My Inquiry
My Account
onsemi 1SMA36AT3
- Part No.:
- 1SMA36AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA36AT3.pdf
- Description:
- TVS DIODE 36VWM 58.1VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:4,237
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1SMA36AT3 from ON Semiconductor is a unidirectional 400 W peak power Zener transient voltage suppressor (TVS) designed to clamp high-energy transients in DC power lines and signal paths. It features a 36 V working peak reverse voltage (VRWM), 42.1 V nominal breakdown voltage (VBR) at 1 A test current, 58.1 V clamping voltage (VC) at 6.9 A peak pulse current, and sub-1 ns response time. It protects automotive power supplies and industrial control I/O interfaces against ESD and lightning-induced surges.
For engineers reviewing the 1SMA36AT3 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, SMA package mechanical data, real-world clamping behavior, and direct alternative options for overvoltage protection design-in.
Technical Context
The 1SMA36AT3 operates as a unidirectional avalanche diode, conducting only during reverse overvoltage events above its VBR threshold while remaining high-impedance under normal bias. Its low zener impedance and fast <1 ns response enable effective suppression of 10/1000 µs waveform transients up to 400 W peak power.
It is rated for −65 °C to +150 °C operating temperature, supports top-slide or bottom-mount PCB placement, and meets Class 3 ESD immunity (>16 kV HBM). The device uses ON Semiconductor's Surmetic SMA package (Case 403D-02) with molded cathode band polarity marking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 36 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1 A | 42.1 V (nominal) - Avalanche breakdown initiates reliably within ±2.1 V tolerance |
| VC @ IPP=6.9 A | 58.1 V - Clamped voltage seen by protected circuit during 400 W transient |
| PPK | 400 W @ 1 ms - Peak surge energy handling per non-repetitive 10/1000 µs pulse |
| Response Time | <1 ns - Enables protection of high-speed logic and microcontroller I/O pins |
| ESD Rating | Class 3 (>16 kV HBM) - Validated robustness against human-body model discharge events |
| Package | SMA (Case 403D-02) - Surface-mount plastic package with flat handling surface and low profile (max 2.41 mm height) |
Pinout & Package
SMA (Case 403D-02) is a two-terminal surface-mount plastic package with cathode indicated by a molded band. It features void-free transfer-molded construction, corrosion-resistant surfaces, and solderable leads rated for 260 °C / 10 s reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path) in unidirectional TVS configuration |
| Cathode | Avalanche conduction terminal | Marked with band; connected to protected line (e.g., 36 V rail or signal trace) to clamp positive transients |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 4 surge (4 kV, 2 Ω source) on 36 V systems without failure |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage stress on downstream ICs compared to higher-ratio suppressors |
| Molded cathode polarity band | Enables automated optical inspection (AOI) and eliminates orientation errors during SMT placement |
| Pb-free option (1SMA36AT3G) | Complies with RoHS Directive 2011/65/EU without derating or performance trade-off |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: 12 V/24 V battery-supplied ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp positive surges above 36 V. Use Value: Limits voltage to ≤58.1 V during 6.9 A transient, preventing damage to 40 V-rated DC-DC controllers and CAN transceivers. | Use Scenario: 24 V digital input modules receiving signals from field sensors in factory automation environments. IC Role / Device Role / Timing Role: Standoff protector on input channel, absorbing induced surges from relay coil switching and EMI coupling. Use Value: Withstands repeated 400 W pulses without parameter shift, ensuring long-term reliability in unattended operation. |
| Medical Equipment Power Supply Input | Telecom Line Card Surge Protection |
Use Scenario: Secondary-side 36 V output of isolated AC/DC adapter powering critical patient monitoring subsystems. IC Role / Device Role / Timing Role: Final-stage overvoltage guard before LDO regulators and analog front-ends. Use Value: Sub-1 ns response ensures clamping occurs before sensitive ADCs or op-amps experience destructive overvoltage. | Use Scenario: Protection of Ethernet PHY interface power rails (e.g., 3.3 V or 5 V bias) against lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Localized clamping element on board-level power distribution network near connector. Use Value: 58.1 V clamping voltage provides safe margin below absolute maximum ratings of 6 V tolerant PHY ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36A (Bourns) | Same VRWM (36 V), higher PPK (600 W), larger SMB package (Case 403A) | Requires PCB footprint change; better suited for higher-energy surges where space allows | Select when system-level surge testing exceeds IEC 61000-4-5 Level 4 and board area permits SMB |
| P6SMB36A (Littelfuse) | Identical VRWM (36 V) and PPK (600 W); same SMB package; tighter VBR tolerance (±5% vs ±6.7%) | Not drop-in compatible due to different package size and thermal profile | Prefer for new designs targeting tighter clamping consistency and higher surge margin, accepting SMB layout revision |
Compared with 1SMA36AT3, SMBJ36A and P6SMB36A offer higher peak power but require larger PCB footprints; the 1SMA36AT3 remains optimal for space-constrained 36 V protection where 400 W capability suffices and SMA mounting is mandated.
