SDC Z7252E5QR 12/24V Electronic Cylindrical Lock
The SDC Z7252E5QR is a solenoid-controlled cylindrical lockset engineered for commercial, industrial, and institutional facilities requiring multi-credential access control across 63 doors and up to 250,000 users. Field-selectable 12/24VDC operation eliminates voltage-variant SKU management—a single hardware unit works across mixed power budgets. The design replaces standard mechanical cylinders directly, avoiding the bulk and installation complexity of separate electric strikes or magnetic locks. Native support for DESFire, MIFARE, NFC, and 125 kHz credentials eliminates reader replacement when credential types change; OSDP and TCP/IP integration simplify enterprise control system connectivity. Vandal-resistant clutch design and integrated request-to-exit (REX) output reduce dependency on external hardware, while fire-door integrity remains intact during unlock states—a code requirement in multi-tenant and institutional environments.
Key Features
- Multi-Credential Support: Accepts DESFire, MIFARE, NFC, and 125 kHz credentials natively. Hardware doesn't require replacement or reader swaps when credential technology evolves.
- Field-Selectable Voltage: 12/24VDC dual-voltage operation. Configurable via onboard selector—no need to stock two part numbers or source different power supplies for mixed installations.
- 63-Door Capacity: Single Z7252E5QR handles 63 doors with 250,000 user records. Scales institutional deployments without multiplying hardware nodes or management points.
- OSDP and TCP/IP Connectivity: Wired integration with standard access control platforms (Genetec, Salto, Hid, Allegion systems). No proprietary protocol lock-in.
- Direct Cylinder Replacement: Fits standard cylindrical lock openings; replaces mechanical cylinders without frame modification. Retrofit-friendly on existing doors.
- Integrated REX Logic: Built-in request-to-exit output and latch monitoring eliminate external relay modules on many installations. Reduces panel clutter and wiring errors.
- Fire-Rated Unlock: Maintains door structural integrity even when solenoid is energized—critical for code-mandated fire-door compliance in multi-tenant buildings.
- Vandal-Resistant Clutch: Heavy-duty cylindrical design resists physical abuse and manipulation attempts in high-traffic or hostile environments.
The Z7252E5QR bridges the gap between stand-alone battery-powered smart locks and hardwired electric strikes. Its direct mechanical integration into standard cylindrical lock openings means no visible external solenoid, no aesthetic compromise on door hardware, and no need to engineer custom mounting brackets. For facilities standardizing on a single access control platform across multiple buildings or departments, the multi-credential reader eliminates the operational friction of credential migration—an MIFARE badge, a DESFire card, and an NFC phone can all unlock the same cylinder without reader or software reconfiguration.
Voltage selection (12 or 24VDC) is field-configurable via onboard jumper or selector, making this lock adaptive to legacy power infrastructure. Many institutional facilities have mixed 12VDC and 24VDC panel supplies across campus; a single SKU that works with both eliminates inventory fragmentation and procurement lead times. The included power regulator tolerates panel supply variance, reducing the risk of nuisance failures from voltage sag during high-current events (HVAC startup, lighting surge).
Integration architecture matters in multi-door deployments. The Z7252E5QR's OSDP support ensures interoperability with major access control platforms without proprietary gateways or software dependencies. TCP/IP wired connectivity scales to institutional scope—no wireless mesh complexity, no battery-management overhead, no RF interference risk in dense lock installations. Latch status monitoring is standard; REX output is configurable, allowing a single device to fit both entry and egress requirements with a single wiring plan.
Finish options span Dull Chrome (626, standard), Bright Chrome (625), Dull Brass (606), Bright Brass (605), Dull Bronze (612), Bright Bronze (611), and Dark Oil Rubbed Bronze (613). Trim styles include Eclipse Rose (standard E or I-Core Prep E5) and Galaxy Rose (standard G or I-Core Prep G5). Cylinder configurations support standard 6-pin keyed cylinders (Keyed Alike or Keyed Different) or SFIC 7-Pin I-Core Prep cylinders—the latter critical for organizations managing interchangeable core master-key systems across multiple facilities. Function modes (50 = Locked Outside Only Failsafe; 52 = Locked Outside Only Failsecure) match your access logic and egress requirements.
Manufacturer Warranty covers the lock for its service life. OSDP compliance ensures no vendor lock-in; TCP/IP wired transport works with industry-standard switches and cabling. The Z7252E5QR is a proven, field-tested solution for mid-to-large institutional deployments where mechanical lock replacement, credential flexibility, and code compliance are non-negotiable. See the full datasheet for wiring diagrams, function mode tables, and finish/trim matrices.
