorized distributors?
All SMAJ60 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 SMAJ60 meets industry standards.
7.What is the process for return or replacement of SMAJ60?
All SMAJ60 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ60, 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 SMAJ60 part is unused and in its original packaging.
Return procedure for SMAJ60:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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