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Diodes Incorporated SA30A-T
- Part No.:
- SA30A-T
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA30A-T.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO15
- Quantity:
- Payment:
- Shipping:
Inventory:8,263
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Product details
Overview
SA30A-T from Diodes Incorporated is a unidirectional 500W transient voltage suppressor (TVS) diode in DO-15 package, designed for primary overvoltage protection of DC power rails and signal lines. It features a 30V reverse standoff voltage (VR), 33.3–36.8V breakdown range (VBR), 48.4V max clamping voltage (VC) at 10.3A peak pulse current (IPP), and operates from –65°C to +175°C.
For engineers reviewing the SA30A-T datasheet, SA30A-T pinout, SA30A-T application, or SA30A-T equivalent, key selection criteria include clamping performance under 10/1000µs surge, thermal derating above 25°C ambient, unidirectional polarity handling, and compatibility with lead-free reflow profiles per J-STD-020C Level 1.
Technical Context
This TVS diode uses a glass-passivated silicon junction to achieve fast response time (<1.0 ps) and stable clamping during transient events such as ESD (IEC 61000-4-2), EFT (IEC 61000-4-4), and lightning-induced surges (10/1000µs waveform). Its unidirectional configuration provides asymmetric protection-blocking reverse conduction while clamping positive transients above VR.
The device is rated for 500W non-repetitive peak pulse power (Tp = 1.0 ms), with steady-state power dissipation limited to 1.0W at TL = 75°C (9.5 mm lead length, board-mounted). Derating begins linearly above 25°C ambient, reaching ~50% peak power at 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 500 W - sustains single 10/1000µs surge without failure; defines maximum transient energy absorption capability |
| Reverse Standoff Voltage (VR) | 30 V - maximum continuous DC or RMS voltage before clamping initiates; sets operating margin for 24V systems |
| Breakdown Voltage (VBR) | 33.3–36.8 V @ 1.0 mA - guaranteed conduction onset window; ensures reliable turn-on before downstream IC damage |
| Clamping Voltage (VC) | 48.4 V @ 10.3 A - maximum voltage seen by protected circuit during full-rated surge; critical for 3.3V/5V/12V rail survivability |
| Peak Pulse Current (IPP) | 10.3 A - peak current delivered at VC; used with PCB trace impedance to estimate actual clamped voltage |
| Operating Temperature | –65°C to +175°C - supports automotive under-hood, industrial motor control, and outdoor power supply applications |
| Package | DO-15 - axial-leaded, through-hole mountable; enables high-current thermal path via 9.5 mm leads and board copper |
Pinout & Package
DO-15 package: axial-leaded, molded plastic case (UL 94V-0), cathode band marked on body. Leads are tin-plated, solderable per MIL-STD-202 Method 208; RoHS-compliant matte tin finish available.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-voltage return; completes clamping path during positive transients |
| Cathode | Protected line input | Connected to line being protected (e.g., 24V rail); conducts when voltage exceeds VR + dynamic margin |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Enables stable VBR over temperature and lifetime; eliminates moisture-induced parameter drift in humid environments |
| Fast response time | <1.0 ps - clamps transients before sensitive logic or analog circuits experience overstress |
| 500W peak pulse rating | Meets IEC 61000-4-5 Level 4 (4kV line-to-line, 2kV line-to-ground) with margin for system-level design |
| Unidirectional polarity | Prevents reverse leakage in DC-biased lines; avoids unintended conduction in negative-going signal paths |
| Lead-free & RoHS compliant | Matte tin plating meets EU Directive 2011/65/EU Annex III exemptions; compatible with Pb-free reflow (J-STD-020C Level 1) |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting 24V digital input channels against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed between field wiring and optocoupler input stage. Use Value: Limits transient voltage to ≤48.4V, ensuring optocoupler CTR remains within spec and preventing MCU GPIO latch-up. | Use Scenario: Safeguarding LIN bus transceiver power pins against battery reversal and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional clamping element on VCC rail upstream of transceiver LDO. Use Value: Withstands 10.3A surge at 48.4V clamping, maintaining transceiver operation during 12V system transients up to 300ms duration. |
| Telecom Power Feeds | Medical Equipment DC Power Entry |
