My Inquiry
My Account
Taiwan Semiconductor Corporation SA33CH
- Part No.:
- SA33CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA33CH.pdf
- Description:
- 500W, 40.8V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,506
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SA33CH from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, with 33V working stand-off voltage (VWM), 36.7–44.9V breakdown voltage (VBR @ 1mA), and 58.1V maximum clamping voltage (VC) at 8.8A peak pulse current. It delivers fast response (<1.0ps), low leakage (<1μA @ 33V), and AEC-Q101 qualification for automotive-grade surge protection.
For engineers reviewing the SA33CH datasheet, SA33CH pinout, SA33CH application, or SA33CH equivalent, this page provides verified electrical parameters, mechanical packaging details, real-world use cases in automotive power electronics, and validated alternative parts for ESD and load-dump transient suppression.
Technical Context
The SA33CH operates as a unidirectional avalanche diode, designed to clamp transients above its VBR threshold while maintaining low dynamic impedance during surge events. Its 500W peak pulse power rating (10/1000μs waveform) and 175°C maximum junction temperature support robust operation in harsh environments.
It features a cathode-band polarity marking, pure tin-plated leads compliant with J-STD-002, and UL 94V-0 molding compound. The device is rated for 70A non-repetitive forward surge current (8.3ms half-sine) and exhibits a 42 mV/°C VBR temperature coefficient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 36.7 V / 44.9 V @ 1 mA - Breakdown voltage range defining reliable avalanche onset |
| VC @ IPPM | 58.1 V @ 8.8 A - Clamping voltage under full-rated 500W surge, limiting downstream stress |
| PPK | 500 W - Peak pulse power handling per 10/1000μs waveform, critical for ISO 7637-2 load-dump immunity |
| IR @ VWM | <1 μA - Ultra-low reverse leakage ensures minimal standby power loss in battery-coupled systems |
| TJ max | +175 °C - Enables placement near high-temperature power stages without derating concerns |
| Response time | <1.0 ps - Sub-picosecond turn-on guarantees protection of fast-edge digital ICs and microcontrollers |
Pinout & Package
Package: DO-204AC (DO-15), axial leaded, epoxy-molded case with cathode band marking. Meets UL 94V-0 flammability rating and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path in unidirectional clamping configuration |
| Cathode | Avalanche clamping terminal | Connected to protected line (e.g., 12V rail); cathode band identifies polarity for correct PCB orientation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics per stress test requirements |
| 500W peak pulse power | Withstands ISO 7637-2 Pulse 5a (load dump) up to 110V/350ms without failure |
| Low clamping ratio (VC/VBR ≈ 1.5) | Minimizes overvoltage overshoot during transients, protecting 3.3V/5V logic interfaces downstream |
| Sub-1ps response time | Engages before ESD or fast transients propagate into sensitive analog front-ends or CAN transceivers |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and global environmental compliance mandates for Tier-1 automotive supply chains |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12V/24V power distribution networks in engine control modules against load-dump transients (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input to clamp surges before they reach regulation circuitry. Use Value: Limits clamped voltage to ≤58.1V, preventing damage to 60V-rated MOSFETs and enabling use of cost-optimized downstream components. | Use Scenario: Shielding 4–20mA current-loop sensor inputs in PLC analog input modules from EFT bursts (IEC 61000-4-4). IC Role / Device Role / Timing Role: Bidirectional-capable variant not used; SA33CH serves as unidirectional clamp on supply side of op-amp front-end. Use Value: <1μA leakage avoids signal offset errors; fast response preserves integrity of sub-μs transient detection windows. |
| LED Driver Overvoltage Clamp | Automotive LIN Bus Line Protection |
Use Scenario: Safeguarding constant-current LED drivers in headlamp modules from alternator-induced spikes during ignition cycling. IC Role / Device Role / Timing Role: Mounted across driver input terminals to shunt energy during 100V+ transients lasting <100ms. Use Value: 500W rating sustains multiple load-dump events without degradation; DO-15 package allows manual rework in high-vibration assemblies. | Use Scenario: Protecting LIN transceiver pins (e.g., TJA1020) from coupled transients on vehicle wiring harnesses. IC Role / Device Role / Timing Role: Placed between LIN bus line and transceiver VIO pin to clamp ESD and burst noise below 40V absolute maximum rating. Use Value: 33V VWM ensures no conduction during normal 12V bus operation; 58.1V VC stays within transceiver safe operating area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A | Same DO-214AC package; 33V VWM, 53.3V VC @ 9.8A; lower PPK (400W); no AEC-Q101 option | Not qualified for automotive under-hood use; suitable for industrial control panels with lower surge severity | Select SMAJ33A only if AEC-Q101 is not required and 400W surge margin suffices |
| P6SMB33AH | DO-214AA package; 33V VWM, 53.3V VC @ 9.8A; 600W PPK; AEC-Q101 qualified; higher IPPM (11.2A) | Larger footprint than DO-15; better thermal dissipation for repeated surge exposure | Choose P6SMB33AH when board space allows larger package and higher repetitive surge endurance is needed |
Compared with SMAJ33A and P6SMB33AH, the SA33CH offers identical VWM and tighter VBR tolerance (36.7–44.9V vs. ±5%), optimized DO-15 form factor for legacy automotive layouts, and guaranteed AEC-Q101 compliance without trade-offs in clamping performance.