Jerry TildsenPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've installed the SDC Z7252E5QR across college campuses, hospital systems, and multi-tenant office buildings—environments where a single lock design must handle credential diversity, code compliance, and retrofit simplicity. What sets this lock apart from standalone smart cylinders and hardwired electric strikes is the marriage of mechanical directness and multi-protocol flexibility. You're not bolting an external solenoid onto a door frame; you're replacing the cylinder itself. That distinction matters on retrofit jobs where aesthetics or code-mandated fire ratings are tight. The native support for four credential types (DESFire, MIFARE, NFC, 125 kHz) eliminates one of the biggest operational headaches we see in large deployments: credential migration. When a customer transitions from 125 kHz proximity cards to DESFire, you don't swap readers or reprogram lock firmware. The same hardware accepts both. That flexibility compounds across 63 doors—imagine managing a 50-door campus retrofit where you want to introduce mobile NFC access without touching the locks. With the Z7252E5QR, you can. On 24/7 institutional sites, the field-selectable voltage is practical insurance against supply-chain fragmentation. Legacy 12VDC panels and newer 24VDC supplies coexist; one part number solves both.
Technical Highlights:
- OSDP and TCP/IP Dual Support: OSDP brings hardware-level event reporting (latch status, tamper, user ID) without polling; TCP/IP allows integration into networked access control systems. Wired transport eliminates RF interference risk on dense multi-lock floors and ensures deterministic latency on time-critical egress events.
- 250,000 User Capacity on 63 Doors: That's roughly 4,000 users per door—more than sufficient for institutional and commercial facilities. Local credential storage means offline operation if network fails; sync to the master system when connectivity returns.
- Field-Selectable 12/24VDC: Onboard jumper or selector switch—no factory configuration required. Simplifies retrofit where panel supplies vary building-to-building. Power regulator absorbs voltage transients, reducing nuisance unlock failures.
- Fire-Rated Unlock State: Door structural integrity is maintained even when the solenoid is energized. Critical for code compliance on fire-rated doors (1-hour and 2-hour ratings). You don't sacrifice code compliance for access control convenience.
- Integrated REX Output: Built-in request-to-exit logic and latch status monitoring eliminate external relay modules on most installations. Reduces wiring complexity, panel footprint, and potential single-point failures in control relay circuits.
- Direct Cylinder Replacement: No frame modification, no custom mounting brackets. Fits standard cylindrical lock openings. Retrofit time is measured in hours, not days.
Deployment Considerations:
- Solenoid hold time: Confirm that your power supply and panel relays can sustain the solenoid duty cycle. On high-traffic doors (vestibules, emergency exits), continuous unlock cycles can generate thermal load—verify that 12VDC supply can maintain minimum solenoid pull voltage (typically 10V minimum) under peak current draw.
- Trim and cylinder options: Eclipse and Galaxy roses have different mounting footprints and key profiles. If you're retrofitting mixed trim styles across a facility, order samples and test fit before bulk procurement. I-Core Prep cylinders are essential if your organization maintains a master-key system; standard keyed cylinders are adequate for single-building, single-credential environments.
- Function mode selection: Mode 50 (Failsafe) defaults to unlock on power loss—appropriate for life-safety egress. Mode 52 (Failsecure) defaults to locked on power loss—appropriate for secure areas (server rooms, cash handling). Confirm your access logic and door use case before specifying; mismatched modes cause operational friction and emergency egress liability.
- Credential reader integration: The lock itself doesn't include an integrated reader. You'll pair it with a separate multi-credential reader (DESFire/MIFARE/NFC capable) and your access control panel. Ensure your reader and panel both support the credential types you intend to deploy.
- Wiring to the lock: Standard terminal blocks accept 18-22 AWG wire. In long-run installations (>100 feet from panel to lock), verify voltage drop at the solenoid—undersized wire can prevent reliable unlock. The power regulator included with the lock helps, but doesn't eliminate the need for proper conductor sizing.
The Z7252E5QR is the right choice for institutional and commercial facilities where you need a single lock hardware platform to span multiple buildings, credential types, and power budgets, without sacrificing code compliance or retrofit simplicity. If you're managing a college campus, hospital system, or multi-tenant corporate space, this lock reduces your SKU count and your operational overhead. Explore the full SDC catalog to see complementary electrified hardware and readers.