Availability
1SMA36AT3 is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC inputs, medical power supplies, and telecom line cards requiring stable component supply and RoHS-compliant transient suppression.
Supply support for 1SMA36AT3 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
ON Semiconductor (now part of onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud power applications.
The 1SMAxxAT3 series was developed specifically for cost-sensitive, high-reliability unidirectional transient suppression in surface-mount power and signal lines across automotive, industrial control, and medical equipment.
FAQ
What is the clamping voltage of the 1SMA36AT3 at its rated peak pulse current?
The 1SMA36AT3 has a maximum clamping voltage (VC) of 58.1 V when subjected to its rated peak pulse current (IPP) of 6.9 A under the standard 10/1000 µs waveform. This value is measured at TA = 25°C and defines the upper voltage limit imposed on the protected circuit during a full 400 W transient event. The 1SMA36AT3 maintains this clamping performance across its specified operating temperature range.
Is the 1SMA36AT3 suitable for bidirectional transient protection?
No, the 1SMA36AT3 is a unidirectional TVS diode and conducts only during reverse-biased overvoltage events. For bidirectional protection, ON Semiconductor offers separate devices such as the 1SMA36CAT3. Using the 1SMA36AT3 in a bidirectional configuration would leave the forward direction unprotected and may lead to device failure under positive-going transients exceeding its forward voltage rating.
What is the thermal resistance from junction to ambient for the 1SMA36AT3?
The 1SMA36AT3 has a thermal resistance from junction to ambient (RJA) of 250 °C/W when mounted on an FR-4 board using ON Semiconductor's minimum recommended footprint. This value assumes TA = 25°C and determines the steady-state power derating curve; for example, at 75°C ambient, the device must be derated to 0.5 W DC dissipation to avoid exceeding maximum junction temperature.
Does the 1SMA36AT3 meet RoHS requirements?
Yes, the 1SMA36AT3 is available in a Pb-free version designated as 1SMA36AT3G, which complies with the EU RoHS Directive 2011/65/EU. The "G" suffix indicates lead-free terminations and compatible packaging; both versions share identical electrical specifications and thermal performance, with no functional or reliability trade-offs introduced by the Pb-free construction.
How is polarity identified on the 1SMA36AT3 package?
The cathode of the 1SMA36AT3 is marked by a molded polarity band on the body of the SMA package (Case 403D-02). This band aligns with the cathode terminal and serves as the primary visual indicator for correct orientation during PCB assembly. The anode is the unmarked end. This marking enables reliable automated optical inspection (AOI) and prevents misplacement during high-volume SMT manufacturing.
1SMA36AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 36V
- Voltage - Breakdown (Min):
- 40V
- Voltage - Clamping (Max) @ Ipp:
- 58.1V
- Current - Peak Pulse (10/1000µs):
- 6.9A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 345pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
1SMA36AT3 FAQ
1.How can I place an order for 1SMA36AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA36AT3 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 1SMA36AT3 reliable?
The price and inventory of 1SMA36AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA36AT3 is usually 5 days.
3.What payment methods are accepted for 1SMA36AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA36AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA36AT3?
1SMA36AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA36AT3 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 1SMA36AT3?
For technical support, including 1SMA36AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA36AT3 requirements.
6.How does Aetrix verify that 1SMA36AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMA36AT3 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 1SMA36AT3 meets industry standards.
7.What is the process for return or replacement of 1SMA36AT3?
All 1SMA36AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA36AT3, 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 1SMA36AT3 part is unused and in its original packaging.
Return procedure for 1SMA36AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA36AT3 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