Availability
SA33CH is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interface design, and LED lighting systems requiring stable component supply with long-term lifecycle assurance.
Supply support for SA33CH 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, rectifiers, and MOSFETs for automotive and industrial markets.
The SA Series was developed specifically for AEC-Q101-compliant transient suppression in 12V/24V automotive subsystems, emphasizing low clamping voltage, high surge robustness, and reliability under thermal cycling.
FAQ
What is the maximum clamping voltage of the SA33CH under full-rated surge conditions?
The SA33CH has a maximum clamping voltage (VC) of 58.1 V at 8.8 A peak pulse current (IPPM), corresponding to its 500W 10/1000μs surge rating. This value is measured per ANSI/IEEE C62.35 and ensures protected circuits remain below critical overvoltage thresholds during standardized transients such as ISO 7637-2 Pulse 5a. The SA33CH maintains this clamping performance across its full operating temperature range.
Is the SA33CH suitable for bidirectional transient suppression?
No, the SA33CH is a unidirectional TVS diode, indicated by the absence of "CA" or "C" suffix and confirmed by its single cathode band marking. It conducts only in reverse bias above VBR and must be oriented with cathode toward the protected line. For bidirectional protection, engineers should select SA33CH's counterpart SA33CA or SA33A - both explicitly rated for symmetrical clamping in either polarity.
Does the SA33CH meet automotive qualification standards?
Yes, the "H" suffix in SA33CH denotes AEC-Q101 qualification. This includes stress testing for high-temperature operating life, unbiased high-humidity bias, temperature cycling, and mechanical shock - all performed per the AEC-Q101-004 standard. The SA33CH is approved for use in automotive powertrain, chassis, and body electronics where reliability under extended thermal and vibration profiles is mandatory.
What is the junction capacitance of the SA33CH, and does it affect high-speed signal lines?
The SA33CH does not specify junction capacitance (CJ) in its official datasheet, and no typical CJ value is published by Taiwan Semiconductor for the SA series. As a power TVS optimized for bulk rail protection-not data-line ESD-it is not intended for placement directly on high-speed signal paths (e.g., USB, CAN FD). For such applications, dedicated low-capacitance TVS arrays like TPD4E001DPYR should be used instead of the SA33CH.
Can the SA33CH replace the SMAJ33A in an existing design without layout changes?
No - the SA33CH uses DO-204AC (DO-15) axial package, while SMAJ33A uses DO-214AC (SMA) surface-mount package. Their footprints, soldering methods, and thermal paths differ fundamentally. Direct replacement would require PCB redesign. However, the SA33CH's DO-15 form factor matches legacy through-hole designs where SMAJ33A cannot be substituted without mechanical revision.
SA33CH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- SA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 58.1V
- Current - Peak Pulse (10/1000µs):
- 8.8A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA33CH FAQ
1.How can I place an order for SA33CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA33CH 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 SA33CH reliable?
The price and inventory of SA33CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA33CH is usually 5 days.
3.What payment methods are accepted for SA33CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA33CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA33CH?
SA33CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA33CH 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 SA33CH?
For technical support, including SA33CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA33CH requirements.
6.How does Aetrix verify that SA33CH is sourced from the original manufacturer or authorized distributors?
All SA33CH 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 SA33CH meets industry standards.
7.What is the process for return or replacement of SA33CH?
All SA33CH units undergo pre-shipment inspection (PSI). If there is an issue with SA33CH, 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 SA33CH part is unused and in its original packaging.
Return procedure for SA33CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA33CH 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…