Use Scenario: Secondary surge protection on -48V telecom rectifier outputs feeding remote radio units. IC Role / Device Role / Timing Role: Back-to-back clamping pair (with complementary SA30CA-T) on differential power pair. Use Value: Provides symmetric 48.4V clamping in both polarities when paired, meeting GR-1089-CORE Level 3 surge immunity. | Use Scenario: Input-stage overvoltage suppression on isolated 5V/12V auxiliary supplies in diagnostic imaging subsystems. IC Role / Device Role / Timing Role: First-line transient absorber before DC/DC converter input filter. Use Value: Absorbs 500W surges without degradation, preserving isolation barrier integrity and avoiding fault propagation to patient-connected 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 |
|---|---|---|---|
| P6KE30A | Same VR (30V), but lower peak power (600W vs. 500W), higher VC (49.9V), and larger DO-15 variant with different thermal profile | Higher IPP (10.0A vs. 10.3A) but tighter VBR tolerance; less suitable for high-temperature board layouts due to lower Pd derating slope | Select when legacy P6KE footprint compatibility is required and 1.5V higher clamping is acceptable |
| SMAJ30A | Surface-mount SMA package, same VR/VC/IPP specs, but lower Ppk (400W), shorter response time, and reduced thermal mass | Not suitable for high-energy 10/1000µs surges exceeding 400W; preferred for space-constrained PCBs where board-level routing limits surge coupling | Choose for automated SMT assembly and compact designs where peak surge energy is confirmed ≤400W |
Compared with P6KE30A and SMAJ30A, SA30A-T offers superior thermal robustness in through-hole mounting, tighter clamping at rated IPP, and proven reliability in high-humidity industrial environments due to its glass-passivated die and UL 94V-0 molding compound.
Availability
SA30A-T is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive BCM power conditioning, and telecom power feed applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SA30A-T 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
The SA-series TVS diodes are part of Diodes' transient suppression portfolio, engineered specifically for high-reliability DC power line and signal interface protection in automotive, industrial, and communications infrastructure equipment.
FAQ
What does the "-T" suffix indicate in SA30A-T?
The "-T" suffix denotes tape-and-reel packaging: 4,000 pieces per 13-inch reel, optimized for automated through-hole insertion equipment. This differs from the "-B" (bulk) variant and ensures consistent orientation and feeding reliability during high-volume assembly.
Is SA30A-T suitable for bidirectional signal line protection?
No - SA30A-T is unidirectional only, with cathode marking indicating polarity-sensitive placement. For bidirectional protection (e.g., RS-485, CAN), use SA30CA-T, which has symmetrical clamping in both directions and no cathode band marking.
How does SA30A-T perform under repeated surge stress?
SA30A-T is rated for non-repetitive pulses only. Repeated 10/1000µs surges must be spaced to allow full thermal recovery; per Figure 4, peak power derates to 50% at 125°C ambient, limiting safe repetition rate to ≤1 pulse/minute above 75°C board temperature.
Why is SA30A-T marked "Not Recommended for New Design" in the datasheet?
Diodes Incorporated issued this notice because newer platforms (e.g., P6KE series) offer improved VBR consistency, tighter VC distribution, and enhanced surge lifetime. SA30A-T remains fully functional and supported for legacy production, but new designs should evaluate P6KE30A or SMAJ30A for better long-term supply assurance.
SA30A-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 10.3A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-15
SA30A-T FAQ
1.How can I place an order for SA30A-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SA30A-T 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 SA30A-T reliable?
The price and inventory of SA30A-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA30A-T is usually 5 days.
3.What payment methods are accepted for SA30A-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA30A-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA30A-T?
SA30A-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA30A-T 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 SA30A-T?
For technical support, including SA30A-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA30A-T requirements.
6.How does Aetrix verify that SA30A-T is sourced from the original manufacturer or authorized distributors?
All SA30A-T 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 SA30A-T meets industry standards.
7.What is the process for return or replacement of SA30A-T?
All SA30A-T units undergo pre-shipment inspection (PSI). If there is an issue with SA30A-T, 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 SA30A-T part is unused and in its original packaging.
Return procedure for SA30A-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA30A-T Tags
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